NEOPROBE CORP
10-Q, 1998-05-15
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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<PAGE>   1
                     U.S. SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   -----------

                                    FORM 10-Q

    (MARK ONE)

     -----      QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE
       X                 SECURITIES EXCHANGE ACT OF 1934
     -----
                 FOR THE QUARTERLY PERIOD ENDED: MARCH 31, 1998

                                       OR

     -----     TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE
                                  EXCHANGE ACT
     -----
                 FOR THE TRANSITION PERIOD FROM ______ TO______


                         COMMISSION FILE NUMBER: 0-26520

                              NEOPROBE CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)

           DELAWARE                                     31-1080091
(State or Other Jurisdiction of             (I.R.S. Employer Identification No.)
Incorporation or Organization)

              425 METRO PLACE NORTH, SUITE 300, DUBLIN, OHIO 43017
                    (Address of Principal Executive Offices)


        REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 614-793-7500

Indicate by check 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
                                 -----           -----

          22,835,705 SHARES OF COMMON STOCK, PAR VALUE $.001 PER SHARE
             (Number of shares of issuer's common equity outstanding
                  as of the close of business on May 8, 1998)
<PAGE>   2
                         PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

<TABLE>
                       NEOPROBE CORPORATION AND SUBSIDIARIES
                           (A DEVELOPMENT STAGE COMPANY)
                            CONSOLIDATED BALANCE SHEETS
<CAPTION>
                                                      DECEMBER 31,      MARCH 31,
                                                         1997             1998
                                                      ------------     -----------
<S>                                                    <C>             <C>        
ASSETS

Current assets:
  Cash and cash equivalents                            $ 9,921,025     $ 8,344,484
  Available-for-sale securities                         14,672,496       9,552,165
  Accounts receivable                                      793,376         676,314
  Inventory                                                413,024       1,189,182
  Note receivable                                        1,500,000               0
  Prepaid expenses and other current assets              2,001,378       1,533,920
                                                       -----------     -----------

    Total current assets                                29,301,299      21,296,065
                                                       -----------     -----------

Property and equipment at cost:
  Equipment, net of accumulated depreciation             6,667,763       7,394,881
  Construction in progress                               3,757,133       4,012,266
                                                       -----------     -----------

                                                        10,424,896      11,407,147
                                                       -----------     -----------

Intangible assets, net of accumulated amortization       1,715,834       1,726,433
Other assets                                               131,375       1,630,005
                                                       -----------     -----------

    Total assets                                       $41,573,404     $36,059,650
                                                       ===========     ===========
</TABLE>

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

                                       2
<PAGE>   3
<TABLE>
                              NEOPROBE CORPORATION AND SUBSIDIARIES
                                  (A DEVELOPMENT STAGE COMPANY)
                                   CONSOLIDATED BALANCE SHEETS

<CAPTION>
                                                                 DECEMBER 31,        MARCH 31,
                                                                    1997               1998
                                                                 ------------      ------------
<S>                                                              <C>               <C>         
LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
  Accounts payable                                               $  3,848,172      $  3,052,484
  Accrued expenses                                                  2,743,293         2,745,298
  Notes payable to finance company                                    202,615           136,096
  Capital lease obligation, current                                   156,140           140,062
                                                                 ------------      ------------

    Total current liabilities                                       6,950,220         6,073,940
                                                                 ------------      ------------

  Long term debt                                                    1,813,437         4,159,031
  Capital lease obligation                                            255,355           230,744
                                                                 ------------      ------------

    Total liabilities                                               9,019,012        10,463,715
                                                                 ------------      ------------

Commitments and contingencies

Stockholders' equity:
  Preferred stock; $.001 par value; 5,000,000 shares
    authorized at December 31, 1997 and March 31, 1998;
    none outstanding (500,000 shares designated as Series A,
    $.001 par value, at March 31, 1998; none outstanding)                   0                 0
  Common stock; $.001 par value; 50,000,000 shares
    authorized; 22,763,430 shares issued and outstanding at
    December 31, 1997; 22,807,055 shares issued and
    outstanding at March 31, 1998                                      22,763            22,807
  Additional paid in capital                                      120,034,876       120,149,176
  Deficit accumulated during the development stage                (87,362,531)      (94,426,143)
  Accumulated other comprehensive loss                               (140,716)         (149,905)
                                                                 ------------      ------------

    Total stockholders' equity                                     32,554,392        25,595,935
                                                                 ------------      ------------

      Total liabilities and stockholders' equity                 $ 41,573,404      $ 36,059,650
                                                                 ============      ============
</TABLE>

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

                                       3
<PAGE>   4
<TABLE>
                                NEOPROBE CORPORATION AND SUBSIDIARIES
                                    (A DEVELOPMENT STAGE COMPANY)
                                CONSOLIDATED STATEMENTS OF OPERATIONS
<CAPTION>
                                                                                     NOVEMBER 16,
                                                        THREE MONTHS ENDED               1983
                                                             MARCH 31,              (INCEPTION) TO
                                                       1997             1998        MARCH 31, 1998
                                                   -----------      -----------     --------------
<S>                                                <C>              <C>              <C>          
Net sales                                          $ 1,124,974      $   863,891      $  10,050,805
Cost of goods sold                                     492,941          224,473          3,928,469
                                                   -----------      -----------      -------------
  Gross profit                                         632,033          639,418          6,122,336
                                                   -----------      -----------      -------------

Operating expenses:
  Research and development                           3,450,934        5,226,696         69,782,834
  Marketing and selling                                856,905        1,095,977          6,934,283
  General and administrative                         1,634,282        1,604,602         32,684,217
                                                   -----------      -----------      -------------
    Total operating expenses                         5,942,121        7,927,275        109,401,334
                                                   -----------      -----------      -------------

Loss from operations                                (5,310,088)      (7,287,857)      (103,278,998)
                                                   -----------      -----------      -------------

Other income (expenses):
  Interest income                                      584,603          254,091          6,176,271
  Interest expense                                      (6,152)         (10,623)          (578,108)
  Other                                                  5,709          (19,223)         3,254,692
                                                   -----------      -----------      -------------
    Total other income                                 584,160          224,245          8,852,855
                                                   -----------      -----------      -------------

Net loss                                           $(4,725,928)     $(7,063,612)     $ (94,426,143)
                                                   ===========      ===========      =============

Net loss per  common share (basic and diluted)     $     (0.21)     $     (0.31)
                                                   ===========      ===========

Weighted average shares
   outstanding during the period                    22,652,473       22,799,277
                                                   ===========      ===========
</TABLE>

<TABLE>
                             NEOPROBE CORPORATION AND SUBSIDIARIES
                                 (A DEVELOPMENT STAGE COMPANY)
                         CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
<CAPTION>
                                                                                 NOVEMBER 16,
                                                    THREE MONTHS ENDED              1983
                                                         MARCH 31,              (INCEPTION) TO
                                                   1997             1998        MARCH 31, 1998
                                               -----------      -----------     --------------
<S>                                            <C>              <C>              <C>          
Net loss                                       $(4,725,928)     $(7,063,612)     $(94,426,143)
Other  comprehensive  losses, net of taxes        (189,492)          (9,189)         (149,905)
                                               -----------      -----------      ------------
Comprehensive loss                             $(4,915,420)     $(7,072,801)     $(94,576,048)
                                               ===========      ===========      ============
</TABLE>

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

                                        4
<PAGE>   5
<TABLE>
                                    NEOPROBE CORPORATION AND SUBSIDIARIES
                                        (A DEVELOPMENT STAGE COMPANY)
                                    CONSOLIDATED STATEMENTS OF CASH FLOWS
<CAPTION>
                                                                                               NOVEMBER 16,
                                                                 THREE MONTHS ENDED                1983
                                                                      MARCH 31,               (INCEPTION) TO
                                                                1997             1998         MARCH 31, 1998
                                                            -----------      -----------      --------------
<S>                                                         <C>              <C>              <C>           
Net cash used in operating activities                       $(7,297,045)     $(7,838,003)     $ (84,201,597)

