ONCOR INC
10-K405/A, 1998-05-22
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1


                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                               AMENDMENT NO. 1 TO
                                   FORM 10-K

                 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1997

                         COMMISSION FILE NUMBER 0-16177

                                   ONCOR, INC.
              ----------------------------------------------------
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                   <C>
                    MARYLAND                     52-1310084
           ------------------------   ------------------------------------
          (State of Incorporation)    (I.R.S. Employer Identification No.)
</TABLE>

                               209 PERRY PARKWAY
                          GAITHERSBURG, MARYLAND  20877
                   ------------------------------------------
                    (Address of principal executive offices)
                                   (Zip code)

                                 (301) 963-3500
               --------------------------------------------------
              (Registrant's telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:
                                      NONE

Securities registered pursuant to Section 12(g) of the Act:

                    Common Stock (Par Value $.01 Per Share)
                    ---------------------------------------
                                (Title of Class)

                   Redeemable Common Stock Purchase Warrants
                   -----------------------------------------
                                (Title of Class)

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.

                                YES  x   NO ____
                                    ----
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to
this Form 10-K. [x]

At February 28, 1998, there were 28,028,366 shares of Common Stock outstanding.
The aggregate market value of the voting stock held by non-affiliates was
approximately $115,576,825 at that date.  Document incorporated by reference:
Proxy Statement of Oncor, Inc.  relating to the Annual Meeting of Shareholders
to be held in June 1998, which is incorporated into Part III of this Form 10-K.





<PAGE>   2
                               TABLE OF CONTENTS

<TABLE>
<S>      <C>                                                                                                                 <C>
                                                               PART I

1.       Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1

2.       Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24

3.       Legal Proceedings  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24

4.       Submission of Matters to a Vote of Security Holders  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25

                                                               PART II

 5.      Market for Registrant's Common Equity
         and Related Stockholder Matters  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  26

  6.     Selected Consolidated Financial Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  27

  7.     Management's Discussion and Analysis
         of Financial Condition and Results of Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28

  8.     Consolidated Financial Statements and
         Supplementary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37

  9.     Changes in and Disagreements on Accounting
         and Financial Disclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  37

                                                               PART III

  10.    Directors and Executive Officers of the Registrant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42

  11.    Executive Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42

  12.    Security Ownership of Certain Beneficial Owners and Management . . . . . . . . . . . . . . . . . . . . . . . . . .  42

  13.    Certain Relationships and Related Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42


                                                               PART IV

  14.    Exhibits, Financial Statement Schedules,
         and Reports on Form 8-K  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  43

         Signatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  45
</TABLE>





<PAGE>   3
                                     PART I


ITEM 1.  BUSINESS

                                  THE COMPANY

         Oncor, Inc. ("Oncor") and together with its consolidated subsidiaries
(the "Company") was incorporated in Maryland in July, 1983.  Oncor's principal
offices are located at 209 Perry Parkway, Gaithersburg, Maryland 20877, and its
telephone number is (301) 963-3500.

                                    BUSINESS

         This Report contains certain statements of a forward-looking nature
relating to future events or the future financial performance of the Company.
Investors are cautioned that such statements are only predictions and that
actual events or results may differ materially.  In evaluating such statements,
investors should specifically consider the various factors identified in this
Report which could cause actual results to differ materially from those
indicated by such forward-looking statements, including the matters set forth
in "Business - Additional Risk Factors."

         The Company develops, produces and markets cancer-oriented genetic
probes, related reagents, molecular biology products, and diagnostic products.
The Company is conducting preclinical studies for detection tests for certain
leukemias, bladder cancer, lung cancer and certain blood cancers.  Oncor is
also developing or improving genetic test systems for the detection and
management of significant life-threatening cancers, including breast cancer,
bladder cancer, lung cancer and certain blood cancers.  In addition to its
genetic test systems, the Company currently manufactures and markets for
research purposes nearly 200 genetic probes to specific human genes, with
related reagents and instrumentation, and a wide array of molecular biology
products.  The Company currently sells its products to over 1,700 customers
worldwide.

         The Company is actively seeking the sale or other conveyance of its
two non-strategic business units - research products and non-oncology genetic
probe systems.  If either division is disposed of, the scope of the Company's
business, its number of products and number of customers will be reduced
significantly.  If both units are disposed of, its INFORM(TM) HER-2/neu
diagnostic test may be its sole remaining product presently marketed to North
America, which currently is sold to a limited number of customers.  The Company
expects that the disposal of each of these units will result in a significant
decrease in the number of employees in the Company, through assimilation by the
acquiring entity or by termination.  All information provided in this Business
section should be read in conjunction with these plans.





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<PAGE>   4
         In February 1994, the Company filed a Premarket Approval ("PMA")
application with the United States Food and Drug Administration (the "FDA") for
its Her-2/neu amplification test system for the characterization of breast
cancer prognosis.  In November 1996, the Company underwent a successful FDA
inspection for the conduct of its clinical trials for the INFORM(TM) HER-2/neu
test.  In June 1997, the Company completed clinical, reproducibility and
training requirements requested by FDA and submitted the results of the studies
to the FDA.  Additionally in June 1997, FDA completed its pre-PMA inspection of
the Company's manufacturing and quality systems.  Based on the results of the
inspection, the PMA was recommended for approval by the Inspection District
Office.  In December 1997, the PMA for the Oncor INFORM(TM) HER-2/neu Gene
Detection System was approved for marketing by FDA.  The product was launched
within 30 days of approval following submission of copies of the final labeling
to the FDA.  There can be no assurance that the Company will be capable of
manufacturing the test system in commercial quantities at reasonable costs or
marketing the product successfully, that the test system will be accepted by
the medical diagnostic community, or that the market demand for the test system
will be sufficient to allow profitable sales.

         Oncor's genetic test systems permit the detection of individual cancer
cells at the fundamental genetic level, as distinct from conventional forms of
analysis which detect the large cancer cell populations that result from the
progression of the disease.  In addition, genetic test systems can be used to
characterize a cancer cell's origin or type, thereby facilitating the selection
of the appropriate treatment modality.  As a result, Oncor's genetic test
systems may be useful throughout the cycle of cancer management from initial
screening for predisposition to cancer, through detection and typing of cancer
and selection of therapy, to monitoring of treatment and detection of residual
disease or relapse.

         The Company has established agreements with numerous academic and
research institutions which provide (or have provided) the Company with certain
exclusive commercial rights to inventions relating to specific genes and other
genetic technologies.  These institutions include The Johns Hopkins University
School of Medicine ("Johns Hopkins"), University of Chicago, The Children's
Hospital of Philadelphia, Yale University, the Massachusetts General Hospital,
University of Utah and Princeton University.

         The Company is currently evaluating its institutional agreements with
a view toward significantly reducing the expenses associated with maintaining
them.  Accordingly, management expects that the number and scope of these
agreements will be reduced significantly in the near future, consistent with
the terms of each such agreement.

PRODUCTS

         The Company's principal products include:  (1) the INFORM(TM)
HER-2/neu Gene Detection System for the prognosis of breast cancer, (2)
integrated research genetic test systems containing one or more genetic probes
(also sold separately) together with the reagents, slides and other materials
necessary to perform genetic analysis, and (3) molecular biology reagents,
enzymes and instruments for the research market.  The Company also sells





                                       2
<PAGE>   5
the individual genetic test system components as required by its customers.
The Company's genetic test systems generally incorporate in situ hybridization
techniques.  Enhancing the speed and reliability of these techniques and
developing novel succeeding technologies have been major focuses of the
Company.

         The Company's FDA approved product is marketed worldwide for in vitro
diagnostic use.  However, the majority of the Company's products are currently
sold for research purposes only and, accordingly, do not require approval or
clearance by the FDA or by any similar foreign authority.  However, the Company
plans to obtain FDA approval or clearance for the clinical use of a number of
these products.  No assurance can be given that the Company will obtain FDA
approval for any of its products or that the FDA will continue to allow
widespread marketing of research products without certification.

         In July 1996, the Company announced a plan to discontinue or suspend
the development, manufacture and marketing of certain products in certain
geographic regions in which net margins for these products in these regions
historically have been low.  Such products and regions included the entire
biological imaging product line and much of the products developed and
manufactured by Appligene S.A., the Company's European operating subsidiary
("Appligene") as they relate to sale in the United States.  In addition, the
Company has suspended the manufacture and marketing of its B/T Blue Gene
Rearrangement Test System (B/T Blue) in order to complete the reconfiguration
of the product and the submission of the required documentation with the FDA.
The Company has also constructively withdrawn its current PMA filing at the FDA
for its leukemia detection test for Chronic Myelogenous Leukemia ("CML") and
its test system for the detection of certain strains of Human Papilloma Virus
("HPV"), in order to (i) respond to requests and questions provided by the FDA
and (ii) consider the possible reconfiguration of the test system and
resubmission of a PMA or alternate regulatory pathway for marketing.  With
respect to the B/T Blue, CML, and HPV test systems, the Company cannot predict
when or if it will complete these reconfigurations and submissions, or that, if
such submissions would receive FDA approval on a timely basis, if at all.

         Through its in-house research and development efforts, along with
collaborations with human genome research centers, Oncor has assembled, and is
developing, a portfolio of genetic test systems and enabling technologies.  Set
forth below are descriptions of the Company's principal genetic test systems
and related products currently being sold or under development.

         Breast Cancer

         The Company has developed a genetic test system to identify Her-2/neu
gene amplification, an independent marker of breast cancer aggressiveness.  The
Company believes the presence of Her-2/neu amplification is indicative of
clinically aggressive breast cancer, even in apparent localized tumors,
predicting which tumors may recur.





                                       3
<PAGE>   6
         The Company completed clinical trials of its Her-2/neu amplification
test system for breast cancer and filed a PMA application in February 1994.  In
November 1996, the Company underwent a successful FDA inspection of the conduct
of its clinical trials for the INFORM(TM) HER-2/neu test.  In June 1997, the
Company completed clinical, reproducibility and training requirements requested
by FDA and submitted the results of the studies to the FDA.  Additionally in
June 1997, FDA completed its pre-PMA inspection of the Company's manufacturing
and quality systems.  Based on the results of the inspection, the PMA was
recommended for approval by the Inspection District Office.  In December 1997,
the PMA for the Oncor INFORM(TM) HER-2/neu Gene Detection System was approved
for marketing by FDA.  The product was launched within 30 days of approval
following submission of copies of the final labeling to the FDA.  There can be
no assurance that the Company will be capable of manufacturing the test system
in commercial quantities at reasonable costs or marketing the product
successfully, that the test system will be accepted by the medical diagnostic
community, or that the market demand for the test system will be sufficient to
allow profitable sales.  The Company also has approval to market its INFORM(TM)
Her-2/neu genetic test system for diagnostic use in Australia, Austria, Canada,
Denmark, Germany, Ireland, Luxembourg, The Netherlands, Sweden, Switzerland and
the United Kingdom and commenced marketing for diagnostic purposes in these
countries in 1997.

         In 1997, the Company terminated an exclusive world-wide license and a
sponsored research agreement with Tel Aviv University's Sackler School of
Medicine ("Sackler") with respect to the development of methods for the
detection of minute quantities of p43 antigen in human blood, once considered
to be a breast cancer marker.

         Cervical Cancer

         The Company has developed a test system for the detection of certain
strains of Human Papilloma Virus ("HPV") in cervical tissue samples.  Such
strains of HPV are widely believed to be linked to the onset of cervical
cancer.  The Company filed a PMA application with and received a letter of
approvability from the FDA with respect to the test system, with final approval
dependent upon completion of a pre-approval inspection and submission of final
labeling within 180 days of the letter.  The Company thereafter has
reconfigured the test system to facilitate automation and integration of the
test with automated Pap Smear testing.  Pursuant to this reconfiguration, the
PMA application on file with FDA is considered to have been constructively
withdrawn until at which time the Company conducts, among other things,
additional clinical trials and refiles the PMA application with the additional
information.  The Company currently is seeking to establish a cooperative
arrangement with one or more companies involved in providing the capability for
automated Pap Smear testing.  There can be no assurance that such PMA will be
filed on a timely basis, if at all, or if so filed, will be approved by the FDA
on a timely basis, if at all.  Furthermore, there can be no assurance that the
Company will be successful in securing a cooperative arrangement with respect
to the further development, testing and filing requirements for the test.  The
Company believes that it could not successfully undertake development of an
automated and integrated HPV test system in the absence of such a cooperative
agreement.





                                       4
<PAGE>   7
         Bladder Cancer

         The Company has acquired exclusive rights to certain published
technologies from Johns Hopkins which the Company believes may be beneficial in
developing a bladder cancer screening test.  Johns Hopkins has filed U.S. and
foreign patent applications relating to this technology.  There can be no
assurance that patents will issue as a result of any such pending applications
or that, if issued, such patents will be sufficiently broad to afford
protection against competitors with similar technology.  In addition, there can
be no assurance that any patents issued to the Company, or for which the
Company has license rights, will not be challenged, invalidated or
circumvented, or that the rights granted thereunder will provide competitive
advantages to the Company.  Plans are in progress to incorporate these
technologies into preclinical and clinical trials, and a 4-site pre-clinical
trial has begun to provide additional validation data for this assay approach.

         Lung Cancer

         The Company and Johns Hopkins are actively pursuing the discovery of
genetic changes associated with the early detection of lung cancer under a
collaboration research and licensing agreement.  The objective is the
development of a method to detect the associated specific genetic events in
sputum samples at an early stage.  In October 1996 and March 1998, U.S. Patent
Nos. 5,561,041 and 5,726,019, respectively, were issued to Johns Hopkins which
relate to this technology, which is licensed exclusively to the Company.  In
September 1997, the Company received a $100,000 SBIR grant from the National
Cancer Institute to conduct feasibility studies on a unique approach to
detection of rare cancer cells containing point mutations in the ras or p53
genes.  Successful completion of this work in 1998 will be required for
commercialization of this test for early detection of lung cancer.  There are
no assurances that this development work will result in a product at this time.

         Breast, Prostate and Colon Cancer -- Molecular Staging Assay

         In March 1994, the Company acquired an exclusive worldwide license
from Johns Hopkins for a test that will detect small numbers of metastatic
cancer cells in surgical sections and lymph nodes.  Johns Hopkins has filed
U.S. and foreign patent applications for this technology.  There can be no
assurance that patents will issue as a result of any such pending applications
or that, if issued, such patents will be sufficiently broad to afford
protection against competitors with similar technology.  In addition, there can
be no assurance that any patents issued to the Company, or for which the
Company has license rights, will not be challenged, invalidated or
circumvented, or that the rights granted thereunder will provide competitive
advantages to the Company.  The test is more sensitive than current methods and
could have broad-based implications in the staging and management of all solid
tumors.  The test is being offered for clinical service by Oncormed, Inc.
("Oncormed"), the Company's medical services affiliate, for application in the
detection and management of breast, colon and prostate cancers.





                                       5
<PAGE>   8
         TriAmp(TM) Amplification Technology

         The Company has developed a proprietary technology for the targeted
amplification of DNA sequences.  A U.S. patent relating to the technology was
issued in January 1997.  The Company is a party to an interference proceeding
declared by the PTO involving Beckman Instruments, Inc.'s ("Beckman") and the
Company's claims regarding that application.  There can be no assurance as to
the length of time for a decision to be rendered, or the nature of the
decision, in this interference proceeding or any potential appeal therefrom.
If it is determined that Beckman's patent claims have priority over the
Company's claims, the Company may have no patent claim or protection with
respect to the Company's TRI-AMP(TM) technology, which could prevent or limit
the Company's ability to commercialize the Company's TRI-AMP(TM) technology,
absent a license from Beckman.  The Company has chosen not to contest priority
in the interference.

         Sunrise Primers and Rolling Circle Amplification

         The Company has developed a family of proprietary technologies for the
direct, quantitative analysis of nucleic acid amplification reactions.  Certain
of these technologies permit real-time quantitation of nucleic acid
amplification techniques in a closed-tube format without the need for any
post-amplification steps.  Oncor announced a licensing agreement in October
1997 with R&D Systems which will enable them to distribute Oncor's Sunrise(TM)
technology in kits to measure cytokine mRNA.  Another agreement was signed with
Becton Dickinson in March 1998, for the use of Sunrise(TM) technology in their
diagnostic products.  On March 16, 1998, Oncor announced it had secured certain
rights to a novel amplification technology called Rolling Circle Amplification
Technology ("RCAT") from Yale University in the fields of cancer, infectious
disease, molecular genotyping and pharmacogenetics for diagnostic purposes.
Oncor will also participate in a three-member limited liability company along
with Yale and Molecular Staging, Inc. to further commercialize RCAT through
sublicenses.  Several U.S. patent applications relating to the technologies are
pending.  In 1997, the Company received two SBIR grants from the NIH to support
further development of the Sunrise(TM) technology and the RCAT.

         Methylation

         The Company has licensed exclusively from Johns Hopkins a proprietary
technology for determining the methylation status of specific genes.  A U.S.
patent application relating to the technology is pending and has been allowed.
The expression of certain cancer related genes, including certain tumor
suppressor genes and cell life cycle genes, is known to be influenced by the
methylation status of certain regions within the genes.  Oncor began marketing,
for research use only, kits to measure methylation status early in 1997.





                                       6
<PAGE>   9
         Other Products

         In addition to the genetic test systems for specific cancers and
genetic diseases, the Company currently manufactures and sells nearly 200 other
genetic probes to specific regions (chromosomes, loci or genes) for research
purposes.  In addition to genetic probes, the Company manufactures and markets
for research purposes reagents and solutions for use in hybridization
procedures, reagents for the extraction of DNA samples from blood and solid
tissue, as well as various DNA labeling kits.  There is no assurance that the
FDA will allow continued marketing of research use products except to certified
research parties.


ONCORMED

         As more fully described in Note 5 to the accompanying consolidated
financial statements, Oncormed, the Company's medical services affiliate, has
completed two public offerings of its common stock, first in October 1994, then
in February 1996.  As a result, the Company's ownership interest was reduced to
approximately 40% of the outstanding common stock in 1994 and 29% in 1996.  In
February 1997, Oncormed was granted a non-exclusive license in exchange for
approximately 0.7 million shares of stock, and the Company's ownership interest
was subsequently reduced to 25%.  Accordingly, Oncormed is no longer a
consolidated subsidiary of the Company.  Oncormed continues to develop its
genetic risk assessment, early cancer detection and other genetic services
around technologies developed by Oncormed or licensed from others, including
Oncor.

CODON (FORMERLY KNOWN AS ONCORPHARM)

         As more fully described in Note 5 to the accompanying consolidated
financial statements, Codon Pharmaceuticals, Inc.  ("Codon") (formerly known as
OncorPharm, Inc.), the Company's therapeutic affiliate, completed rounds of
private equity financing in April 1995 and in April 1996.  As a result,
beginning in 1996, the Company's ownership interest was reduced to
approximately 42% of Codon's outstanding capital stock and remained at that
level throughout 1997.  Accordingly, for the fiscal periods presented in the
accompanying financial statements, Codon was not a consolidated subsidiary of
the Company.  Codon is undertaking research activities in an effort to develop
gene-repair compounds and other genetic therapies, based on technologies
acquired, directly or indirectly, by exclusive license from Princeton
University, Yale University and Johns Hopkins.

         Effective February 28, 1998, the Company exchanged approximately 1.65
million shares of its common stock for all the outstanding shares of Codon not
held by the Company.  The effect of this transaction was to increase the
Company's ownership of Codon to 100%.  This transaction has been accounted for
as a purchase.  Of the purchase price of approximately $6.2 million, $5.7
million has been allocated to research and development projects in process and
expensed in the first quarter of 1998.  As a result of this transaction, all of
Codon's operating expenses and losses have been and will continue to be
included in the operating results of the Company from the effective date of the
acquisition.  The





                                       7
<PAGE>   10
Company henceforth will include in its consolidated cash position any amounts
raised through the separate financing activities of Codon.

APPLIGene

         In September 1994, the Company acquired substantially all of the
outstanding capital stock of Appligene.  In July 1996, Appligene completed an
initial public offering of its common stock in France, thereby reducing the
Company's ownership interest to approximately 80%.  Appligene develops,
manufactures and markets a variety of molecular biology products, most
significantly restriction enzymes, and markets related apparatus and equipment.
The principal markets for Appligene's products are in Europe, including the
United Kingdom.  Oncor markets its products for research and diagnostic
purposes in Europe through Appligene's direct sales force and distributors.

RESEARCH AND DEVELOPMENT

         The Company conducts the majority of its research and development
activities through its own staff and facilities.  As of May 1, 1998, the
Company had 31 employees engaged in research and development, including 29 with
Ph.D.'s.  The Company's in-house research and development efforts are focused
primarily on the development of new genetic test systems, new genetic probes,
probe labeling and detection techniques, reagent chemistries,  sequencing
products, amplification methods and cellular rare event detection.

         In addition to its in-house research programs, the Company
collaborates with academic and research institutions to support research in
areas of interest to the Company.  In particular, all of the clinical testing
required to support the Company's FDA approval applications are conducted by
outside clinical research institutions. Typically under these arrangements, the
Company's personnel in conjunction with consultants to the Company establish a
clinical testing protocol, monitor the performance of the institution in
implementing that protocol and, if necessary, prepare the associated
documentation, statistical analysis and submission of results to the FDA.  The
Company usually pays the costs of the outside institution associated with
conducting and reporting the results of the clinical trials.

         In addition, the Company occasionally licenses from third parties the
rights to certain genetic probes and other technologies that it incorporates in
its products or uses in its research and development efforts.  See "Business --
Proprietary Rights and Licenses."

SALES AND MARKETING

         The Company has direct sales forces in Europe and the United States,
aggregating approximately 25 employees as of May 1, 1998, and is supported by
field application specialists and in-house technical services personnel.  The
Company currently markets its products through its sales forces to over 1,700
customers in the United States and Europe, to clinical and research
laboratories for research purposes.  These customers include laboratory
directors at centers that analyze tumors, genetic laboratories that perform
chromosomal





                                       8
<PAGE>   11
analysis and academic research laboratories.  In other regions of the world,
the Company sells its products through research product distributors.  The list
prices of the Company's genetic test systems range from approximately $15 to
$110 per test.  The tests are typically purchased on a recurring basis.

         The Company emphasizes the sale of integrated genetic test systems
composed of genetic probes, slides, reagents and other materials to help assure
the performance of the products in the customer's laboratory.  In addition, the
Company operates periodic workshops in which clinicians pay tuition to receive
training in the use of the Company's products for the research analysis of
cancer and genetic diseases.

         The marketing plan for the INFORM(TM) HER-2/neu Gene Detection System
includes convincing medical oncologists, surgical oncologists, pathologists and
patients of the value of the Company's FDA approved assay.

         The Company's strategy to create demand focused on clear promotion of
INFORM(TM) through direct sales contact by the Company's sales representatives,
advertising in key oncology and pathology journals and consumer periodicals,
establishing standardization with large oncology groups, and working with
breast cancer advocacy groups.  The Company's web site acts as a source of
information and direction 24 hours a day.

         The Company has a number of ongoing discussions with oncology
cooperative groups, individual investigators, major reference labs and
pharmaceutical companies on clinical studies planned to investigate the further
clinical utility of INFORM(TM).

         The Company has added both reimbursement and clinical expertise to its
marketing plan with the addition of Comprehensive Reimbursement Consultants and
Ask the Pharmacist, Inc.  These two organizations are extending the Company's
reach to help its customers more readily use INFORM(TM) on a regular basis.
The Company is planning to extend its marketing reach with co-marketing efforts
from other aligned diagnostic and oncology focused companies.

         The Company will be present with INFORM(TM) at all the major U.S.
oncology trade shows to demonstrate its commitment to provide exposure, support
and education to the Company's key customers.

         In the U.S., the Company presently has 11 sales representatives and
several marketing personnel supporting the launch and commercialization of
INFORM(TM).  These sales representatives are also in a position to expand the
present usage of the Company's existing oncology genetic line with these same
key customers.

MANUFACTURING

         The Company currently operates two manufacturing facilities.  One is
co-located with its headquarters in Gaithersburg, Maryland, for the production
of commercial quantities of its





                                       9
<PAGE>   12
genetic test systems and reagents.  The second facility is located in
Strasbourg, France for the production of molecular biology products.  The
Company maintains its own quality control laboratories at both sites to assure
quality and product performance.

COMPETITION

         Competition in the medical diagnostic and research market is intense.
The Company competes with a large number of companies ranging from very small
businesses to large diagnostic, health care, pharmaceutical, biotechnology and
chemical companies, many of which have substantially greater financial,
manufacturing, marketing and product research resources than the Company.
Academic institutions, governmental agencies and other public and private
research organizations are also conducting research activities and may
commercialize products on their own or through joint ventures with competitors.
In general, the particular companies with which the Company competes and the
technologies with which its products compete vary with the Company's different
products and markets.  The Company competes primarily on the basis of the
clinical utility, accuracy, speed, ease of use and other performance
characteristics of its products and, to a lesser degree, on the price of its
products.

         The largest portion of the cancer diagnostics market to date has been
represented by serum protein assays, which measure the actual amount of the
specific target protein in the blood.  Serum assays are recommended primarily
for the monitoring of patients with known disease.  In addition to protein
assays, a number of companies supply antibodies to various cell surface
proteins associated with cancer.  Antibody-based cancer diagnostics are also
utilized in conjunction with flow cytometry instrumentation.

         The Company is also aware that other companies are likely  developing
genetic test systems for diagnostic purposes, which may be competitive with the
Company's existing products and those under development.  In addition, a number
of methods currently exist for gene amplification, including the widely used
polymerase chain reaction ("PCR") process, and the Company is aware that
additional methods are under development by other companies.  These gene
amplification methods could compete directly with the Company's amplification
product line.  The existence of these and other competing products or
procedures that may be developed in the future may adversely affect the
marketability of products developed by the Company.

         Competition for molecular biology products is intense both in the
United States and Europe, primarily from very large multi-national
corporations.

         The Company's competitive position depends, in part, on its ability to
attract and retain qualified scientific and other personnel, develop effective
proprietary products, implement production and marketing plans, obtain patent
or exclusive licensing protection and obtain adequate capital resources.





                                       10
<PAGE>   13
GOVERNMENT REGULATION

         Those of the Company's products that are intended for research
purposes only, as opposed to clinical diagnostic applications, and which are
labeled and sold as such, may currently be marketed in the United States and
most foreign markets.  However, the manufacture, distribution and sale of the
Company's products in the United States for clinical diagnostic purposes
requires prior authorization by the FDA.  The FDA and similar agencies in
foreign countries, especially France and Japan, have promulgated substantial
regulations which apply to the testing, marketing, import, export and
manufacturing of diagnostic products.  In order to obtain FDA approval
(marketing clearance) of a new product for diagnostic purposes, the Company
will be required to submit evidence of the safety and efficacy of the product.
Alternatively, the Company could pursue FDA Pre-Market Notification (510(k)
application) for selected products, requiring that the Company submit evidence
of substantial equivalence to previously marketed products.  Both types of
submissions typically entail providing evidence established through extensive
clinical and laboratory tests and demonstrations of compliance with FDA Good
Manufacturing Practices ("GMP") regulations.  The testing, preparation of
necessary applications and response to the FDA in their processing of those
applications is expensive and time consuming.

         The clinical testing required of the Company's products is expected to
be significantly less extensive than that typically required for a therapeutic
product.  Nevertheless, these clinical testing protocols may take several
months or years to complete, depending on the nature of the filing.  There can
be no assurance that the FDA will act favorably or quickly in making its
reviews, and significant difficulties or costs may be encountered by the
Company in its efforts to obtain FDA approvals that could delay or preclude the
Company from marketing its products for diagnostic purposes.  Furthermore,
there can be no assurance that the FDA will not request the development of
additional data following the original submission.  Based upon the data
submitted to it, the FDA may also limit the scope of the labelling, permitted
use of the product or deny the application altogether.  With respect to
patented products or technologies, delays imposed by the governmental approval
process may materially reduce the period during which the Company will have the
exclusive right to exploit those products or technologies.

         The Company's diagnostic products, as presently contemplated, will be
regulated as medical devices.  Prior to entering commercial distribution, all
of the Company's diagnostic products must undergo FDA review under one of two
basic review procedures: a Section 510(k) premarket notification ("510(k)") or
PMA application.

         After product approvals have been received, they may still be
withdrawn by the FDA if compliance with regulatory standards is not maintained
or if substantial problems occur after the product reaches the market.  The FDA
may require post-marketing surveillance programs to monitor products which have
been commercialized, and has the power to prevent or limit further marketing of
the products based on the results of these post-marketing programs.  In
addition, prior to obtaining FDA marketing approval or clearance for each
product and, on a continuing basis, the FDA must, under the Food, Drug





                                       11
<PAGE>   14
and Cosmetic Act, inspect the manufacturing facilities and procedures for
compliance with its GMP regulations.

         Effective in November 1998, a third method for marketing, specifically
via Analyte Specific Reagents ("ASRs"), will be available to FDA regulated in
vitro diagnostic companies.  ASRs do not require a submission to FDA prior to
marketing, however, they do require compliance with FDA current Good
Manufacturing Practices along with other specified labeling restrictions and
reporting requirements.  Some of the Company's products may qualify for
marketing as ASRs.

         Sales of the Company's products outside the United States are also
subject to extensive regulatory requirements, which vary widely from country to
country.  Diagnostic products that have not been approved by the FDA may be
exported for sale outside the United States only after meeting specific
conditions for export set forth by the FDA.  Furthermore, such products may be
exported for use only in certain countries, generally countries within Europe,
Canada, Australia and Japan, and, then, only if the appropriate regulatory
authorities in such countries have approved such products for use in their
respective countries.  The time required to obtain such approval may be longer
or shorter than that required for FDA approval.  To date, the Company has
received export approval from the FDA and import approval from the appropriate
foreign regulatory bodies to market the Company's breast cancer test in
Australia, Austria, Canada, Denmark, Germany, Ireland, Luxembourg, The
Netherlands, Sweden, Switzerland and the United Kingdom.

         The Company's products that are being sold for research purposes only
are properly labeled as such, as required by the FDA.  The FDA imposes
distribution requirements and procedures for companies selling "research use
only" and "investigational use only" labeled products and requires that the
seller label the products appropriately and establish that the products are
being used as labeled.  As a result of these requirements, the Company's
products can only be sold in the United States to a limited number of customers
for limited use and cannot be sold for broader commercial use without future
FDA approval.  No assurance can be given that the Company will receive FDA
approval for any of its products or that it will be able to sell its approved
products in larger quantities.

         Any change in governmental regulations or in the interpretation
thereof could have a material adverse effect on the Company.  The Company is
subject to regulation by other agencies in addition to the FDA, including the
Environmental Protection Agency, the Occupational Safety and Health
Administration, the Nuclear Regulatory Commission and the equivalent state and
local regulatory agencies.  The Company believes that it is in compliance with
the regulations of such agencies.





                                       12
<PAGE>   15
PROPRIETARY RIGHTS AND LICENSES

         The Company relies on patent rights, trade secrets, trademarks, and
nondisclosure agreements to establish and protect its proprietary rights in its
technologies and products.  Despite these precautions, it may be possible for
unauthorized third parties to utilize the Company's technology or to obtain and
use information that the Company regards as proprietary.  The laws of some
foreign countries do not protect the Company's proprietary rights in its
processes and products to the same extent as do the laws of the United States.

         The Company has filed patent applications seeking patent protection
for certain of its products.  Currently, the Company owns six issued U.S.
patents and numerous U.S. patents or patent applications are issued or pending
for inventions owned by or licensed to the Company.  In addition, numerous
foreign patent applications or patents corresponding to these U.S. patents or
patent applications are pending.  The Company's owned or licensed issued U.S.
patents have terms which are for the greater of seventeen years from grant, or
twenty years from filing, and expire between 2007 and 2015.

         Two of the patents, issued June 6, 1995 and December 2, 1997 and
licensed exclusively to the Company by Princeton University, relate to methods
for the formation of triple stranded nucleic acids.  One of the U.S. patents
owned by the Company relates to the Company's PROBE TECHTM technology for
Southern analysis of DNA.  The second and third U.S. patents relate to one of
the Company's DNA amplification technologies.  Foreign patent applications
relating to this technology are pending in Europe, Canada and Japan.  The
fourth U.S. patent is related to the Company's TRI-AMP(TM) DNA amplification
technology.  The fifth U.S. patent relates to novel labelled nucleotides
developed by the Company, and the sixth U.S. patent relates to an aspect of the
Company's mutation detection technology.  One of the Company's U.S. patent
applications relates to the detection of bladder cancer and two U.S. patent
applications relate to the isolation of fetal cells from maternal circulation.
One pending U.S. patent application and applications pending in Europe, Japan
and Canada relate to TRI-AMP(TM) enzymatic amplification of nucleic acid
sequences technology.  Other patent applications relate to certain aspects of
the Company's genetic probes and reagents, certain aspects of the technology
enabling its in situ hybridization chemistry, certain aspects of enhancing
fluorescent signals and detecting amplification products.  In addition, Codon
has pending patent applications which relate to various aspects of its gene
repair technology, oligonucleotide analogs and small molecule pharmaceuticals.
There can be no assurance that the United States Patent and Trademark Office
(the "PTO") or foreign patent offices will grant patent protection for the
subject matter of any of these patent applications.

         The Company has licensed rights to inventions disclosed in United
States and foreign patent applications relating to methods and probes for
detecting the presence of the Fragile X syndrome.  The Company believes that
its licensors are original inventors and are entitled to patent protection in
the United States, but the Company is aware that two other parties also have
filed patent applications in the United States and abroad and claim to be
entitled to patents related to this technology.  The Company had initiated an
interference proceeding with these third parties in the PTO to resolve which
party is entitled to a U.S.  patent, if any.





                                       13
<PAGE>   16
The application licensed by the Company was senior in the interference.  An
unfavorable decision in such a proceeding could have an adverse effect on the
Company.  The Company has settled the interference with respect to both
parties.

         The Company relies substantially on certain technologies which are not
patentable or proprietary and are therefore available to the Company's
competitors.  In addition, many of the processes and much of the know-how of
importance to the Company's technology are dependent upon the skills, knowledge
and experience of its scientific and technical personnel, which skills,
knowledge and experience are not patentable.  To protect its rights in these
areas, the Company requires all employees, significant consultants and
advisors, and collaborators to enter into confidentiality agreements.  There
can be no assurance however, that these agreements will provide meaningful
protection for the Company's trade secrets, know-how or other proprietary
information in the event of any unauthorized use or disclosure of such trade
secrets, know-how or proprietary information.  Further, in the absence of
patent protection, the Company may be exposed to competitors who independently
develop substantially equivalent technology or otherwise gain access to the
Company's trade secrets, knowledge or other proprietary information.

         ONCOR(R), HYBRISOL(R), SURE BLOT(R), COATASOME(R), APOPTAG(R),
FIDELITY(R),FLUOR-AMP(R), QUINT-ESSENTIAL(R), TRAPEZE(R) and the ONCOR Man
Design are registered trademarks of the Company.  In addition to these
trademarks, the Company is currently using the unregistered trademarks
OPTICYTE(TM), BLOCKIT(TM), HYB-BATH(TM), B/T BLUE(TM), EX-WAX(TM), RNA PREP(TM),
TEMPLATE-TAMER(TM), ONCOR ARCHIVE(TM), INFORM(TM) APOPNEXIN(TM), APOPTEST(TM),
D-FISH(TM), S-FISH(TM), and SUNRISE(TM), and has applied for the registration
of the latter six marks.  The Company has filed applications to register
CpGWIZ(TM), GREEN CAP(TM), GREEN COAT(TM), RCA(TM), RED CAP(TM), RED COATTM,
ROLLING CIRCLE AMPLIFICATION(TM) and TRI-AMP(TM), which the Company intends to
use as trademarks.  Also, Codon has filed an application for CODON(TM), which
it intends to use as a trademark.  The Company's trademark registrations have
ten year terms and are renewable for additional ten year terms for as long as
the Company is using the registered trademark.

         The number of patents and trademarks practiced by the Company will be
substantially reduced if the Company is successful in disposing of either or
both of its non-strategic business units.

         The Company has pursued a strategy of selectively licensing patents
and technologies from third parties to accelerate the introduction of new
products and to provide access to patented technologies and genetic probes.  In
some cases, the Company has assumed the prosecution of patent applications
relating to the technology subject to these licenses.  The Company's license
agreements typically have a term equal to the term of the underlying patent or
patents, or, in certain instances, six to ten years after the first commercial
sale of a product developed from the licensed technology.





                                       14
<PAGE>   17
EMPLOYEES

         The Company had 161 employees at May 1, 1998, including 32 employees
in research, clinical and related laboratory personnel; 58 employees in sales
and marketing; and 71 employees in administration, finance, regulatory affairs,
production and distribution.  Of these employees, 68 resided and worked in
Europe as of such date.  Of the 32 laboratory employees, 29 have Ph.D.'s.  The
future success of the Company will depend in large part upon its continued
ability to attract and retain highly skilled and qualified personnel.
Competition for such personnel is intense.  None of the Company's U.S.
employees is represented by a labor union.  The Company has experienced no work
stoppages and believes that its relations with its employees are excellent.

         As noted above, the number of employees in each category will be
substantially reduced if the Company is successful in disposing of either or
both of its two non-strategic business units.

ADDITIONAL RISK FACTORS

         History of Operating Losses

         Oncor has not been profitable since its inception in July 1983.  For
the quarter ended March 31, 1998, the Company incurred net losses of
approximately $12.3 million and as of that date, the accumulated deficit of the
Company was $145.3 million.  The Company expects to incur additional losses in
future periods.  The Company believes it will become profitable sometime in
1999 but cannot provide assurance as to when, if ever, it will achieve
profitability.

         Additional Financing Requirements and Access to Capital Funding

         The Company expects that its current liquid resources will not be
sufficient to fund operations after the end of May 1998.  Funds, if any, raised
from most of the possible sources during the intervening period must first be
utilized to repay, in whole or in part, the Company's bank debt of $3.5 million
in accordance with the terms of the underlying line of credit and related
guarantees. In April 1998, the Company increased its secured line of credit from
$3.0 million to $3.5 million, which the Company has fully drawn down. The line
of credit, which expires on October 31, 1998, is guaranteed by certain
shareholders whose guarantees are secured by substantially all of the assets of
the Company.

         The Company is considering alternative forms of financing, including
among other things, equity or debt financing, sale of certain non-strategic
assets, including the Research Products Division and the Company's interests in
certain other affiliates, as well as the sale of other assets which may result
from the previously announced retention of Lehman Brothers by the Company to
explore strategic alternatives to increase stockholder value, including sale of
the Company, sale of publicly-traded Oncormed common stock, third party funding
of Codon for future cash requirements and recovery of Oncor advances to Codon
and other alternatives.





                                       15
<PAGE>   18
         There can be no assurance that any of the alternatives discussed
above, or any other forms of financing, can be completed by the Company in
sufficient amounts, in timely fashion, on acceptable terms, or at all, which
would have a material adverse effect on the Company.  Even if completed, each
of such financing alternatives may have certain terms, conditions or
ramifications which may have a material adverse effect on the Company's
business, financial condition and results of operations.  For instance, any
such equity financings likely will be dilutive to stock holders, the terms of
any debt financing, as does the existing line of credit, may require
substantially all of the assets of the Company to be pledged as collateral, may
involve warrant or equity dilution and/or may contain restrictive covenants
which limit the Company's ability to pursue certain courses of action, and the
sale of assets will decrease the revenue base of the Company.

         While the Company is using its best efforts to consummate one or more
of these potential sources of funding, it is possible that the success, if any,
of these efforts will not be sufficient to fund the Company for the foreseeable
future.  The Company has taken, and is continuing to take, substantial cost
cutting actions, including significant reductions in its number of employees.
In the event that the Company is unable to raise additional capital by the end
of May 1998, the Company may promptly cease significant portions of its
programs, projects and business operations.  If the pursuit of these potential
funding sources proves largely unsuccessful, the Company may be forced into the
complete termination of its business operations.

         The Company holds 2.0 million shares of common stock in Oncormed,
Inc., a publicly traded affiliate of the Company, whose shares have traded in
the first quarter of 1998 in the range of $4.75 to $7.50 per share.  The
Company is restricted from selling 1.0 million such shares in the public
markets due to outstanding options it has issued or anticipates issuing
pursuant to which the Company has offered to sell the shares to the option
holders for $2.00 per share.  While exercise of such options would generate
cash of approximately $2.0 million, such exercise is outside the control of the
Company.  The remaining 1.0 million shares of common stock of Oncormed can be
sold in the public markets only pursuant to restrictions on the sale of
unregistered stock by an affiliate pursuant to Rule 144 of the Securities Act
of 1933 such that the complete liquidation of this position in the public
markets likely would take a year or more.  Trading activity in Oncormed stock
is limited, which would further restrict the Company's ability to liquidate a
significant portion of its position.  The Company is also considering
attempting to secure a purchaser for a block of the stock in a private
transaction and currently is holding discussions with potential purchasers
pursuant to this effort.

         Risk Associated with the INFORM(TM) Her-2/neu Gene-Based Test System

         Although the PMA for the Oncor INFORM(TM) HER-2/neu Gene Detection
System was approved for marketing by FDA in December 1997, there can be no
assurance that the Company will be capable of manufacturing the test system in
commercial quantities at reasonable costs or marketing the product
successfully, that the test system will be accepted by the medical diagnostic
community, or that the market demand for the test system will be





                                       16
<PAGE>   19
sufficient to allow profitable sales.  In addition, product approvals may be
withdrawn if compliance with regulatory standards is not maintained or if
substantial problems occur after the product reaches the market.

         No Assurance of Regulatory Approvals; Government Regulation

         The Company expects to pursue FDA approval or clearance of certain
existing products and products under development.  There can be no assurance
that the Company will receive regulatory approval or clearance for any of its
products currently under development or, even if it does receive regulatory
approval or clearance for a particular product, that the Company will ever
recover its costs in connection with obtaining such approval or clearance.  The
timing of regulatory decisions is not within the control of the Company.  The
failure of the Company to receive requisite approval or clearance, or
significant delays in obtaining such approval or clearance, could have a
material and adverse effect on the business, financial condition and results of
operations of the Company.

         Approval or clearance by the FDA require lengthy, detailed and costly
laboratory procedures, clinical testing procedures and application preparation
and defense efforts to demonstrate a product's efficacy and safety (or
equivalence to a marketed product in the case of a 510(k) submission) before a
product can be sold for diagnostic use.  Even if such regulatory approval or
clearance is obtained for a product, its manufacturer and its manufacturing
facilities are subject to continual review and periodic inspections by the FDA
and other regulatory agencies.  The regulatory standards for manufacturing are
applied stringently by the FDA.  Discovery of previously unknown problems with
a product, manufacturer or facility may result in restrictions on such product
or manufacturer, including costly recalls or even withdrawal of the product
from the market.  Furthermore, approval may entail ongoing requirements for
postmarketing studies.  Failure to maintain requisite manufacturing standards
or discovery of previously unknown problems could have a material and adverse
effect on the Company's business, financial condition or results of operations.

         Patents and Proprietary Rights

         The Company's success will depend in large part on its, or its
licensors', ability to obtain patents, defend its patents, maintain trade
secrets and operate without infringing upon the proprietary rights of others,
both in the United States and in foreign countries.  The patent position of
firms relying upon biotechnology is highly uncertain in general and involves
complex legal and factual questions.  To date there has emerged no consistent
policy regarding the breadth of claims allowed in biotechnology patents or the
degree of protection afforded under such patents.  The Company relies on
certain patents and pending U.S. and foreign patent applications relating to
various aspects of its products.  These patents and patent applications are
either owned by the Company or rights under them are licensed to the Company.
There can be no assurance that patents will issue as a result of any such
pending applications or that, if issued, such patents will be sufficiently
broad to afford protection against competitors with similar technology.  In
addition, there can be no assurance that any patents issued to the Company, or
for which the Company has license rights, will not be





                                       17
<PAGE>   20
challenged, invalidated or circumvented, or that the rights granted thereunder
will provide competitive advantages to the Company.

         The commercial success of the Company will also depend upon avoiding
the infringement of patents issued to competitors and upon maintaining the
technology licenses upon which certain of the Company's current products are,
or any future products under development might be, based.  Litigation, which
could result in substantial cost to the Company, may be necessary to enforce
the Company's patent and license rights or to determine the scope and validity
of others' proprietary rights.  If competitors of the Company prepare and file
patent applications in the United States that claim technology also claimed by
the Company, the Company may have to participate in interference proceedings
declared by the PTO to determine the priority of invention, which could result
in substantial cost to the Company, even if the outcome is favorable to the
Company.  An adverse outcome could subject the Company to significant
liabilities to third parties and require the Company to license disputed rights
from third parties or cease using the technology.  A U.S. patent application is
maintained under conditions of confidentiality while the application is pending
in the PTO, so that the Company cannot determine the inventions being claimed
in pending patent applications filed by its competitors in the PTO.  Further,
U.S. patents do not provide any remedies for infringement that occurred before
the patent is granted.

         The University of California and its licensee, Vysis, Inc. ("Vysis"),
filed suit against Oncor on September 5, 1995 for infringement of U.S. Patent
No. 5,447,841 entitled Methods and Compositions for Chromosome Specific
Staining which issued on that same date.  The patent relates to a method of
performing in situ hybridization using a blocking nucleic acid that is
complementary to repetitive sequences.  On April 9, 1998, the Company, Vysis
and the University of California entered into a definitive agreement to settle
the litigation.  As part of the agreement, the Company, Vysis and the Regents
of the University of California stipulated to a final judgment order which was
approved and issued by the U.S. District Court for the Northern District of
California.  Under the terms of the definitive agreement, the Company obtained
a world-wide nonexclusive royalty-bearing license to U.S. Patent No.  5,447,841
and any divisionals, continuations, continuations-in-part, reissues,
extensions, reexaminations, substitutions, renewals and foreign counterparts
thereof throughout the world for use in the fields of human oncology for both
clinical and research applications.  The Company also obtained a nonexclusive
royalty-bearing license to certain direct labeling technology rights owned by
Vysis in U.S. Patent 5,491,224 and any divisionals, continuations,
continuations-in-art, reissues, extensions, reexaminations, substitutions,
renewals and foreign counterparts thereof throughout the world.  In return, the
Company has agreed to convey to Vysis its fluorescence in situ hybridization
(FISH) genetic probe business, retaining full rights to the field of human
oncology for research and clinical applications, including the Company's
recently FDA approved INFORM HER-2/neu breast cancer test.  Sales of the
conveyed FISH products represented less than $3.0 million of the Company's 1997
gross revenues.  The Company also made initial cash payments to Vysis of $0.5
million, and an additional payment of $1.5 million will be due on April 10,
2000 in order to extend the licenses beyond that date.





                                       18
<PAGE>   21
         One of the Company's patent applications asserts patent rights to the
Company's TRI-AMP(TM) technology.  The Company is a party to an interference
proceeding declared by the PTO involving Beckman Instruments, Inc.'s
("Beckman") and the Company's claims regarding that application.  There can be
no assurance as to the length of time for a decision to be rendered, or the
nature of the decision, in this interference proceeding or any potential appeal
therefrom.  If it is determined that Beckman's patent claims have priority over
the Company's claims, the Company may have no patent claim or protection with
respect to the Company's TRI-AMP(TM) technology, which could prevent or limit
the Company's ability to commercialize the Company's TRI-AMP(TM) technology,
absent a license from Beckman.  The Company has chosen not to contest priority
in the interference.

         On April 27, 1998, the Company received a summons and complaint in
connection wit a lawsuit entitled Key Technology, Inc.  v. Oncor, Inc. in the
Superior Court of the State of Washington for the County of Walla Walla.  The
complaint alleges breach of contract and fraud in connection with a June 1996
asset purchase agreement between Key Technology and the Company relating to the
sale of the Company's 1300 video inspection system to Key Technology, and seeks
damages against the Company of $1,475,000.  A failure to successfully defend
against or settle that suit would likely result in damages being assessed
against the Company and could have a material adverse effect on the Company's
business, financial condition or results of operations.

         The Company currently has certain licenses from third parties and in
the future may require additional licenses from other parties to develop,
manufacture and market commercially viable products effectively.  There can be
no assurance that such licenses will be obtainable on commercially reasonable
terms, if at all, that the patents underlying such licenses will be valid and
enforceable or that the proprietary nature of the patented technology
underlying such licenses will remain proprietary.

         The Company relies substantially on certain technologies that are not
patentable or proprietary and are therefore available to the Company's
competitors.  The Company also relies on certain proprietary trade secrets and
know-how that are not patentable.  Although the Company has taken steps to
protect its unpatented trade secrets and know-how, in part through the use of
confidentiality agreements with its employees, consultants and certain of its
contractors, there can be no assurance that these agreements will not be
breached, that the Company would have adequate remedies for any breach, or that
the Company's trade secrets will not otherwise become known or be independently
developed or discovered by competitors.

         Uncertainties Relating to Product Development

         The Company's actively marketed products other than the INFORM(TM)
HER-2/neu Gene Detection System have not been approved by the FDA and may be
sold only for research purposes in the United States and certain other
countries.  The Company has undertaken to seek FDA approval for certain of
these products, and may in the future undertake to seek such approval or
clearance for other products, and substantial additional





                                       19
<PAGE>   22
investment, laboratory development, clinical testing, controlled manufacturing
and FDA approval or clearance will be required prior to the commercialization
of such products for diagnostic purposes.  There can be no assurance that the
Company will be successful in developing such existing or future products, that
such products will prove to be efficacious in clinical trials, that required
regulatory approvals or clearances can be obtained for such products, that such
products, if developed and approved, will be capable of being manufactured in
commercial quantities at reasonable costs, will be marketed successfully or
will be accepted by the medical diagnostic community, or that market demand for
such products will be sufficient to allow profitable operations.

         International Sales and Foreign Exchange Risk

         The Company derived approximately $7.9 million, or 61% of its total
product revenues, from customers outside of the United States for the year
ended December 31, 1997.  The Company anticipates that a significant amount of
its sales will take place in European countries and Japan and likely will be
denominated in currencies other than the U.S. dollar.  These sales may be
adversely affected by changing economic conditions in foreign countries and by
fluctuations in currency exchange rates.  Any significant decline in the
applicable rates of exchange could have a material adverse effect on the
Company's business, financial condition and results of operations.
Approximately $6.0 million of the Company's current assets are denominated in
currencies other than U.S.  dollar.  These current assets consist of $2.4
million in cash, $1.0 million in restricted cash, $1.2 million in accounts
receivable, $1.0 million in inventory, and $0.4 million in prepaid expenses.
Additional risks inherent in the Company's international business activities
generally include unexpected changes in regulatory requirements, tariffs and
other trade barriers, lack of acceptance of products in foreign markets, longer
accounts receivable payment cycles, difficulties in managing international
operations, potentially adverse tax consequences, restrictions on repatriation
of earnings and the burdens of complying with a wide variety of foreign laws.
There can be no assurance that such factors will not have a material adverse
effect on the Company's future international revenues and, consequently, on the
Company's business, financial condition and results of operations.

         Limited Manufacturing Experience

         The Company's ability to conduct clinical trials on a timely basis, to
obtain regulatory approvals or clearances and to commercialize its products
will depend in part upon its ability to develop and maintain facilities to
manufacture its products, either directly or through third parties, at a
competitive cost in accordance with the FDA's prescribed current GMP and other
regulatory requirements.  Any failure to maintain manufacturing facilities in
accordance with the FDA's GMP requirements could result in the inability of the
Company to manufacture its products and may limit the Company's ability to
deliver its products to its customers, which would have a material and adverse
effect on the Company's business, financial condition and results of
operations.  No assurance can be given that the Company





                                       20
<PAGE>   23
will be able to develop and maintain GMP facilities or engage third parties to
do so at a cost acceptable to the Company.

         The Company has only limited experience in manufacturing products on a
commercial basis.  The Company believes that its existing manufacturing
facilities, along with available contiguous space currently under option to the
Company, will enable it to produce commercial quantities of its products
through 1998.  No assurance can be given, however, that manufacturing or
quality control problems will not arise if the Company increases production of
its products, or if additional facilities are required in the future.

         Limited Marketing and Distribution Experience

         The Company markets and sells its products for research purposes and,
once approved or cleared by the appropriate regulatory authority, for
diagnostic use, through its direct sales forces in both Europe and the United
States and indirectly through third parties in the Pacific Rim and other areas.
The Company only has limited experience in sales, marketing, training and
distribution.  In order to market its products directly, the Company must
maintain a sales force with technical expertise and an understanding of the
Company's products.  There can be no assurance that the Company will be able to
maintain such a sales force or that the Company's direct sales and marketing
efforts will be successful.  In addition, the Company's products compete with
the products of many other companies that currently have extensive and
well-funded marketing and sales operations.  There can be no assurance that the
Company's training, marketing and sales efforts will compete successfully
against such other companies.  To the extent the Company enters arrangements
with third parties, any revenues received by the Company will be dependent on
the efforts of such third parties, and there can be no assurance that such
efforts will be successful.

         Competition and Technological Change

         The diagnostic and biotechnology industries are subject to intense
competition and rapid and significant technological change.  Competitors of the
Company in the United States and in foreign countries are numerous and include,
among others, diagnostic, health care, pharmaceutical, biotechnology and
chemical companies, academic institutions, government agencies and other public
and private research organizations.  Many of these competitors have
substantially greater financial and technical resources and production and
marketing capabilities than the Company.  There can be no assurance that these
competitors will not succeed in developing technologies and products that are
more effective, easier to use or less expensive than those that have been or
are being developed by the Company or that would render the Company's
technology and products obsolete and noncompetitive.  The Company also competes
with various companies in acquiring technology from academic institutions,
government agencies and research organizations.  In addition, many of the
Company's competitors have significantly greater experience than the Company in
conducting clinical trials of new diagnostic products and in obtaining FDA and
other regulatory approvals of products for use in health care.  Accordingly,
the Company's competitors may succeed in





                                       21
<PAGE>   24
obtaining regulatory approval for products more rapidly than the Company.  See
"Business -- Competition."

         Investment in Oncormed, Appligene, and Codon

         The Company owns approximately 25% and 80% of the common stock of its
publicly-traded affiliates, Oncormed and Appligene, respectively, and 100% of
the outstanding capital stock securities of its privately held subsidiary,
Codon.  The shares of common stock of Oncormed, Appligene, and Codon held by
the Company are not currently freely tradeable and no public market exists for
the common stock of Codon.  Therefore, there can be no assurance that the
Company will be able to realize the economic benefit of its investment or
predict the timing of such realization.  The value of the Company's investment
in Oncormed and Appligene represent a significant portion of the total assets
of the Company and such value fluctuates with the market price of those
companies' common stock.  Therefore, any event that has a material and adverse
effect on the market price of the common stock of Oncormed and Appligene will
have a material and adverse effect on the value of the Company's investment in
those companies.  Although Stephen Turner, the Company's Chief Executive
Officer, is a Director of Oncormed and, along with the Company's Chief
Financial Officer, are directors of Appligene and the Company is a significant
stockholder in those companies, the Company does not control the day-to-day
operations and management of those companies and, therefore, has a varying but
limited direct control over their operations and financial results.

         Codon is presently seeking additional funding from other sources to
continue its research efforts, although there can be no assurance that the
Company will be able to obtain such funding on commercially reasonable terms,
if at all.  The Company expects to continue to advance funds to Codon until
such time, if ever, as Codon secures sufficient funding from third parties.
Nevertheless, the Company could elect to withdraw such support at any time,
which would likely necessitate Codon ceasing operations and which would have a
material and adverse effect on the value of the Company's investment in Codon.

         Restricted Use of the Company's Products

         The sale, distribution and use of the Company's FDA approved breast
cancer product in the United States is restricted to prescription use in that
the users of the product must be trained and demonstrated proficient in the use
of the product and the results of the proficiency testing provided as part of
the Company's training program must be provided in the Company's Annual Reports
to the FDA.  The Company's products sold in the United States for research
purposes, only, must be labeled accordingly.  The FDA imposes distribution
requirements and procedures on companies selling products for research purposes
only, including the requirement that the seller receive specified
certifications from its customer as to the customer's intended use of the
product.  As a result of these requirements, the Company's research products
can only be sold in the United States to a limited number of customers for
limited use and can only be  sold for broader commercial use with FDA approval
or clearance or pursuant to recent Analytic Specific Reagent regulations for
which





                                       22
<PAGE>   25
no clinical claims can be made.  No assurance can be given that the Company
will receive FDA approval or clearance for its research products or that it
will be able to sell its approved products in larger quantities.  See "Business
- -- Government Regulation."

         Government Funding

         The Company's products being sold for research purposes only are in
large part purchased by cancer researchers operating under government funded
programs both in the U.S. and in foreign countries.  These products are also
purchased by researchers involved in the human genome project, which is
likewise principally funded by national governments.  There can be no assurance
that such government funding will continue at its current level.  The Company
would be adversely affected by decreases in or changes in the direction of
government funding for cancer research or human genome research.

         Attraction and Retention of Key Personnel

         The Company's ability to successfully develop marketable products and
to maintain a competitive position will depend in large part on its ability to
attract and retain highly qualified scientific and management personnel. The
Company is highly dependent upon the principal members of its management,
scientific staff, and Medical and Science Advisory Boards.  Competition for
such personnel and advisors is intense, and there can be no assurance that the
Company will be able to continue to attract and retain such personnel.  See
"Business -- Employees."

         Uncertainty Related to Health Care Reform
           Measures and Third-Party Reimbursement

         Political, economic and regulatory influences are likely to lead to
fundamental change in the health care industry in the United States.  In the
past year, the U.S. FDA Modernization Act ("FDAMA") was approved, bringing many
changes to FDA regulations and codifying some current practices.  In addition,
numerous proposals for comprehensive reform of the nation's health care system
have been introduced in Congress over the past year.  In addition, certain
states are considering various health care reform proposals.  The Company
anticipates that Congress and state legislatures will continue to review and
assess alternative health care delivery systems and payment methodologies, and
that public debate of these issues will likely continue in the future.  Due to
uncertainties regarding the ultimate features of reform initiatives and their
enactment and implementation, the Company cannot predict which, if any, reforms
will be adopted, when they may be adopted, or what impact they may have on the
Company.  The Company's ability to earn sufficient returns on its products may
also depend in part on the extent to which reimbursement for the costs of such
products will be available from government health administration authorities,
private health insurers and other organizations.  Third-party payors are
increasingly challenging the price and cost effectiveness of medical products
and services.  Significant uncertainty exists as to the reimbursement status of
newly approved health care products, and there can be no





                                       23
<PAGE>   26
assurance that adequate reimbursement will be available or sufficient to allow
the Company to sell its products on a competitive basis.

         Product Liability

         The testing, marketing and sale of health care products could expose
the Company to the risk of product liability claims.  A product liability claim
could have a material and adverse effect on the business, results of operations
or financial condition of the Company.  The Company currently maintains product
liability insurance coverage of $5.0 million per occurrence.  There can be no
assurance, however, that the insurance policy will respond to any specific
claim, that this coverage will be adequate to protect the Company against
future product liability claims or that product liability insurance will be
available to the Company in the future on acceptable terms, if at all.

         Environmental Risks

         The manufacturing and research and development processes of the
Company involve the controlled use of hazardous materials.  The Company is
subject to federal, state and local laws and regulations governing the use,
manufacture, storage, handling and disposal of such materials and certain waste
products.  Although the Company believes that its activities currently comply
with the standards prescribed by such laws and regulations, the risk of
accidental contamination or injury from these materials cannot be eliminated.
In the event of such an accident, the Company could be held liable for any
damages that result and any such liability could exceed the resources of the
Company.  In addition, there can be no assurance that the Company will not be
required to incur significant costs to comply with environmental laws and
regulations in the future.

         Possible Volatility of Stock Price

         The market prices for securities of life sciences companies, including
the Company, have been highly volatile and the market has experienced
significant price and volume fluctuations that are unrelated to the operating
performance of particular companies.  Announcements of technological
innovations or new commercial products by the Company or its competitors,
developments concerning proprietary rights, including patents and litigation
matters, publicity regarding actual or potential clinical trial results with
respect to products under development by the Company or others, decisions
regarding regulatory approvals of the products of the Company or others,
regulatory developments in both the United States and foreign countries, public
concern as to the efficacy of new technologies, general market conditions, as
well as quarterly fluctuations in the Company's revenues and financial results
and other factors, may have a significant impact on the market price of the
Common Stock.  In particular, the realization of any of the risks described in
these "Risk Factors" could have a dramatic and adverse impact on such market
price.





                                       24
<PAGE>   27
ITEM 2.  PROPERTIES

         The Company's principal administrative, marketing, manufacturing and
research and development facilities consist of approximately 81,000 square feet
in Gaithersburg, Maryland and 12,000 square feet in Strasbourg, France.  The
Company occupies the Gaithersburg, Maryland facilities under four lease
agreements expiring in March 2004 with options to extend the principal leases
for up to two additional five year terms.  The facilities in Strasbourg, France
are under a capital lease with a term of 15 years, expiring in 2010.  The
Company believes that it will not require additional space in the foreseeable
future.  The Company will likely have excess space under lease, if it is
successful in disposing of either or both of its non-strategic business units.
There can be no assurance that the Company will be able to sublease or
terminate the prime lease for such space, on an economic basis, if at all.

ITEM 3.  LEGAL PROCEEDINGS

         As noted under "Item 1.  Business - Additional Risk Factors - Patents
and Proprietary Rights," elsewhere in this Annual Report, the Company has
received notices from time to time claiming that certain of the Company's
products infringe patents of third parties and has submitted the notices to its
patent counsel for review.  There can be no assurance, however, that these
claims will not give rise to infringement proceedings involving the Company or
that the Company would prevail in any such proceedings.  Patent litigation has
frequently proven in recent years to be complex and expensive and the outcome
of patent litigation can be difficult to predict.  If the Company were to be
precluded from selling products incorporating the disputed technologies or
required to pay damages or make additional royalty or other payments with
respect to such sales, the Company's business, financial condition and results
of operations could be materially and adversely affected.

         The University of California and its licensee, Vysis, Inc. ("Vysis"),
filed suit against Oncor on September 5, 1995 in the United States District
Court for the Northern District of California (the "Court"), alleging
infringement of U.S. Patent No.  5,447,841 entitled Methods and Compositions
for Chromosome Specific Staining which issued on that same date.  The patent
relates to a method of performing in situ hybridization using a blocking
nucleic acid that is complementary to repetitive sequences which are present in
the hybridization probe.  On April 9, 1998, the Company and Vysis entered into
a definitive agreement to settle this litigation.  Under the terms of the
definitive agreement, the Company obtained a non-exclusive royalty-bearing
license to U.S.  Patent No. 5,447,841 for use in the fields of human oncology
for both clinical and research applications.  The Company also obtained a
non-exclusive royalty-bearing license to certain direct labeling technology
rights owned by Vysis.  Oncor, in turn, agreed to convey to Vysis its
fluorescence in situ hybridization (FISH) genetic probe business, retaining
full rights to the field of human oncology for research and clinical
applications, including the Company's INFORM(TM) HER-2/neu breast cancer test.
Sales of the conveyed FISH products represented less than $3.0 million of the
Company's 1997 gross revenues.  The Company will also make an initial





                                       25
<PAGE>   28
cash payment to Vysis of $500,000 and an additional payment of $1.5 million on
April 9, 2000.

         On April 27, 1998, the Company received a summons and complaint in
connection with a lawsuit entitled Key Technology, Inc.  v. Oncor, Inc. in the
Superior Court of the State of Washington for the County of Walla Walla.  The
complaint alleges breach of contract and fraud in connection with a June 1996
asset purchase agreement between Key Technology and the Company relating to the
sale of the Company's 1300 video inspection system to Key Technology, and seeks
damages against the Company of $1,475,000.  A failure to successfully defend
against or settle that suit would likely result in damages being assessed
against the Company and could have a material adverse effect on the Company's
business, financial condition or results of operations.

         A former employee brought suit against the Company in France for
approximately $0.3 million and instituted arbitration proceedings for $0.6
million, all related to the employee's termination.  The plaintiff has obtained
a ruling that the Company must retain in escrow an amount of funds equal to the
aggregate amount of the claims.  Such amounts are shown on the balance sheet as
restricted cash.  Management believes that the outcome of these matters will
not be material to the results of operations or financial condition of the
Company.


ITEM 4.          SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

         None.