Cash flows from investing activities:
  Purchases of available-for-sale securities                   (986,302)               0       (108,163,190)
  Proceeds from sales of available-for-sale securities          760,234        2,046,796         49,921,058
  Maturities of available-for-sale securities                 4,600,000        3,100,000         48,803,943
  Purchase of property and equipment                           (801,949)      (1,219,547)       (12,428,145)
  Other                                                         (28,661)         (15,599)        (1,052,631)
                                                            -----------      -----------      -------------

    Net cash provided by (used in) investing activities       3,543,322        3,911,650        (22,918,965)
                                                            -----------      -----------      -------------

Cash flows from financing activities:
  Proceeds from issuance of common stock, net                   626,355          114,343        102,650,033
  Proceeds from bank loan                                             0        2,345,594          4,159,031
  Other                                                         221,323         (107,159)         8,689,566
                                                            -----------      -----------      -------------

    Net cash provided by financing activities                   847,678        2,352,778        115,498,630
                                                            -----------      -----------      -------------

Effect of exchange rate changes on cash                          (7,836)          (2,966)           (33,584)
                                                            -----------      -----------      -------------

  Net decrease (increase) in cash and cash equivalents       (2,913,881)      (1,576,541)         8,344,484

Cash and cash equivalents at beginning of period             30,168,412        9,921,025                  0
                                                            -----------      -----------      -------------

  Cash and cash equivalents at end of period                $27,254,531      $ 8,344,484      $   8,344,484
                                                            ===========      ===========      =============
</TABLE>

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

                                       5
<PAGE>   6
                      NEOPROBE CORPORATION AND SUBSIDIARIES
                          (A DEVELOPMENT STAGE COMPANY)

                 NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

1.       BASIS OF PRESENTATION

         The information presented for March 31, 1997 and 1998, and for the
         periods then ended is unaudited, but includes all adjustments (which
         consist only of normal recurring adjustments) which the management of
         Neoprobe Corporation (the "Company") believes to be necessary for the
         fair presentation of results for the periods presented. Certain
         information and footnote disclosures normally included in financial
         statements prepared in accordance with generally accepted accounting
         principles have been condensed or omitted pursuant to the rules and
         regulations of the Securities and Exchange Commission. The results for
         the interim period are not necessarily indicative of results to be
         expected for the year. The financial statements should be read in
         conjunction with the Company's audited financial statements for the
         year ended December 31, 1997, which were included as part of the
         Company's Annual Report on Form 10-K. Certain 1997 amounts have been
         reclassified to conform with the 1998 presentation.

         In June 1997, the Financial Accounting Standards Board issued Statement
         of Financial Accounting Standards No.130 ("FAS 130") "Reporting
         Comprehensive Income." This Statement establishes standards for
         reporting and display of comprehensive income in a full set of general
         purpose financial statements. The Company adopted FAS 130 as of January
         1, 1998. Other comprehensive losses of the Company include the effects
         of translation gain or loss related to the Company's foreign operations
         and unrealized gains and losses on available-for-sale securities.

         The Company is a development stage enterprise engaged in the
         development and commercialization of technologies for the diagnosis and
         treatment of cancers. There can be no assurance that the Company will
         be able to commercialize its proposed products. There can also be no
         assurance that adequate financing will be available when needed or on
         terms attractive to the Company.

2.       INVENTORY

         The components of inventory are as follows:

                                                     DECEMBER 31,    MARCH 31,
                                                         1997          1998
                                                     ------------   ----------

                     Materials and component parts     $ 36,890     $   51,268
                     Work-in-process                    145,234        241,148
                     Finished goods                     230,900        896,766
                                                       --------     ----------
                                                       $413,024     $1,189,182
                                                       ========     ==========

3.       LONG-TERM DEBT

         Neoprobe (Israel) Ltd. ("Neoprobe (Israel)"), a subsidiary of the
         Company, is in the process of constructing a radiolabeling facility
         near Dimona, Israel, for use in future operations of the Company.
         Construction of the facility is being partially financed under an
         investment program approved by the state of Israel's Finance Committee
         (the "Committee"). Under the approved program, Neoprobe (Israel) is
         entitled to government grants and government loan guarantees equal to a
         percentage of the total loan taken for the construction and operation
         of the facility. Amounts received under the agreement are
         collateralized by certain property obtained through the use of proceeds
         received. As of March 31, 1998, Neoprobe (Israel) has received $4.2
         million and $1.0 million in the form of loans and grants, respectively.

                                       6
<PAGE>   7
4.       STOCK OPTIONS

         During the first quarter of 1998, the Board granted options to
         employees and certain directors of the Company under the 1996 Stock
         Incentive Plan (the "Plan") for 358,000 shares of common stock,
         exercisable at $5.63 per share, vesting over three to four years. The
         Company has 2.4 million options outstanding under two stock option
         plans. Of the outstanding options, 1.4 million options have vested as
         of March 31, 1998, at an average exercise price of $6.97 per share.

5.       CONTINGENCIES

         The Company is subject to legal proceedings and claims which arise in
         the ordinary course of its business. In the opinion of management, the
         amount of ultimate liability with respect to these actions will not
         materially affect the financial position of the Company.

6.       SUBSEQUENT EVENT

         In April 1998, the Company executed an agreement with Ethicon
         Endo-Surgery, Inc. ("EES"), a Johnson & Johnson company to market and
         promote the Neoprobe(R) 1500 Portable Radioisotope Detector and its
         14mm and 19mm reusable probes for gamma guided lymphatic mapping and
         minimally invasive surgery. During the initial one-year term of the
         agreement, EES will promote and sell the aforementioned products and
         train physicians in the use of Neoprobe's devices. EES will immediately
         begin marketing activities in the United States while the companies
         discuss expanding the agreement to cover other geographic areas. In
         exchange for promoting and selling the device products, EES will
         receive sales commissions based on sales of the aforementioned
         products.

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

This Management Discussion and Analysis of Financial Condition and Results of
Operations and other parts of this Report contain forward-looking statements
that involve risks and uncertainties. The Company's actual results in 1998 and
future periods may differ significantly from the prospects discussed in the
forward-looking statements. Factors that could cause or contribute to such
differences include, but are not limited to, government regulations, absence of
government approval for marketing the Company's products, limited revenues,
continuing net losses, accumulated deficit, uncertainty of capital funding for
future capital needs, dependence on patents, proprietary technology and trade
secrets, limited marketing experience, limited manufacturing capacity and
experience, dependence on principal product line, uncertainty of market
acceptance, no assurance of continued rights to targeting agents, royalty
payments, competition, limited third party reimbursement, risk of technological
obsolescence, possible volatility of stock price, anti-takeover provisions,
product liability, dependence on key personnel, ability to attract new
personnel, and ability to manage a changing business.

LIQUIDITY AND CAPITAL RESOURCES

Since inception, the Company has financed its operations primarily through
private and public offerings of its equity securities, from which it has raised
gross proceeds of approximately $120 million. As of March 31, 1998, the Company
had cash, cash equivalents, and available-for-sale securities of $17.9 million.
To date, the Company has devoted substantially all of its efforts and resources
to research and clinical development of innovative systems for the
intraoperative diagnosis and treatment of cancers. During the first quarter of
1998, the Company implemented a business plan to reduce operating expenses and
focus on three main business activities: commercializing the Company's first
RIGS(R) system (radioimmunoguided surgery) product, called RIGScan(R) CR49 (125I
- - CC49 monoclonal antibody) for the surgical detection of metastatic colorectal
cancer, increasing the Company's market position in gamma guided surgery
applications, and developing activated cellular therapy products for cancer and
viral diseases. During the first quarter of 1998, the Company cut its domestic
staff and reduced annual compensation expense by approximately $1 million
(approximately 20%) and postponed certain research projects which were expected
to be carried out in 1998.