                                       26
<PAGE>   29
                                    PART II


ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED
STOCKHOLDER MATTERS

         The Company's Common Stock is traded on the American Stock Exchange
(the "Exchange") under the symbol "ONC."  The following table sets forth, for
the calendar periods indicated, the range of high and low sale prices for the
Common Stock as reported by the Exchange:


<TABLE>
<CAPTION>
                                                                         HIGH        LOW
                                                                         ----        ---
 <S>                                                                     <C>         <C>
 1996
 First Quarter                          . . . . . . . . . .               6 7/8       4 1/8
 Second Quarter                         . . . . . . . . . .               7           4 7/8
 Third Quarter                          . . . . . . . . . .               5 5/8       3 7/8
 Fourth Quarter                         . . . . . . . . . .               5 3/16      3 5/8

 1997
 First Quarter                          . . . . . . . . . .               5 1/4       3 3/8
 Second Quarter                         . . . . . . . . . .               4 5/8       3
 Third Quarter                          . . . . . . . . . .               5 3/16      3 9/16
 Fourth Quarter                         . . . . . . . . . .               5 1/4       3 1/2
</TABLE>


HOLDERS

         As of December 31, 1997, the approximate number of record holders of
Common Stock was 424.

DIVIDENDS

         The Company has never declared or paid any cash dividends on its
Common Stock.  The Company currently intends to retain all future earnings, if
any, for the operation and expansion of its business and does not anticipate
paying any cash dividends in the foreseeable future.





                                       27
<PAGE>   30
ITEM 6.         SELECTED CONSOLIDATED FINANCIAL DATA

         The selected consolidated financial data set forth below as of
December 31, 1993, 1994, 1995, 1996 and 1997 and for each of the periods then
ended, have been derived from the audited consolidated financial statements of
the Company.  The consolidated financial statements of the Company as of
December 31, 1996 and 1997 and for each of the years in the three-year period
ended December 31, 1997, together with the  thereto and the related report of
Arthur Andersen LLP, independent public accountants, are included elsewhere in
this Annual Report.  The selected financial data set forth below should be read
in conjunction with the consolidated financial statements of the Company and
related notes thereto and "Management's Discussion and Analysis of Financial
Condition and Results of Operations" included elsewhere in this Annual Report.


<TABLE>
<CAPTION>
                                                                     YEAR ENDED DECEMBER 31,
                                                    1993         1994         1995         1996          1997
                                                    ----         ----         ----         ----          ----
                                                              (In thousands, except per share data)
<S>                                                  <C>       <C>          <C>         <C>            <C>
STATEMENT OF OPERATIONS  DATA:
Gross revenues:
         Product sales  . . . . . . . . . .          $9,238       $12,425     $16,193      $15,323      $12,949
         Grant revenue  . . . . . . . . . .              62           342         894          483          208
         Contract revenue . . . . . . . . .               -            48         300          200          200
                                                 -----------   -----------  -----------  -----------  -----------
                Total gross revenues  . . .           9,300        12,815      17,387       16,006       13,357
                                                 -----------   -----------  -----------  -----------  -----------
Operating expenses:
         Direct cost of sales . . . . . . .           4,376         7,254       8,279        9,656        8,515
         Restructuring expense  . . . . . .               -             -           -        2,075           -
         Amortization of intangible assets                -           414       1,339        1,323        1,157
         Selling, general and
           administrative  . . . . . .                7,575         9,539      13,752       15,073       14,825
         Research and development . . . . .           9,117         9,609      10,422        9,822        9,232
         Write off acquired R&D projects                                 
           In process . . . . . . . . . . .               -         3,574           -            -           -

                                                 -----------   -----------  -----------  -----------  -----------
Total operating expenses. . . . . . . . . .          21,068        30,390      33,792       37,949       33,729
                                                 -----------   -----------  -----------  -----------  -----------
Loss from operations  . . . . . . . . . . .         (11,768)     (17,575)     (16,405)     (21,943)     (20,372)

Other income (expenses), net  . . . . . . .             681       (2,003)      (1,825)      (7,037)     (10,575)
                                                 -----------   -----------  -----------  -----------  -----------
Net loss  . . . . . . . . . . . . . . . . .        $(11,087)    $(19,578)    $(18,230)    $(28,980)    $(30,947)
                                                 -----------   -----------  -----------  -----------  -----------
Net loss per share(1) . . . . . . . . . . .          $(0.71)      $(1.01)      $(0.87)      $(1.26)      $(1.21)


Weighted average shares outstanding . . . .          15,558        19,437      20,888       23,031       25,547
</TABLE>
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                     1993         1994         1995         1996          1997    
                                                     ----         ----         ----         ----          ----    
                                                                (In thousands)                                    
<S>                                                  <C>          <C>          <C>         <C>            <C>     
BALANCE SHEET DATA:                                                                                               
Cash and liquid investments, including                                                                            
 restricted cash  . . . . . . . . . . . . .         $18,587       $23,301      $15,830     $18,880        $4,997  
Total assets  . . . . . . . . . . . . . . .          29,201        51,525       46,121      41,670        23,884  
Long-term liabilities . . . . . . . . . . .             164         2,513        9,320      10,386         6,126  
Accumulated deficit . . . . . . . . . . . .         (34,848)      (54,427)     (72,657)   (101,637)     (132,584) 
Stockholders' equity  . . . . . . . . . . .          24,186        40,279       25,987      23,344         3,188  
- -----------
</TABLE>
(1)      Net loss per share is determined using the weighted-average number of
         shares of Common Stock outstanding during the years
         presented.  The effects of options, warrants, and notes payable to
         stockholders have not been considered, since the effects would be
         antidilutive.





                                       28
<PAGE>   31
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
RESULTS OF OPERATION

         The following discussion and analysis provides information which
management believes is relevant to an assessment and understanding of the
Company's results of operations and financial condition.  The discussion should
be read in conjunction with the audited consolidated financial statements of
the Company and notes thereto.  This Report contains certain statements of a
forward-looking nature relating to future events or the future financial
performance of the Company.  Investors are cautioned that such statements are
only predictions and that actual events or results may differ materially.  In
evaluating such statements, investors should specifically consider the various
factors identified in this Report and in the Company's other public filings
which could cause actual results to differ materially from those indicated by
such forward-looking statements, including the matters set forth in the various
captions under the section "Business," most significantly under the caption
"Additional Risk Factors."

OVERVIEW

         The Company has incurred significant cash losses throughout its
existence and has no immediate expectations to achieve cash positive operations
until sometime in 1999.  The Company's current cash resources are nearly
depleted and any cash infusions would likely be required to be utilized first
to repay, in whole or in part, bank debt obligations of $3.5 million.  As
described in "Liquidity and Capital Resources" below, the Company has
identified several potential sources of additional capital.  There can be no
assurance that any of these sources will provide the capital necessary for the
Company to continue its operations at their current levels, or at all.  The
inability of the Company to obtain additional financing would have a material
adverse effect on the Company's business, financial condition and results of
operations, including possibly requiring the Company to curtail or cease its
operations.

         Effective February 28, 1998, the Company exchanged approximately 1.65
million shares or common stock for all the outstanding shares of Codon
Pharmaceuticals, Inc., formerly known as OncorPharm, Inc. ("Codon").  The
effect of this transaction was to increase the Company's ownership of Codon to
100%.  This transaction has been accounted for as a purchase.  Of the purchase
price of approximately $6.2 million, $5.7 million has been allocated to
research and development projects in process and expenses in the first quarter
of 1998.  As a result of this transaction, all of Codon's operating expenses
and losses have been and will continue to be included in the operating results
of the Company from the effective date of the acquisition.

         Effective April 10, 1998, the Company conveyed its non-oncology
genetic probe business unit and cash of $0.5 million to Vysis, Inc. as
consideration for obtaining certain key royalty-bearing licenses and for
settling claims of past patent infringement and related claims made against the
Company.  As a result of this transaction, beginning in the second





                                       29
<PAGE>   32
quarter of 1998, the Company will report significantly reduced sales, costs of
sales and selling, general, administrative, research and development expenses
of the Company.  Revenues for this business unit in 1997 were approximately
$3.0 million.  The Company believes that the total costs and expenses
associated with the business unit in 1997 were greater than $3.0 million.  As a
result, the Company expects that results of operations starting in the second
quarter of 1998 will reflect the decreased sales and expenses attributable to
that business unit.  The Company is currently seeking a purchaser for its
non-strategic research products business unit.  If such transaction were to be
completed, the sales, costs and expenses as noted above will be further reduced
by a substantial amount.  Collectively, these two units are referred to as the
non-strategic operating units of the Company.

RESULTS OF OPERATIONS

         Consolidated product sales decreased 15% to $12.9 million in 1997
compared to $15.3 million in 1996, which represented a 5% decrease from $16.2
million in 1995.  In 1997, the sales decrease was attributable largely to the
full-year effect of the restructuring of certain product lines in the U.S. in
1996 (-16%) and a decrease in the exchange rate of the French franc (-6%),
partially offset by an increase in sales of continuing products (+7%).  After
adjusting for the elimination of the sales of discontinued products, sales of
continuing products increased 14% from 1995 to 1996.  The Company has begun
commercialization of INFORM(TM) HER-2/neu in 1998, but cannot predict the
impact on sales at this time.

         The Company is actively pursuing the sale of its research products
business unit, which currently generates sales and margins which are
significant to the sales of the Company.  If such sale is consummated, the
reported sales and margins of the Company thereafter would be materially and
adversely affected.

         Contract and grant revenue decreased 40% to $0.4 million in 1997
compared to $0.7 million in 1996, which decreased 43% from $1.2 million in
1995.  The contract and grant revenue decreased in 1997 and 1996 due to the
completion of grants received from the National Institutes of Health, one in
the middle of 1994 and the other early in 1995.  Four new grants were received
in 1997; however, two of the grants will end in 1998 which will likely cause
grant revenues to decrease further.

         Gross profit as a percentage of sales decreased to 34% in 1997 from
37% in 1996, which represented a decrease from 49% in 1995.  The decrease in
1997 was due to certain product mix changes (2.1%) and competitive pressures on
European margins (0.5%), and to costs incurred in the United States for
validating, regulating, and scaling up the initial stages of the manufacture of
a recently FDA-approved controlled diagnostic product, INFORM(TM) HER-2/neu
(1.5%, more than offsetting the benefits of the restructuring efforts).
Specifically, the Company discontinued the sale of certain products, mainly
high-end imaging equipment, which had high gross margins but which had low or
negative net margins after recognizing the relating selling, servicing and
collection expenses.  The Company cannot





                                       30
<PAGE>   33
estimate the future effects on cost of sales and margins of the conversion to
manufacturing products in conformity with Good Manufacturing Practices as
promulgated by the U.S. Food and Drug Administration.  The decrease in 1996 was
due to (i) product mix changes and competitive pressures on margins in Europe,
(ii) costs for regulating the initial stages of the manufacture of a controlled
diagnostic product and (iii) diseconomies of scale with respect to
manufacturing overhead resulting from reduced production in an effort to lower
inventory levels.

         The Company's restructuring expense in 1996 of $2.1 million comprise
the revaluation of inventory of discontinued products, charge-off of goodwill
associated with such products, and severance payments to employees terminated
in conjunction with the Company's restructuring plan.  The goodwill charge-off
was related to the computerized imaging products. There were no restructuring
costs in 1997 or 1995.  The restructuring program was anticipated to, and did,
have an immediate effect on sales, gross margins, and selling, general and
administrative expenses.  The sales declines noted above for 1996 and 1997 were
due in large measure to retirement from the market of more that one hundred
products, most notably the computerized imaging and Appligene products with
respect to the U.S.  Gross margins declined as a result of these actions
because the gross margin on the sales of imaging systems historically had been
higher than on the weighted average gross margins of other Oncor products. 
These lost margins were more than offset by savings resulting from the
termination of all imaging system employees, expenses for whom were reported
primarily in selling, general, administrative, research and development
departments.

         Amortization of intangible assets in 1997, 1996, and 1995 is due to
the amortization of the portion of the purchase price of Appligene attributable
to the value of intangible assets acquired, primarily for contracts, completed
research projects, and the excess of the purchase price over the book value of
the assets acquired.  The slight decline in the amortization over the periods
presented was due to the change in exchange rates and the completed research
projects being fully amortized during 1996.  The intangible assets are being
amortized on a straight line basis over periods ranging from two to ten years,
with a weighted average period of approximately eight years.

         Selling, general and administrative expenses decreased 2% to $14.8
million in 1997, compared to $15.1 million in 1996, which represented a 10%
increase from $13.8 million in 1995.  The decrease in 1997 was due to a
reduction in legal expenses associated with certain intellectual property
matters (decreased $1.5 million), the change in exchange rates (decreased $0.5
million), and the full year beneficial effects of the restructuring plan
instituted in the second quarter of 1996 in the U.S.  (decreased $0.1 million).
These decreases were partially offset by legal and other expenses associated
with certain proposed strategic transactions (increased $1.4 million) and with
a lawsuit brought by a former employee (increased $0.4 million).  The increase
in 1996 was due to administrative expenses associated with the public reporting
status of Appligene (increased $0.5 million) and the above mentioned expenses
associated with certain intellectual property matters (increased $1.6 million)
more than offsetting the beneficial effects of cost reduction programs





                                       31
<PAGE>   34
(decreased $0.1 million) and deconsolidation of the operating results of Codon
in 1996 (decreased $0.7 million).  The legal expenses associated with certain
intellectual property issues may increase in 1998 to or beyond levels
experienced in previous years because the issues being litigated are scheduled
to come to trial in the second quarter of 1998.  Selling expenses for
diagnostic products will likely increase in 1998 as the Company introduces and
promotes the sale of the Company's newly approved diagnostic product,
INFORM(TM) HER-2/neu.  If the Company is successful in divesting either or both
of its non-strategic business units, overall selling, general and
administrative expenses will likely decrease substantially.

         Research and development expenses remained level at approximately $7.3
million and $7.2 million for 1997 and 1996, respectively, which represented a
decrease of 11% from $8.2 million in 1995.  In 1997, the beneficial effects of
the restructuring plan instituted in the second quarter of 1996 were offset by
an increase in research and development expenses in Europe.  The decrease in
1996 resulted primarily from the deconsolidation of the operating results of
Codon and project cessations as a result of the restructuring plan, partially
offset by the expenses associated with the initial payments, made in common
stock of the Company, for certain research and development collaboration
agreements.  If the Company is successful in divesting either or both of its
non-strategic business units, overall research and development expenses will
likely decrease substantially.

         Clinical and regulatory expenses decreased 20% to $2.0 million in
1997, compared to $2.5 million in 1996, which represented a 13% increase from
$2.3 million in 1995.  The decrease in 1997 is primarily due to lower costs for
manufacturing validation and regulation costs related to the application for
FDA approval of its newly approved diagnostic tests partially offset by
increased staff hired to support the Company's efforts with respect to the
support of its diagnostics products.  The increase in 1996 is attributable to
the substantial regulatory efforts associated with the applications for FDA
approval of certain diagnostic tests.  Clinical and regulatory expenses may
increase in 1998 as the Company seeks FDA approval for improved technology and
additional claims both associated with its newly approved diagnostic test.  If
the Company is successful in divesting either or both of its non-strategic
business units, overall clinical and regulatory expenses may likely decrease
substantially.

         As a result of the factors discussed above, net operating loss
decreased 7% to $20.4 million in 1997 compared to $22.0 million in 1996, which
represented an increase of 34% from $16.4 million in 1995.

         Investment income remained unchanged at $0.5 million for both 1997 and
1996, which represented a 50% decrease from $1.0 million in 1995.  The level of
investment income is directly related to the level of investment funds which
increased in late 1995 and late 1996 with the private placements, in each case
partially depleted thereafter by subsequent cash operating losses of the
Company.





                                       32
<PAGE>   35
         Interest and other expenses of $6.8 million, $3.1 million, and $0.5
million in 1997, 1996, and 1995, respectively, represented primarily interest
expense which has become substantially more significant through (i) the
issuance of options in conjunction with a line of credit, which bears interest
at the prime rate plus 2%; (ii) the amortization of the beneficial conversion
feature in the issuance of convertible debentures in 1996 and 1995; and (iii)
cash interest expense.  The following table sets forth the most significant
elements of interest and other expenses:
<TABLE>
<CAPTION>
                                                                        1997           1996            1995
                                                                        ----           ----            ----
                                                                           (Dollars in Millions)
         <S>     <C>                                                       <C>           <C>             <C>
         (i)     Valuation of options                                      $1.8          $  -            $ -
         (ii)    Issuance of debentures                                    4 .3            3.0             -
         (iii)   Cash interest expense and other                           0 .7            0.1            0.5
                                                                         ------         ------          -----

                 Total                                                     $6.8           $3.1           $0.5
</TABLE>


         In 1997 and 1996, the interest and other expenses included non-cash
charges of $6.1 million and $3.0 million, respectively.


         Equity in net loss of affiliates was $4.3 million in 1997 as compared
to $4.4 million  and $2.4 million in 1996 and 1995, respectively.  The
Company's proportionate share of net losses attributable to Codon in 1997
decreased compared to 1996 due to a decrease in the Company's ownership
interest in Codon.  In 1995, Codon losses were included in operating results
which caused the 1996 amount to increase accordingly.  The remainder of the
equity in net loss of affiliates was attributable to the Company's interest in
the losses of its other unconsolidated affiliate, Oncormed.  As described in
"General" above, Oncor re-acquired 100% of the stock of Codon in the first
quarter of 1998, and as a result all of Codon's losses will be included in the
Company's operating losses for the foreseeable future.

         As a result of the factors discussed above, net loss increased 7% to
$30.9 million in 1997 compared to $29.0 million in 1996, which represented an
increase of 59% from $18.2 million in 1995.

         The Company does not believe that inflation has had a material effect
on its results of operations during the last three years.





                                       33
<PAGE>   36
LIQUIDITY AND CAPITAL RESOURCES

         Overview

         The consolidated cash and liquid investments balances of the Company
were $4.1 million and $4.6 million at April 30, 1998 and March 31, 1998,
respectively, compared to $5.0 million at December 31, 1997.  Approximately
$2.1 million and $2.8 million of the cash and liquid investments at April 30,
1998 and March 31, 1998, respectively, are limited to fund operations of the
Company's European subsidiary.  Liquid investments include restricted cash,
cash equivalents and short-term investments as set forth on the consolidated
balance sheet included elsewhere in this filing.

         In January 1998, the Company completed a $5 million equity financing
in a private placement of 500 shares of Series A preferred stock, which are
convertible into Common Stock.

         In April 1998, the Company increased its secured line of credit from
$3.0 million to $3.5 million, which the Company has fully drawn down. The
Company is negotiating an increase in the line of credit to $4.0 million,
although there can be no assurance that the Company will be able to negotiate
such an increase on commercially acceptable terms, if at all.

         Analysis of Historical Cash Losses

         The following table sets forth the most significant elements of the
cash flows of the Company in 1997 (in millions of dollars):

<TABLE>
         <S>                                                                             <C>
         Cash and liquid investments at January 1, 1997                                  $18.9

         Net cash used in operating activities                                           (15.6)

         Proceeds from issuance of debentures                                              2.0

         Effects of foreign exchange rate adjustments                                     (0.9)

         Loans to unconsolidated affiliate                                                (1.7)

         Proceeds from borrowings against a line of credit
          due in October 1998                                                              3.0

         Purchases of equipment                                                           (0.8)

         Exercise of stock options and other                                               0.1
                                                                                         ------

         Cash and liquid investments at December 31, 1997                                 $5.0
                                                                                         ======
</TABLE>


         Approximately $1.0 million of the cash and liquid investments is held
in escrow in France pending the outcome of legal disputes between the Company
and the former President of Appligene.  Such disputes are scheduled to be
adjudicated in the second quarter of 1998.





                                       34
<PAGE>   37
         The net cash loss from operations is the result of the losses of the
Company discussed in "Results of Operations" above in this Management's
Discussion and Analysis.

         The proceeds of $2.0 million from the issuance of debentures were from
a private placement completed in January of 1997.  The effects of foreign
exchange rate reflects the 14% decrease in the French franc compared to the
U.S. dollar.  The loans to the unconsolidated affiliate represents funds
advanced to Codon to finance the operations of this affiliate.  The Company
expects such advances to continue at a rate of $0.6 million per quarter until
such time, if ever, as Codon secures funding from third parties sufficient to
support its operating needs.  The proceeds from the line of credit were secured
from a bank line of credit expiring October 31, 1998.

         Purchases of equipment are for the on-going replacement of office and
laboratory equipment; the Company expects such purchases to increase as larger
scale facilities are prepared for the anticipated manufacture of certain
products, including INFORM.  Any substantial leasehold improvements which may
be required in manufacturing facilities are expected to be funded by the
Company's primary landlord in accordance with the Company's current lease
agreements.

         The Company leases most of its facilities under operating leases with
aggregate annual obligations for 1998 of $1.1 million.  The Company has
committed to expend $0.8 million in support of various research agreements in
1998.

         As of April 30, 1998, the Company had an available consolidated cash
balance of approximately $3.2 million, of which approximately $2.0 million is
available for use in North America after the recent payment for the acquisition
of a strategic license.  The divestiture of certain non-strategic assets and
other cost-cutting actions, which are expected to be completed by June 30,
1998, will reduce the Company's ongoing cash requirements significantly.  The
Company expects that its current liquid resources will not be sufficient to
fund operations after the end of May 1998.

         In April 1998, the Company increased its secured line of credit from
$3.0 million to $3.5 million, which the Company has fully drawn down.  The
Company received in May 1998 a definitive term sheet to increase a secured line
of credit from $3.5 million to $4.0 million, although there can be no assurance
that the Company will be able to negotiate such an increase on commercially
acceptable terms, if at all. The Company is considering additional alternative
forms of financing, including among other things, (1) equity or debt financing,
(2) sale of significant assets, including its nonstrategic research products
business unit, which may result from the previously announced retention of
Lehman Brothers by the Company to explore strategic alternatives to increase
stockholder value, including sale of the Company, (3) sale of publicly-traded
Oncormed common stock, (4) third party funding of Codon for future cash
requirements and recovery of Oncor advances to Codon and (5) other





                                       35
<PAGE>   38
alternatives.  After the acquisition of Codon, Oncor includes in its
consolidated cash position any amounts raised through the separate financing
efforts of Codon.  Funds, if any, raised from most of these possible sources
must first be utilized to repay, in whole or in part, the Company's bank debt
of $3.5 million in accordance with the terms of the underlying line of credit
and related guarantees.

         The Company holds 2.0 million shares of common stock in Oncormed,
Inc., a publicly traded affiliate of the Company, whose shares have traded in
the first quarter of 1998 in the range of $4.75 to $7.50 per share.  The
Company is restricted from selling 1.0 million such shares in the public
markets due to outstanding options it has issued or anticipates issuing
pursuant to which the Company has offered to sell the shares to the option
holders for $2.00 per share.  While exercise of such options would generate
cash of approximately $2.0 million, such exercise is outside the control of the
Company.  The remaining 1.0 million shares of common stock of Oncormed can be
sold in the public markets only pursuant to restrictions such that the complete
liquidation of this position in the public markets likely would take a year or
more.  Trading activity in Oncormed stock is limited, which would further
restrict the Company's ability to liquidate a significant portion of its
position.  The Company is also considering attempting to secure a purchaser for
a block of the stock in a private transaction and currently is holding
discussions with potential purchasers pursuant to this effort.

         The Company believes that it will be able to continue to fund its
operations through the end of 1998 through a combination of (i) generating
sufficient cash from operations or financings and (ii) reducing its on-going
expenses.  This belief is based on: (1) its success in raising four rounds of
equity financing in the past two years; (2) the recent credit support provided
to the Company by certain of its key shareholders; (3) substantial and ongoing
interest expressed by members of industry in purchasing non-core assets of the
Company; (4) the recent FDA approval of the Company's flagship diagnostic test;
(5) high scores by governmental agencies on evaluations of requests by the
Company for significant research grants in 1998; (6) the recent settlement of
extremely costly and disruptive litigation; and (7) the recent actions taken to
cut discretionary expenses approximately 50% without jeopardizing the ongoing
sales of key products.

         In April 1998, two of the alternative forms of financing, which the
Company had previously reported as being in more advanced stages for
discussions, subsequently were not converted from the term sheet stage to that
of definitive agreements.  The Company continues actively to pursue similar
transactions with other parties.

         There can be no assurance that any of the alternatives discussed
above, or any other such forms of financing, can be completed by the Company in
sufficient amounts in timely fashion on acceptable terms, or at all, which
would have a material adverse effect on the Company.  Even if completed, each
of such financing alternatives may have certain terms, conditions or
ramifications which may have a material adverse effect on the Company's
business, financial condition and results of operations.  For instance, any
such equity





                                       36
<PAGE>   39
financings likely will be dilutive to stockholders; the terms of any debt
financing, as does the existing line of credit, may require substantially all
of the assets of the Company to be pledged as collateral, may involve warrant
or equity dilution and/or may contain restrictive covenants which limit the
Company's ability to pursue certain courses of action; and the sale of assets
will decrease the revenue base of the Company.

         While the Company is using its best efforts to consummate one or more
of these potential sources of funding, it is possible that the success, if any,
of these efforts will not be sufficient to fund the Company for the foreseeable
future.  The Company has taken, and is continuing to take, substantial cost
cutting actions, including significant reductions in its number of employees.
In the event that the Company is unable to raise additional capital by the end
of May 1998, the Company may promptly cease significant portions of its
programs, projects and business operations.  If the pursuit of these potential
funding sources proves largely unsuccessful, the Company may be forced into the
complete termination of its business operations.

         Cash Position in Europe

         In the absence of any unforeseen downside of exceptional nature, the
Company believes that its current cash position in Europe is at least
sufficient to fund the European operation through the end of the year.

         Effort to Obtain Strategic Transaction

         In June 1997, the Company engaged Lehman Brothers to assist in
securing strategic alliances, including the possible sale of the Company, which
would, among other effects, alleviate the Company's cash requirements.  There
can be no assurance that any such transaction will be concluded.

         Year 2000 Compliance

         Many currently installed computer systems and software products are
coded to accept only two digit entries in the date code field.  Beginning in
the year 2000, these date code files will need to accept four digit entries to
distinguish 21st century dates from 20th century dates.  While uncertainty
exists concerning the potential effects associated with such compliance, the
Company does not believe that year 2000 compliance will result in a material
adverse effect on its financial condition or results of operations.

NEW ACCOUNTING PRONOUNCEMENTS

         In March 1997, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standards ("SFAS") No.  128, Earnings Per
Share.  SFAS No. 128 is effective for financial statements issued after
December 15, 1997.  The Company has implemented SFAS No. 128.  SFAS No. 128
requires the dual presentation of basic and





                                       37
<PAGE>   40
diluted net loss per share.  Basic net loss per share includes no dilution and
is computed by dividing net loss available to common stockholders by the
weighted average number of common shares outstanding for the period.  Diluted
loss per share includes the potential dilution that could occur if securities
or other contracts to issue common stock were exercised or converted into
common stock.  Options, warrants and convertible securities that were
outstanding at the end of each period presented were not included in the
computation of diluted net loss per share as their effect would be
antidilutive.  As a result the basic and diluted loss per share amounts are
identical.

          In June 1997, the Financial Accounting Standards Board issued SFAS
No. 130, Reporting Comprehensive Income, SFAS No. 130 is effective for fiscal
years beginning after December 15, 1997.  SFAS No. 130 establishes standards
for reporting and display of comprehensive income and its components in
financial statements.  Management expects that foreign currency translation
adjustments will be the significant component of Comprehensive Income under
SFAS No. 130.

          In June 1997, the Financial Accounting Standards Board issued SFAS
No. 131, Disclosures about Segments of an Enterprise and Related Information.
SFAS No. 131 is effective for 1998 year-end financial statements.  SFAS No. 131
requires an enterprise to report certain additional financial and descriptive
information about its reportable operating segments.  Management does not
expect that the implementation of SFAS No. 131 disclosure will have a material
impact on the Company.





                                       38
<PAGE>   41
ITEM 8.  CONSOLIDATED FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.


INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
<TABLE>
<CAPTION>
                                                                                                     Pages
                                                                                                     -----
<S>                                                                                                   <C>
Report of Independent Public Accountants  . . . . . . . . . . . . . . . . . . . . . . . .             F-1

Consolidated Financial Statements:

         Consolidated Balance Sheets as of
            December 31, 1996 and 1997  . . . . . . . . . . . . . . . . . . . . . . . . .             F-2

         Consolidated Statements of Operations
            for the years ended December 31, 1995,
            1996 and 1997 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             F-3

         Consolidated Statements of Changes in
            Stockholders' Equity for the years
            ended December 31, 1995, 1996 and 1997  . . . . . . . . . . . . . . . . . . .             F-4

         Consolidated Statements of Cash Flows
            for the years ended December 31, 1995,
            1996 and 1997 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             F-5

Notes to Consolidated Financial Statements  . . . . . . . . . . . . . . . . . . . . . . .             F-6
</TABLE>


ITEM 9.  CHANGES IN AND DISAGREEMENTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

         None.





                                       39
<PAGE>   42
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To Oncor, Inc.:

We have audited the accompanying consolidated balance sheets of Oncor, Inc. (a
Maryland corporation) and subsidiaries as of December 31, 1996 and 1997, and
the related consolidated statements of operations, stockholders' equity and
cash flows for each of the three years in the period ended December 31, 1997.
These financial statements are the responsibility of the Company's management.
Our responsibility is to express an opinion on these financial statements based
on our audits.

We conducted our audits in accordance with generally accepted auditing
standards.  Those standards require that we plan and perform an audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatement.  An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements.  An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the financial position of Oncor, Inc. and subsidiaries
as of December 31, 1996 and 1997, and the results of their operations and their
cash flows for each of the three years in the period ended December 31, 1997,
in conformity with generally accepted accounting principles.

The accompanying financial statements have been prepared assuming that the
Company will continue as a going concern.  As discussed in Note 1 to the
financial statements, the Company has incurred significant losses and will
require additional financing to continue operations.  These factors raise
substantial doubt about its ability to continue as a going concern.
Management's plans in regard to these matters are also described in Note 1.
The financial statements do not include any adjustments that might result from
the outcome of this uncertainty.

                              ARTHUR ANDERSEN LLP

Washington, D.C.
February 20, 1998
(except with respect to the financial
condition of the Company described in
Note 1, and to the Vysis and Key
Technology matters described in Note 8,
as to which the date is April 30, 1998)





                                      F-1
<PAGE>   43
                                ONCOR, INC.

                        CONSOLIDATED BALANCE SHEETS
<TABLE>
<CAPTION>
                                                   As of December 31,   
                                             ---------------------------
                                                  1996           1997
                                                  ----           ----

                                  ASSETS
CURRENT ASSETS:
<S>                                         <C>             <C>       
  Cash and cash equivalents                   $13,058,657     $2,873,765
  Short-term investments, at market               388,504        110,547
  Restricted cash                               5,432,478      2,012,611
  Accounts receivable, net of allowance
    for doubtful accounts of approxi-     
    mately $372,000 and $419,000                2,401,639      2,028,239
  Receivable from Officer/Director                294,039        296,874
  Inventories                                   3,839,630      3,161,141
  Receivable from affiliates                      233,007         50,439
  Other current assets                            630,053      3,036,676
                                              ------------   ------------
    Total current assets                       26,278,007     13,570,292
                                              ------------   ------------

NON-CURRENT ASSETS:
  Property and equipment, net                   5,044,270      4,175,768
  Deposits and other non-current assets           216,035        397,801
  Investment in and advances to affiliates      3,213,548        856,064
  Intangible assets, net                        6,918,278      4,884,234
                                              ------------   ------------
    Total non-current assets                   15,392,131     10,313,867
                                              ------------   ------------

     Total assets                             $41,670,138    $23,884,159
                                              ============   ============

<CAPTION>
                   LIABILITIES AND STOCKHOLDERS' EQUITY

CURRENT LIABILITIES:                    
<S>                                         <C>             <C>       
  Accounts payable                             $2,523,585     $3,141,845
  Accrued expenses and other current
    liabilities                                 1,656,900      1,697,744
  Notes payable                                     -          3,013,131
  Affiliate stock issuable under warrants           -          3,787,500
  Current portion of long-term debt               719,337        551,242
                                              ------------   ------------
    Total current liabilities                   4,899,822     12,191,462
                                              ------------   ------------

NON-CURRENT LIABILITIES:
  Long-term debt                               10,386,110      5,867,079
  Deferred rent                                     -            259,351
                                              ------------   ------------
    Total non-current liabilities              10,386,110      6,126,430
                                              ------------   ------------
     Total liabilities                         15,285,932     18,317,892
                                              ------------   ------------

COMMITMENTS AND CONTINGENCIES         

MINORITY INTEREST IN CONSOLIDATED SUBSIDIARY    3,040,119      2,378,157
                                              ------------   ------------

STOCKHOLDERS' EQUITY:
  Preferred stock, $.01 par value, 1,000,000
    shares authorized, no shares issued             -               -
  Common stock, $.01 par value,
    50,000,000 shares authorized,
    24,214,349 and 27,302,384 issued;
    24,134,940 and 27,222,975 outstanding         242,143        273,024
  Common stock warrants outstanding               781,250        909,630
  Additional paid-in capital                  125,327,438    137,873,399
  Deferred compensation                          (641,270)      (879,020)
  Unrealized gain on investments                      (94)         -
  Cumulative translation adjustment              (508,172)    (2,184,342)
  Accumulated deficit                        (101,636,696)  (132,584,069)
  Less - 79,409 shares of common
    stock held in treasury, at cost              (220,512)      (220,512)
                                              ------------   -------------
    Total stockholders' equity                 23,344,087      3,188,110
                                              ------------   -------------

     Total liabilities and
     stockholders' equity                     $41,670,138    $23,884,159
                                              ============   =============
</TABLE>


  The accompanying notes are an integral part of these consolidated financial
                                  statements.