                                       7
<PAGE>   8
The RIGS system integrates radiolabeled targeting agents and radiation detection
instruments. The Company is developing both the radiolabeled targeting agents
and radiation-detection instrument components of the RIGS technology. Prior to
1996, the Company completed testing in a Phase III clinical trial for the
detection of metastatic colorectal cancer. In addition, the Company has
completed testing in a separate Phase III clinical trial for the detection of
primary colorectal cancer. The Company must obtain regulatory approval to market
its products before commercial revenue can be generated. During 1996, the
Company submitted applications to the European regulatory agencies and to the
United States Food and Drug Administration ("FDA") to request permits to begin
marketing and selling the Company's RIGS products for the detection of
metastatic colorectal cancer. In November 1997, the Company withdrew its
application from the European Agency for the Evaluation of Medicinal Products
("EMEA") as a result of additional requests for information from the European
Committee for Proprietary Medicinal Products ("CPMP"). In addition, in December
1997, the FDA's Center for Biologics Evaluation and Research ("CBER") completed
its review of data submitted by the Company for its product and determined that
additional information must be provided before it can further consider the
approval of the Company's product.

In October 1997, the Company launched the Neoprobe(R) 1500 Portable Radioisotope
Detector in response to an emerging new surgical technique called lymphatic
mapping for treating patients with melanoma, a potentially deadly form of skin
cancer. Lymphatic mapping represents a less invasive surgical technique then
existing techniques for staging cancer or determining whether the cancer has
spread to the lymph nodes. Surgeons are using the lymphatic mapping technique
for treating patients with melanoma and investigating its use in patients with
breast cancer as well. The Company is currently selling the Neoprobe 1500
Portable Radioisotope Detector for the lymphatic mapping application and
expanding its line of instruments to provide a variety of gamma-detecting probes
for specialized uses. In March 1998, the Company introduced a smaller (14mm
diameter) detection probe whose performance has been optimized for use in
lymphatic mapping procedures. The Company recorded revenue of $864,000 during
the first quarter of 1998, predominantly related to sales of instruments used in
application of the lymphatic mapping technique.

The Company is also studying the safety and efficacy of certain therapy
products. In 1997, Neoprobe opened an IND application for clinical studies with
RIGS/ACT(TM) (RIGS technology based activated cellular therapy) for colorectal
cancer. One study is a Phase I/II multicenter trial using RIGS/ACT in patients
with recurrent, operable colorectal cancer. A second study is a Phase II
multicenter trial using RIGS/ACT with chemotherapy in patients with recurrent
but inoperable colorectal cancer. The Company has also funded a Phase I study to
determine the safety and feasibility of using ACT to help boost the immune
system of patients with HIV/AIDS. This study has completed enrollment. In
addition, the Company is funding a Phase I study to investigate the use of
activated cellular therapy with patients coinfected with HIV/AIDS and chronic
active hepatitis B or C.

For the period from inception to March 31, 1998, the Company has incurred
cumulative net losses of approximately $94.4 million. The Company does not
currently have a RIGS product approved for commercial sale in any major market
and does not anticipate commercial sales of sufficient volume to generate
positive cash flow until 2001, at the earliest. The Company has incurred, and
will continue to incur, substantial expenditures for research and development
activities related to bringing its products to the commercial market. The
Company intends to devote significant additional funds to clinical testing,
manufacturing validation, and other activities required for regulatory review
and commercialization of its products. The amount of funds and length of time
required to complete such testing will depend upon the outcome of regulatory
reviews. The regulatory bodies may require more testing than is anticipated by
the Company. There can be no assurance that the Company's RIGS products will be
approved for marketing by the FDA or any foreign government agency, or that any
such products will be successfully introduced or achieve market acceptance.

In April 1998, the Company executed a $3 million revolving line of credit
arrangement with a bank. Available borrowings under the line of credit are based
on a formula of eligible accounts receivable and inventory. Interest on the line
of credit is based on the prime rate or LIBOR, as elected by the Company. During
May 1998, the Company borrowed $700,000 under the line of credit.

                                       8
<PAGE>   9
Research and development expenses during the first quarter of 1998 were $5.2
million, or 66% of operating expenses for the period. Marketing and selling
expenses were $1.1 million, or 14% of operating expenses during the period and
general and administrative expenses were $1.6 million, or 20% of operating
expenses for the period. The Company anticipates that 1998 total operating
expenses will decrease over 1997 levels. The Company expects research and
development and general and administrative expenses to decrease from 1997.
However, the Company also expects marketing and selling expenses to increase
slightly from 1997 levels. The Company currently anticipates that approximately
$13.5 million in cash will be used to finance operating activities during 1998.

During 1998, the Company intends to file amendments to its BLA in order to
respond to the safety and product manufacturing questions raised in the CBER's
December 1997 letter. In addition, the Company continues to negotiate with the
FDA to determine how to obtain the additional clinical information necessary to
respond to its clinical questions. Furthermore, the Company intends to negotiate
with European regulatory authorities regarding the design of clinical trial(s)
to provide additional information to support submission of a new dossier. The
Company cannot assure if marketing approvals will be received without additional
substantial expenses or delays, or at all. However, if and when the Company
receives permission from the regulatory authorities to begin marketing its
products, additional costs for marketing and distribution will be incurred. The
Company has executed various agreements with third parties that supplement the
technical and business capabilities of the Company. The Company is generally
obligated to such parties to pay royalties or commissions upon commercial sale
of the related product. The Company's estimate of its allocation of cash
resources is based on the current state of its business operations, its current
business plan, and current industry and economic conditions, and is subject to
revisions due to a variety of factors including without limitation, additional
expenses related to marketing and distribution, regulatory licensing and
research and development, and to reallocation among categories and to new
categories. The Company may need to supplement its funding sources from time to
time.

Neoprobe Europe AB is a wholly-owned subsidiary of the Company, located in Lund,
Sweden, where it operates a biologics manufacturing and purification facility.
The Company uses the facility to prepare the CC49 monoclonal antibody produced
by Bio-Intermediair BV for final radiolabeling. The Company advanced funds to
Neoprobe Europe during the first quarter of 1998 to cover operating and capital
expenditures of approximately $416,000. The Company anticipates advancing an
additional $800,000 during the remainder of 1998 to cover operating and capital
expenditures.

In 1994, the Company formed Neoprobe (Israel) Ltd. ("Neoprobe (Israel)") to
construct and operate a radiolabeling facility near Dimona, Israel, for
radiolabeling of the Company's targeting agents. The Company owns 95 percent of
Neoprobe (Israel), with Rotem Industries Ltd. ("Rotem"), the private arm of the
Israeli atomic energy authority owning the balance and managing the facility.
Construction of the facility is being financed through a financial program
approved by the state of Israel's Finance Committee (the "Committee"). The total
amount of the approved program is $9.9 million. Neoprobe (Israel) is entitled to
receive grants based on a percentage of its investment and a government
guarantee of 75% to 85% of the principal balance of bank loans taken to build
and operate the facility. During the first quarter of 1998, the Company received
loan proceeds of approximately $2.4 million under the government sponsored
program. The Company expects to receive an additional $1.0 million in loan and
grant proceeds under the approved program during 1998. The Company does not
anticipate advancing any significant amount of funds to Neoprobe (Israel) during
1998.

At December 31, 1997, the Company had U.S. net operating tax loss carryforwards
of approximately $75.8 million to offset future taxable income through 2012.
Additionally, the Company has U.S. tax credit carryforwards of approximately
$2.2 million available to reduce future income tax liability through 2012. Under
Section 382 of the Internal Revenue Code of 1986, as amended, use of prior tax
loss carryforwards is limited after an ownership change. As a result of
ownership changes which occurred in March 1989 and in September 1994, the
Company's tax loss carryforwards and tax credit carryforwards are subject to the
limitations described by Section 382. The Company's international subsidiaries
also have net operating tax loss carryforwards in their respective foreign
jurisdictions.

The Company has performed a preliminary assessment of the year 2000 issue as it
relates to the Company's information systems and vendor supplied application
software. Based on these assessments, management does not anticipate any
significant impact on the Company as a result of implications associated with
that issue.

                                       9
<PAGE>   10
RESULTS OF OPERATIONS

Since inception, the Company has dedicated substantially all of its resources to
research and development of its RIGS system for the intraoperative diagnosis and
treatment of cancer. Until the appropriate regulatory approvals are received,
the Company is limited in its ability to generate revenue. During the first
quarter of 1998, the Company generated sales of Neoprobe 1500 systems of
$864,000. Results of operations for the first quarter of 1998 include
approximately $800,000 in reorganization costs associated with the adoption of
the Company's new business plan.