                                      F-2

<PAGE>   44

                                   ONCOR, INC.

                      CONSOLIDATED STATEMENTS OF OPERATIONS
<TABLE>
<CAPTION>
                                       Years Ended December 31,        
                             ---------------------------------------------
                                  1995            1996           1997    
                                  ----            ----           ----    
<S>                         <C>            <C>             <C>        
GROSS REVENUES:
  Product sales               $16,192,836    $15,323,167     $12,948,983
  Contract and grants           1,194,646        682,529         408,589  
                             ------------   ------------    ------------ 
  Gross revenues               17,387,482     16,005,696      13,357,572
                             ------------   ------------    ------------ 

OPERATING EXPENSES:
  Direct cost of sales          8,279,445      9,656,332       8,515,380
  Restructuring expense             -          2,075,000           -
  Amortization of 
   intangible assets            1,339,023      1,322,838       1,157,520
  Selling, general and    
   administrative              13,751,342     15,073,138      14,824,585
  Research and development      8,169,625      7,275,565       7,186,150
  Clinical and regulatory       2,252,505      2,545,791       2,045,828
                             ------------   ------------    ------------ 
  Total operating expenses     33,791,940     37,948,664      33,729,463
                             ------------   ------------    ------------ 

LOSS FROM OPERATIONS          (16,404,458)   (21,942,968)    (20,371,891)
                             ------------   ------------    ------------ 

OTHER INCOME (EXPENSE):
  Investment income             1,032,584        519,153         522,793
  Interest and other    
   expenses, net                 (501,410)    (3,125,344)     (6,846,804)
  Equity in net loss of  
   affiliates and
   minority interest           (2,356,453)    (4,431,015)     (4,251,471)
                             ------------   ------------    ------------ 
   Net other expense           (1,825,279)    (7,037,206)    (10,575,482)
                             ------------   ------------    ------------ 

      Net loss               ($18,229,737)  ($28,980,174)   ($30,947,373)
                             ============   ============    ============ 

BASIC AND DILUTED
NET LOSS PER SHARE                 ($0.87)        ($1.26)         ($1.21)
                             ============   ============    ============ 

WEIGHTED AVERAGE COMMON
  SHARES OUTSTANDING           20,887,873     23,030,793      25,546,557
                             ============   ============    ============ 
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.


                                     F-3
<PAGE>   45

                                   ONCOR, INC.


            CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY
              for the years ended December 31, 1995, 1996, and 1997


<TABLE>
<CAPTION>
                                                   Common      Unrealized
                              Common Stock          Stock         (Loss)    
                         ----------------------    Warrants       Gain On     
                            Shares      Amount   Outstanding   Investments   
                   -----------------------------------------------------------
<S>                      <C>          <C>         <C>           <C>           
BALANCE,           
DECEMBER 31, 1994          20,663,938   $206,639        -        ($1,948)      

 Sales of common
  stock                       768,384      7,684        -           -    

 Exercise of unit
  purchase options            118,315      1,183        -           - 

 Exercise of stock
  options and
  warrants                    192,431      1,925        -           -

 Net unrealized 
  holding gain on
  investments                   -          -            -          2,504

 Cumulative translation
  adjustment                    -          -            -           -        

 Net loss                       -          -            -           -     
                   -----------------------------------------------------------
BALANCE,
DECEMBER 31, 1995          21,743,068    217,431        -            556 

 Sales of common 
  stock of subsidiaries         -          -            -           -    
  and unconsolidated
  affiliates

 Issuance of common
  stock and warrants
  in connection with
  debt                      2,163,242     21,632       781,250      -    

 Exercise of stock
  options                     159,534      1,595       -            -    

 Issuance of common
  stock in connection
  with research and 
  development agreements      148,505      1,485       -            -    


 Issuance and amortization
  of non-employee stock
  options                       -          -           -            -    

 Cumulative translation
  adjustment                    -          -           -            -    

 Net unrealized holding
  gain on investments           -          -           -            (650)
 
 Net loss                       -          -           -            -    
                   -----------------------------------------------------------
BALANCE,
DECEMBER 31, 1996          24,214,349    242,143       781,250       (94)

 Sales of common stock        155,972      1,560       -            -     

 Sales of common stock of
 unconsolidated affiliate       -          -           -            -    

 Issuance of common
  stock and warrants
  in connection with
  debt                      2,888,088     28,881       128,380      -    

 Exercise of stock
  options                      43,975        440       -            -   

 Issuance and amortization
  of non-employee stock 
  and options                   -          -           -            -  

 Cumulative translation
  adjustment                    -          -           -            -  

 Net unrealized holding
  gain on investments           -          -           -              94

 Net loss                       -          -           -            -   
                   -----------------------------------------------------------
DECEMBER 31, 1997          27,302,384   $273,024      $909,630      -   
                   ===========================================================
</TABLE>

<TABLE>
<CAPTION>
                                        Cumulative    Additional
                         Deferred      Translation     Paid-In     
                       Compensation     Adjustment     Capital
                      ------------------------------------------------
<S>                    <C>            <C>           <C>
BALANCE,
DECEMBER 31, 1994              -         ($13,224)    $94,734,791 

 Sales of common
  stock                        -             -          2,801,800    

 Exercise of unit
  purchase options             -             -            172,433 

 Exercise of stock
  options and 
  warrants                     -             -            524,588   

 Net unrealized 
  holding gain on 
  investments                  -             -               -       

 Cumulative translation
  adjustment                   -          426,011            -     

 Net loss                      -             -               -  
                      ------------------------------------------------
BALANCE,
DECEMBER 31, 1995              -          412,787      98,233,612 

 Sales of common 
  stock of subsidiaries
  and unconsolidated
  affiliates                   -             -         12,428,145 

 Issuance of common
  stock and warrants
  in connection with
  debt                         -             -         12,802,185       

 Exercise of stock
  options                      -             -            666,940     

 Issuance of common
  stock in connection
  with research and 
  development agreements       -             -            460,619 

 Issuance and amortization
  of non-employee stock
  options                  (641,270)         -            735,937    

 Cumulative translation
  adjustment                   -         (920,959)           -

 Net unrealized holding
  gain on investments          -             -               -       

 Net loss                      -             -               -
                      ------------------------------------------------
BALANCE,
DECEMBER 31, 1996          (641,270)     (508,172)    125,327,438  

 Sales of common stock
  and warrants                 -             -            624,520      

 Sales of common 
  stock of unconsolidated  
  affiliates                   -             -            437,525      

 Issuance of common
  stock and warrants
  in connection with
  debt                         -             -         10,288,639   

 Exercise of stock
  options                      -             -             91,529

 Issuance and amortization
  of non-employee stock 
  and options              (237,750)         -          1,103,748 

 Cumulative translation
  adjustment                   -       (1,676,170)           -       

 Net unrealized holding
  gain on investments          -             -               -  

 Net loss                      -             -               -      
                      ------------------------------------------------
BALANCE,
DECEMBER 31, 1997         ($879,020)  ($2,184,342)   $137,873,399
                      ================================================
</TABLE>


<TABLE>
<CAPTION>
                                         Treasury Stock           
                         Accumulated  ------------------              
                           Deficit       Shares   Amount     Total  
                       --------------------------------------------------
<S>                     <C>             <C>     <C>        <C>
BALANCE,
DECEMBER 31, 1994         ($54,426,785)  79,409 ($220,512) $40,278,961

 Sales of common
  stock                           -        -         -       2,809,484

 Exercise of unit
  purchase options                -        -         -         173,616

 Exercise of stock
  options and 
  warrants                        -        -         -         526,513

 Net unrealized 
  holding gain on 
  investments                     -        -         -           2,504

 Cumulative translation
  adjustment                      -        -         -         426,011

 Net loss                  (18,229,737)    -         -     (18,229,737)
                    -------------------------------------------------
BALANCE,
DECEMBER 31, 1995          (72,656,522)  79,409  (220,512)  25,987,352

 Sales of common 
  stock of subsidiaries
  and unconsolidated
  affiliates                      -        -         -      12,428,145

 Issuance of common
  stock and warrants
  in connection with
  debt                            -        -         -      13,605,067

 Exercise of stock
  options                         -        -         -         668,535

 Issuance of common
  stock in connection
  with research and 
  development agreements          -        -         -         462,104

 Issuance and amortization
  of non-employee stock
  options                         -        -         -          94,667   

 Cumulative translation
  adjustment                      -        -         -        (920,959)

 Net unrealized holding
  gain on investments             -        -         -            (650)

 Net loss                  (28,980,174)    -         -     (28,980,174)                          
                         ------------------------------------------------
BALANCE,
DECEMBER 31, 1996         (101,636,696)  79,409  (220,512)  23,344,087

 Sales of common stock
  and warrants                    -        -         -         626,080

 Sales of common 
  stock of unconsolidated
  affiliates                      -        -         -         437,525

 Issuance of common
  stock and warrants
  in connection with
  debt                            -        -         -      10,445,900

 Exercise of stock
  options                         -        -         -          91,969

 Issuance and amortization
  of non-employee stock 
  and options                     -        -         -         865,998

 Cumulative translation
  adjustment                      -        -         -      (1,676,170)

 Net unrealized holding
  gain on investments             -        -         -              94

 Net loss                  (30,947,373)    -         -     (30,947,373)
                         ------------------------------------------------
BALANCE,
DECEMBER 31, 1997        ($132,584,069)  79,409 ($220,512)  $3,188,110 
                         ================================================
</TABLE>

 
  The accompanying notes are an integral part of these consolidated financial
                                  statements.

                                     F-4
<PAGE>   46
                                   ONCOR, INC.

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
<TABLE>                                                              
<CAPTION>
                                                     Years Ended December 31,   
                                            -------------------------------------------
                                                  1995          1996           1997
                                                  ----          ----           ----
<S>                                         <C>            <C>            <C>     
CASH FLOWS FROM OPERATING ACTIVITIES: 
  Net loss                                  ($18,229,737)  ($28,980,174)  ($30,947,373)
  Adjustments to reconcile net loss to
     net cash used in operating activities:
     Issuance of common stock for interest       
       and imputed interest on convertible
       notes                                       -          2,755,235      3,177,072
     Issuance of common stock warrants in
       stock of an affiliate as payment
       for interest                                -              -          1,825,962
     Depreciation and amortization             3,028,523      2,858,336      2,928,200
     Gain on disposal of assets                    -           (269,978)         -
     Non-cash product discontinuation              -          1,719,473          -
     Issuance of common stock in 
       connection with research and
       development agreements and 
       expenses for non-employee
       stock options                               -            556,771        865,998
     Equity in net loss of affiliate
       and minority interest                   2,409,027      4,431,005      4,251,471
     Changes in operating assets
       and liabilities:                     
       Accounts receivable                      (172,618)     1,434,837        227,605
       Inventories                              (847,473)     1,468,239        348,752
       Other current assets                     (593,076)       269,912       (649,923)
       Deposits and other non-current assets      25,176          1,776         85,331
       Accounts payable                          705,260       (937,002)       332,048
       Accrued expenses and other
         current liabilities                     (59,360)      (134,451)     1,684,984
       Deferred rent                             (72,858)       (18,223)       259,351
         Net cash used in operating         -------------------------------------------
           activities                        (13,807,136)   (14,844,244)   (15,610,522)
                                            -------------------------------------------

CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property and equipment         (3,127,285)      (630,594)      (743,844)  
  Disposals of property and equipment              -            393,194          -
  Acquisitions of businesses (Note 3)           (194,420)         -              -
  Currency protection in Appligene
    agreement                                      -            (44,423)         -
  Purchase of stock in affiliate                   -           (300,000)         -
  Redemptions of investments                  11,973,499        671,733        278,051
         Net cash provided by (used         -------------------------------------------
          in) investing activities             8,651,794         89,910       (465,793)
                                            -------------------------------------------
   
CASH FLOWS FROM FINANCING ACTIVITIES:   
  Net proceeds from sale of common stock       2,809,484          -            626,080
  Proceeds from sales of stock of subsidiary   3,034,503      9,099,364          -
  Offering costs of private placement              -            (54,100)         -
  Exercise of stock options                      700,129        668,535         91,969
  Change in restricted funds                       -         (5,432,478)     3,394,895
  Loan to unconsolidated affiliate                 -              -         (1,709,321)   
  Payment on notes for acquisitions           (2,990,507)    (1,764,636)         -
  Payment on bank loans                       (1,169,381)      (884,919)      (684,725)
  Proceeds from line of credit                     -              -          3,000,000
  Proceeds from issuance of convertible
    debt and warrants                          7,366,482     13,207,410      2,052,226
         Net cash provided by financing     -------------------------------------------
          activities                           9,750,710     14,839,176      6,771,124
                                            -------------------------------------------
                                                                
EFFECT OF CHANGE IN EXCHANGE RATE           -------------------------------------------
  ON CASH                                        (95,354)      (485,080)      (879,701)
                                            -------------------------------------------

  Net increase (decrease) in cash and     
    cash equivalents                           4,500,014       (400,238)   (10,184,892) 

CASH AND CASH EQUIVALENTS, beginning of 
  the period                                   9,749,911     13,458,895     13,058,657
                                            -------------------------------------------
CASH AND CASH EQUIVALENTS, end of the
  period                                     $14,249,925    $13,058,657     $2,873,765
                                            =========================================== 

SUPPLEMENTAL DISCLOSURE OF CASH FLOW
  INFORMATION:
  Cash paid during the year for interest        $389,842       $251,892       $144,276
</TABLE>

  The accompanying notes are an integral part of these consolidated financial
                                  statements.

                                     F - 5
<PAGE>   47
                                  ONCOR, INC.
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                            AS OF DECEMBER 31, 1997


(1)      ORGANIZATION, PRINCIPLES OF CONSOLIDATION AND CERTAIN
         ELEMENTS OF RISK

         Nature of Organization

         Oncor, Inc. (together with its consolidated subsidiaries, hereinafter
the "Company" or "Oncor") develops and markets gene-based test systems and
related products for use in the management of cancer, including risk
assessment, detection, treatment selection and monitoring.  In addition to its
gene-based test systems, the Company currently manufactures and markets over
200 genetic probes to specific human genes, with related reagents and
instrumentation, for research purposes.  The Company also produces and markets
molecular biology products.  The Company currently sells its products to over
1,700 customers world-wide.

         Principles of Consolidation

         The consolidated financial statements include the accounts of Oncor,
Inc. and all subsidiaries.  All significant intercompany accounts and
transactions have been eliminated in consolidation.  The Company records
investments in affiliates owned more than 20%, but not in excess of 50%, using
the equity method.  Changes in the Company's proportionate share of
subsidiaries or affiliate's equity resulting from common stock issuances of
subsidiaries and investments in affiliates are credited to equity.

         Significant Risks and Uncertainties

         The following factors may affect the Company's ability to continue as
a going concern.  The financial statements do not include any adjustments that
might result from the outcome of this uncertainty.

         The Company has incurred significant cash losses throughout its
existence and has no immediate expectation to achieve cash positive operations.
Through December 31, 1997, the Company has incurred cumulative losses totaling
approximately $133 million.  The Company's current cash resources are nearly
depleted and any cash infusions would likely be required to be utilized first
to repay bank debt obligations of $3.5 million.

         The consolidated cash and liquid investments balances of the Company
were $4.6 million at March 31, 1998, compared to $5.0 million at December 31,
1997.  Approximately $2.8 million of the cash and liquid investments at 
March 31, 1998 are limited to fund operations of the Company's European





                                      F-6
<PAGE>   48
subsidiary.  Liquid investments include restricted cash, cash equivalents and
short-term investments as set forth on the consolidated balance sheet.

         Approximately $1.0 million of the cash and liquid investments is held
in escrow in France pending the outcome of legal disputes between the Company
and the former President of Appligene.  Such disputes are scheduled to be
adjudicated in the second quarter of 1998.

         In January 1998, the Company completed a $5 million equity financing
in a private placement of 500 shares of Series A preferred stock, which are
convertible into Common Stock.

         Operations of the Company continue to be subject to certain risks and
uncertainties including, among others, uncertainties relating to  development,
significant operating losses, competition, technological uncertainty, reliance
on patents and proprietary rights, dependence on key personnel, governmental
regulations and legislation and the availability of additional capital.
Consequently, there can be no assurance that future operations will show any
significant improvement over past results.

         The planned divestiture of certain non-strategic assets and other
cost-cutting actions, which are expected to be completed by June 30, 1998, are
expected to reduce the Company's ongoing cash requirements significantly.  In
April 1998, the Company's line of credit was increased by $500,000 to $3.5
million which the Company has fully drawn down.  The Company is negotiating an
increase in the line of credit to $4.0 million.

         The Company is considering additional alternative forms of financing,
including among other things, (1) equity or debt financing, (2) sale of
significant assets, including its nonstrategic research products business unit,
which may result from the previously announced retention of Lehman Brothers by
the Company to explore strategic alternatives to increase stockholder value,
including sale of the Company, (3) sale of publicly-traded Oncormed common
stock, (4) third party funding of Codon for future cash requirements and
recovery of Oncor advances to Codon and (5) other alternatives.  After the
acquisition of Codon, Oncor includes in its consolidated cash position any
amounts raised through the separate financing efforts of Codon.  Funds, if any,
raised from most of these possible sources must first be utilized to repay, in
whole or in part, the Company's bank debt of $3.5 million in accordance with
the terms of the underlying line of credit and related guarantees.

         The Company holds 2.0 million shares of common stock in Oncormed,
Inc., a publicly traded affiliate of the Company, whose shares have traded in
the first quarter of 1998 in the range of $4.75 to $7.50 per share.  The
Company is restricted from selling 1.0 million such shares in the public
markets due to outstanding options it has issued or anticipates issuing
pursuant to which the Company has offered to sell the shares to the option





                                      F-7
<PAGE>   49
holders for $2.00 per share.  While exercise of such options would generate
cash of approximately $2.0 million, such exercise is outside the control of the
Company.  The remaining 1.0 million shares of common stock of Oncormed can be
sold in the public markets only pursuant to restrictions such that the complete
liquidation of this position in the public markets likely would take a year or
more.  Trading activity in Oncormed stock is limited, which would further
restrict the Company's ability to liquidate a significant portion of its
position.  The Company is also considering attempting to secure a purchaser for
a block of the stock in a private transaction and currently is holding
discussions with potential purchasers pursuant to this effort.

         In April 1998, two of the alternative forms of financing, which the
Company had previously reported as being in more advanced stages for
discussions, subsequently were not converted from the term sheet stage to that
of definitive agreements.  The Company continues actively to pursue similar
transactions with other parties.

         There can be no assurance that any of the alternatives discussed
above, or any other such forms of financing, can be completed by the Company in
sufficient amounts in timely fashion on acceptable terms, or at all, which
would have a material adverse effect on the Company.  Even if completed, each
of such financing alternatives may have certain terms, conditions or
ramifications which may have a material adverse effect on the Company's
business, financial condition and results of operations.  For instance, any
such equity financings likely will be dilutive to stockholders; the terms of
any debt financing, as does the existing line of credit, may require
substantially all of the assets of the Company to be pledged as collateral, may
involve warrant or equity dilution and/or may contain restrictive covenants
which limit the Company's ability to pursue certain courses of action; and the
sale of assets will decrease the revenue base of the Company.

         In the event that the Company is unable to raise additional capital by
the end of May 1998, the Company may promptly cease significant portions of its
programs, projects and business operations.  If the pursuit of these potential
funding sources proves largely unsuccessful, the Company may be forced into the
complete termination of its business operations.

         Concentrations of Credit Risk

         The Company and its customers are directly affected by the well being
of the health care industry world-wide.  Concentrations of credit risk with
respect to receivables is generally limited due to the large number of
customers in the Company's customer base.  The Company maintains an allowance
for doubtful accounts based upon its expectation of the proportion of its
receivables it will not able to collect.  With respect to its investments, it
is the policy of the Company to invest only in publicly traded, investment
grade, fixed income securities with minimal exposure to foreign currency risk.
The Company does not invest in derivative securities.





                                      F-8
<PAGE>   50
         Due to the Company's operations in currencies other than the U.S.
dollar, the Company is subject to foreign currency risk.  At December 31, 1997,
approximately $4.6 million of the Company's current assets were denominated in
currencies other than U.S.  dollar.  These current assets consisted of $2.4
million in cash, $1.0 million in restricted cash and $1.2 million in accounts
receivable.


(2)      SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

         Management's Use of Estimates

         The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities at the
date of the financial statements and the reported amounts of revenues and
expenses during the reporting period.  Reserves have been recorded for
estimates of uncollectible accounts receivable and excess and obsolete
inventory.  Management also uses estimates to determine the estimated lives of
its intangible and tangible assets.  Actual results could differ from those
estimates.

         Fair Value of Financial Instruments

         Cash, accounts receivable, accounts payable, accrued liabilities and
short-term borrowings, as reflected in the financial statements, approximate
fair value because of the short-term maturity of those instruments.  Affiliate
stock issued under warrants is recorded at fair value based upon a valuation
model.  It was not practicable to estimate the fair value of the Company's
long-term debt because quoted market prices do not exist and no rates are
currently available to the Company for loans with similar terms or maturities.

         Impairment of Long-Lived Assets

         The Company complies with Statement of Financial Accounting Standards
("SFAS") No. 121, Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to Be Disposed of.  The Company reviews its long-lived
assets, including identifiable intangibles; goodwill; and property, plant and
equipment, for impairment whenever events or changes in circumstances indicate
that the carrying amount of the assets may not be fully recoverable.  To
determine recoverability of its long-lived assets, the Company evaluates that
future undiscounted net cash flows will be less than the carrying amount of the
assets.  Impairment is measured as the difference between carrying cost and
fair market value.

         Cash Equivalents and Investments

         Cash equivalents and investments at December 31, 1996 and 1997,
consist primarily of funds invested in money market instruments and commercial
paper.  Investments with maturities between three months and one year are
classified as short-term investments.





                                      F-9
<PAGE>   51
Investments in securities with original maturities of less than three months
are considered cash equivalents.  Approximately $1.0 million in restricted cash
was pledged as collateral for a loan of an officer and director until February
1998 at which time it was reduced to approximately $0.2 million.  Cash of
approximately another $1.0 million is held in escrow pursuant to a lawsuit
brought by a former employee in France.

         The Company accounts for investments in accordance with SFAS No. 115,
Accounting for Certain Investments in Debt and Equity Securities.  All
investments are classified as available-for-sale securities and, accordingly,
carried at fair market value.  Unrealized holding gains and losses are excluded
from earnings and reported as a net amount in a separate component of
shareholders' equity until realized.  In computing gains and losses, costs are
determined on the basis of specific identification.

         Revenue Recognition

         The Company generally recognizes revenue from sales when the related
goods are shipped.  Grant and contract revenues are recognized on a
percentage-of-completion basis.  Grant revenues are reported when earned and
are not refundable in accordance with the provisions of the grant awards.

         Foreign Currency Translation

         In September 1994, the Company acquired an operation in France (see
Notes 3 and 9) for which the functional currency is the French franc ("FF").
Assets and liabilities for the operation have been translated into U.S. dollars
using the exchange rates in effect on the respective balance sheet dates.
Revenues and expenses have been translated using the average exchange rate
during the periods presented.  Cumulative translation losses of $0.5 million
and $2.2 million at December 31, 1996 and 1997, respectively, have been
excluded in determining the results of operations and have been accumulated as
a separate component of equity.

         Income Taxes

         The Company files a consolidated U.S. federal income tax return for
the parent and all U.S. subsidiaries in which its ownership exceeds 80%.  The
Company files separate income tax returns in France for its French
subsidiaries.

         The Company accounts for its income taxes in accordance with SFAS No.
109, Accounting for Income Taxes.

         With respect to U.S. federal income tax, as of December 31, 1997 the
Company has net operating loss carry-forwards ("NOLs") of approximately $100.7
million available to offset future taxable income.  The Company also has
research and development tax credits of approximately $1.6 million available to
reduce future U.S. federal income tax.  The tax NOL





                                      F-10
<PAGE>   52
and research and development tax credits may be used through 2010, but begin to
expire in 1998.  Despite the NOL and credit carry-forwards, the Company may
have an income tax liability in future years due to the application of the
alternative minimum tax rules.  In addition, the utilization of these tax NOL
and credit carry-forwards is subject to statutory limitations regarding changes
in ownership.  The French company had accumulated capital loss and tax loss
carryforwards of approximately 43.7 million French francs and research and
development tax credits of approximately 1.1 million French francs at December
31, 1997.

         SFAS No. 109 requires that the tax benefit of financial reporting NOLs
and tax credits be recorded as an asset to the extent that management assesses
the utilization of such NOLs and tax credits to be "more likely than not."  As
of December 31, 1997, the Company's net deferred tax assets in the United
States and France, the only material element of which is net operating loss
carryforwards, were approximately $41.9 million and $2.0 million, respectively,
at December 31, 1997 and $34.2 million and $1.6 million at December 31, 1996,
respectively.  A valuation reserve was recorded against the entire amount of
both net deferred tax assets, since the Company has incurred operating losses
in the United States since inception and in France on a recent basis.  The net
deferred tax assets are primarily attributable to net operating losses, capital
losses and tax credits.





                                      F-11
<PAGE>   53
         Net operating losses and research and development tax credits expire
as follows.

<TABLE>
<CAPTION>
                       United States                                              France
- --------------------------------------------------------------------------------------------------------------
                                            Research and                                      Research and
      Year of                                Development        Year of                        Development
    Expiration              NOL               Tax Credits      Expiration         NOL           Tax Credits
  --------------       ---------------     ----------------   ------------     ---------   -------------------
                              (in United States dollars)                                 (in French francs)
       <S>               <C>                  <C>             <C>            <C>                 <C>
       1998                  $167,000             5,000           1998               --             88,000

       1999                   315,000            23,000           1999               --                 --

       2000                   372,000            27,000           2000          736,000            550,000

       2001                   848,000            41,000           2001       14,275,000            442,000

       2002                 1,747,000            78,000           2002       16,814,000                 --

       2003                 1,807,000           100,000       Indefinitely   11,881,000                 --

       2004                 1,705,000                 0

       2005                 2,538,000            51,000

       2006                 4,991,000            99,000

       2007                11,137,000           175,000

       2008                10,707,000           301,000

       2009                14,789,000           307,000

       2010                11,782,000           103,000

       2011                19,856,000           154,000

       2012                17,939,000           136,000
                           ----------           -------

       Total             $100,700,000         1,600,000       Total          43,706,000          1,080,000
                         ============         =========                      ==========          =========
</TABLE>


The Company's net loss related to foreign and domestic operations was $4.0
million and $26.9 million, respectively in 1997; $2.8 million and $26.2 million
respectively in 1996; and $0.9 million and $17.3 million in 1995, respectively.

         Research and Development Costs

         Expenditures for research and development activities are charged to
expense as incurred.                    





                                      F-12
<PAGE>   54
         Basic and Diluted Net Loss Per Share

         In March 1997, the Financial Accounting Standards Board issued
Statement of Financial Accounting Standards ("SFAS") No.  128, Earnings Per
Share.  SFAS No. 128 is effective for financial statements issued after
December 15, 1997.  The Company has implemented SFAS No. 128.  SFAS No. 128
requires the dual presentation of basic and diluted net loss per share.  Basic
net loss per share includes no dilution and is computed by dividing net loss
available to common stockholders by the weighted average number of common
shares outstanding for the period.  Diluted loss per share includes the
potential dilution that could occur if securities or other contracts to issue
common stock were exercised or converted into common stock.  Options, warrants
and convertible securities that were outstanding at the end of each period
presented were not included in the computation of diluted net loss per share as
their effect would be antidilutive.  As a result the basic and diluted loss per
share amounts are identical.

         New Accounting Pronouncements

         In June 1997, the Financial Accounting Standards Board issued SFAS No.
130, Reporting Comprehensive Income, SFAS No. 130 is effective for fiscal years
beginning after December 15, 1997.  SFAS No. 130 establishes standards for
reporting and display of comprehensive income and its components in financial
statements.  Management expects that foreign currency translation adjustments
will be the significant component of Comprehensive Income under SFAS No. 130.

         In June 1997, the Financial Accounting Standards Board issued SFAS No.
131, Disclosures about Segments of an Enterprise and Related Information.  SFAS
No. 131 is effective for 1998 year-end financial statements.  SFAS No. 131
requires an enterprise to report certain additional financial and descriptive
information about its reportable operating segments.  Management does not
expect that the implementation of SFAS No. 131 disclosure will have a material
impact on the Company.


(3)      MERGERS AND ACQUISITIONS

         Acquisition of Appligene S.A.

         In September 1994, Oncor acquired 98.5% of the outstanding capital
stock of Appligene S.A., a French societe anonyme, ("Appligene").  Appligene is
a developer, manufacturer and marketer of molecular genetic products and is
based in Strasbourg, France.  The transaction was accounted for as a purchase
and the costs allocated to intangible assets acquired in the acquisition are
being amortized on a straight line method over periods of 5 to 10 years, with a
weighted average amortization period of 8 years.  Intangible assets include the
estimated values of employment contracts, patents and licenses, and goodwill.





                                      F-13
<PAGE>   55
(4)      RESTRUCTURING EXPENSE

         In 1996, the Company adopted a restructuring plan to discontinue the
development, manufacture, sale and support of certain imaging, research, and
non-oncology genetics products.  Recorded restructuring costs of $2.1 million
comprise the charge-off of discontinued products, charge-off of goodwill
associated with a related business unit, and severance payments to former
employees whose employment was terminated in conjunction with the plan.  The
discontinued product lines were customized, computerized, microscopic imaging
systems, certain gene-based DNA probes chemistries and certain other chemical
test kits and components.  The related charge was incurred in conjunction with
the Company's decision to cease field sales and support for these lines.


(5)      TRANSACTIONS INVOLVING SUBSIDIARY AND AFFILIATED COMPANIES

         Oncormed, Inc.

         In 1994, the Company and Oncormed entered into a license agreement
pursuant to which Oncormed has a worldwide license to those of Oncor's existing
and future human genome technologies which are useful for the purposes of
development and commercialization of Oncormed's services.  This agreement is
subject to rights retained by the Company to use the licensed technologies for
development and commercialization of Oncor's products, which may then be sold
to Oncormed and to third parties.  Under this agreement, Oncormed is obligated
to pay royalties semi-annually equal to the greater of 6% of Oncormed's related
revenues or $100,000.  In February 1997, the terms of the license agreement
were amended on a prospective basis to, among other things, broaden the basis
of the payments to be made to Oncor, and reduce the minimum payment rates to
$25,000 per quarter beginning in the second quarter of 1998.

         From the period of inception of Oncormed until June 6, 1994, the
Company advanced funds to Oncormed, the balance of which was converted to a
term note due in June 1999 in the principal amount of $715,751 which bears
interest at the rate of 7% per year.  The note is recorded as a note receivable
from unconsolidated affiliate and included in investments and advances to
affiliates in the consolidated balance sheet at December 31, 1996 and 1997.
Also included in this balance at December 31, 1996 and 1997, is a balance of
$109,854 and $50,439, respectively, which is due from Oncormed, a majority of
which represents royalties receivable under the license agreement.

         In October 1994, Oncormed completed an initial public offering of
1,335,000 shares of its common stock at $6.00 per share.  In November 1994, the
Underwriter exercised the over-allotment option to purchase an additional
200,250 shares at $6.00 per share.  The effect of this transaction was to
reduce the Company's ownership interest in Oncormed from 83% to approximately
40%.  As the Company's voting interest was thereafter less than 50%,





                                      F-14
<PAGE>   56
the Company has since accounted for its investment in Oncormed using the equity
method of accounting.  In February 1996, Oncormed completed a public offering
of 2,000,000 shares of its common stock at $7.75 per share.  The effect of this
transaction was to reduce the Company's ownership interest in Oncormed to
approximately 29%.  The public offering resulted in an increase in the
Company's proportionate share of Oncormed's equity which was recorded as an
increase to the Company's investment in Oncormed and in its paid-in-capital of
approximately $4.0 million.  In February 1997, Incyte Pharmaceuticals, Inc.
granted Oncormed a non-exclusive license.  In consideration for the grant of
the license and $3.0 million cash, Oncormed issued 773,588 shares of common
stock and a warrant to purchase up to ten percent of Oncormed's outstanding
stock at the date of the warrant's exercise.  The effect of this transaction
was to reduce the Company's ownership interest in Oncormed to approximately 25%
and an increase the Company's proportionate share of Oncormed's equity which
was recorded as an increase to the Company's investment in Oncormed and its
paid-in capital.

         Summarized financial information of Oncormed is as follows:

<TABLE>
<CAPTION>
                                                   1995                  1996                    1997
                                           -------------------      ------------------     -------------------
<S>                                           <C>                    <C>                    <C>
Condensed Statement of Income
        Net Sales                                $311,387               $627,390                $959,645
        Operating Loss                         (6,686,134)            (7,915,717)            (10,974,088)
        Net Loss                              $(6,510,547)           $(7,455,973)           $(10,746,329)

Condensed Balance Sheet
        Current Assets                           $931,122             $7,934,124              $2,052,363
        Non-current Assets                      1,520,752              1,179,851               1,124,252

        Current liabilities                     1,331,806              1,444,762               1,775,458
        Non-current liabilities                   726,261                719,334                 724,347
        Shareholders' equity                     $393,807             $6,949,879                $676,810
</TABLE>


         The Company holds 2.0 million shares of common stock in Oncormed,
Inc., a publicly traded affiliate of the Company, whose shares have traded in
the first quarter of 1998 in the range of $4.75 to $7.50 per share.  The
Company is restricted from selling 1.0 million such shares in the public
markets due to outstanding options it has issued or anticipates issuing
pursuant to which the Company has offered to sell the shares to the option
holders for $2.00 per share (see Note 11).  While exercise of such options
would generate cash of approximately $2.0 million, such exercise is outside the
control of the Company.  The remaining 1.0 million shares of common stock of
Oncormed can be sold in the public markets only pursuant to restrictions such
that the complete liquidation of this position in the public markets likely
would take a year or more.  Trading activity in Oncormed stock is limited,
which would further restrict the Company's ability to liquidate a significant
portion of its position.





                                      F-15
<PAGE>   57
         Codon Pharmaceuticals, Inc.

         In June 1994, the Company formed and incorporated Codon
Pharmaceuticals, Inc. ("Codon"), formerly known as OncorPharm, Inc., to develop
and commercialize the therapeutic application of Oncor's technologies in the
field of genetic repair and certain other technologies.  The Chief Executive
Officer of the Company is the Chairman of the Board of Directors of Codon.  The
Company contributed $1.0 million in exchange for 2,000,000 shares of Codon
common stock.  During the remainder of 1994, the Company advanced funds
aggregating approximately $0.6 million to Codon to augment its working capital.
Codon performed research services for the Company which reduced its obligations
pursuant to the advances.  In December 1994, the balance of the advances was
converted into a note which was convertible into the common stock of Codon at a
rate of $2.00 principal amount for each share of common stock.  This note was
converted into 316,251 shares of common stock in 1995.

         In December 1994, Codon issued an aggregate of 450,000 shares of
common stock to certain members of its board of directors at $.50 per share.
In February through May 1995, Codon issued an aggregate of 140,000 shares of
common stock at $.50 per share and in April 1995, completed a private placement
of 1,500,000 shares of convertible preferred stock at $2.00 per share.  On
April 2, 1996, Codon completed a private placement of 1,012,667 of its
preferred shares of stock at $3.00 per share.  The Company purchased 100,000
shares in this second private placement.  The effect of these transactions was
to reduce the Company's ownership interest in Codon to approximately 42%.  As
the Company's voting interest was less than 50%, the Company has since
accounted for its investment in Codon using the equity method of accounting.
The effect of these transactions was to change the Company's proportionate
share of Codon's equity which was recorded as a $3.0 million increase to
paid-in capital.  The financial statements of the Company for the year ended
December 31, 1996 have been retroactively adjusted to record the results of
Codon pursuant to the equity method of accounting from January 1, 1996.  The
restatement had no impact on the Company's consolidated net loss or net loss
per share.  Included in receivable from affiliates at December 31, 1996 is
approximately $123,000 due from Codon.

         Effective February 28, 1998, the Company exchanged approximately 1.65
million shares of its common stock for all the outstanding shares of Codon not
held by the Company.  The effect of this transaction was to increase the
Company's ownership of Codon to 100%.  This transaction has been accounted for
as a purchase.  Of the purchase price of approximately $6.2 million, $5.7
million has been allocated to research and development projects in process and
expensed in the first quarter of 1998.  As a result of this transaction, all of
Codon's operating expenses and losses have been and will continue to be
included in the operating results of the Company from the effective date of the
acquisition.  The Company henceforth will include in its consolidated cash
position any amounts raised through the separate financing activities of Codon.





                                      F-16
<PAGE>   58
         Codon is presently seeking additional funding from other sources to
continue its research efforts.  Thus far, such efforts have not been successful
and there can be no assurance that such funding will be available or that Codon
will be successful in developing or commercializing any therapies or products.

         Summarized financial information of Codon for the period of equity
accounting is as follows:

<TABLE>
<CAPTION>
                                                                1996                         1997
                                                       -------------------------   -------------------------
         <S>                                                <C>                      <C>
         Condensed Statement of Income
                  Net Sales                                    $  -0-                   $    -0-
                  Operating Loss                                (4,033,733)              (3,433,610)
                  Net Loss                                     $(4,222,904)             $(3,354,285)

         Condensed Balance Sheet
                  Current Assets                               $   448,255              $    50,268
                  Non-current Assets                             1,434,677                1,180,393

                  Current liabilities                              392,604                1,557,803
                  Non-current liabilities                          123,037                1,652,424
                  Shareholders' equity                         $ 1,367,291              $(1,979,566)
</TABLE>


         Appligene Oncor S.A.

         In July 1996, Appligene Oncor S.A. ("Appligene"), the European
subsidiary of the Company, completed an initial public offering of newly issued
common shares for approximately $8.6 million.  As a result of this transaction,
the Company's equity interest in Appligene was reduced to approximately 80% and
the Company's proportionate share of Appligene's equity was increased by $5.4
million, which was recorded as an increase to the Company's paid-in capital.

(6)      RESEARCH, DEVELOPMENT AND LICENSING AGREEMENTS

         Johns Hopkins Collaborative Research Agreement

         In October 1992, the Company entered into a joint Collaborative
Research Agreement for the discovery and commercialization of new genetic
technologies for the detection of cancer with The Johns Hopkins University
School of Medicine ("Johns Hopkins").  The Company paid $0.4 million in 1995,
$0.5 million in 1996, and $0.5 million in 1997 under the agreement which
expires in December 1998.





                                      F-17
<PAGE>   59
(7)      STOCKHOLDERS' EQUITY

         Subsequent Event for Issuance of Preferred Stock

         The Company is authorized to issue up to 1,000,000 shares of Preferred
Stock (par value of $.01 per share).  The rights of any Preferred Stock
ultimately issued will be determined by the Board of Directors upon issuance.
In January 1998, the Company completed a $5 million equity financing in a
private placement of 500 shares of Series A preferred stock.  The preferred
stock is convertible into common stock of the Company under certain
circumstances, generally in a period beginning after 90 days, at prices equal
to the lower of (i) 100% (reducing over time to 90%) of the average of the
lowest closing bid price of the common stock on any two of the most recent 22
trading days preceding the date of conversion and (ii) $4.56.  In addition, the
Company issued warrants to purchase 125,000 shares of common stock in
connection with the transaction, with an exercise price of $5.16 per share.
The investors and the Company each have rights to increase the amount of the
investment under certain circumstances. The market value of the common stock on
the date of issuance of the preferred stock was $4.75.

         The Company will record as a deduction in determining net income or
loss attributable to common shareholder the difference between the conversion
price and the quoted price of the stock issuable upon conversion of the
preferred stock (the "beneficial conversion feature").  The beneficial
conversion is treated as a dividend and recorded on a straight line basis, over
the minimum holding period of the issuance of the preferred stock pursuant to
which the maximum beneficial conversion feature is earned.

         Common Stock, Convertible Notes and Warrants

         On December 30, 1996, the Company completed a private placement of 6%
five-year unsecured notes convertible into shares of Common Stock of the
Company and warrants to purchase an aggregate of 250,000 shares of the
Company's Common Stock.  The Company received total proceeds of approximately
$10.0 million of which $0.4 million was allocated to the warrants.  Issuance
costs were not significant.  The notes are immediately convertible at the
option of the holder and will be automatically converted upon maturity.  The
notes are convertible at the lesser of $5.00 per share or 80.0% of the market
value of the Common Stock at the time of conversion over a period of
approximately five months.  As of December 31, 1997, the balance of convertible
notes outstanding was approximately $4.7 million.

         On September 30, 1996, the Company completed a private placement of 6%
three-year unsecured notes convertible into shares of Common Stock of the
Company and warrants to purchase an aggregate of 250,000 shares of the
Company's Common Stock.  The Company received total proceeds of $5.0 million of
which $0.4 million was allocated to the warrants.  Issuance costs were not
significant.  As of December 31, 1997, all of these notes had been converted.
These notes were convertible at prices which declined from 100% to





                                      F-18
<PAGE>   60
80% of the market value of the common stock at the time of conversion over a
period of approximately 5 months.

         In December 1995, the Company completed a private placement of 768,384
shares of its Common Stock and issued convertible 4.5% unsecured notes payable
of $7.0 million.  Total proceeds, net of issuance costs were approximately $9.3
million.  As of December 31, 1996, all these notes had been converted.  These
notes were convertible at prices which declined from 100% to 80.5% of the
market value of the common stock at the time of conversion over a period of
approximately 5 months.

         On all convertible debt instruments with beneficial conversion
features, the Company records as interest expense the difference between the
conversion price and the quoted price of the stock issuable upon conversion of
convertible debentures with a fixed conversion benefit.  This imputed interest
is recorded over the minimum holding periods of the debentures pursuant to which
the maximum beneficial conversion feature is earned.  The interest expense
recorded in 1996 and 1997 pursuant to this accounting convention is
approximately $2.6 million and $3.0 million, respectively.

         In January and September of 1996 and in February of 1997 and February
of 1998, the Company filed registration statements on Form S-3 with the
Securities and Exchange Commission covering the sale of up to 4,455,510,
4,631,495, 4,907,645 and 5,587,965 shares, respectively, of Common Stock held
by third party shareholders or issuable under certain contractual conditions,
including shares issuable on exercise of certain options and warrants and the
conversion of certain notes payable.  Generally, the registration statements
will remain effective for up to three to five years.

         Stock Options

         The Company maintains a Stock Option Plan which was approved by the
Board of Directors in March 1992 (the "1992 Stock Option Plan"), which
incorporated the Company's former Incentive Stock Option Plan, Non-Qualified
Stock Option Plan and Non-Qualified Stock Option Plan for Non-Employee
Directors.

         The aggregate number of shares available for issuance under the 1992
Stock Option Plan may not exceed 5,015,604 shares of Common Stock, subject to
adjustment from time to time in the event of certain changes to the Company's
capital structure.

         On May 23, 1997, the Board of Directors authorized a regrant program
(the "1997 Regrant Program") which allowed active current option holders,
excluding executive officers, to forego earned vesting and elect to exchange
all or some of their outstanding options, ranging in exercise price from $4.125
to $7.50 per share, for new options under the Company's 1992 Stock Option Plan,
to purchase shares of the common stock at a new price of $3.625, the closing
price on May 23, 1997, the regrant date under the 1997 Regrant Program.
Options to purchase approximately 462,000 shares of common stock were





                                      F-19
<PAGE>   61
canceled and regranted.  Stock options that were regranted began vesting over a
four year period measured from May 23, 1997.

         The Company accounts for this plan under APB Opinion No. 25, under
which no compensation cost has been recognized.  Had compensation cost for
these plans been determined consistent with FASB Statement No. 123 (the
"Statement"), the Company's net income and earnings per share would have been
reduced to the following pro forma amounts:

<TABLE>
<CAPTION>
                                                        1995               1996              1997
                                                        ----               ----              ----
         <S>                     <C>               <C>                <C>               <C>
         Net Loss:               As Reported       ($18,229,737)      ($28,980,174)     ($30,947,373)

                                 Pro Forma         ($18,664,502)      ($30,544,795)     ($32,813,548)


         Net Loss Per Share:     As Reported           ($0.87)            ($1.26)           ($1.21)

                                 Pro Forma             ($0.89)            ($1.33)           ($1.28)
</TABLE>


Because the method of accounting promulgated by the Statement has not been
applied to options granted prior to January 1, 1995, the resulting pro forma
compensation cost may not be representative of that to be expected on a pro
forma basis in future years.

         The fair market value of each option grant is estimated using the
Black-Scholes option pricing model with the following assumptions used for
grants in 1995, 1996 and 1997: risk-free interest rates of 4 percent, 4 percent
and 5 percent, respectively; expected lives of 5.9 years for the options; and
expected volatility of 56 percent.





                                      F-20
<PAGE>   62
         Transactions relating to the Company's stock option plans are as
follows:


<TABLE>
<CAPTION>
                                             1992 Stock Option Plan                   Special Stock Options
                                       ------------------------------------     -----------------------------------
                                         Number of          Weighted Avg.         Number of         Weighted Avg.
                                           Shares             Ex. Price             Shares            Ex. Price
 <S>                                         <C>                <C>                    <C>              <C>
 Balance, December 31, 1994                 2,265,302           $5.0418                549,851          $2.7206

          Granted                           1,403,000            4.6600                 15,000           4.0000

          Exercised                           (93,668)           4.0900                (98,763)          1.7400

          Canceled                           (165,264)           4.8600                (61,737)          3.9200
                                        ---------------    ---------------      ---------------     ---------------


 Balance, December 31, 1995                  3,409,370           4.9200                404,351           2.8854

          Granted                            1,181,333           4.7600                   -                -

          Exercised                           (158,751)          4.2000                   (522)          2.4600

          Canceled                            (883,967)          5.0000                 (3,829)          2.3800
                                        ---------------    ---------------      ---------------     ---------------


 Balance, December 31, 1996                  3,547,985           4.8600                400,000           2.8906
          Granted                            1,108,400           3.9243                240,000           3.6600

          Exercised                            (39,500)          1.8072                 -                  -

          Canceled                            (679,400)          5.2930                (50,000)          5.6250
                                        ---------------    ---------------      ---------------     ---------------

 Balance, December 31, 1997                  3,937,485          $4.5559                590,000          $2.9718
                                        ---------------    ---------------      ---------------     ---------------



 Options exercisable at
     December 31, 1997(1)                    2,142,249          $4.8300
                                        ---------------    ---------------


 Options not exercisable at
     December 31, 1997(2)                    1,795,236          $4.2288
                                        ---------------    ---------------
</TABLE>

_________________
<TABLE>
<S>                                                        <C>
(1) Range of price for exercisable options:                $1.0625 - $7.75
(2) Range of price for non-exercisable options:            $3.3125 - $6.875
</TABLE>





                                      F-21
<PAGE>   63
         Summary of reserved shares

         As of December 31, 1997, the Company has reserved the following shares
of Common Stock for future use as follows:

<TABLE>
                   <S>                                                                 <C>
                   Unit purchase options . . . . . . . . . . . . . . . . . . .           118,346
                   1992 stock option plan  . . . . . . . . . . . . . . . . . .         3,937,485
                   Special stock options . . . . . . . . . . . . . . . . . . .           590,000
                   Conversion of debentures issued to
                      debenture holders  . . . . . . . . . . . . . . . . . . .         3,140,688
                   Warrants issued in conjunction with
                      private placements . . . . . . . . . . . . . . . . . . .           530,836
                                                                                    ------------
                                                                                       8,317,355
                                                                                    ------------
</TABLE>

         In February 1998, the Company filed an S-3 to register 5,587,965
shares of common Stock for the private placement of convertible preferred
stock.


(8)      COMMITMENTS AND CONTINGENCIES

         The Company has royalty arrangements with certain consultants and
institutions that call for royalty payments based upon a percentage of  sales
developed under the royalty agreements.  Royalty expense for the years ended
December 31,  1995, 1996 and 1997 was approximately $0.2, $0.3 and $0.4,
respectively.  In addition, the Company has entered into certain research
support agreements (see Note 6).  Annual minimum royalty and research support
payments, as of December 31, 1997, are as follows:

<TABLE>
<CAPTION>
               For the Year
                  Ending
               December 31,                                                  AMOUNT
               ------------                                                  ------
               <S>                                                        <C>
               1998  . . . . . . . . . . . . . . . . . . . .                $823,100
               1999  . . . . . . . . . . . . . . . . . . . .                 184,600
               2000  . . . . . . . . . . . . . . . . . . . .                 123,100
               2001  . . . . . . . . . . . . . . . . . . . .                 123,100
               2002  . . . . . . . . . . . . . . . . . . . .                 123,100
               Thereafter  . . . . . . . . . . . . . . . . .                 122,100
                                                                          ----------
                                                                          $1,499,000
                                                                          ----------
</TABLE>

         The Company leases office space and laboratory facilities under
operating lease agreements which expire in periods from 1997 to 2004.  Lessor
concessions with respect to space buildout and rental abatement, result in a
deferred rent credit at December 31, 1997 of $0.3 million.  Rental expense for
the years ended December 31, 1995, 1996 and 1997 was





                                      F-22
<PAGE>   64
approximately $0.7 million, $0.8 million and $0.9 million, respectively.
Minimum lease payments under these lease agreements, excluding operating
expense pass-throughs, as of December 31, 1997, are as follows:

<TABLE>
<CAPTION>
      FOR THE YEAR
        ENDING
      DECEMBER 31,                                                        AMOUNT
      ------------                                                        ------
        <S>                                                            <C>
        1998  . . . . . . . . . . . . . . . . . . . . . . .            $1,051,994
        1999  . . . . . . . . . . . . . . . . . . . . . . .             1,079,738
        2000  . . . . . . . . . . . . . . . . . . . . . . .             1,112,129
        2001  . . . . . . . . . . . . . . . . . . . . . . .             1,145,494
        2002  . . . . . . . . . . . . . . . . . . . . . . .             1,179,858
        Thereafter  . . . . . . . . . . . . . . . . . . . .             1,523,020
                                                                       -----------
                                             TOTAL                     $7,092,233
                                                                       -----------
</TABLE>


            In February 1995, the Company entered into a lease which was
accounted for as a capital lease with a net present value of future obligations
of approximately $1.2 million.

            The Company had guaranteed a loan of an officer/director for up to
approximately $1.0 million.  The loan is due upon demand and collateralized by
the Company's stock owned by the officer.  The guarantee is collateralized by
cash deposits of the Company.  In February 1998, the officer/director repaid
the loan in part and the Company obtained a release of approximately $0.8
million of funds which were issued to collateralize the Company's guarantee of
the loan.

            The Company has entered into agreements with certain senior
executives of the Company which provide for severance payments, totalling
approximately $900,000 in the event of a change in control or involuntary
termination.  In addition, certain senior executives will receive payments of
at least $250,000 in the aggregate, depending on the aggregate amount of
consideration underlying a sale of the Company.

            The Company has made advances to or paid expenses on behalf of the
same officer/director in an amount outstanding at December 31, 1997 of
approximately $300,000.  The officer executed term notes on September 19, 1997,
due September 30, 2000, in this amount.  The notes bear interest at 6% per
annum, payable in monthly installments of principal and interest of five
thousand dollars ($5,000), commencing October 1, 1997, each successive payment
to be made on the first day of each succeeding month, thereafter, until
September 30, 2000, when all remaining unpaid principal and interest shall be
paid in full.  In March 1998, the Company, in consideration of the officer's
continued employment pursuant to the terms of a Management Continuity
Agreement, dated September 29, 1997, between Oncor, Inc. and such officer,
reduced the outstanding installments by $75,000.

            The University of California and its licensee, Vysis, Inc.
("Vysis"), filed suit against Oncor on September 5, 1995 for infringement of
U.S. Patent No. 5,447,841 entitled Methods and Compositions for Chromosome
Specific Staining which issued on that same date.  The patent relates to a
method of performing in situ hybridization using a blocking nucleic acid that
is complementary to repetitive sequences.  On April 9, 1998, the Company, Vysis
and the University of California entered into a definitive agreement to settle
the litigation.  As part of the agreement, the Company, Vysis and the Regents
of the University





                                      F-23
<PAGE>   65
of California stipulated to a final judgment order which was approved and
issued by the U.S. District Court for the Northern District of California.
Under the terms of the definitive agreement, the Company obtained a world-wide
nonexclusive royalty-bearing license to any divisionals, continuations,
continuations-in-part, reissues, extensions, reexaminations, substitutions,
renewals and foreign counterparts thereof throughout the world for use in the
fields of human oncology for both clinical and research applications.  The
Company also obtained a nonexclusive royalty-bearing license to certain direct
labeling technology rights owned by Vysis and any divisionals, continuations,
continuations-in-art, reissues, extensions, reexaminations, substitutions,
renewals and foreign counterparts thereof throughout the world.  In return, the
Company has agreed to convey to Vysis its fluorescence in situ hybridization
(FISH) genetic probe business, retaining full rights to the field of human
oncology for research and clinical applications, including the Company's
recently FDA approved INFORM HER-2/neu breast cancer test.  The Company also
made initial cash payments to Vysis of $0.5 million, and an additional payment
of $1.5 million will be due on April 10, 2000 in order to extend the licenses
beyond that date.  In connection with the release by certain shareholders of
their security interest in the assets of the genetic probe business which was
conveyed to Vysis and the security interests in the assets of the research
business which is currently held for sale, the Company has committed to issue
warrants to purchase 2,000,000 shares of Oncor, Inc. common stock at $0.50 per
share.  In addition, the Company has committed to reprice approximately 480,000
existing warrants held by the same shareholders.

            On April 27, 1998, the Company received a summons and complaint in
connection with a lawsuit entitled Key Technology, Inc. v. Oncor, Inc. in the
Superior Court of the State of Washington for the County of Walla Walla.  The
complaint alleges breach of contract and fraud in connection with a June 1996
asset purchase agreement between Key Technology and the Company relating to the
sale of the Company's 1300 video inspection system to Key Technology, and seeks
damages against the Company of $1,475,000.  A failure to successfully defend
against or settle that suit would likely result in damages being assessed
against the Company and could have a material adverse effect on the Company's
business, financial condition or results of operations.

            A former employee brought suit against the Company in France for
approximately $0.3 million and instituted arbitration proceedings for $0.6
million, all related to the employee's termination.  The plaintiff has obtained
a ruling that the Company must retain in escrow an amount of funds equal to the
aggregate amount of the claims.  Such amounts are shown on the balance sheet as
restricted cash.  Management believes that the outcome of these matters will
not be material to the results of operations or financial condition of the
Company.


(9)         SEGMENT INFORMATION

            The Company operates in one dominant business segment, biomedical
research products, with research, development, manufacturing and marketing in
the United States and Europe.  The operations in Europe were acquired through
the acquisition of Appligene in September 1994.





                                      F-24
<PAGE>   66
            Product sales relating to each geographic region are as follows:


<TABLE>
<CAPTION>
                                                                     YEARS ENDED DECEMBER 31,
                                                                    -------------------------

                                                              1995               1996               1997
                                                              ----               ----               ----
       
   <S>                                                     <C>                <C>                  <C>
   United States   . . . . . . . . . . . . . . . .         $ 7,167,415        $ 6,644,041          $ 5,068,192
   Europe  . . . . . . . . . . . . . . . . . . . .           7,707,198          7,018,994            6,298,610
   Japan   . . . . . . . . . . . . . . . . . . . .             580,514            964,762              801,410
   Other   . . . . . . . . . . . . . . . . . . . .             737,709            695,370              780,771
                                                           -----------        -----------          -----------
                                                           $16,192,836        $15,323,167          $12,948,983
                                                           ===========        ===========          ===========


</TABLE>


         Revenues, largely in Europe, attributable to the Company's operations
in France for the years ended December 31, 1995, 1996 and 1997 were
approximately $7.3 million, $7.1 million and $6.6 million, respectively, and
net loss for the same periods were $0.9 million, $2.8 million and $4.0 million,
respectively.  The Company's identifiable assets in France at December 31,
1995, 1996 and 1997  were carried at approximately $9.2 million, $9.8 million
and $5.1 million, respectively, largely comprising goodwill.

         In 1996, the pharmaceutical imaging business unit was sold for
aggregate proceeds of $0.4 million and a net gain of $0.3 million which is
included in other income in the accompanying income statement.

         The operating losses attributable to the Company's operations in
France for the years ended December 31, 1995, 1996, and 1997 were approximately
$0.7 million, $2.8 million, and $3.6 million, respectively.  Export sales were
approximately $9.0 million, $8,7 million and $7.9 million for 1995, 1996 and
1997, respectively.

         Revenues of significant European Countries:
<TABLE>
<CAPTION>
                                                 1995                      1996                       1997
                                            --------------            --------------             --------------
                 <S>                        <C>                       <C>                        <C>
                 France                       3,681,633                2,845,889                   2,584,043
                 Germany                      1,718,367                1,610,696                   1,183,019
                 United Kingdom                 891,837                  854,381                   1,016,389

</TABLE>

(10)     RETIREMENT PLAN

         In 1991, the Company adopted a defined contribution savings plan (the
"Plan") in accordance with Section 401(k) of the Internal Revenue Code.  The
Plan covers all permanent employees who have attained the age of 21.  Under the
Plan, the Company may





                                      F-25
<PAGE>   67
make discretionary contributions.  The Company has made no discretionary
contributions to date and has no plans to do so.


(11)     LINE OF CREDIT

         During 1997, the Company obtained a $3.0 million line of credit which
expires on October 31, 1998.  Outstanding borrowings at December 31, 1997, were
$3.0 million.  The line is guaranteed by certain shareholders whose guarantees
are secured by substantially all of the assets of the Company.  The line bears
interest at a rate equal to the prime rate, as reported in the Wall Street
Journal, plus 2.0%, which is payable quarterly through July 31, 1998.  The
interest rate effective for the line of credit as of December 31, 1997 was
7.58%.  The Company issued options to purchase 900,000 shares of Oncormed, Inc.
("Oncormed," a 25% owned affiliate), held by the Company in conjunction with
establishing and extending this line of credit.  The Company has valued the
options at approximately $3.8 million which is reflected as a liability on the
balance sheet.  Approximately $1.8 million of the value of the options was
recorded as a charge to interest and other non-operating expense in 1997.  The
remaining deferred financing fees are included in other current assets and will
be charged to interest expense in future periods over the term of the line of
credit.





                                      F-26
<PAGE>   68
(12)     LONG-TERM DEBT

         Long-term debt at December 31 consists of the following obligations:

<TABLE>
<CAPTION>
                                                                           1996                   1997
                                                                           ----                   ----
 <S>                                                                   <C>                     <C>
 Convertible notes issued by the Company in connection with
 private placements, bearing interest at a rate of 6% per
 year, payable semi-annually, due in 2001.                              $8,851,589              $4,658,959

 Obligation under capital lease bearing interest at 5.62%
 (collateralized by building) with final maturity in 2010.               1,075,070                 865,953

 Various other notes payable to a French government funding
 agency and to banks, primarily secured by the assets of a
 subsidiary.  The interest rates range from 8.39% to 9.32%.              1,178,788                  893,40


                                                                    ---------------          ----------------
                                   Total long-term debt                 11,105,447               6,418,321

                                   Less current maturities                 719,337                 551,242
                                                                       -----------            ------------

                                   Non-current portion                 $10,386,110             $ 5,867,079
                                                                       ===========             ===========

</TABLE>
         The conversion price of the convertible notes payable at December 31,
1997 is 80.0% of the average market price for the Common Stock for the five
consecutive trading days ending one trading day prior to the date of the
conversion notice and the conversion price is the lower of the aforementioned
or $5.00 per share; the conversion of the notes are also subject to certain
additional restrictions.

         The aggregate maturities of long-term debt at December 31, 1997, are
as follows:

<TABLE>
                          <S>                         <C>
                          1998  . . . . . . . . . . . . .   $551,242
                          1999  . . . . . . . . . . . . .    380,137
                          2000  . . . . . . . . . . . . .    202,050
                          2001  . . . . . . . . . . . . .  4,843,703
                          2002  . . . . . . . . . . . . .    194,606
                          Thereafter  . . . . . . . . . .    246,583

                                                      --------------
                                            TOTAL         $6,418,321
                                                          ==========
</TABLE>




                                      F-27
<PAGE>   69
(13)     SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION

         Inventories

         Inventories consist of genetic probes, hybridization systems and
reagents in various manufactured states.  They are stated at lower of cost
(first-in, first-out) or market.

         Inventories consist of the following:
<TABLE>
<CAPTION>
                                                                             As of December 31,
                                                                ------------------------------------------
                                                                         1996                  1997
                                                                ----------------------- ------------------
         <S>                                                            <C>                <C>
         Raw materials   . . . . . . . . . . . . . . . . . .            $1,195,485           $980,379
         Work in progress  . . . . . . . . . . . . . . . . .             1,043,611            994,600
         Finished goods  . . . . . . . . . . . . . . . . . .             1,200,534          1,186,162
                                                                ----------------------- ------------------
                                                                        $3,839,630         $3,161,141
                                                                ----------------------- ------------------
</TABLE>


         Property and Equipment

         Property and equipment are stated at cost.  Depreciation and
amortization are calculated on a straight-line basis over the estimated useful
lives of the assets.  The building is depreciated over fifteen years.
Laboratory equipment is depreciated over seven years.  Office equipment,
furniture and fixtures are depreciated over seven and three years,
respectively.  Leasehold improvements are amortized over the lesser of their
estimated useful lives or the applicable lease term.

         Property and equipment consist of the following:


<TABLE>
<CAPTION>
                                                                             As of December 31,
                                                                ------------------------------------------
                                                                         1996                  1997
                                                                ----------------------- ------------------
         <S>                                                            <C>                <C>
         Building  . . . . . . . . . . . . . . . . . . . . .            $1,155,338         $1,010,680
         Laboratory equipment  . . . . . . . . . . . . . . .             3,713,500          3,892,403
         Office equipment, furniture and fixtures  . . . . .             5,011,235          4,985,281
         Leasehold improvements  . . . . . . . . . . . . . .             1,015,180          1,092,558
                                                                ----------------------- ------------------
                                                                        10,895,253         10,980,922
         Less - Accumulated depreciation and amortization  .            (5,850,983)        (6,805,154)
                                                                ----------------------- ------------------
         Net property and equipment  . . . . . . . . . . . .            $5,044,270         $4,175,768
                                                                ======================= ==================
</TABLE>



                                      F-28
<PAGE>   70
         Accrued Expenses and Other Current Liabilities

         Accrued expenses and other current liabilities consist of the
following:



<TABLE>
<CAPTION>
                                                                                   AS OF DECEMBER 31,
                                                                          --------------------------------------
                                                                                  1996               1997
                                                                                  ----               ----
         <S>                                                                    <C>                 <C>
         Employee benefit  . . . . . . . . . . . . . . . . . . . . . .           $ 512,063           $ 592,288
         Accrued royalties   . . . . . . . . . . . . . . . . . . . . .             125,025             166,496
         Unbilled professional fees  . . . . . . . . . . . . . . . . .             280,000             381,250
         Deferred revenue  . . . . . . . . . . . . . . . . . . . . . .              73,933              18,000
         Accrued taxes   . . . . . . . . . . . . . . . . . . . . . . .                -                156,093
         Liability to the market maker in
           subsidiary stock  . . . . . . . . . . . . . . . . . . . . .             500,000                -
         Severance   . . . . . . . . . . . . . . . . . . . . . . . . .                -                179,698
         Other   . . . . . . . . . . . . . . . . . . . . . . . . . . .             165,879             203,919
                                                                          ----------------   -----------------
                                                                                $1,656,900          $1,697,744
                                                                          ================   =================
</TABLE>

         Other Current Assets

         Other current assets as of December 31, 1997 consist primarily of
deferred financing fees of $2.0 million.  The costs related to the issuance of
debt are capitalized and amortized to interest expense using the effective
interest method over the lives of the related debt.