Three Months ended March 31, 1998, and 1997.

Revenue and Other Income

The Company had net sales of approximately $864,000 during the first quarter of
1998, compared to $1.1 million during the same period in 1997. Net sales in 1998
were composed almost entirely of instrument sales. In March 1998, the Company
introduced a smaller (14mm diameter) detection probe whose performance has been
optimized for use in lymphatic mapping procedures. In 1997, net sales included
instrument sales of $1.0 million and blood serology products of $100,000.
Instrument sales in 1997 reflect the impact of the Company's marketing
arrangement with the United States Surgical Corporation which was terminated in
October 1997. Sales of serology products at Neoprobe Europe continued to
decrease as a result of the Company's efforts to develop the long-term
production capacity for targeting agents. Other income during the first quarter
of 1998 and 1997 was $224,000 and $584,000, respectively, and represented
primarily interest income earned during both periods.

Research and Development Expenses

Research and development expenses increased during the first quarter of 1998 to
$5.2 million from $3.5 million for the same period in 1997. The increase
reflects the Company's efforts to develop and produce the Company's next
generation of devices for the gamma guided surgery business. The increase also
reflects severance and other costs incurred during the first quarter associated
with the Company's reorganization in February. Clinical trial activity decreased
during the first quarter of 1998, compared to the same period in 1997, and was
primarily related to the development of activated cellular therapy technology.

Marketing and Selling Expenses

During the first quarter of 1998, marketing and selling expenses increased by
$239,000 over the same period in 1997. The increase in marketing expenses during
the first quarter of 1998, as compared to the same period in 1997, relates to an
increased marketing effort to meet competitive pressure and further penetrate
the lymphatic mapping market as well as to continue to support the anticipated
launch of the Company's first RIGS(R) product. The increased expenses were the
result of a greater number of sales and marketing personnel in 1998, coupled
with relative increases in travel and entertainment as well as promotional costs
associated with the launch of new products.

General and Administrative Expenses

General and administrative expenses were $1.6 million for both the first quarter
of 1998 and the same period in 1997. Additional costs related to the February
reorganization were offset by an overall lower headcount during the first
quarter of 1998 than the same period in 1997.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not applicable.

                                       10
<PAGE>   11
                           PART II - OTHER INFORMATION

ITEM 1.       LEGAL PROCEEDINGS.

              None.


ITEM 2.       CHANGES IN SECURITIES AND USE OF PROCEEDS.

              None.


ITEM 3.       DEFAULTS UPON SENIOR SECURITIES.

              None.


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

              None.


ITEM 5.       OTHER INFORMATION.

              None.


ITEM 6.       EXHIBITS AND REPORTS ON FORM 8-K.

         A.   LIST OF EXHIBITS


              3.     ARTICLES OF INCORPORATION AND BY-LAWS

              Exhibit 3.1

              Complete Restated Certificate of Incorporation of Neoprobe
              Corporation, as corrected February 18, 1994, and as amended June
              27, 1994, July 25, 1995, and June 3, 1996 (incorporated by
              reference to Exhibit 99.2 to the Registrant's Current Report on
              Form 8-K dated June 20, 1996; Commission File No. 0-26520).

              Exhibit 3.2

              Amended and Restated By-Laws dated July 21, 1993, as amended July
              18, 1995, and May 30, 1996 (incorporated by reference to Exhibit
              99.4 to the June 1996 Form 8-K).


              4.     INSTRUMENTS DEFINING THE RIGHTS OF HOLDERS, INCLUDING
                     INDENTURES

              Exhibit 4.1

              See Articles FOUR, FIVE, SIX and SEVEN of the Restated Certificate
              of Incorporation of the Registrant (see Exhibit 3.1).

                                       11
<PAGE>   12
              Exhibit 4.2

              See Articles II and VI and Section 2 of Article III and Section 4
              of Article VII of the Amended and Restated By-Laws of the
              Registrant (see Exhibit 3.2).

              Exhibit 4.3

              Rights Agreement dated as of July 18, 1995 between the Registrant
              and Continental Stock Transfer & Trust Company (incorporated by
              reference to Exhibit 1 of the registration statement on Form 8-A;
              Commission File No. 0-26520).


              EXHIBIT 10.     MATERIAL CONTRACTS.

              Exhibit 10.2.42

              Severance Agreement dated October 9, 1997 between the Registrant
              and Larry Anderson.

              Exhibit 10.2.43

              Agreement, Release, and Waiver dated February 23, 1998 between the
              Registrant and Dr. William Eisenhardt.


              11.    STATEMENT REGARDING COMPUTATION OF PER SHARE EARNINGS.

              Exhibit 11.1

              Computation of Net Loss Per Share (basic and diluted).


              27.    FINANCIAL DATA SCHEDULE.

              Exhibit 27.1

              Financial Data Schedule (submitted electronically for SEC
              information only).

         B.   REPORTS ON FORM 8-K.

              No current report on Form 8-K was filed by the Registrant during
              the first quarter of fiscal 1998.

                                       12
<PAGE>   13
                                   SIGNATURES

In accordance with the requirements of the Exchange Act, the Registrant caused
this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

                                      NEOPROBE CORPORATION
                                      (Registrant)

                                      By: /s/ David C. Bupp
                                      -------------------------------------
                                      President and Chief Executive Officer
                                      (principal executive officer)
Dated: May 14, 1998



                                      By: /s/ John Schroepfer
                                      -------------------------------------
                                      John Schroepfer, Vice President
                                      Finance & Administration
                                      (principal financial and accounting
                                      officer)

                                       13
<PAGE>   14
- --------------------------------------------------------------------------------




                       SECURITIES AND EXCHANGE COMMISSION

                              WASHINGTON, DC 20549


                            ------------------------


                              NEOPROBE CORPORATION


                            ------------------------


                           FORM 10-Q QUARTERLY REPORT

                             FOR THE QUARTER ENDED:

                                 MARCH 31, 1998


                             -----------------------


                                    EXHIBITS


                            -------------------------




- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
<PAGE>   15
                                  EXHIBIT INDEX


Exhibit 3.1

Complete Restated Certificate of Incorporation of Neoprobe Corporation, as
corrected February 18, 1994, and as amended June 27, 1994, July 25, 1995, and
June 3, 1996 (incorporated by reference to Exhibit 99.2 to the Registrant's
Current Report on Form 8-K dated June 20, 1996; Commission File No. 0-26520).


Exhibit 3.2

Amended and Restated By-Laws dated July 21, 1993, as amended July 18, 1995, and
May 30, 1996 (incorporated by reference to Exhibit 99.4 to the June 1996 8-K).


Exhibit 4.1

See Articles FOUR, FIVE, SIX and SEVEN of the Restated Certificate of
Incorporation of the Registrant (see Exhibit 3.1).


Exhibit 4.2

See Articles II and VI and Section 2 of Article III and Section 4 of Article VII
of the Amended and Restated By-Laws of the Registrant (see Exhibit 3.2).


Exhibit 4.3

Rights Agreement dated as of July 18, 1995 between the Registrant and
Continental Stock Transfer & Trust Company (incorporated by reference to Exhibit
1 of the registration statement on Form 8-A; Commission File No.
0-26520).

Exhibit 10.2.42

Severance Agreement dated October 9, 1997 between the Registrant and Larry
Anderson.

Page 16 in the manually signed original.

Exhibit 10.2.43

Agreement, Release, and Waiver dated February 23, 1998 between the Registrant
and Dr. William Eisenhardt.

Page 22 in the manually signed original.

Exhibit 11.1

Computation of Net Loss Per Share.

Page 29 in the manually signed original.


Exhibit 27.1

Financial Data Schedule (submitted electronically for SEC information only).

<PAGE>   1
                                                                 Exhibit 10.2.42


                               SEVERANCE AGREEMENT
                               -------------------


         THIS AGREEMENT, effective on the last date executed below, is entered
into between NEOPROBE CORPORATION, 425 Metro Place North, Dublin, Ohio, on
behalf of itself, its officers, directors, shareholders, employees and agents
(in their individual and representative capacities), and its parent, affiliated,
predecessor, successor, subsidiary and other related companies, and each of
them, jointly and severally (herein singularly and collectively called the
"Company"), and LARRY E. ANDERSON, 4957 Chaddington Drive, Dublin, Ohio, on
behalf of himself and his heirs, executors, guardians, administrators,
successors and assigns, and each of them, jointly and severally (herein
singularly and collectively called "Anderson"), who agree to be bound by all of
the terms and conditions hereof.

         WHEREAS, the Parties desire to fully and completely settle and dispose
of any and all claims of whatever kind or nature which Anderson ever had, may
now have or may hereafter have against the Company, whether known or unknown,
the Parties hereto agree as follows:

          1. The Company agrees to pay Anderson the sum of Forty-One Thousand
Two Hundred Fifty Dollars ($41,250.00), which represents any and all backpay,
severance pay, front pay, wages, vacation pay, benefits, attorneys' fees, costs,
interest, damages (whether compensatory, exemplary, punitive or otherwise) and
other monies to which Anderson may now or may hereafter be entitled from the
Company, except as otherwise specifically set forth in Paragraphs 2 through 5 of
this Agreement. The amount being paid hereunder shall be subject to deduction
for the applicable federal, state and local social security, wage, withholding
and similar taxes. The amount being paid hereunder shall be paid in six (6)
semi-monthly installments, of Six Thousand Eight Hundred Seventy-Five Dollars
($6,875.00) each, in accordance with the Company's regular payroll practices,
commencing on or after the tenth (10th) day following Anderson's execution of
this Agreement.

           2. Anderson acknowledges receipt of notice of his right to elect
continued health care coverage in accordance with the provisions of the federal
Consolidated Omnibus Budget & Reconciliation Act, as amended ("COBRA"). In the
event that Anderson exercises his COBRA right to continue coverage under the
Company's group health insurance policy, the Company agrees to pay the premiums
for such coverage through December 31, 1997. Thereafter, if Anderson wishes to
continue such coverage for the remainder of the fifteen (15) month COBRA period,
he must do so at his own expense.

         3. The Company agrees that Anderson shall receive all monies to which
he is entitled under the Neoprobe, Inc. 401(k) Plan in accordance with the terms
thereof.

         4. Anderson's coverage under the Company's disability, travel and life
insurance plans shall terminate as of October 10, 1997, and he may have the
right to convert such coverage to his own individual plan if provided for under,
and in accordance with, the terms of, such plans.
<PAGE>   2
         5. The Company agrees not to contest any claim for unemployment
benefits which Anderson might file as a result of his separation from the
Company on October 10, 1997. However, the Company expressly waives any
commitment that it is warranting or guaranteeing Anderson's receipt of such
unemployment benefits inasmuch as that determination is solely within the
province of the Ohio Bureau of Employment Services.

         6. Anderson waives any and all rights to reinstatement or to future
employment with the Company, which he ever had, may now have or may hereafter
have, whether known or unknown to Anderson at the time of execution of this
Agreement. Anderson further agrees not to apply for employment or reemployment
with the Company.

         7. Anderson waives any and all rights to participation in any Company
benefit plan which he ever had, may now have or may hereafter have, whether
known or unknown to Anderson at the time of execution of this Agreement, with
the exception of those benefits provided in Paragraphs 2 through 5 of this
Agreement.

         8. Anderson agrees not to file any charges, claims, suits, complaints
or grievances against the Company with any federal, state or local governmental
agency, or in any court of law, with respect to any aspect of his employment by,
or separation of employment from, the Company, or with respect to any other
matter whatsoever, whether known or unknown to Anderson at the time of execution
of this Agreement, with the exception of any claim that the Company breached its
commitments under Paragraphs 1 through 5 of this Agreement.

         9. Anderson acquits, releases and forever discharges the Company of and
from all, and in all manner of, actions and causes of action, suits, debts,
claims and demands whatsoever, in law or in equity, which he ever had, may now
have or may hereafter have with respect to any aspect of his employment by, or
separation of employment from, the Company, or with respect to any other matter
whatsoever, whether known or unknown to Anderson at the time of execution of
this Agreement, with the exception of any claim that the Company breached its
commitments under Paragraphs 1 through 5 of this Agreement.

         10. Anderson's covenants and releases, as set forth in this Agreement,
include a waiver of any and all rights or remedies which he ever had, may now
have or may hereafter have against the Company in tort or in contract, or under
any present or future federal, state or local statute or law, including, but not
limited to, Ohio's Laws Against Discrimination, O.R.C. Chapter 4112; Title VII
of the 1964 Civil Rights Act, 42 U.S.C. Section 2000e, et seq.; the 1866 Civil
Rights Act, 42 U.S.C. Section 1981; the Civil Rights Act of 1991, PL. 102-166;
the 1967 Age Discrimination in Employment Act, 29 U.S.C. Section 621, et seq.;
the Americans with Disabilities Act, 42 U.S.C. Section 12101, et seq.; the Fair
Labor Standards Act of 1938, 29 U.S.C. Section 201, et seq.; the Equal Pay Act,
29 U.S.C. Section 206(d); the Family and Medical Leave Act of 1993, 29 U.S.C.
Section 2601, et seq.; the Occupational Safety and Health Act of 1970, 29 U.S.C.
Section 553, et seq.; the Employee Retirement Income Security Act of 1974, 29
U.S.C. Section 1001, et seq.; the Consolidated Omnibus Budget Reconciliation Act
of 1986, 29 U.S.C. Section 1161, et seq.; Ohio's Workers' Compensation Law; and
any statutory amendments.
<PAGE>   3
         11. Anderson intends that this Agreement shall bar each and every
claim, demand and cause of action hereinabove specified, whether known or
unknown to him at the time of execution of this Agreement. As a result, Anderson
acknowledges that he might, in the future, discover claims or facts in addition
to or different from those which he now knows or believes to exist with respect
to the subject matters of this Agreement and which, if known or suspected at the
time of executing this Agreement, may have materially affected this settlement.
Nevertheless, Anderson hereby waives any right, claim, or cause of action that
might arise as a result of such different or additional claims or facts.

         12. By entering into this Agreement, the Company does not admit to the
breach of any contractual or other promises to Anderson, and does not admit to
the violation of any federal, state, local or other statute or law, including,
but not limited to, those laws referred to in Paragraph 10 of this Agreement,
and any claimed breaches or violations are hereby specifically denied.

         13. Anderson agrees that, immediately upon execution of this Agreement
by all Parties hereto, he will return to the Company all Company credit cards,
keys, customer lists and records, policy and procedure manuals, price lists,
business contracts and other documents and information belonging to the Company.

         14. Anderson recognizes that the Company possesses certain business and
financial information about its operations, information about new or envisioned
products or services, manufacturing methods, product research, product
specifications, records, plans, prices, costs, customer lists, concepts and
ideas, and is the owner of proprietary rights in certain systems, methods,
processes, procedures, technical and non-technical information, inventions,
machinery, research and other things which constitute valuable trade secrets of
the Company. Anderson acknowledges that he has been employed in positions in
which he has had access to such information and that the Company has a
legitimate interest in protecting such confidential and proprietary information
in order to maintain and enhance a competitive edge within its industry.
Accordingly, Anderson agrees that he will not use or remove, duplicate or
disclose, directly or indirectly, to any persons or entities outside the Company
any information, property, trade secrets or other things of value which have not
been publicly disclosed. In the event that Anderson is requested or required in
a judicial, administrative or governmental proceeding to disclose any
information that is the subject matter of this Paragraph 14, he will provide the
Company with prompt written notice of such request and all related proceedings
so that the Company may seek an appropriate protective order or remedy or, as
soon as practicable, waive Anderson's compliance with the provisions of this
Paragraph 14. Anderson recognizes that the remedy at law for any breach by him
of this Paragraph 14 will be inadequate and that the damages flowing from such
breach are not readily susceptible to being measured in monetary terms.
Accordingly, upon proof of Anderson's violation of any legally enforceable
provision of this Paragraph 14, the Company shall be entitled to immediate
injunctive relief and may obtain a temporary order restraining any threatened or
further breach. Nothing in this Agreement shall be deemed to limit the remedies
at law or in equity

                                       3
<PAGE>   4
available to the Company for any breach by Anderson of this Paragraph 14.
Anderson has carefully considered the nature and extent of the restrictions upon
him and the rights and remedies conferred upon the Company under this Paragraph
14, and hereby agrees that the same are reasonably designed to eliminate
competition which otherwise would be unfair to the Company, do not stifle the
inherent skill and experience of Anderson, would not operate as a bar to his
sole means of support, are fully required to protect the legitimate interests of
the Company and do not confer a benefit upon the Company disproportionate to the
detriment to Anderson.