         Supplemental Schedule of Non-Cash Investing and Financing Activities

         Transactions relating to the issuance of shares of its Common Stock by
the Company in connection with conversion of convertible debt during 1997 and
1996 are as follows:


<TABLE>
<CAPTION>
                               YEAR                    SHARES ISSUED                        VALUE
                               <S>                       <C>                             <C>
                               1997                      2,888,088                       $10,317,520

                               1996                      2,163,242                        12,823,817
</TABLE>

         In 1997, the Company issued options to purchase 900,000 shares of its
25% owned affiliate Oncormed in consideration for establishing and extending a
line of credit.

         In February 1995, the Company entered into a $1.2 million capital
lease of a building.
                                




                                      F-29
<PAGE>   71
                                    PART III


         For information concerning Item 10, Directors and Executive Officers
of the Registrant, Item 11, Executive Compensation, Item 12, Security Ownership
of Certain Beneficial Owners and Management and Item 13, Certain Relationships
and Related Transactions, see the definitive proxy statement of Oncor, Inc.,
relative to the Annual Meeting of Shareholders to be held in June 1998, to be
filed with the Securities and Exchange Commission, which information is
incorporated herein by reference.





                                       40

<PAGE>   72
                                    PART IV


ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM
          8-K


<TABLE>
<CAPTION>
         (a)     Documents Filed as a Part of this Form 10-K:
         <S>     <C>
                 1.       Financial Statements.  The following consolidated financial statements of Oncor, Inc. and report of
                          independent public accountants relating thereto are filed with this Report.

                          Report of Independent Public Accountants on Financial Statements

                          Balance Sheets

                          Statements of Operations

                          Statements of Stockholders' Equity

                          Statements of Cash Flows

                          Notes to Financial Statements

                 2.       Financial Statement Schedules.  The following consolidated financial statement schedules of Oncor, Inc.
                          are filed with this Report.

                          Report of Independent Public Accountants on Schedule

                          Schedule II - Valuation and Qualifying Accounts
                          Information

                          (No other financial schedules are required.)
</TABLE>





                                       41
<PAGE>   73
<TABLE>
                          <S>     <C>
                          3.      EXHIBITS.
                                  --------

                          3       ARTICLES OF INCORPORATION AND BY-LAWS

                          3.1     Articles of Amendment filed with Department of Assessments and Taxation of the State of Maryland
                                  on August 6, 1992 to Fourth Amended and Restated Articles of Incorporation of Oncor, Inc.  (Filed
                                  as Exhibit 3.1 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December
                                  31, 1994 and incorporated herein by reference.)

                          3.2     By-Laws of Oncor, Inc., as amended and restated on November 6, 1990.  (Filed as Exhibit 3.2 to the
                                  Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 1990 and
                                  incorporated herein by reference.)

                          4       INSTRUMENTS DEFINING THE RIGHTS OF SECURITY-HOLDERS, INCLUDING INDENTURES.

                          4.1     Specimen certificate for shares of the Registrant's Common Stock.  (Filed as Exhibit 4.1 to the
                                  Registrant's Registration Statement No. 33-44520 and incorporated herein by reference.)

                          4.22    Provisions of the Articles of Incorporation and By-Laws defining rights of holders of Common Stock
                                  of the Registrant.  (Filed as Exhibit 3.1 to the Registrant's Annual Report on Form 10-K for the
                                  fiscal year ended December 31, 1993 and as Exhibit 3.2 to the Registrant's Annual Report on Form
                                  10-K for the fiscal year ended December 31, 1990, respectively, and incorporated herein by
                                  reference.)

                          10      MATERIAL CONTRACTS.

                          10.1    HPV Diagnostics Agreement of September 1988 with Medscand AB.  (Filed as Exhibit 19.1 to the
                                  Registrant's Quarterly Report on Form 10-Q for the quarter ended September 30, 1988 and
                                  incorporated herein by reference.)

                          10.2    Unit Purchase Option dated May 25, 1989 between Oncor, Inc. and D.H. Blair & Co., Inc., along with
                                  a schedule of nearly identical unit purchase options issued to other parties.  (Filed as Exhibit
                                  10.33 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 1989
                                  and incorporated herein by reference.)
</TABLE>





                                       42
<PAGE>   74
<TABLE>
                        <S>       <C>
                          10.3    Stock Option Agreement dated October 18, 1989 between Oncor, Inc. and Taylor & Turner, L.P.
                                  (Filed as Exhibit 10.41 to the Registrant's Annual Report on Form 10-K for the fiscal year ended
                                  December 31, 1989 and incorporated herein by reference.)

                          10.4    Stock Option Agreement dated October 18, 1989 between Oncor, Inc. and Rotan Mosle Technology
                                  Partners Ltd.  (Filed as Exhibit 10.41 to the Registrant's Annual Report on Form 10-K for the
                                  fiscal year ended December 31, 1989 and incorporated herein by reference.)

                          10.5    Stock Option Agreement dated October 18, 1989 between Oncor, Inc. and Charles Atwood Company.
                                  (Filed as Exhibit 10.42 to the Registrant's Annual Report on Form 10-K for the fiscal year ended
                                  December 31, 1989 and incorporated herein by reference.)

                          10.6    Stock Option Agreement dated October 18, 1989 between Oncor, Inc. and Stanton-Barnes Company.
                                  (Filed as Exhibit 10.43 to the Registrant's Annual Report on Form 10-K for the fiscal year ended
                                  December 31, 1989 and incorporated herein by reference.)

                          10.7    Stock Option Agreement dated February 8, 1990 between Oncor, Inc. and John Pappajohn.  (Filed as
                                  Exhibit 19.4 to the Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended March
                                  31, 1990 and incorporated herein by reference.)

                          10.8    Lease dated March 22, 1990 between Oncor, Inc. and Avenel Executive Park Phase II, Inc.  (Filed as
                                  Exhibit 19.6 to the Registrant's Quarterly Report on Form 10-Q for the fiscal quarter ended March
                                  31, 1990 and incorporated herein by reference.)

                          10.10   Stock Option Agreement dated November 20, 1990 between Oncor, Inc. and John Pappajohn.  (Filed as
                                  Exhibit 10.52 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December
                                  31, 1990 and incorporated herein by reference.)
</TABLE>





                                       43

<PAGE>   75
<TABLE>
                        <S>       <C>
                        10.13     Lease dated June 28, 1991 between Oncor, Inc. and Avenel Associates Limited Partnership.  (Filed
                                  as Exhibit 10.14 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December
                                  31, 1992 and incorporated herein by reference.)

                        10.14     Distribution Agreement dated November 28, 1991 between Oncor, Inc. and Medical Systems.  (Filed as
                                  Exhibit 10.15 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December
                                  31, 1992 and incorporated herein by reference.)

                        10.15     Lease dated March 22, 1990 between Oncor, Inc. and Avenel Executive Park Phase II, Inc., as
                                  amended on February 25, 1991 and June 21, 1991.  (Filed as Exhibit 10.15 to the Registrant's
                                  Annual Report on Form 10-K for the fiscal year ended December 31, 1994 and incorporated herein by
                                  reference.)

                        10.16     First Amendment to the Lease dated June 28, 1991 between Oncor, Inc. and Avenel Executive Park
                                  Phase II, Inc.  (Filed as Exhibit 10.16 to the Registrant's Annual Report on Form 10-K for the
                                  fiscal year ended December 31, 1994 and incorporated herein by reference.)

                        10.17     Management Continuity Agreement, dated September 29, 1997, between Oncor, Inc. and Stephen Turner.

                        10.18     Management Continuity Agreement, dated September 29, 1997, between Oncor, Inc. and Cecil Kost.

                        10.19     Management Continuity Agreement, dated September 29, 1997, between Oncor, Inc. and John L. Coker.

                        23        Consent of Independent Public Accountants to incorporation of reports in Company's Annual Report
                                  on Form 10-K for the fiscal year ended December 31, 1997 into the Company's previously filed S-3
                                  Registration Statements File Nos. 333-00085, 333-00735, 333-11997, 333-20425 and 333-46855, and
                                  into S-8 Registration Statements File Nos. 33-83830, 33-81021 and 333-00063.

                        27.1      Financial Data Schedule.
</TABLE>





                                       44
<PAGE>   76
<TABLE>
         <S>     <C>
         (b)     Reports on Form 8-K.

                 None.
</TABLE>





                                       45
<PAGE>   77
                                   SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the Registrant has duly caused this Report to be signed on its
behalf by the undersigned, thereunto duly authorized.

                                        ONCOR, INC.


<TABLE>
<S>      <C>                      <C>      
Date:    May 21, 1998             By       /s/ Cecil Kost
                                    ---------------------------------
                                           Cecil Kost
                                           President and Chief Operating Officer
</TABLE>

Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>
Date                                                        Title
- ----                                                        -----

<S>                       <C>                               <C>
May 21, 1998              /s/ Jose J. Coronas               Chairman of the Board
                          --------------------------
                          Jose J. Coronas


May 21, 1998              /s/ Cecil Kost                    President, Chief Operating Officer and
                          --------------------------
                          Cecil Kost                        Director (principal executive officer)


May 21, 1998              /s/ John L. Coker                 Vice President, Secretary and
                          --------------------------
                          John L. Coker                     Treasurer (principal financial officer
                                                            and principal accounting officer)

May 21, 1998              /s/ Derace L. Schaffer            Director
                          --------------------------
                          Derace L. Schaffer


May 21, 1998              /s/ William H. Taylor II          Director
                          --------------------------
                          William H. Taylor II


May 21, 1998              /s/ Timothy J. Triche             Director
                          --------------------------
                          Timothy J. Triche


May 21, 1998              /s/ Stephen Turner                Director
                          --------------------------
                          Stephen Turner
</TABLE>





<PAGE>   78

             REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS ON SCHEDULES



To Oncor, Inc.:

We have audited, in accordance with generally accepted auditing standards, the
consolidated financial statements of Oncor, Inc., and subsidiaries included in
this Form 10-K and have issued our report thereon dated February 20, 1998
(except with respect to the financial condition of the Company described in
Note 1, and to the Vysis and Key Technology matters described in Note 8, as to
which the date is April 30, 1998).  Our audits were made for the purpose of
forming an opinion on the basic financial statements taken as a whole.  The
Schedule II Valuation and Qualifying Accounts is the responsibility of the
Company's management and is presented for purposes of complying with the
Securities and Exchange Commission's rules and is not part of the basic
financial statements.  This schedule has been subjected to the auditing
procedures applied in the audits of the basic financial statements and, in our
opinion, fairly states, in all material respects the financial data required to
be set forth therein, in relation to the basic financial statements taken as a
whole.





                                                             ARTHUR ANDERSEN LLP


Washington, D.C.,
February 20, 1998





                                      S-1
<PAGE>   79
                                  ONCOR, INC.

                SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

<TABLE>
<CAPTION>
                                                        Additions
                                   Balance at          charged to
                                  beginning of          expenses                         Balance at end
                                     period           (recoveries)        Write-offs       of  period
                                ----------------     --------------      ------------    --------------
<S>                                 <C>                 <C>              <C>                 <C>
December 31, 1995
- -----------------------
Allowance for                          173,351            200,295          (32, 764)            340,882
  doubtful accounts

December 31, 1996
- -----------------------
Allowance for                          340,882             73,408           (42,306)            371,984
  doubtful accounts

December 31, 1997
- -----------------------
Allowance for                          371,984             46,647                --             418,631
  doubtful accounts

December 31, 1995
- -----------------------
Reserve for excess and                 807,601          2,180,331        (1,457,722)          1,530,210
  obsolete inventory

December 31, 1996
- -----------------------
Reserve for excess and               1,530,210          1,450,192          (327,281)          2,653,121
  obsolete inventory

December 31, 1997
- -----------------------
Reserve for excess and               2,653,121            738,256          (495,443)          2,895,934
  obsolete inventory

December 31, 1995
- -----------------------
Deferred tax valuation              20,800,000          7,500,000                --          28,300,000
reserve

December 31, 1996
- -----------------------
Deferred tax valuation              28,300,000          7,500,000                --          35,800,000
reserve

December 31, 1997
- -----------------------
Deferred tax valuation              35,800,000          8,100,000                --          43,900,000
reserve
</TABLE>





                                      S-2

<PAGE>   1


                                                                   EXHIBIT 10.17

                                  ONCOR, INC.
                 EMPLOYMENT AND MANAGEMENT CONTINUITY AGREEMENT


                 This Employment and Management Continuity Agreement (the
"Agreement") is made and entered into effective as of September 29, 1997, by
and between Steven Turner (the "Executive") and Oncor, Inc., a Maryland
corporation (the "Company" or "Oncor").

                                    RECITALS

                 A.       The Board of Directors of the Company (the "Board")
                          believes that it is in the best interests of the
                          Company and its stockholders to provide the Executive
                          with the incentive to continue his employment with
                          the Company and to motivate the Executive to maximize
                          the value of the Company.

                 B.       The Company has retained Lehman Brothers pursuant to
                          a letter dated June 3, 1997 (the "Lehman Letter"),
                          which contemplates the possibility of an acquisition
                          of the Company by another company or other change of
                          control.  The Board recognizes that such
                          consideration can be a distraction to the Executive
                          and can cause the Executive to consider alternative
                          employment opportunities.  The Board has determined
                          that it is in the best interests of the Company and
                          its stockholders to assure that the Company will have
                          the continued dedication and objectivity of the
                          Executive, notwithstanding the possibility, threat or
                          occurrence of a Change of Control (as defined below)
                          of the Company.  The Board has further determined
                          that it is in the best interests of the Company to
                          provide incentives to the Executive to maximize the
                          value of the Company in anticipation of any Change of
                          Control.

                 C.       The Board believes that it is imperative to provide
                          the Executive with certain benefits upon termination
                          of employment or upon a Change of Control, which
                          benefits are intended to provide the Executive with
                          financial security and provide sufficient incentive
                          and encouragement to the Executive to remain with the
                          Company notwithstanding the possibility of a Change
                          of Control.

                 D.       To accomplish the foregoing objectives, the Board has
                          directed the Company, upon execution of this
                          Agreement by the Executive, to agree to the terms
                          provided herein.

                 NOW, THEREFORE, in consideration of the mutual covenants
                 herein contained, and in consideration of the continuing
                 employment of the Executive by the Company, the parties agree
                 as follows:
<PAGE>   2
                 1.       DEFINITION OF TERMS.  The following terms referred to
                          in this Agreement shall have the following meanings:

                          (a)     Affiliate.  "Affiliate" means any
                                  corporation, firm or partnership directly or
                                  indirectly controlled by, controlling or
                                  under common control with the Company.

                          (b)     Base Compensation. "Base Compensation" shall
                                  mean base salary of the Executive, as
                                  adjusted from time to time by the Board, in
                                  its discretion.

                          (c)     Cause.  "Cause" shall mean (i) any act of
                                  personal dishonesty taken by the Executive in
                                  connection with his responsibilities as an
                                  employee that is intended to result in
                                  substantial personal enrichment of the
                                  Executive or his associates at the expense of
                                  the Company or its stockholders, (ii)
                                  committing a felony or an act of fraud
                                  against the Company or its affiliates, (iii)
                                  continued violations by the Executive of the
                                  Executive's obligations under this Agreement
                                  which are willful and deliberate on the
                                  Executive's part after there has been
                                  delivered to the Executive a written demand
                                  from the Company to cease such activities; or
                                  (iv) Executive purposely makes negative and
                                  inaccurate comments about the Company in
                                  circumstances where such information is
                                  likely to become available to the public.

                          (d)     Change of Control.  "Change of Control" shall
                                  mean a "Sale" of the Company as defined in
                                  the Lehman Letter, to wit:  A "Sale" of the
                                  Company shall mean any transaction or series
                                  or combination of transactions, other than in
                                  the ordinary course of business, whereby,
                                  directly or indirectly, control of or a
                                  majority interest in the Company or a
                                  majority of its assets, is transferred for
                                  consideration, including, without limitation,
                                  by means of a sale or exchange of capital
                                  stock or assets, a merger or consolidation, a
                                  tender or exchange offer, a leveraged buy-out
                                  or any similar transaction.

                          (e)     Disability.  "Disability" shall mean that the
                                  Executive has been unable to perform his
                                  duties under this Agreement as the result of
                                  his incapacity due to physical or mental
                                  illness, and such inability, at least 180
                                  days after its commencement, is determined to
                                  be permanent by a physician selected by the
                                  Company or its insurers and is acceptable to
                                  the Executive or the Executive's legal
                                  representative (agreement regarding






<PAGE>   3
                                  acceptability not to be unreasonably
                                  withheld).  Termination resulting from
                                  Disability may only be effected after at
                                  least 30 days' written notice to the
                                  Executive by the Company of its intention to
                                  terminate the Executive's employment.  In the
                                  event that the Executive resumes the
                                  performance of substantially all of his
                                  duties hereunder before the termination of
                                  his employment becomes effective, and
                                  continues to perform such duties for a period
                                  of at least 60 days, the notice of intent to
                                  terminate shall automatically be deemed to
                                  have been revoked.

                          (f)     Involuntary Termination.  "Involuntary
                                  Termination" shall mean the Executive's
                                  voluntary resignation within 3 months of the
                                  occurrence of any of the following events:
                                  (i) without the Executive's consent, the
                                  reduction of the Executive's duties or the
                                  removal of the Executive from his position
                                  and responsibilities as set forth in this
                                  Agreement; (ii) without the Executive's
                                  consent, a reduction of the facilities and
                                  perquisites (including office space, support
                                  staff and location) available to the
                                  Executive; (iii) a reduction by the Company
                                  in the Base Compensation of the Executive as
                                  in effect immediately prior to such
                                  reduction; (iv) a material reduction by the
                                  Company in the kind or level of employee
                                  benefits to which the Executive is entitled
                                  with the result that the Executive's overall
                                  benefits package is significantly reduced; or
                                  (v) the refusal by the Executive to relocate
                                  his principal place of employment to a
                                  facility or location more than 75 miles from
                                  the Executive's then present location
                                  following a written demand from the Company
                                  to undertake such relocation.  An Involuntary
                                  Termination will also include (i) any
                                  purported termination of the Executive by the
                                  Company which is not effected by Disability
                                  or for Cause, as those terms are defined
                                  herein, or any purported termination for
                                  which the grounds relied upon are not valid
                                  under this Agreement, or (ii) the failure of
                                  the Company to obtain the assumption of this
                                  Agreement by any successors as contemplated
                                  in Section 8 below.

                 2.       EMPLOYMENT; TERM.  The Company hereby agrees to
                          continue to employ the Executive, and the Executive
                          hereby agrees to continue such employment, as Chief
                          Executive Officer of the Company, for the period
                          effective September 29, 1997 and ending on September
                          28, 1999 unless terminated sooner.  For purposes
                          hereof, the period of Executive's employment
                          hereunder is referred to as the "Term".






                                       3
<PAGE>   4
                 3.       DUTIES AND EXTENT OF SERVICES.

                          (a)     During the Term, the Executive shall serve as
                                  Chief Executive Officer of the Company with
                                  such duties and responsibilities as are
                                  consistent with such positions, and shall so
                                  serve faithfully and to the best of his
                                  ability, under the direction and supervision
                                  of the Company's Board of Directors (the
                                  "Board").

                          (b)     The Executive shall continue to serve as a
                                  Director of the Company if elected to such
                                  position in accordance with law and hold such
                                  other positions and executive offices of the
                                  Company and/or of any of the Company's
                                  subsidiaries or affiliates as may from time
                                  to time be authorized by the Board of
                                  Directors of the Company, provided that each
                                  such position shall be commensurate with the
                                  Executive's standing in the business
                                  community as Chief Executive Officer of the
                                  Company.  The Executive shall not be entitled
                                  to any compensation other than the
                                  compensation provided for herein for serving
                                  during the Term as a Director of the Company
                                  or in any other office or position of the
                                  Company, or any of its subsidiaries or
                                  affiliates, unless the Board of Directors of
                                  the Company shall have specifically approved
                                  such additional compensation.

                          (c)     The Executive shall devote substantially full
                                  business time, attention and efforts to his
                                  duties hereunder, except to the extent
                                  specified below.  The Executive shall
                                  diligently perform to the best of his ability
                                  all of the duties required of him as Chief
                                  Executive Officer of the Company, and in the
                                  other positions or offices of the Company or
                                  its subsidiaries or affiliates required of
                                  him hereunder.  The Executive shall
                                  faithfully adhere to, execute and fulfill all
                                  policies established by the Company.
                                  Notwithstanding the foregoing provisions of
                                  this section, the Executive may participate
                                  in charitable, civic, political, social,
                                  trade, or other non-profit organizations to
                                  the extent such participation does not
                                  materially interfere with the performance of
                                  his duties hereunder, and may make personal
                                  investments in, and may serve as a
                                  non-management director or non-employee
                                  officer of, business corporations (or in a
                                  like capacity in other for-profit
                                  organizations) so long as it does not
                                  materially interfere with the Executive's
                                  obligations hereunder.

                          (d)     Company and Executive agree that if they
                                  agree that Executive shall change primary
                                  responsibilities to become a substantially






                                       4
<PAGE>   5
                                  full time chief executive officer or a
                                  similar position with a subsidiary of the
                                  Company such as Codon Pharmaceuticals, Inc.
                                  ("New Company"), then New Company shall
                                  become the employer of Executive under this
                                  Agreement provided that (i) Company shall
                                  remain financially obligated for the
                                  obligations of New Company hereunder and (ii)
                                  if Executive's base salary for New Company is
                                  less than $240,000 annually, Company will
                                  make up the difference.

                 4.       BASE COMPENSATION.  The Company shall continue to pay
                          the Executive as compensation for his services a base
                          salary at the annualized rate of Two Hundred Forty
                          Thousand Dollars ($240,000), along with such
                          performance bonus amounts, if any, as the Board may
                          authorize, in its discretion, from time to time.
                          This annual salary and bonus (if any) may be raised,
                          or reduced (but only with consent of the Executive)
                          from time to time by the Board.  Such salary shall be
                          paid periodically in accordance with normal Company
                          payroll practices.

                                  If (a) Executive is still employed on March
                          1, 1998, or (b) prior to that time his employment is
                          terminated (i) by the Company without Cause, (ii) as
                          a result of a Change or Control, (iii) due to
                          disability or (iv) by Involuntary Termination, then
                          the Company shall reduce the outstanding indebtedness
                          of Executive to the Company by $75,000.  The parties
                          agree to provide such documentation of that reduction
                          of debt as may be necessary or appropriate under the
                          circumstances.  Any of such amount is not necessary
                          to reduce indebtedness shall paid to Executive in
                          cash, subject to the appropriate withholding
                          requirements.

                 5.       EXECUTIVE BENEFITS.  The Executive shall be eligible
                          to participate in the employee benefit plans and
                          executive compensation programs maintained by the
                          Company and applicable to other key executives of the
                          Company, including, without limitation, retirement
                          plans, savings or profit-sharing plans, stock option
                          plans, incentive or other bonus plans, life,
                          disability, health, accident and other insurance
                          programs, paid vacations and similar programs or
                          plans, subject in each case to the generally
                          applicable terms and conditions of the applicable
                          plan or program in question, to the determination of
                          any committee administering such program or plan and
                          to the terms of this Agreement.

                 6.       SEVERANCE BENEFITS.

                          (a)     Termination Apart from Change of Control.  In
                                  the event the Executive's employment
                                  terminates in circumstances that






                                       5
<PAGE>   6
                                  constitute an Involuntary Termination prior
                                  to the occurrence of a Change of Control (the
                                  "No-Change Period"), then the Executive shall
                                  be entitled to receive severance pay equal to
                                  24 months' Base Compensation, to be paid out
                                  monthly at the same time as the Company's
                                  regular payroll is paid, and any other
                                  benefits that may then be established under
                                  the Company's existing severance and benefit
                                  plans and policies, if any, for employees
                                  generally at the time of such termination.
                                  In the event the Executive resigns under
                                  circumstances that do not constitute an
                                  Involuntary Termination during the No-Change
                                  Period, then no severance payment shall be
                                  due unless in accordance with the Company's
                                  existing severance and benefit plans and
                                  policies, if any, for employees generally at
                                  the time of such termination.

                          (b)     Termination In Connection With A Change In
                                  Control.  (i) Subject to the limitation on
                                  payments set forth in Section 8 below, if the
                                  Company terminates the Executive's employment
                                  in connection with a Change in Control under
                                  circumstances that constitute an Involuntary
                                  Termination, then the Executive shall be
                                  entitled to receive severance pay in an
                                  amount equal to 24 months' Base Compensation.
                                  Any severance payments to which the Executive
                                  is entitled pursuant to this paragraph shall
                                  be paid in a lump sum within thirty (30) days
                                  after the Executive's termination.  (ii)
                                  Following a Sale, the Executive agrees to
                                  remain an Oncor employee (or an employee of
                                  Oncor's successor after a Sale) until six (6)
                                  months after the  Sale Date or earlier
                                  termination by Oncor (other than in cases of
                                  death or disability).

                                        The Executive is party to Option
                                  Agreements with the Company, pursuant to
                                  which he can purchase shares of the Company's
                                  common stock.  The Company's Stock Option
                                  Plan, pursuant to which the Option Agreement
                                  was entered into, provides for termination of
                                  the option period ninety days after the
                                  Executive ceases to perform services for the
                                  Company.  In consideration of the mutual
                                  promises and covenants contained herein and
                                  if permissible under the Sale transaction and
                                  the policies of the purchaser, the Executive
                                  shall be able to exercise options under the
                                  Option Agreements following a Sale at any
                                  time up to the scheduled expiration of the
                                  option period under the Option Agreement
                                  notwithstanding termination of employment.






                                       6
<PAGE>   7
                          (c)     Termination for Cause.  Notwithstanding
                                  anything else contained in this Agreement, if
                                  the Company terminates the Executive's
                                  employment for Cause, then the Executive
                                  shall not be entitled to receive severance or
                                  other benefits pursuant to this Agreement
                                  except for those benefits, if any, as then
                                  established under the Company's then existing
                                  severance and benefit plans and policies at
                                  the time of such termination.

                          (d)     Medical, Life and Disability Benefits.  In
                                  the event the Executive is entitled to
                                  severance benefits pursuant to this
                                  Agreement, then in addition to such severance
                                  benefits, the Executive shall receive
                                  Company-paid health, life and disability
                                  insurance coverage to the extent provided to
                                  such Executive immediately prior to the
                                  Executive's termination (the "Company-Paid
                                  Coverage") for two (2) years after the date
                                  of termination of employment or until the
                                  Executive becomes covered under another
                                  employer's group health, life or disability
                                  insurance plan, whichever occurs first.  If
                                  the Executive's health, life and disability
                                  insurance coverage included the Executive's
                                  dependent(s) immediately prior to the
                                  Executive's termination, such dependent(s)
                                  shall also be covered at Company expense.
                                  For purposes of the continuation health
                                  coverage covered under the federal statute
                                  known as COBRA, the date of the "qualifying
                                  event" triggering the Executive's Election
                                  Period (and that of his qualifying
                                  beneficiaries) shall be the last date on
                                  which the Executive receives Company-Paid
                                  Coverage under this Agreement.

                          (e)     Death.  If the Executive's employment is
                                  terminated due to the death of the Executive,
                                  then the Executive shall not be entitled to
                                  receive severance or other benefits pursuant
                                  to this Agreement except for those benefits
                                  (if any) as then established under the
                                  Company's then existing severance and
                                  benefits plans and policies at the time of
                                  death.

                          (f)     In connection with the provisions in this
                                  Agreement, the Executive acknowledges and
                                  agrees that he has no other claims or
                                  agreements relating to remuneration or
                                  compensation from the Company, except
                                  pursuant to existing written Company
                                  compensation plans and policies.

                 7.       UNAUTHORIZED DISCLOSURE; PROHIBITED AND COMPETITIVE
                          ACTIVITIES.






                                       7
<PAGE>   8
                          (a)     The Executive understands and agrees that due
                                  to the Executive's position with the Company,
                                  both prior to and subsequent to the effective
                                  date of this Agreement, the Executive has
                                  been and will be exposed to, and has received
                                  and will receive, confidential and
                                  proprietary information of the company
                                  relating to the Company's business affairs
                                  (collectively, the "Trade Secrets"),
                                  including, but not limited to, technical
                                  information, product information and
                                  formulae, processes, business and marketing
                                  plans, strategies, customer information,
                                  other information concerning the Company's
                                  products, promotions, development, financing,
                                  expansion plans, business policies and
                                  practices, salaries and benefits, and other
                                  forms of information considered by the
                                  Company to be proprietary and confidential
                                  and in the nature of trade secrets.  Except
                                  to the extent that the proper performance of
                                  the Executive's duties, services and
                                  responsibilities hereunder may require
                                  disclosure, and except as such information
                                  (i) was known to the Executive prior to his
                                  employment by the Company, or (ii) was or
                                  becomes generally available to the public
                                  other than as a result of a disclosure by the
                                  Executive in violation of the provisions of
                                  this paragraph, the Executive agrees that
                                  during his employment with the Company and at
                                  all times thereafter the Executive will keep
                                  such Trade Secrets confidential and will not
                                  disclose such information, either directly or
                                  indirectly, to any third person or entity
                                  without the prior written consent of the
                                  Company or use such information for the
                                  benefit of himself or any third person or
                                  entity without the prior written consent of
                                  the Company.  This confidentiality
                                  restriction, has no temporal, geographical or
                                  territorial restrictions, provided, however,
                                  that if in the written opinion of counsel,
                                  the Executive is legally compelled to
                                  disclose Trade Secrets to any tribunal of
                                  only those Trade Secrets which such counsel
                                  advises in writing are legally required to be
                                  disclosed shall not constitute a Prohibited
                                  Activity provided that the Executive shall
                                  give the Company as much advance notice of
                                  such disclosure as is reasonably practicable.

                          (b)     On the effective date of any termination of
                                  the Executive's employment with the Company,
                                  the Executive will promptly supply to the
                                  Company all property, including, but not
                                  limited to, keys, notes, memoranda, writings,
                                  lists, files, reports, customer lists,
                                  correspondence, tapes, disks, cards, surveys,
                                  maps, logs, machines, technical data,
                                  formulae, or any other






                                       8
<PAGE>   9
                                  tangible product or document, and any and all
                                  copies, duplicates or reproductions thereof,
                                  which has been produced by, received by or
                                  otherwise submitted to the Executive in the
                                  course of his employment with the Company
                                  other than personal items.

                          (c)     The Executive and the Company recognize that
                                  due to the nature of the Executive's position
                                  with the Company and the relationship of the
                                  Executive and the Company, both prior to and
                                  subsequent to the date of this Agreement, the
                                  Executive has had and will have access to,
                                  has had and will acquire, and has assisted
                                  and may continue to assist in developing
                                  confidential and proprietary information
                                  relating to the business and operations of
                                  the Company and its affiliates, including
                                  Trade Secrets.  The Executive acknowledges
                                  that such information has been and will be of
                                  central importance to the business of the
                                  Company and its affiliates and that
                                  disclosure of it to, or its use by, others
                                  (including, without limitation, the
                                  Executive, other than in furtherance of the
                                  Company's business and affairs ), could cause
                                  substantial loss to the Company.  The
                                  Executive and the Company also recognize that
                                  an important part of the Executive's duties
                                  has been to develop goodwill for the Company
                                  and its affiliates through his personal
                                  contact with Customers (as defined below),
                                  employees, and others having business
                                  relationships with the Company, and that
                                  there is a danger that this goodwill, a
                                  proprietary asset of the Company, may follow
                                  the Executive if and when his relationship
                                  with the Company is terminated.  The
                                  Executive accordingly agrees that, during the
                                  balance of his employment with the Company,
                                  and for a period of one (1) year after the
                                  Sale Date, he will not:

                                  (i)         directly or indirectly, whether
                                              for his own account or for the
                                              account of any other person or
                                              entity, solicit, divert or
                                              endeavor to entice away Customers
                                              from the Company or any entity
                                              controlled by the Company, or
                                              otherwise engage in any activity
                                              intended to terminate, disrupt or
                                              interfere with the Company's or
                                              any of its affiliates'
                                              relationship with Customers, or
                                              otherwise adversely affect the
                                              Company's or any of its
                                              affiliates' relationship with
                                              Customers or other business
                                              relationships of the Company or
                                              any affiliate thereof;

                                  (ii)        publish or make any statement
                                              critical of the Company or any
                                              shareholder, officer, director or
                                              affiliate, or in






                                       9
<PAGE>   10
                                              any way adversely affect or
                                              otherwise malign the business or
                                              personal reputation of any of
                                              such parties; and the Company
                                              agrees not to publish or make any
                                              statement critical of Executive
                                              or in any way adversely affect or
                                              otherwise malign the business or
                                              personal reputation of Executive.

                                  (iii)       directly or indirectly solicit
                                              any person who, at the time of
                                              such solicitation, is employed by
                                              the Company or any affiliate
                                              thereof, for employment at any
                                              employer other than the Company,
                                              or recommend to any subsequent
                                              employer of the Executive the
                                              solicitation for employment of
                                              any such employee of the company
                                              or affiliate; or

                                   (iv)       engage in any "Competitive
                                              Activity," as defined below.

                          (d)     Customers.  "Customers" shall mean those
                                  persons or entities who, at any time during
                                  the Executive's employment with the Company,
                                  and/or during the period one (1) year after
                                  the termination of the Executive's
                                  employment, are or were customers or clients
                                  of the Company or any affiliate thereof or
                                  any predecessor of any of the foregoing.

                          (e)     Competitive Activity.  "Competitive Activity"
                                  means engaging in any of the following
                                  activities, singly or in any combination:

                                  (i)         serving as a director of a
                                              "Competitor" (as defined below);

                                  (ii)        directly or indirectly either
                                              controlling any Competitor, or
                                              owning any equity or debt
                                              interests in any Competitor
                                              (other than equity or debt
                                              interests which are publicly
                                              traded and, at the time of any
                                              acquisition, do not exceed five
                                              percent (5%) of the particular
                                              class of interests outstanding,
                                              it being understood that, if
                                              interests in any Competitor are
                                              owned by an investment vehicle or
                                              other entity in which the
                                              Executive owns an equity
                                              interest, a portion of the
                                              interests in such Competitor
                                              owned by such entity shall be
                                              attributed to the Executive, such
                                              portion shall be determined by
                                              applying the percentage






                                       10
<PAGE>   11
                                              of the equity interest in such
                                              entity owned by the Executive to
                                              the interests in such Competitor
                                              owned by such entity);

                                  (iii)       employment by, including serving
                                              as an officer or partner of,
                                              providing consulting services to
                                              (including, without limitation,
                                              as an independent contractor),
                                              or, managing or operating the
                                              business or affairs of any
                                              Competitor; or

                                  (iv)        participating in the ownership,
                                              management, operation or control
                                              of or being connected in any
                                              manner with any Competitor.

                          (f)     Competitor.  "Competitor" means any person
                                  (other than the Company or any of its
                                  affiliates) that competes, either directly or
                                  indirectly, with any of the business
                                  conducted by the Company or any of its
                                  affiliates in the United States, such
                                  business being, without limitation, those
                                  related to the development, production and
                                  marketing of cancer-oriented genetic probes,
                                  related reagents, molecular biology products
                                  and diagnostic products for the detection and
                                  management of certain cancers, it being
                                  agreed that the list of parties conclusively
                                  deemed to be the Competitors covered hereby
                                  are Boehringer-Mannheim, Hoffman LaRoche,
                                  Vysis, Inc. and their respective affiliates.

                          (g)     Remedies.  The Executive agrees that any
                                  breach of the terms of this Section 7 would
                                  result in irreparable injury and damage to
                                  the Company for which the Company would have
                                  no adequate remedy at law; the Executive
                                  therefore also agrees that in the event of
                                  said breach or any threatened breach, the
                                  Company shall be entitled to an immediate
                                  injunction and restraining order to prevent
                                  such breach and/or threatened breach and/or
                                  continued breach by the Executive and/or any
                                  and all persons and/or entities acting for
                                  and/or with the Executive, without having to
                                  prove damages, in addition to any other
                                  remedies to which the Company may be entitled
                                  at law or in equity.  The terms of this
                                  paragraph shall not prevent the Company from
                                  pursuing any other available remedies for any
                                  breach or threatened breach hereof,
                                  including, without limitation, the recovery
                                  of damages from the Executive.  The Company
                                  shall have the right to seek injunctive or
                                  other relief for the breach or






                                       11
<PAGE>   12
                                  threatened breach by the Executive of this
                                  Section 7 in any court of competent
                                  jurisdiction.  The provisions of this Section
                                  7 shall survive any termination of this
                                  Agreement.  The existence of any claim or
                                  cause of action by the Executive against the
                                  Company, whether predicated on this Agreement
                                  or otherwise, shall not constitute a defense
                                  to the enforcement by the Company of the
                                  covenants and agreements in this Section 7.

                 8.       LIMITATION ON PAYMENTS.  To the extent that any of
                          the payments and benefits provided for this Agreement
                          or otherwise payable to the Executive constitute
                          "parachute payments" within the meaning of Section
                          280G of the Internal Revenue Code, as amended, and,
                          but for this Section 8, would be subject to the
                          excise tax provided for by Section 4999 of that Code,
                          then the Executive's benefits under Section 6 above,
                          as applicable, shall be payable either

                          (a)     in full, or

                          (b)     as to such lesser amount as would result in
                                  no portion of such severance benefits being
                                  subject to the excise tax under Section 4999
                                  of the Code,

                          whichever of the foregoing amounts, taking into
                          account the applicable federal, state and local
                          income taxes and the excise tax imposed under Section
                          4999, results in the receipt by the Executive on an
                          after-tax basis of the greatest amount of severance
                          benefits under Section 6 above, notwithstanding that
                          all or some portion of such severance benefits may be
                          taxable under Section 4999.  Unless the Company and
                          the Executive otherwise agree in writing, any
                          determination required under this Section 8 shall be
                          made in writing by an independent public accounting
                          firm reasonably acceptable to the Company other than
                          that used by the Company (the "Accountants"), whose
                          determination shall be conclusive and binding upon
                          the Executive and the Company for all purposes.  For
                          purposes of making the calculations required by this
                          Section 8, the Accountants may make reasonable
                          assumptions and approximations concerning applicable
                          taxes and may rely on reasonable, good faith
                          interpretations concerning the application of
                          Sections 280G and 4999.  The Company and the
                          Executive shall furnish to the Accountants such
                          information and documents as the Accountants may
                          reasonably request in order to make a determination
                          under this Section.  The Company shall bear all costs
                          the Accountants may reasonably incur in connection
                          with any calculations provided for by this Section 8.






                                       12
<PAGE>   13
                 9.       SUCCESSORS.

                          (a)     Company's Successors.  Any successor to the
                                  Company (whether direct or indirect and
                                  whether by purchase of stock, purchase of
                                  assets, lease, merger, consolidation,
                                  liquidation or otherwise) to all or
                                  substantially all of the Company's business
                                  and assets shall assume the obligations under
                                  this Agreement and agree expressly to perform
                                  the obligations under this Agreement in the
                                  same manner and to the same extent as the
                                  Company would be required to perform such
                                  obligations in the absence of a succession.
                                  For all purposes under this Agreement, the
                                  term "Company" shall include any successor to
                                  the Company's business and assets which
                                  executes and delivers the assumption
                                  agreement described in this paragraph or
                                  which becomes bound by the terms of this
                                  Agreement by operation of law.

                          (b)     Executive's Successors.  Except as otherwise
                                  specifically provided in this Agreement, the
                                  terms of this Agreement and all rights of the
                                  Executive hereunder shall inure to the
                                  benefit of, and be enforceable by, the
                                  Executive's personal or legal
                                  representatives, executors, administrators,
                                  successors, heirs, devicees and legatees.

                 10.      NOTICE.

                          (a)     General.  Notices and all other
                                  communications contemplated by this Agreement
                                  shall be in writing and shall be deemed to
                                  have been duly given when personally
                                  delivered or three (3) days after being
                                  mailed by U.S. registered or certified mail,
                                  return receipt requested and postage prepaid.
                                  In the case of the Executive, mailed notices
                                  shall be addressed to him at the home address
                                  which he most recently communicated to the
                                  Company in writing.  In the case of the
                                  Company, mailed notices shall be addressed to
                                  its corporate headquarters, and all notices
                                  shall be directed to the attention of its
                                  Secretary.

                          (b)     Notice of Termination.  Any termination by
                                  the Company for Cause shall be communicated
                                  by a written notice of termination to the
                                  Executive given in accordance with the notice
                                  provisions of this Agreement.  Such notice
                                  shall indicate the specific termination
                                  provision in this Agreement relied upon,
                                  shall set forth in reasonable detail the
                                  facts and circumstances that






                                       13
<PAGE>   14
                                  provide a basis for termination under the
                                  provision so indicated, and shall specify the
                                  termination date.

                 11.      MISCELLANEOUS PROVISIONS.

                          (a)     No Duty to Mitigate.  The Executive shall not
                                  be required to mitigate the amount of any
                                  severance payment contemplated by this
                                  Agreement (whether by seeking new employment
                                  or otherwise), nor shall any such payment be
                                  reduced by any earnings that the Executive
                                  may receive from any other source.

                          (b)     Waiver.  No provision of this Agreement shall
                                  be modified, waived or discharged unless the
                                  modification, waiver or discharge is agreed
                                  to in writing and signed by the Executive and
                                  by an authorized officer of the Company
                                  (other than the Executive).  No waiver by
                                  either party of any breach of, or compliance
                                  with, any condition or provision of this
                                  Agreement by the other party shall be
                                  considered a waiver of any other condition or
                                  provision or of the same condition or
                                  provision at another time.

                          (c)     Whole Agreement.  No agreements,
                                  representations or understandings (whether
                                  oral or written and whether express or
                                  implied) which are not expressly set forth in
                                  this Agreement have been made or entered into
                                  by either party with respect to the subject
                                  matter hereof.

                          (d)     Choice of Law.  The validity, interpretation,
                                  construction and performance of this
                                  Agreement shall be governed by the laws of
                                  the State of Maryland.

                          (e)     Severability.  The invalidity or
                                  unenforceability of any provision or
                                  provisions of this Agreement shall not effect
                                  the validity or enforceability of any other
                                  provision herein, which shall remain in full
                                  force and effect.

                          (f)     No Assignment of Benefits.  The rights of any
                                  person to payments or benefits under this
                                  Agreement shall not be made subject to option
                                  or assignment, either by voluntary or
                                  involuntary assignment or operation of law,
                                  including, without limitation, bankruptcy,
                                  garnishment, attachment or other creditor's
                                  process, and any action in violation of this
                                  paragraph shall be void.






                                       14
<PAGE>   15
                          (g)     Employment Taxes.  All payments made pursuant
                                  to this Agreement will be subject to
                                  withholding of applicable income and
                                  employment taxes.

                          (h)     Assignment by Company.  The Company may
                                  assign its rights under this Agreement to an
                                  affiliate, and an affiliate may assign its
                                  rights under this Agreement to another
                                  affiliate of the Company or to the Company.

                          (i)     Counterparts.  This Agreement may be executed
                                  in counterparts, each of which shall be
                                  deemed an original, but all of which other
                                  will constitute one and the same instrument.






                                       15
<PAGE>   16
                 IN WITNESS WHEREOF, each of the parties has executed this
Agreement, in the case of the Company by its duly authorized officer, as of the
day and year first above written.



                         ONCOR, INC.                                   
                                                                       
                                                                       
                                                                       
                         By: /s/ Cecil Kost                            
                            --------------------------------------------------
                                                                              
                         Title: President and Chief Operating Officer         
                            --------------------------------------------------
                                                                              
                                                                              
                         EXECUTIVE                                            
                                                                              
                                                                              
                                                                              
                         By: /s/ Stephen Turner                               
                            --------------------------------------------------
                                                                              
                         Title: Chief Executive Officer                       
                            --------------------------------------------------
                                                                              





                                       16

<PAGE>   1
                                                                   EXHIBIT 10.18

                                  ONCOR, INC.
                        MANAGEMENT CONTINUITY AGREEMENT


                 This Management Continuity Agreement (the "Agreement") is made
and entered into effective as of September 29, 1997, by and between Cecil Kost
(the "Executive") and Oncor, Inc., a Maryland corporation (the "Company" or
"Oncor").

                                    RECITALS

                 A.       The Board of Directors of the Company (the "Board")
                          believes that it is in the best interests of the
                          Company and its stockholders to provide the Executive
                          with the incentive to continue his employment with
                          the Company and to motivate the Executive to maximize
                          the value of the Company.

                 B.       The Company has retained Lehman Brothers pursuant to
                          a letter dated June 3, 1997 (the "Lehman Letter"),
                          which contemplates the possibility of an acquisition
                          of the Company by another company or other change of
                          control.  The Board recognizes that such
                          consideration can be a distraction to the Executive
                          and can cause the Executive to consider alternative
                          employment opportunities.  The Board has determined
                          that it is in the best interests of the Company and
                          its stockholders to assure that the Company will have
                          the continued dedication and objectivity of the
                          Executive, notwithstanding the possibility, threat or
                          occurrence of a Change of Control (as defined below)
                          of the Company.  The Board has further determined
                          that it is in the best interests of the Company to
                          provide incentives to the Executive to maximize the
                          value of the Company in anticipation of any Change of
                          Control.

                 C.       The Board believes that it is imperative to provide
                          the Executive with certain benefits upon a Change of
                          Control, which benefits are intended to provide the
                          Executive with financial security and provide
                          sufficient incentive and encouragement to the
                          Executive to remain with the Company notwithstanding
                          the possibility of a Change of Control.

                 D.       The Company and the Executive are currently parties
                          to an employment letter agreement dated March 15,
                          1996 (the "Letter Agreement") and an Agreement
                          relating to confidentiality and non-competition dated
                          March 25, 1996 (the "IP Agreement").  The provisions
                          of the Letter Agreement relating to severance shall
                          apply to all cases except cases relating to a Change
                          of Control and covered by this Agreement, in which
                          case this Agreement shall control.  Except as
                          specifically set forth in this Agreement, the IP
                          Agreement is not being amended or
<PAGE>   2
                          superseded.  No other changes are contemplated or
                          intended to the Letter Agreement or the IP Agreement,
                          each of which shall otherwise remain in full force
                          and effect.

                 E.       To accomplish the foregoing objectives, the Board has
                          directed the Company, upon execution of this
                          Agreement by the Executive, to agree to the terms
                          provided herein.

                 NOW, THEREFORE, in consideration of the mutual covenants
                 herein contained, and in consideration of the continuing
                 employment of the Executive by the Company, the parties agree
                 as follows:

                          1.      DEFINITION OF TERMS.  The following terms
                                  referred to in this Agreement shall have the
                                  following meanings:

                                  (a)         Affiliate.  "Affiliate" means any
                                              corporation, firm or partnership
                                              directly or indirectly controlled
                                              by, controlling or under common
                                              control with the Company.

                                  (b)         Base Compensation. "Base
                                              Compensation" shall mean base
                                              salary of the Executive, as
                                              adjusted from time to time by the
                                              Board, in its discretion.

                                  (c)         Cause.  "Cause" shall mean (i)
                                              any act of personal dishonesty
                                              taken by the Executive in
                                              connection with his
                                              responsibilities as an employee
                                              that is intended to result in
                                              substantial personal enrichment
                                              of the Executive or his
                                              associates at the expense of the
                                              Company or its stockholders, (ii)
                                              committing a felony or an act of
                                              fraud against the Company or its
                                              affiliates, (iii) continued
                                              violations by the Executive of
                                              the Executive's obligations under
                                              this Agreement which are willful
                                              and deliberate on the Executive's
                                              part after there has been
                                              delivered to the Executive a
                                              written demand from the Company
                                              to cease such activities; (iv)
                                              willful refusal by the Executive
                                              to carry out legally permissible
                                              instructions from the Company
                                              after the Executive has been
                                              given written notice by the
                                              Company of a failure to carry out
                                              such instructions and a
                                              reasonable opportunity to correct
                                              the situation; (v) failure of the
                                              Executive to follow written
                                              instructions of the Board after
                                              written notice






<PAGE>   3
                                              of such failure and an
                                              opportunity for Executive for
                                              thirty days to cure any such
                                              failure; (vi) gross negligence in
                                              the performance of the
                                              Executive's duties to the
                                              Company; (vii) repeated errors in
                                              judgment or poor performance that
                                              has subjected or subjects the
                                              Company to, a direct and
                                              significant negative impact on
                                              the Company, its financial status
                                              or business prospects, or (viii)
                                              Executive purposely makes
                                              negative and inaccurate comments
                                              about the Company in
                                              circumstances where such
                                              information becomes available to
                                              the public.

                                  (d)         Change of Control.  "Change of
                                              Control" shall mean a "Sale" of
                                              the Company as defined in the
                                              Lehman Letter, to wit:  A "Sale"
                                              of the Company shall mean any
                                              transaction or series or
                                              combination of transactions,
                                              other than in the ordinary course
                                              of business, whereby, directly or
                                              indirectly, control of or a
                                              majority interest in the Company
                                              or a majority of its assets, is
                                              transferred for consideration,
                                              including, without limitation, by
                                              means of a sale or exchange of
                                              capital stock or assets, a merger
                                              or consolidation, a tender or
                                              exchange offer, a leveraged
                                              buy-out or any similar
                                              transaction.

                                  (e)         Consideration.  "Consideration"
                                              shall mean the gross value of all
                                              cash, securities and other
                                              property paid directly or
                                              indirectly by an acquirer to a
                                              seller or sellers in connection
                                              with a Sale of the Company
                                              (including without limitation all
                                              amounts paid or distributed by
                                              the Company to the holders of
                                              capital stock of the Company and
                                              all amounts paid, distributed or
                                              issued to the holders of options,
                                              warrants, stock appreciation
                                              rights or similar rights or
                                              securities in the Company in
                                              connection with such Sale).  The
                                              value of any such securities
                                              (whether debt or equity) or other
                                              property shall be determined as
                                              follows: (i) the value of
                                              securities that are freely
                                              tradable in an established public
                                              market will be determined on the
                                              basis of the average closing
                                              market price on the last ten (10)
                                              trading days prior to the closing
                                              of such sale or other
                                              transaction; and (ii) the value
                                              of securities that are not freely
                                              tradable or have






                                       3
<PAGE>   4
                                              no established public market, and
                                              the value of consideration that
                                              consists of other property, shall
                                              be the fair market value thereof.
                                              If the consideration to be paid
                                              is computed in any foreign
                                              currency, the value of such
                                              foreign currency for purposes
                                              hereof shall be converted into
                                              U.S. dollars at the prevailing
                                              exchange rate on the date or
                                              dates on which such consideration
                                              is paid.

                                  (f)         Disability.  "Disability" shall
                                              mean that the Executive has been
                                              unable to perform his duties
                                              under this Agreement as the
                                              result of his incapacity due to
                                              physical or mental illness, and
                                              such inability, at least 180 days
                                              after its commencement, is
                                              determined to be permanent by a
                                              physician selected by the Company
                                              or its insurers and is acceptable
                                              to the Executive or the
                                              Executive's legal representative
                                              (agreement regarding
                                              acceptability not to be
                                              unreasonably withheld).
                                              Termination resulting from
                                              Disability may only be effected
                                              after at least 30 days' written
                                              notice to the Executive by the
                                              Company of its intention to
                                              terminate the Executive's
                                              employment.  In the event that
                                              the Executive resumes the
                                              performance of substantially all
                                              of his duties hereunder before
                                              the termination of his employment
                                              becomes effective, and continues
                                              to perform such duties for a
                                              period of at least 60 days, the
                                              notice of intent to terminate
                                              shall automatically be deemed to
                                              have been revoked.

                                  (g)         Involuntary Termination.
                                              "Involuntary Termination" shall
                                              mean the Executive's voluntary
                                              resignation after a Change in
                                              Control within 3 months of the
                                              occurrence of any of the
                                              following events:  (i) without
                                              the Executive's consent, the
                                              significant reduction of the
                                              Executive's duties or the removal
                                              of the Executive from his
                                              position and responsibilities as
                                              set forth in this Agreement; (ii)
                                              without the Executive's consent,
                                              a substantial reduction of the
                                              facilities and perquisites
                                              (including office space, support
                                              staff and location) available to
                                              the Executive unless
                                              substantially all of the
                                              Company's other employees of rank
                                              and responsibilities
                                              substantially similar to those of
                                              the Executive undergo
                                              substantially similar reductions;






                                       4
<PAGE>   5
                                              (iii) a reduction by the Company
                                              in the Base Compensation of the
                                              Executive as in effect
                                              immediately prior to such
                                              reduction unless substantially
                                              all of the Company's other
                                              employees of rank and
                                              responsibilities substantially
                                              similar to those of the Executive
                                              undergo substantially similar
                                              reductions; (iv) a material
                                              reduction by the Company in the
                                              kind or level of employee
                                              benefits to which the Executive
                                              is entitled with the result that
                                              the Executive's overall benefits
                                              package is significantly reduced
                                              unless substantially all of the
                                              Company's other employees of rank
                                              and responsibilities
                                              substantially similar to those of
                                              the Executive undergo
                                              substantially similar reductions;
                                              or (v) the refusal by the
                                              Executive to relocate his
                                              principal place of employment to
                                              a facility or location more than
                                              75 miles from the Executive's
                                              then present location following a
                                              written demand from the Company
                                              to undertake such relocation.  An
                                              Involuntary Termination will also
                                              include (i) any purported
                                              termination of the Executive by
                                              the Company which is not effected
                                              by Disability or for Cause, as
                                              those terms are defined herein,
                                              or any purported termination for
                                              which the grounds relied upon are
                                              not valid under this Agreement,
                                              or (ii) the failure of the
                                              Company to obtain the assumption
                                              of this Agreement by any
                                              successors as contemplated in
                                              Section 8 below.

                 2.       TERM OF AGREEMENT.  This Agreement is effective on
                          the 29th day of September, 1997, and shall continue
                          in effect to and including June 3, 1998, unless
                          extended by mutual agreement in writing (the "Term").

                 3.       EFFECTIVENESS UPON A SALE OF THE COMPANY.   The
                          provisions of Sections 3 through 9 of this Agreement
                          shall become effective if, and only if, a Change in
                          Control occurs and shall be effective from and after
                          the date the Sale triggering a Change in Control
                          occurs (the "Sale Date").

                          (a)     The Executive agrees to remain an Oncor
                          employee (or an employee of Oncor's successor after a
                          sale) until six (6) months after the Sale Date or
                          earlier termination by Oncor (other than in cases of
                          death or Disability).






                                       5
<PAGE>   6
                 4.       SEVERANCE BENEFITS.  The Company shall continue to
                          pay the Executive as compensation for his services
                          his Base Compensation for a period of twenty (20)
                          months after the later of (a) the Sale Date or (b)
                          the date of termination of employment pursuant to
                          Section 3(a) at the request of Oncor or by
                          Involuntary Termination, payable at normal payroll
                          intervals.  These payments will continue after
                          employment ceases if the Executive is terminated
                          without Cause or if the Executive terminates
                          employment as an Involuntary Termination, but not if
                          the Executive terminates employment as other than an
                          Involuntary Termination.

                 5.       EXECUTIVE BENEFITS.  After the Sale Date, the
                          Executive shall be eligible to participate in the
                          employee benefit plans and executive compensation
                          programs maintained by the Company and applicable to
                          other key executives of the Company, including,
                          without limitation, retirement plans, savings or
                          profit-sharing plans, stock options plans, incentive
                          or other bonus plans, life, disability, health,
                          accident and other insurance programs, paid vacations
                          and similar programs or plans, subject in each case
                          to the generally applicable terms and conditions of
                          the applicable plan or program in question, to the
                          determination of any committee administering such
                          program or plan and to the terms of this Agreement.

                 6.       ADDITIONAL SEVERANCE BENEFITS PROVISIONS.

                          (a)     Termination for Cause.  Notwithstanding
                                  anything else contained in this Agreement, if
                                  the Company terminates the Executive's
                                  employment for Cause, then the Executive
                                  shall not be entitled to receive severance or
                                  other benefits pursuant to this Agreement
                                  except for those benefits, if any, as then
                                  established under the Company's then existing
                                  severance and benefit plans and policies at
                                  the time of such termination.

                          (b)     Medical, Life and Disability Benefits.  In
                                  the event and during the term the Executive
                                  is entitled to severance benefits pursuant to
                                  this Agreement, then in addition to such
                                  severance benefits, the Executive shall
                                  receive Company-paid health, life and
                                  disability insurance coverage to the same
                                  extent provided to such Executive immediately
                                  prior to the Executive's termination (the
                                  "Company-Paid Coverage") for Eighteen (18)
                                  months after (i) the later of (A) the Sale
                                  Date or (B) the date of termination of
                                  employment pursuant to Section 3(a) at the
                                  request of Oncor or by Involuntary
                                  Termination; or (ii) until the Executive
                                  becomes covered under another employer's
                                  group health, life or disability






                                       6
<PAGE>   7
                                  insurance plan, whichever occurs first.  If
                                  the Executive's health, life and disability
                                  insurance coverage included the Executive's
                                  dependent(s) immediately prior to the
                                  Executive's termination, such dependent(s)
                                  shall also be covered at Company expense for
                                  the same period during which Executive is
                                  covered.  For purposes of the continuation
                                  health coverage covered under the federal
                                  statute known as COBRA, the date of the
                                  "qualifying event" triggering the Executive's
                                  Election Period (and that of his qualifying
                                  beneficiaries) shall be the last date on
                                  which the Executive receives Company-Paid
                                  Coverage under this Agreement.

                          (c)     Death.  If the Executive's employment is
                                  terminated due to the death of the Executive,
                                  then the Executive shall not be entitled to
                                  receive severance or other benefits pursuant
                                  to this Agreement except for those benefits
                                  (if any) as then established under the
                                  Company's then existing severance and
                                  benefits plans and policies at the time of
                                  death.

                          (d)     Incentive Compensation.  Upon consummation of
                                  a Sale, the Executive shall receive a cash
                                  payment of at least One Hundred and Twenty
                                  Five Thousand Dollars ($125,000) (the
                                  "Payment").  If the Consideration paid in a
                                  Sale of the Company is above One Hundred
                                  Million Dollars ($100,000,000), the Payment
                                  will be increased by .125% of the
                                  Consideration up to One Hundred and Thirty
                                  Million Dollars ($130,000,000), by .175% of
                                  the total Consideration from One Hundred and
                                  Thirty Million Dollars ($130,000,000) to One
                                  Hundred and Sixty-Five Million Dollars
                                  ($165,000,000), and by .25% of the
                                  Consideration in excess of One Hundred and
                                  Sixty Five Million Dollars ($165,000,000).
                                  There will be no payment upon a strategic
                                  transaction as defined in the Lehman Letter.
                                  Such payment shall be made as soon as
                                  reasonably practicable after the Sale Date,
                                  but in any event within 30 days thereafter.

                          (e)     For the avoidance of doubt, nothing in this
                                  Agreement shall amend or affect the full
                                  acceleration of vesting of Executive's stock
                                  options under Oncor's 1992 Stock Option Plan,
                                  as amended (the "Plan"), which occurs upon a
                                  Corporate Transaction, as defined in the
                                  Plan.

                 7.       NO OTHER BENEFIT.  In connection with the provisions
                          in this Agreement, the Executive acknowledges and
                          agrees that he has no






                                       7
<PAGE>   8
                          other claims or agreements relating to remuneration
                          or compensation from the Company other than the
                          Letter Agreement.

                 8.       UNAUTHORIZED DISCLOSURE; PROHIBITED AND COMPETITIVE
                          ACTIVITIES.  The provisions of Sections 1, 2, 3, 5
                          and 6 of the IP Agreement are incorporated by
                          reference and shall apply to this Agreement as
                          specified in Section 3 above.

                 9.       LIMITATION ON PAYMENTS.  To the extent that any of
                          the payments and benefits provided for this Agreement
                          or otherwise payable to the Executive constitute
                          "parachute payments" within the meaning of Section
                          280G of the Internal Revenue Code, as amended, and,
                          but for this Section 9, would be subject to the
                          excise tax provided for by Section 4999 of that Code,
                          then the Executive's benefits under Sections 3
                          through 7 above, as applicable, shall be payable
                          either

                          (a)     in full, or

                          (b)     as to such lesser amount as would result in
                                  no portion of such severance benefits being
                                  subject to the excise tax under Section 4999
                                  of the Code,

                          whichever of the foregoing amounts, taking into
                          account the applicable federal, state and local
                          income taxes and the excise tax imposed under Section
                          4999, results in the receipt by the Executive on an
                          after-tax basis of the greatest amount of severance
                          benefits under Sections 3 through 7 above,
                          notwithstanding that all or some portion of such
                          severance benefits may be taxable under Section 4999.
                          Unless the Company and the Executive otherwise agree
                          in writing, any determination required under this
                          Section 9 shall be made in writing by an independent
                          public accounting firm reasonably acceptable to the
                          Company other than that used by the Company (the
                          "Accountants"), whose determination shall be
                          conclusive and binding upon the Executive and the
                          company for all purposes.  For purposes of making the
                          calculations required by this Section 9, the
                          Accountants may make reasonable assumptions and
                          approximations concerning applicable taxes and may
                          rely on reasonable, good faith interpretations
                          concerning the application of Sections 280G and 4999.
                          The Company and the Executive shall furnish to the
                          Accountants such information and documents as the
                          Accountants may reasonably request in order to make a
                          determination under this Section.  The Company shall
                          bear all costs the Accountants may reasonably incur
                          in connection with any calculations provided for by
                          this Section 9.  Executive may elect at his






                                       8
<PAGE>   9
                          option which such benefits to reduce to meet the
                          requirements of this Section 9.

                 10.      SUCCESSORS.

                          (a)     Company's Successors.  Any successor to the
                                  Company (whether direct or indirect and
                                  whether by purchase of stock, purchase of
                                  assets, lease, merger, consolidation,
                                  liquidation or otherwise) to all or
                                  substantially all of the Company's business
                                  and assets shall assume the obligations under
                                  this Agreement and agree expressly to perform
                                  the obligations under this Agreement in the
                                  same manner and to the same extent as the
                                  Company would be required to perform such
                                  obligations in the absence of a succession.
                                  For all purposes under this Agreement, the
                                  term "Company" shall include any successor to
                                  the Company's business and assets which
                                  executes and delivers the assumption
                                  agreement described in this paragraph or
                                  which becomes bound by the terms of this
                                  Agreement by operation of law.

                          (b)     Executive's Successors.  Except as otherwise
                                  specifically provided in this Agreement, the
                                  terms of this Agreement and all rights of the
                                  Executive hereunder shall inure to the
                                  benefit of, and be enforceable by, the
                                  Executive's personal or legal
                                  representatives, executors, administrators,
                                  successors, heirs, devicees and legatees.

                 11.      NOTICE.

                          (a)     General.  Notices and all other
                                  communications contemplated by this Agreement
                                  shall be in writing and shall be deemed to
                                  have been duly given when personally
                                  delivered or three (3) days after being
                                  mailed by U.S. registered or certified mail,
                                  return receipt requested and postage prepaid.
                                  In the case of the Executive, mailed notices
                                  shall be addressed to him at the home address
                                  which he most recently communicated to the
                                  Company in writing.  In the case of the
                                  Company, mailed notices shall be addressed to
                                  its corporate headquarters, and all notices
                                  shall be directed to the attention of its
                                  Secretary.

                          (b)     Notice of Termination.  Any termination by
                                  the Company for Cause shall be communicated
                                  by a written notice of termination to the
                                  Executive hereto given in accordance with the
                                  notice






                                       9
<PAGE>   10
                                  provisions of this Agreement.  Such notice
                                  shall indicate the specific termination
                                  provision in this Agreement relied upon,
                                  shall set forth in reasonable detail the
                                  facts and circumstances that provide a basis
                                  for termination under the provision so
                                  indicated, and shall specify the termination
                                  date.

                 12.      MISCELLANEOUS PROVISIONS.

                          (a)     Waiver.  No provision of this Agreement shall
                                  be modified, waived or discharged unless the
                                  modification, waiver or discharge is agreed
                                  to in writing and signed by the Executive and
                                  by an authorized officer of the Company
                                  (other than the Executive).  No waiver by
                                  either party of any breach of, or compliance
                                  with, any condition or provision of this
                                  Agreement by the other party shall be
                                  considered a waiver of any other condition or
                                  provision or of the same condition or
                                  provision at another time.

                          (b)     Whole Agreement.  No agreements,
                                  representations or understandings (whether
                                  oral or written and whether express or
                                  implied) which are not expressly set forth in
                                  this Agreement have been made or entered into
                                  by either party with respect to the subject
                                  matter hereof.

                          (c)     Choice of Law.  The validity, interpretation,
                                  construction and performance of this
                                  Agreement shall be governed by the laws of
                                  the State of Maryland.

                          (d)     Severability.  The invalidity or
                                  unenforceability of any provision or
                                  provisions of this Agreement shall not effect
                                  the validity or enforceability of any other
                                  provision herein, which shall remain in full
                                  force and effect.