         15. Anderson agrees that he will not, directly or indirectly, and
without the Company's prior written consent, voluntarily provide information,
documents or testimony to any governmental agency, entity or person (except his
counsel and immediate family) regarding: (a) Anderson's employment with, or
termination of employment from, the Company (except in connection with
Anderson's application for employment with another employer, or his application
for any insurance, retirement, disability or unemployment benefits); (b) any
other person's employment with, or termination of employment from, the Company;
or (c) any information or documents concerning the Company. In the event that a
subpoena or other lawful process is properly served upon Anderson requiring
production or disclosure of information or documents concerning the foregoing
matters, Anderson shall promptly notify the Company's human resources
department, in writing, and provide it with copies of any subpoena or other
process served upon him. Anderson shall thereafter make such documents available
to the Company for inspection and copying at a reasonable time and place
designated by the Company prior to their production. In the event that the
subpoena or other process requires testimony or statements from Anderson,
Anderson agrees to meet, telephonically or in person, with attorneys or agents
designated by the Company, at a time and place designated by the Company and
prior to the testimony, for the purpose of discussing such testimony. Nothing
herein shall give the Company the right to control or dictate the content of any
testimony given by Anderson, or any documents produced by him, pursuant to
subpoena or other lawful process. It is understood that Anderson shall provide
all information lawfully required of him. In the event that the Company requires
any information or testimony from Anderson in connection with any claim made
against the Company, or any claims made by the Company against persons or
entities not party to this Agreement, Anderson agrees to cooperate fully with
the Company, including: (a) appearing at any trial, hearing, deposition or
arbitration; (b) meeting telephonically or in person with attorneys or agents
designated by the Company, at a time and place designated by the Company and
prior to the testimony, for the purpose of discussing such testimony and any
other matters relating to the claim; and (c) providing the Company with any
documentation in Anderson's custody or control. The Company agrees to pay
Anderson for any reasonable travel, telephone, photocopy and other out-of-pocket
expenses incurred as a result of any requests made of him by the Company under
this Paragraph 15. The provisions of this Paragraph 15 shall not apply to any
action brought under this Agreement.

         16. Anderson agrees that no later than October 30, 1997, he shall meet
with a

                                       4
<PAGE>   5
representative of the Company's human resources department for the purpose of
making an accounting of all business expenses related to his employment with the
Company, in accordance with the Company's expense reimbursement policy and
practices, for which Anderson claims reimbursement from the Company. In the
event that Anderson has incurred such expenses for which he was not already
reimbursed by the Company, the Company shall reimburse Anderson for the same. If
the amount of any travel advances or reimbursements made to Anderson by the
Company exceeds the amount of his business expenses (as herein defined), the
difference shall be deducted by the Company from amounts owing to Anderson under
Paragraph 1 of this Agreement. As part of such accounting, Anderson shall also
provide the Company with proof, by way of copies of cancelled checks, that he
has paid all of his bills on his Corporate American Express Card. If any bills
have not been paid in full, the amount owing to American Express shall be
deducted by the Company from amounts owing to Anderson under Paragraph 1 of this
Agreement and the Company shall thereafter be responsible for paying such
amounts owed to American Express.

         17. Anderson agrees that he will not reveal the existence of this
Agreement, nor any terms thereof, to any person, entity, or organization, except
to his immediate family, to his attorney, or as may be required by law.

         18. In the event that Anderson, or any person, entity or organization,
breaches any of his promises made in this Agreement, and the Company defends or
pursues any charge, suit, complaint, claim or grievance as a result thereof,
Anderson shall be liable to the Company for all damages, attorneys' fees,
expenses and costs (including discovery costs) incurred by it in defending or
pursuing the same.

         19. The Parties agree that this Agreement shall be construed in
accordance with Ohio law, and that any action brought by any party hereunder may
be instituted and maintained only in the appropriate court having jurisdiction
over Franklin County, Ohio.

         20. Anderson acknowledges that he has been advised of his right to have
at least twenty-one (21) days within which to review and consider this
Agreement, and has been advised of his right to consult with legal counsel with
respect thereto. Anderson further acknowledges that he has entered into this
Agreement voluntarily and of his own free will. Anderson acknowledges his right
to revoke this Agreement within seven (7) days following his execution hereof,
by giving written notice thereof to the Company. In the event of such
revocation, this Agreement shall become null and void, and no party hereto shall
have any rights or obligations hereunder.

         21. The Parties agree that the foregoing constitutes the entire
agreement among them, and that there exist no other agreements, oral or written,
express or implied, relating to any matters covered by this Agreement, or
relating to any other matter whatsoever, whether or not within the knowledge or
contemplation of either of the Parties at the time of execution of this
Agreement. This Agreement may only be changed in writing signed by both Parties
hereto.

                                       5
<PAGE>   6
         WHEREFORE, the Parties have read all of the foregoing, understand the
same, and agree to all of the provisions contained herein.


NEOPROBE CORPORATION                         LARRY ANDERSON

By:  /s/ David Bupp                          By:  /s/ Larry Anderson
    -------------------------------              -------------------------------
    David Bupp, President                        Larry Anderson

Dated:  October 9, 1997                      Dated:  October 9, 1997
       ----------------------------                 ----------------------------

                                       6

<PAGE>   1
                                                                 Exhibit 10.2.43


                          AGREEMENT, RELEASE AND WAIVER
                          -----------------------------


NOTICE:  YOU ARE ADVISED TO CONSULT WITH AN ATTORNEY PRIOR TO EXECUTING THIS
         AGREEMENT.

         This Agreement, Release and Waiver (the "Agreement") is a contract
between the undersigned employee ("you") who is being involuntarily separated
from employment on February 16, 1998 and your employer, Neoprobe Corporation
("Neoprobe").

1.       BENEFITS. In consideration for signing this Agreement, Release and
         Waiver, you will receive the following benefits (the "Severance
         Benefits").

         A.       Neoprobe agrees to pay you your regular salary, in the gross
                  amount of Three Thousand Six Hundred Forty-Five Dollars and
                  Eighty-Three Cents ($3,645) per week, for a period of
                  twenty-four (24) weeks, in accordance with Neoprobe's regular
                  payroll practices. Such payments shall commence on the first
                  pay day after seven (7) days have elapsed following your
                  execution of this Agreement.

         B.       Neoprobe agrees to pay you the gross amount of Fourteen
                  Thousand Five Hundred Eighty Three Dollars ($14,583.00), which
                  represents all accrued but unused vacation pay owed to you.
                  Such payment shall be made in a lump sum on the first pay day
                  after seven (7) days have elapsed following your execution of
                  this Agreement.

         C.       Neoprobe agrees to engage Drake, Beam, Morin ("DBM") to
                  provide outplacement services to you to assist you in securing
                  other employment. However, Neoprobe's obligation hereunder
                  shall be limited to the payment of DBM's fees for such
                  services, as agreed upon between Neoprobe and DBM. Neoprobe
                  shall not be considered as a guarantor nor as warranting the
                  results of the services provided, and you agree to hold
                  Neoprobe harmless from, and waive any claims against Neoprobe,
                  in connection with the services provided to you by DBM.

2.       COBRA. You acknowledge receipt of notice of your right to elect
         continued health care coverage in accordance with the provisions of the
         federal Consolidated Omnibus Budget & Reconciliation Act, as amended.
         amended ("COBRA"). In the event that you exercise your COBRA right to
         continue coverage under Neoprobe's group health insurance policy,
         Neoprobe agrees to pay the premiums for such coverage through August
         31, 1998. Thereafter, if you wish to continue such coverage for the
         remainder of the twelve (12) month COBRA period, you must do so at your
         own expense.

3.       401(K) PLAN. You shall receive all monies to which you are entitled
         under Neoprobe's 401(k) Plan in accordance with the terms thereof.
<PAGE>   2
4.       UNEMPLOYMENT BENEFITS. Neoprobe agrees not to contest any claim for
         unemployment benefits which you might file as a result of your
         separation from Neoprobe on February 16, 1998. However, Neoprobe
         expressly waives any commitment that it is warranting or guaranteeing
         your receipt of such unemployment benefits inasmuch as that
         determination is solely within the province of the Ohio Bureau of
         Employment Services.

5.       LETTER OF REFERENCE. Neoprobe agrees to provide you with a letter of
         reference in the form of the draft letter attached hereto as Exhibit A.

6.       STOCK OPTIONS. Neoprobe agrees that you shall be eligible to exercise
         any stock options to which you may be entitled under the Neoprobe Stock
         Purchase Plan in accordance with the terms thereof.

7.       INSURANCE. Your coverage under Neoprobe's disability insurance plan
         shall terminate as of February 17, 1998, and you may have the right to
         convert such coverage to your own individual plan if provided for
         under, and in accordance with, the terms of, such plan. Your coverage
         under Neoprobe's life insurance plan shall continue for the period set
         forth in Section 1(A) hereinabove, and you may have the right to
         convert such coverage to your own individual plan if provided for
         under, and in accordance with, the terms of, such plan.

8.       WAIVER OF RIGHT TO NEOPROBE BENEFITS. You waive any and all rights to
         participation in any Neoprobe benefit plan which you ever had, may now
         have or may hereafter have, whether known or unknown to you at the time
         of execution of this Agreement, with the exception of those benefits
         provided in this Agreement.

9.       RELEASE. In consideration for the Severance Benefits specified in
         Section 1 above, you hereby release and discharge Neoprobe Corporation,
         its subsidiaries, affiliates, successors and assigns and their
         respective directors, officers, employees and agents (hereinafter
         collectively referred to as "Releasees"), both individually and in
         their official capacity, from all claims, actions and causes of action
         of any kind, which you, or your agents, executors, heirs, or assigns
         ever had, now have, or may have, whether known or unknown, as a result
         of your employment by or termination of employment from Neoprobe. This
         release includes, but is not limited to, the following: any action or
         cause of action asserted or which could have been asserted under Ohio's
         Laws Against Discrimination, O.R.C. Chapter 4112; Title VII of the 1964
         Civil Rights Act, 42 U.S.C. Section 2000e, et seq.; the 1866 Civil
         Rights Act, 42 U.S.C. Section 1981; the Civil Rights Act of 1991, PL.
         102-166; the 1967 Age Discrimination in Employment Act, 29 U.S.C.
         Section 621, et seq.; the Americans with Disabilities Act, 42 U.S.C.
         Section 12101, et seq.; the Fair Labor Standards Act of 1938, 29 U.S.C.
         Section 201, et seq.; the Equal Pay Act, 29 U.S.C. Section 206(d); the
         Family and Medical Leave Act of 1993, 29 U.S.C. Section 2601, et seq.;
         the Occupational Safety and Health Act of 1970, 29 U.S.C. Section 553,
         et seq.; the Employee Retirement Income Security Act of 1974, 29 U.S.C.
         Section 1001, et seq.; the Consolidated Omnibus Budget Reconciliation
         Act of 1986, 29 U.S.C. Section 1161, et seq.; Ohio's Workers'
         Compensation
<PAGE>   3
                                      -3-

         Law; any claims for wrongful discharge, unjust dismissal, or
         constructive discharge; any claims for breach of any alleged oral,
         written or implied contract of employment; any claims for emotional
         distress or other torts; any claims for salary, severance payments,
         bonuses or other compensation of any kind; any claims for benefits;
         claims for libel, slander defamation and attorneys' fees; and any other
         claims under federal, state, or local statute, law, rule or regulation.

         BY SIGNING THIS AGREEMENT, YOU GIVE UP ANY RIGHT YOU MAY HAVE TO BRING
         A LAWSUIT OR RECEIVE A RECOVERY ON ANY CLAIM AGAINST NEOPROBE AND THOSE
         ASSOCIATED WITH NEOPROBE BASED ON ANY ACTIONS, FAILURES TO ACT,
         STATEMENTS, OR EVENTS OCCURRING PRIOR TO THE DATE OF THIS AGREEMENT,
         INCLUDING CLAIMS THAT IN ANY WAY ARISE FROM OR RELATE TO YOUR
         EMPLOYMENT WITH NEOPROBE OR THE TERMINATION OF THAT EMPLOYMENT, WITH
         THE EXCEPTION OF ANY CLAIM THAT NEOPROBE BREACHED ITS COMMITMENTS UNDER
         THIS AGREEMENT.

10.      FUTURE RELATIONSHIP WITH NEOPROBE. In further consideration of the
         Severance Benefits, you agree to waive reinstatement of employment
         and/or future employment with Neoprobe, and agree not to apply for,
         solicit, seek or otherwise attempt to obtain employment with Neoprobe
         without first obtaining written authorization from the office of
         Neoprobe's Director, Human Resources. You further agree that should any
         such employment application be made by you to Neoprobe without first
         obtaining such written authorization, Neoprobe shall have no obligation
         to process that application or to hire you, and the failure to process
         that application or to hire you shall not constitute a violation any
         state, federal or local law, order, regulation or common law doctrine.

11.      NO FUTURE LAWSUITS. In addition to all other obligations you may have
         under the terms of this Agreement, you also separately and
         independently covenant and agree that you will not sue Releasees upon
         any of the claims that you have released in Section 9 of this
         Agreement, and/or upon a claim arising out of any employment
         application which you may make in violation of Section 10 of this
         Agreement. You further agree not to assist any other person or entity
         in bringing any lawsuit against Neoprobe in any state or federal court
         unless such restriction is prohibited by law.

12.      NOTICE FOR IMPACTED EMPLOYEES. You acknowledge that on or prior to
         February 16, 1998, you received from Neoprobe a list of (a) the job
         titles and ages of employees from Neoprobe who were selected
         involuntarily for separation from Neoprobe on February 16, 1998; and
         (b) the job titles and ages of employees who were not selected for
         separation (hereafter such list shall collectively be referred to as
         the "Notice for Impacted Employees").

13.      CONFIDENTIALITY OF NOTICE. You agree that the contents of the Notice
         for Impacted
<PAGE>   4
                                      -4-

         Employees shall be kept confidential and shall not be disclosed to any
         person or entity, except to your attorney, legal advisor or spouse or
         except as required by law.

14.      COOPERATION. You understand that following your termination of
         employment, Neoprobe may need your continued cooperation and
         involvement with various pieces of litigation and other legal matters
         which are pending at such time or which may arise thereafter. In
         further consideration of Severance Benefits, you agree at Neoprobe's
         request from time to time, to cooperate with Neoprobe in its efforts to
         defend and/or pursue any such litigation or other legal matters. You
         will provide this assistance to Neoprobe at no additional remuneration
         beyond the Severance Benefits. When performing these services at
         Neoprobe's request, except where prohibited by law, Neoprobe will
         reimburse you for reasonable travel, lodging and lost income that you
         incur upon submission of documented expenses acceptable to Neoprobe. By
         way of illustration and not by way of limitation, the types of services
         that may be requested of you under this Section 14 include: attending
         strategy sessions, attending preparations for trial, appearing at
         depositions, executing affidavits and testifying at trials.

15.      RETURN OF NEOPROBE PROPERTY. Whether or not you sign this Agreement,
         you, as a terminating employee, are reminded that you must return to
         Neoprobe, (i) all Neoprobe documents, and other tangible items, and any
         copies, that are in your possession or control and which contain
         confidential information in written, magnetic or other form and shall
         have not given such documents, items, or copies to anyone other than
         another Neoprobe employee; and (ii) all other Neoprobe property within
         your possession including, but not limited to, office keys,
         identification badges or passes, Neoprobe credit cards, and computer
         equipment and software.