                          (e)     No Assignment of Benefits.  The rights of any
                                  person to payments or benefits under this
                                  Agreement shall not be made subject to option
                                  or assignment, either by voluntary or
                                  involuntary assignment or operation of law,
                                  including, without limitation, bankruptcy,
                                  garnishment, attachment or other creditor's
                                  process, and any action in violation of this
                                  paragraph shall be void.






                                       10
<PAGE>   11
                          (f)     Employment Taxes.  All payments made pursuant
                                  to this Agreement will be subject to
                                  withholding of applicable income and
                                  employment taxes.

                          (g)     Assignment by Company.  The Company may
                                  assign its rights under this Agreement to an
                                  affiliate, and an affiliate may assign its
                                  rights under this Agreement to another
                                  affiliate of the Company or to the Company.

                          (h)     Counterparts.  This Agreement may be executed
                                  in counterparts, each of which shall be
                                  deemed an original, but all of which other
                                  will constitute one and the same instrument.


                 IN WITNESS WHEREOF, each of the parties has executed this
Agreement, in the case of the Company by its duly authorized officer, as of the
day and year first above written.



                            ONCOR, INC.



                            By: /s/ Stephen Turner
                               -----------------------------------------

                            Title: Chief Executive Officer
                                  --------------------------------------


                            EXECUTIVE



                            By: /s/ Cecil Kost
                               -----------------------------------------

                            Title: President and Chief Operating Officer
                                  --------------------------------------





                                       11

<PAGE>   1
                                                                   EXHIBIT 10.19

                                  ONCOR, INC.
                        MANAGEMENT CONTINUITY AGREEMENT


                 This Management Continuity Agreement (the "Agreement") is made
and entered into effective as of September 29, 1997, by and between John Coker
(the "Executive") and Oncor, Inc., a Maryland corporation (the "Company" or
"Oncor").

                                    RECITALS

                 A.       The Board of Directors of the Company (the "Board")
                          believes that it is in the best interests of the
                          Company and its stockholders to provide the Executive
                          with the incentive to continue his employment with
                          the Company and to motivate the Executive to maximize
                          the value of the Company.

                 B.       The Company has retained Lehman Brothers pursuant to
                          a letter dated June 3, 1997 (the "Lehman Letter"),
                          which contemplates the possibility of an acquisition
                          of the Company by another company or other change of
                          control.  The Board recognizes that such
                          consideration can be a distraction to the Executive
                          and can cause the Executive to consider alternative
                          employment opportunities.  The Board has determined
                          that it is in the best interests of the Company and
                          its stockholders to assure that the Company will have
                          the continued dedication and objectivity of the
                          Executive, notwithstanding the possibility, threat or
                          occurrence of a Change of Control (as defined below)
                          of the Company.  The Board has further determined
                          that it is in the best interests of the Company to
                          provide incentives to the Executive to maximize the
                          value of the Company in anticipation of any Change of
                          Control.

                 C.       The Board believes that it is imperative to provide
                          the Executive with certain benefits upon a Change of
                          Control, which benefits are intended to provide the
                          Executive with financial security and provide
                          sufficient incentive and encouragement to the
                          Executive to remain with the Company notwithstanding
                          the possibility of a Change of Control.

                 D.       The Company and the Executive are currently parties
                          to an employment letter agreement dated January 22,
                          1994 (the "Letter Agreement").  The provisions of the
                          Letter Agreement relating to severance shall apply to
                          all cases except cases relating to a Change of
                          Control and covered by this Agreement, in which case
                          this Agreement shall control.  The Letter Agreement
                          is hereby amended to change the time period during
                          which Executive is entitled to receive the benefits
                          after involuntary termination specified therein from
                          nine months to 18 months.  No other
<PAGE>   2
                          changes are contemplated or intended to the Letter
                          Agreement which shall otherwise remain in full force
                          and effect.

                 E.       To accomplish the foregoing objectives, the Board has
                          directed the Company, upon execution of this
                          Agreement by the Executive, to agree to the terms
                          provided herein.

                 NOW, THEREFORE, in consideration of the mutual covenants
                 herein contained, and in consideration of the continuing
                 employment of the Executive by the Company, the parties agree
                 as follows:

                          1.      DEFINITION OF TERMS.  The following terms
                                  referred to in this Agreement shall have the
                                  following meanings:

                                  (a)      Affiliate.  "Affiliate" means any
                                           corporation, firm or partnership
                                           directly or indirectly controlled
                                           by, controlling or under common
                                           control with the Company.

                                  (b)      Base Compensation. "Base
                                           Compensation" shall mean base salary
                                           of the Executive, as adjusted from
                                           time to time by the Board, in its
                                           discretion.

                                  (c)      Cause.  "Cause" shall mean (i) any
                                           act of personal dishonesty taken by
                                           the Executive in connection with his
                                           responsibilities as an employee that
                                           is intended to result in substantial
                                           personal enrichment of the Executive
                                           or his associates at the expense of
                                           the Company or its stockholders,
                                           (ii) committing a felony or an act
                                           of fraud against the Company or its
                                           affiliates, (iii) continued
                                           violations by the Executive of the
                                           Executive's obligations under this
                                           Agreement which are willful and
                                           deliberate on the Executive's part
                                           after there has been delivered to
                                           the Executive a written demand from
                                           the Company to cease such
                                           activities; (iv) willful refusal by
                                           the Executive to carry out legally
                                           permissible instructions from the
                                           Company after the Executive has been
                                           given written notice by the Company
                                           of a failure to carry out such
                                           instructions and a reasonable
                                           opportunity to correct the
                                           situation; (v) failure of the
                                           Executive to follow written
                                           instructions of the Board after
                                           written notice of such failure and
                                           an opportunity for Executive for
                                           thirty days to cure any such
                                           failure; (vi) gross negligence in
                                           the






<PAGE>   3
                                           performance of the Executive's
                                           duties to the Company; (vii)
                                           repeated errors in judgment or poor
                                           performance that has subjected or
                                           subjects the Company to, a direct
                                           and significant negative impact on
                                           the Company, its financial status or
                                           business prospects, or (viii)
                                           Executive purposely makes negative
                                           and inaccurate comments about the
                                           Company in circumstances where such
                                           information becomes available to the
                                           public.

                                  (d)      Change of Control.  "Change of
                                           Control" shall mean a "Sale" of the
                                           Company as defined in the Lehman
                                           Letter, to wit:  A "Sale" of the
                                           Company shall mean any transaction
                                           or series or combination of
                                           transactions, other than in the
                                           ordinary course of business,
                                           whereby, directly or indirectly,
                                           control of or a majority interest in
                                           the Company or a majority of its
                                           assets, is transferred for
                                           consideration, including, without
                                           limitation, by means of a sale or
                                           exchange of capital stock or assets,
                                           a merger or consolidation, a tender
                                           or exchange offer, a leveraged
                                           buy-out or any similar transaction.

                                  (e)      Consideration.  "Consideration"
                                           shall mean the gross value of all
                                           cash, securities and other property
                                           paid directly or indirectly by an
                                           acquirer to a seller or sellers in
                                           connection with a Sale of the
                                           Company (including without
                                           limitation all amounts paid or
                                           distributed by the Company to the
                                           holders of capital stock of the
                                           Company and all amounts paid,
                                           distributed or issued to the holders
                                           of options, warrants, stock
                                           appreciation rights or similar
                                           rights or securities in the Company
                                           in connection with such Sale).  The
                                           value of any such securities
                                           (whether debt or equity) or other
                                           property shall be determined as
                                           follows: (i) the value of securities
                                           that are freely tradable in an
                                           established public market will be
                                           determined on the basis of the
                                           average closing market price on the
                                           last ten (10) trading days prior to
                                           the closing of such sale or other
                                           transaction; and (ii) the value of
                                           securities that are not freely
                                           tradable or have no established
                                           public market, and the value of
                                           consideration that consists of other
                                           property, shall be the fair market
                                           value thereof.  If the consideration
                                           to be paid is computed in any
                                           foreign currency, the value of such
                                           foreign currency for purposes hereof
                                           shall be converted into U.S. dollars
                                           at the






                                       3
<PAGE>   4
                                           prevailing exchange rate on the date
                                           or dates on which such consideration
                                           is paid.

                                  (f)      Disability.  "Disability" shall mean
                                           that the Executive has been unable
                                           to perform his duties under this
                                           Agreement as the result of his
                                           incapacity due to physical or mental
                                           illness, and such inability, at
                                           least 180 days after its
                                           commencement, is determined to be
                                           permanent by a physician selected by
                                           the Company or its insurers and is
                                           acceptable to the Executive or the
                                           Executive's legal representative
                                           (agreement regarding acceptability
                                           not to be unreasonably withheld).
                                           Termination resulting from
                                           Disability may only be effected
                                           after at least 30 days' written
                                           notice to the Executive by the
                                           Company of its intention to
                                           terminate the Executive's
                                           employment.  In the event that the
                                           Executive resumes the performance of
                                           substantially all of his duties
                                           hereunder before the termination of
                                           his employment becomes effective,
                                           and continues to perform such duties
                                           for a period of at least 60 days,
                                           the notice of intent to terminate
                                           shall automatically be deemed to
                                           have been revoked.

                                  (g)      Involuntary Termination.
                                           "Involuntary Termination" shall mean
                                           the Executive's voluntary
                                           resignation after a Change in
                                           Control within 3 months of the
                                           occurrence of any of the following
                                           events:  (i) without the Executive's
                                           consent, the significant reduction
                                           of the Executive's duties or the
                                           removal of the Executive from his
                                           position and responsibilities as set
                                           forth in this Agreement; (ii)
                                           without the Executive's consent, a
                                           substantial reduction of the
                                           facilities and perquisites
                                           (including office space, support
                                           staff and location) available to the
                                           Executive unless substantially all
                                           of the Company's other employees of
                                           rank and responsibilities
                                           substantially similar to those of
                                           the Executive undergo substantially
                                           similar reductions; (iii) a
                                           reduction by the Company in the Base
                                           Compensation of the Executive as in
                                           effect immediately prior to such
                                           reduction unless substantially all
                                           of the Company's other employees of
                                           rank and responsibilities
                                           substantially similar to those of
                                           the Executive undergo substantially
                                           similar reductions; (iv) a material
                                           reduction by the Company in the kind
                                           or level of employee benefits to
                                           which the Executive is entitled with
                                           the result that the






                                       4
<PAGE>   5
                                           Executive's overall benefits package
                                           is significantly reduced unless
                                           substantially all of the Company's
                                           other employees of rank and
                                           responsibilities substantially
                                           similar to those of the Executive
                                           undergo substantially similar
                                           reductions; or (v) the refusal by
                                           the Executive to relocate his
                                           principal place of employment to a
                                           facility or location more than 75
                                           miles from the Executive's then
                                           present location following a written
                                           demand from the Company to undertake
                                           such relocation.  An Involuntary
                                           Termination will also include (i)
                                           any purported termination of the
                                           Executive by the Company which is
                                           not effected by Disability or for
                                           Cause, as those terms are defined
                                           herein, or any purported termination
                                           for which the grounds relied upon
                                           are not valid under this Agreement,
                                           or (ii) the failure of the Company
                                           to obtain the assumption of this
                                           Agreement by any successors as
                                           contemplated in Section 10 below.

                 2.       TERM OF AGREEMENT.  This Agreement is effective on
                          the 29th day of September, 1997, and shall continue
                          in effect to and including June 3, 1998, unless
                          extended by mutual agreement in writing (the "Term").

                 3.       EFFECTIVENESS UPON A SALE OF THE COMPANY.   The
                          provisions of Sections 3 through 8 of this Agreement
                          shall become effective if, and only if, a Change in
                          Control occurs and shall be effective from and after
                          the date the Sale triggering a Change in Control
                          occurs (the "Sale Date").

                          (a)     The Executive agrees to remain an Oncor
                          employee (or an employee of Oncor's successor after a
                          sale) until six (6) months after the Sale Date or
                          earlier termination by Oncor (other than in cases of
                          death or Disability).

                 4.       SEVERANCE BENEFITS.  The Company shall continue to
                          pay the Executive as compensation for his services
                          his Base Compensation for a period of eighteen (18)
                          months after the later of (a) the Sale Date or (b)
                          the date of termination of employment pursuant to
                          Section 3(a) at the request of Oncor or by
                          Involuntary Termination, payable at normal payroll
                          intervals.  These payments will continue after
                          employment ceases if the Executive is terminated
                          without Cause or if the Executive terminates
                          employment as an Involuntary Termination, but not if
                          the Executive terminates employment as other than an
                          Involuntary Termination.






                                       5
<PAGE>   6
                 5.       EXECUTIVE BENEFITS.  After the Sale Date, the
                          Executive shall be eligible to participate in the
                          employee benefit plans and executive compensation
                          programs maintained by the Company and applicable to
                          other key executives of the Company, including,
                          without limitation, retirement plans, savings or
                          profit-sharing plans, stock options plans, incentive
                          or other bonus plans, life, disability, health,
                          accident and other insurance programs, paid vacations
                          and similar programs or plans, subject in each case
                          to the generally applicable terms and conditions of
                          the applicable plan or program in question, to the
                          determination of any committee administering such
                          program or plan and to the terms of this Agreement.

                 6.       ADDITIONAL SEVERANCE BENEFITS PROVISIONS.

                          (a)     Termination for Cause.  Notwithstanding
                                  anything else contained in this Agreement, if
                                  the Company terminates the Executive's
                                  employment for Cause, then the Executive
                                  shall not be entitled to receive severance or
                                  other benefits pursuant to this Agreement
                                  except for those benefits, if any, as then
                                  established under the Company's then existing
                                  severance and benefit plans and policies at
                                  the time of such termination.

                          (b)     Medical, Life and Disability Benefits.  In
                                  the event and during the term the Executive
                                  is entitled to severance benefits pursuant to
                                  this Agreement, then in addition to such
                                  severance benefits, the Executive shall
                                  receive Company-paid health, life and
                                  disability insurance coverage to the same
                                  extent provided to such Executive immediately
                                  prior to the Executive's termination (the
                                  "Company-Paid Coverage") for Eighteen (18)
                                  months after (i) the later of (A) the Sale
                                  Date or (B) the date of termination of
                                  employment pursuant to Section 3(a) at the
                                  request of Oncor or by Involuntary
                                  Termination; or (ii) until the Executive
                                  becomes covered under another employer's
                                  group health, life or disability insurance
                                  plan, whichever occurs first.  If the
                                  Executive's health, life and disability
                                  insurance coverage included the Executive's
                                  dependent(s) immediately prior to the
                                  Executive's termination, such dependent(s)
                                  shall also be covered at Company expense for
                                  the same period during which Executive is
                                  covered.  For purposes of the continuation
                                  health coverage covered under the federal
                                  statute known as COBRA, the date of the
                                  "qualifying event" triggering the Executive's
                                  Election Period (and that of his qualifying
                                  beneficiaries) shall be the last date on
                                  which the






                                       6
<PAGE>   7
                                  Executive receives Company-Paid Coverage
                                  under this Agreement.

                          (c)     Death.  If the Executive's employment is
                                  terminated due to the death of the Executive,
                                  then the Executive shall not be entitled to
                                  receive severance or other benefits pursuant
                                  to this Agreement except for those benefits
                                  (if any) as then established under the
                                  Company's then existing severance and
                                  benefits plans and policies at the time of
                                  death.

                          (d)     Incentive Compensation.  Upon consummation of
                                  a Sale, the Executive shall receive a cash
                                  payment of at least One Hundred and Twenty
                                  Five Thousand Dollars ($125,000) (the
                                  "Payment").  If the Consideration paid in a
                                  Sale of the Company is above One Hundred
                                  Million Dollars ($100,000,000), the Payment
                                  will be increased by .125% of the
                                  Consideration up to One Hundred and Thirty
                                  Million Dollars ($130,000,000), by .175% of
                                  the total Consideration from One Hundred and
                                  Thirty Million Dollars ($130,000,000) to One
                                  Hundred and Sixty-Five Million Dollars
                                  ($165,000,000), and by .25% of the
                                  Consideration in excess of One Hundred and
                                  Sixty Five Million Dollars ($165,000,000).
                                  There will be no payment upon a strategic
                                  transaction as defined in the Lehman Letter.
                                  Such payment shall be made as soon as
                                  reasonably practicable after the Sale Date,
                                  but in any event within 30 days thereafter.

                          (e)     For the avoidance of doubt, nothing in this
                                  Agreement shall amend or affect the full
                                  acceleration of vesting of Executive's stock
                                  options under Oncor's 1992 Stock Option Plan,
                                  as amended (the "Plan"), which occurs upon a
                                  Corporate Transaction, as defined in the
                                  Plan.

                 7.       NO OTHER BENEFIT.  In connection with the provisions
                          in this Agreement, the Executive acknowledges and
                          agrees that he has no other claims or agreements
                          relating to remuneration or compensation from the
                          Company other than the Letter Agreement.

                 8.       UNAUTHORIZED DISCLOSURE; PROHIBITED AND COMPETITIVE
                          ACTIVITIES.

                          (a)     The Executive understands and agrees that due
                                  to the Executive's position with the Company,
                                  both prior to and subsequent to the effective
                                  date of this Agreement, the Executive has
                                  been and will be exposed to, and has received
                                  and






                                       7
<PAGE>   8
                                  will receive, confidential and proprietary
                                  information of the company relating to the
                                  Company's business affairs (collectively, the
                                  "Trade Secrets"), including, but not limited
                                  to, technical information, product
                                  information and formulae, processes, business
                                  and marketing plans, strategies, customer
                                  information, other information concerning the
                                  Company's products, promotions, development,
                                  financing, expansion plans, business policies
                                  and practices, salaries and benefits, and
                                  other forms of information considered by the
                                  Company to be proprietary and confidential
                                  and in the nature of trade secrets.  Except
                                  to the extent that the proper performance of
                                  the Executive's duties, services and
                                  responsibilities hereunder may require
                                  disclosure, and except as such information
                                  (i) was known to the Executive prior to his
                                  employment by the Company, or (ii) was or
                                  becomes generally available to the public
                                  other than as a result of a disclosure by the
                                  Executive in violation of the provisions of
                                  this paragraph, the Executive agrees that
                                  during his employment with the Company and at
                                  all times thereafter the Executive will keep
                                  such Trade Secrets confidential and will not
                                  disclose such information, either directly or
                                  indirectly, to any third person or entity
                                  without the prior written consent of the
                                  Company or use such information for the
                                  benefit of himself or any third person or
                                  entity without the prior written consent of
                                  the Company.  This confidentiality
                                  restriction, has no temporal, geographical or
                                  territorial restrict, provided, however, that
                                  if in the written opinion of counsel, the
                                  Executive is legally compelled to disclose
                                  Trade Secrets to any tribunal of only those
                                  Trade Secrets which such counsel advises in
                                  writing are legally required to be disclosed
                                  shall not constitute a Prohibited Activity
                                  provided that the Executive shall give the
                                  Company as much advance notice of such
                                  disclosure as is reasonably practicable.

                          (b)     On the effective date of any termination of
                                  the Executive's employment with the Company,
                                  the Executive will promptly supply to the
                                  Company all property, including, but not
                                  limited to, keys, notes, memoranda, writings,
                                  lists, files, reports, customer lists,
                                  correspondence, tapes, disks, cards, surveys,
                                  maps, logs, machines, technical data,
                                  formulae, or any other tangible product or
                                  document, and any and all copies, duplicates
                                  or reproductions thereof, which has been
                                  produced by, received by or otherwise
                                  submitted to the Executive in the course of
                                  his employment with the Company.






                                       8
<PAGE>   9
                          (c)     The Executive and the Company recognize that
                                  due to the nature of the Executive's position
                                  with the Company and the relationship of the
                                  Executive and the Company, both prior to and
                                  subsequent to the date of this Agreement, the
                                  Executive has had and will have access to,
                                  has had and will acquire, and has assisted
                                  and may continue to assist in developing
                                  confidential and proprietary information
                                  relating to the business and operations of
                                  the Company and its affiliates, including
                                  Trade Secrets.  The Executive acknowledges
                                  that such information has been and will be of
                                  central importance to the business of the
                                  Company and its affiliates and that
                                  disclosure of it to, or its use by, others
                                  (including, without limitation, the
                                  Executive, other than in furtherance of the
                                  Company's business and affairs ), could cause
                                  substantial loss to the Company.  The
                                  Executive and the Company also recognize that
                                  an important part of the Executive's duties
                                  has been to develop goodwill for the Company
                                  and its affiliates through his personal
                                  contact with Customers (as defined below),
                                  employees, and others having business
                                  relationships with the Company, and that
                                  there is a danger that this goodwill, a
                                  proprietary asset of the Company, may follow
                                  the Executive if and when his relationship
                                  with the Company is terminated.  The
                                  Executive accordingly agrees that, during the
                                  balance of his employment with the Company,
                                  and for a period of one (1) year after the
                                  Sale Date, he will not:

                                  (i)      directly or indirectly, whether for
                                           his own account or for the account
                                           of any other person or entity,
                                           solicit, divert, or endeavor to
                                           entice away Customers from the
                                           Company or any entity controlled by
                                           the Company, or otherwise engage in
                                           any activity intended to terminate,
                                           disrupt, or interfere with the
                                           Company's or any of its affiliates'
                                           relationship with Customers, or
                                           otherwise adversely affect the
                                           Company's or any of its affiliates'
                                           relationship with Customers or other
                                           business relationships of the
                                           Company or any affiliate thereof;

                                  (ii)     publish or make any statement
                                           critical of the Company or any
                                           shareholder, officer, director or
                                           affiliate, or in any way adversely
                                           affect or otherwise malign the
                                           business or personal reputation of
                                           any of such parties;

                                  (iii)    directly or indirectly solicit any
                                           person who, at the time of such
                                           solicitation, is employed by the
                                           Company or any






                                       9
<PAGE>   10
                                           affiliate thereof, for employment at
                                           any employer other than the Company,
                                           or recommend to any subsequent
                                           employer of the Executive the
                                           solicitation for employment of any
                                           such employee of the company or
                                           affiliate;

                                  (iv)     engage in any "Competitive
                                           Activity," as defined below.

                          (d)     Customers.  "Customers" shall mean those
                                  persons or entities who, at any time during
                                  the Executive's employment with the Company,
                                  and/or during the period one (1) year after
                                  the termination of the Executive's
                                  employment, are or were customers or clients
                                  of the Company or any affiliate thereof or
                                  any predecessor of any of the foregoing.

                          (e)     Competitive Activity.  "Competitive Activity"
                                  means engaging in any of the following
                                  activities, singly or in any combination:

                                  (i)      serving as a director of a
                                           "Competitor" (as defined below);

                                  (ii)     directly or indirectly either
                                           controlling any Competitor, or
                                           owning any equity or debt interests
                                           in any Competitor (other than equity
                                           or debt interests which are publicly
                                           traded and, at the time of any
                                           acquisition, do not exceed five
                                           percent (5%) of the particular class
                                           of interests outstanding, it being
                                           understood that, if interests in any
                                           Competitor are owned by an
                                           investment vehicle or other entity
                                           in which the Executive owns an
                                           equity interest, a portion of the
                                           interests in such Competitor owned
                                           by such entity shall be attributed
                                           to the Executive, such portion shall
                                           be determined by applying the
                                           percentage of the equity interest in
                                           such entity owned by the Executive
                                           to the interests in such Competitor
                                           owned by such entity);

                                  (iii)    employment by, including serving as
                                           an officer or partner of, providing
                                           consulting services to (including,
                                           without limitation, as an
                                           independent contractor), or,
                                           managing or operating the business
                                           or affairs of any Competitor; or






                                       10
<PAGE>   11
                                  (iv)     participating in the ownership,
                                           management, operation or control of
                                           or being connected in any manner
                                           with any Competitor.

                          (f)     Competitor.  "Competitor" means any person
                                  (other than the Company or any of its
                                  affiliates) that competes, either directly or
                                  indirectly, with any of the business
                                  conducted by the Company or any of its
                                  affiliates in the United States, such
                                  business being, without limitation, those
                                  related to the development, production and
                                  marketing of cancer-oriented genetic probes,
                                  related reagents, molecular biology products
                                  and diagnostic products for the detection and
                                  management of certain cancers.

                          (g)     Remedies.  The Executive agrees that any
                                  breach of the terms of this Section 8 would
                                  result in irreparable injury and damage to
                                  the Company for which the Company would have
                                  no adequate remedy at law; the Executive
                                  therefore also agrees that in the event of
                                  said breach or any threatened breach, the
                                  Company shall be entitled to an immediate
                                  inunction and restraining order to prevent
                                  such breach and/or threatened breach and/or
                                  continued breach by the Executive and/or any
                                  and all persons and/or entities acting for
                                  and/or with the Executive, without having to
                                  prove damages, in addition to any other
                                  remedies to which the Company may be entitled
                                  at law or in equity.  The terms of this
                                  paragraph shall not prevent the Company from
                                  pursuing any other available remedies for any
                                  breach or threatened breach hereof,
                                  including, without limitation, the recovery
                                  of damages from the Executive.  The Company
                                  shall have the right to seek injunctive or
                                  other relief for the breach or threatened
                                  breach by the Executive of this Section 8 in
                                  any court of competent jurisdiction.  The
                                  provisions of this Section 8 shall survive
                                  any termination of this Agreement.  The
                                  existence of any claim or cause of action by
                                  the Executive against the Company, whether
                                  predicated on this Agreement or otherwise,
                                  shall not constitute a defense to the
                                  enforcement by the Company of the covenants
                                  and agreements in this Section 8.

                 9.       LIMITATION ON PAYMENTS.  To the extent that any of
                          the payments and benefits provided for this Agreement
                          or otherwise payable to the Executive constitute
                          "parachute payments" within the meaning of Section
                          280G of the Internal Revenue Code, as amended, and,
                          but for this Section 9, would be subject to the
                          excise tax provided for by






                                       11
<PAGE>   12
                          Section 4999 of that Code, then the Executive's
                          benefits under Sections 3 through 7 above, as
                          applicable, shall be payable either

                          (a)     in full, or

                          (b)     as to such lesser amount as would result in
                                  no portion of such severance benefits being
                                  subject to the excise tax under Section 4999
                                  of the Code,

                          whichever of the foregoing amounts, taking into
                          account the applicable federal, state and local
                          income taxes and the excise tax imposed under Section
                          4999, results in the receipt by the Executive on an
                          after-tax basis of the greatest amount of severance
                          benefits under Sections 3 through 7 above,
                          notwithstanding that all or some portion of such
                          severance benefits may be taxable under Section 4999.
                          Unless the Company and the Executive otherwise agree
                          in writing, any determination required under this
                          Section 9 shall be made in writing by an independent
                          public accounting firm reasonably acceptable to the
                          Company other than that used by the Company (the
                          "Accountants"), whose determination shall be
                          conclusive and binding upon the Executive and the
                          Company for all purposes.  For purposes of making the
                          calculations required by this Section 9, the
                          Accountants may make reasonable assumptions and
                          approximations concerning applicable taxes and may
                          rely on reasonable, good faith interpretations
                          concerning the application of Sections 280G and 4999.
                          The Company and the Executive shall furnish to the
                          Accountants such information and documents as the
                          Accountants may reasonably request in order to make a
                          determination under this Section.  The Company shall
                          bear all costs the Accountants may reasonably incur
                          in connection with any calculations provided for by
                          this Section 9.  Executive may elect at his option
                          which such benefits to reduce to meet the
                          requirements of Section 9.

                 10.      SUCCESSORS.

                          (a)     Company's Successors.  Any successor to the
                                  Company (whether direct or indirect and
                                  whether by purchase of stock, purchase of
                                  assets, lease, merger, consolidation,
                                  liquidation or otherwise) to all or
                                  substantially all of the Company's business
                                  and assets shall assume the obligations under
                                  this Agreement and agree expressly to perform
                                  the obligations under this Agreement in the
                                  same manner and to the same extent as the
                                  Company would be required to perform such
                                  obligations in the






                                       12
<PAGE>   13
                                  absence of a succession.  For all purposes
                                  under this Agreement, the term "Company"
                                  shall include any successor to the Company's
                                  business and assets which executes and
                                  delivers the assumption agreement described
                                  in this paragraph or which becomes bound by
                                  the terms of this Agreement by operation of
                                  law.

                          (b)     Executive's Successors.  Except as otherwise
                                  specifically provided in this Agreement, the
                                  terms of this Agreement and all rights of the
                                  Executive hereunder shall inure to the
                                  benefit of, and be enforceable by, the
                                  Executive's personal or legal
                                  representatives, executors, administrators,
                                  successors, heirs, devicees and legatees.

                 11.      NOTICE.

                          (a)     General.  Notices and all other
                                  communications contemplated by this Agreement
                                  shall be in writing and shall be deemed to
                                  have been duly given when personally
                                  delivered or three (3) days after being
                                  mailed by U.S. registered or certified mail,
                                  return receipt requested and postage prepaid.
                                  In the case of the Executive, mailed notices
                                  shall be addressed to him at the home address
                                  which he most recently communicated to the
                                  Company in writing.  In the case of the
                                  Company, mailed notices shall be addressed to
                                  its corporate headquarters, and all notices
                                  shall be directed to the attention of its
                                  Secretary.

                          (b)     Notice of Termination.  Any termination by
                                  the Company for Cause shall be communicated
                                  by a written notice of termination to the
                                  Executive hereto given in accordance with the
                                  notice provisions of this Agreement.  Such
                                  notice shall indicate the specific
                                  termination provision in this Agreement
                                  relied upon, shall set forth in reasonable
                                  detail the facts and circumstances that
                                  provide a basis for termination under the
                                  provision so indicated, and shall specify the
                                  termination date.

                 12.      MISCELLANEOUS PROVISIONS.

                          (a)     Waiver.  No provision of this Agreement shall
                                  be modified, waived or discharged unless the
                                  modification, waiver or discharge is agreed
                                  to in writing and signed by the Executive and
                                  by an authorized officer of the Company
                                  (other than the Executive).  No waiver by
                                  either party of any breach of, or






                                       13
<PAGE>   14
                                  compliance with, any condition or provision
                                  of this Agreement by the other party shall be
                                  considered a waiver of any other condition or
                                  provision or of the same condition or
                                  provision at another time.

                          (b)     Whole Agreement.  No agreements,
                                  representations or understandings (whether
                                  oral or written and whether express or
                                  implied) which are not expressly set forth in
                                  this Agreement have been made or entered into
                                  by either party with respect to the subject
                                  matter hereof.

                          (c)     Choice of Law.  The validity, interpretation,
                                  construction and performance of this
                                  Agreement shall be governed by the laws of
                                  the State of Maryland.

                          (d)     Severability.  The invalidity or
                                  unenforceability of any provision or
                                  provisions of this Agreement shall not effect
                                  the validity or enforceability of any other
                                  provision herein, which shall remain in full
                                  force and effect.

                          (e)     No Assignment of Benefits.  The rights of any
                                  person to payments or benefits under this
                                  Agreement shall not be made subject to option
                                  or assignment, either by voluntary or
                                  involuntary assignment or operation of law,
                                  including, without limitation, bankruptcy,
                                  garnishment, attachment or other creditor's
                                  process, and any action in violation of this
                                  paragraph shall be void.

                          (f)     Employment Taxes.  All payments made pursuant
                                  to this Agreement will be subject to
                                  withholding of applicable income and
                                  employment taxes.

                          (g)     Assignment by Company.  The Company may
                                  assign its rights under this Agreement to an
                                  affiliate, and an affiliate may assign its
                                  rights under this Agreement to another
                                  affiliate of the Company or to the Company.






                                       14
<PAGE>   15
                          (h)     Counterparts.  This Agreement may be executed
                                  in counterparts, each of which shall be
                                  deemed an original, but all of which other
                                  will constitute one and the same instrument.


                 IN WITNESS WHEREOF, each of the parties has executed this
Agreement, in the case of the Company by its duly authorized officer, as of the
day and year first above written.



                            ONCOR, INC.



                            By: /s/ Cecil Kost
                               -------------------------------------------

                            Title: President and Chief Operating Officer
                                  ----------------------------------------


                            EXECUTIVE



                            By: /s/ John L. Coker
                               -------------------------------------------

                            Title: Vice President
                                  ----------------------------------------





                                       15

<PAGE>   1
                                                                      EXHIBIT 23



                     CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation of
our reports included in this Amendment No. 1 to Form 10-K, into the Company's
previously filed S-3 Registration Statement File Nos. 333-00085, 333-00735,
333-11997, 333-20425, and 333-46855, and into S-8 Registration Statement File
Nos. 333-00063, 33-83830, and 33-81021.





                                                 /s/ ARTHUR ANDERSEN LLP


Washington, D.C.
May 20, 1998






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