 16.     NEOPROBE EMPLOYEES' AGREEMENT. Whether or not you sign this Agreement,
         you, as a terminating employee, are reminded that the Neoprobe
         Employees' Agreement (the "Employee's Agreement") entered into between
         Neoprobe and yourself remains in full force and effect after
         termination of your employment. Under the Employees' Agreement, you
         have a continuing obligation to maintain the confidentiality of all
         confidential, proprietary and trade secret information which you
         obtained during your employment with Neoprobe.

17.      DUTY OF CONFIDENTIALITY. You recognize that Neoprobe possesses certain
         business and financial information about its operations, information
         about new or envisioned products or services, manufacturing methods,
         product research, product specifications, records, plans, prices,
         costs, customer lists, concepts and ideas, and is the owner of
         proprietary rights in certain systems, methods, processes, procedures,
         technical and non-technical information, inventions, machinery,
         research and other things which constitute valuable trade secrets of
         Neoprobe. You acknowledge that you have been employed in positions in
         which you have had access to such information and that Neoprobe has a
         legitimate interest in protecting such confidential and proprietary
         information in order to maintain
<PAGE>   5
                                      -5-

         and enhance a competitive edge within its industry. Accordingly, you
         agree that you will not use or remove, duplicate or disclose, directly
         or indirectly, to any persons or entities outside Neoprobe any
         information, property, trade secrets or other things of value which
         have not been publicly disclosed. In the event that you are requested
         or required in a judicial, administrative or governmental proceeding to
         disclose any information that is the subject matter of this Section 17,
         you will provide Neoprobe with prompt written notice of such request
         and all related proceedings so that Neoprobe may seek an appropriate
         protective order or remedy or, as soon as practicable, waive your
         compliance with the provisions of this Section 17. You acknowledge that
         you have carefully considered the nature and extent of the restrictions
         upon you and the rights and remedied conferred under Neoprobe under
         this Section 17 and hereby agree that the same are reasonably designed
         to eliminate competition which otherwise would be unfair to Neoprobe,
         do not stifle the inherent skill and experience of you, would not
         operate as a bar to your sole means of support, are fully required to
         protect the legitimate interests of Neoprobe and do not confer a
         benefit upon Neoprobe disproportionate to the detriment of you.

18.      BREACH. You agree that if you violate any part of this Agreement or
         your Employees' Agreement, you will not be entitled to the Severance
         Benefits described in Section 1. You further agree that any breach or
         threatened breach by you of this Agreement cannot be remedied solely by
         the recovery of damages and Neoprobe shall therefore be entitled to an
         injunction against such breach or threatened breach without posting any
         bond or other security. Nothing herein, however, shall be construed as
         prohibiting Neoprobe from pursuing all its available rights, in law or
         equity for such breach or threatened breach, including the recovery of
         damages. In the event that you breach any of the promises made in this
         Agreement, and Neoprobe defends or pursues any charge, suit, complaint,
         claim or grievance as a result thereof, you shall be liable to Neoprobe
         for all damages, attorneys' fees, expenses and costs (including
         discovery costs) incurred by Neoprobe in defending or pursuing the
         same.

19.      DISCLOSURE OF NEOPROBE INFORMATION PURSUANT TO LEGAL PROCESS. You agree
         that you will not, directly or indirectly, and without Neoprobe's prior
         written consent, voluntarily provide information, documents or
         testimony to any governmental agency, entity or person (except to your
         legal counsel and immediate family) regarding: (a) your employment
         with, or termination of employment from, Neoprobe (except in connection
         with your application for employment with another employer, or your
         application for any insurance, retirement, disability or unemployment
         benefits); (b) any other person's employment with, or termination of
         employment from, Neoprobe; or (c) any information or documents
         concerning Neoprobe. In the event that a subpoena or other lawful
         process is properly served upon you requiring production or disclosure
         of information or documents concerning the foregoing matters, you shall
         promptly notify Neoprobe's Human Resources department, in writing, and
         provide it with copies of any subpoena or other process served upon
         you. In the event that the subpoena or other process requires
<PAGE>   6
                                       -6-

         testimony or statements from you, you agree to meet, telephonically or
         in person, with attorneys or agents designated by Neoprobe, at a time
         and place designated by Neoprobe and prior to the testimony, for the
         purpose of discussing such testimony. Nothing herein shall give
         Neoprobe the right to control or dictate the content of any testimony
         given by you, or any documents produced by you, pursuant to subpoena or
         other lawful process. It is understood that you shall provide all
         information lawfully required of you.

20.      CONFIDENTIALITY OF THIS AGREEMENT. You agree that you will not reveal
         the existence of this Agreement, nor any terms thereof, to any person,
         entity, or organization, except to your immediate family, to your
         attorney, or as may be required by law.

22.      PERIOD OF REVIEW AND OTHER CONSIDERATIONS

         A.       DATE OF RECEIPT. You acknowledge that you received this
                  Agreement on or prior to February 16, 1998.

         B.       ATTORNEY CONSULTATION. You acknowledge that you have had the
                  opportunity to consult an attorney of your choice concerning
                  this Agreement, Release and Waiver.

         C.       PERIOD OF REVIEW. You acknowledge that you have been given at
                  least 45 days in which to consider signing this Agreement and
                  to review the list of (a) the job titles and ages of employees
                  who were selected for this separation program; and (b) the job
                  titles and ages of employees who were not selected for this
                  separation program. In the event you execute this Agreement
                  within less than 45 days of the date of its delivery to you,
                  you acknowledge that such decision was entirely voluntary and
                  that you have had the opportunity to consider this Agreement
                  for the entire 45 day period but decided to waive that
                  opportunity.

         D.       ENTIRE AGREEMENT. This Agreement, Release and Waiver, sets
                  forth the entire agreement between Neoprobe and yourself and
                  supersedes and renders null and void any and all prior or
                  contemporaneous oral or written understandings, statements,
                  representations or promises. This Agreement does not, however,
                  supersede the Employees' Agreement which remains in full force
                  and effect.

         E.       GOVERNING LAW. This Agreement shall be construed and governed
                  by the laws of the State of Ohio and adjudicated within the
                  exclusive jurisdiction of the courts having jurisdiction over,
                  Franklin County, Ohio.

         F.       REVOCATION OF AGREEMENT, RELEASE AND WAIVER. You understand
                  that you have the right to revoke this Agreement within seven
                  (7) days of your signing it, and that this Agreement shall not
                  become effective or enforceable until this seven (7) day
                  period has expired. To revoke this Agreement, Release and
                  Waiver, you
<PAGE>   7
                                      -7-

                  agree to notify in writing; Susan S. Gaunce, Director, Human
                  Resources, Neoprobe Corporation, 425 Metro Place North, Suite
                  300, Dublin, OH 43017. Unless so revoked, this Agreement will
                  be effective at 5:00 p.m. on such seventh day. You agree that
                  if you exercise your right to revoke this Agreement within
                  seven (7) days, your termination of employment will
                  nevertheless occur, you will not be entitled to the Severance
                  Benefits, and you will immediately return to Neoprobe any
                  consideration you have already received.

YOU ACKNOWLEDGE THAT YOU HAVE CAREFULLY READ AND FULLY UNDERSTAND ALL THE
PROVISIONS OF THIS AGREEMENT, RELEASE AND WAIVER, AND YOU ARE ENTERING INTO THIS
AGREEMENT VOLUNTARILY. YOU ACKNOWLEDGE THAT THE CONSIDERATION YOU ARE RECEIVING
IN EXCHANGE FOR EXECUTING THIS AGREEMENT IS GREATER THAN THAT WHICH YOU WOULD BE
ENTITLED TO IN THE ABSENCE OF THIS AGREEMENT. YOU HAVE NOT RELIED UPON ANY
REPRESENTATION OR STATEMENT, WRITTEN OR ORAL, NOT SET FORTH IN THIS AGREEMENT.


         WHEREFORE, the parties have read all of the foregoing, understand the
same, and agree to all of the provisions contained herein.


NEOPROBE CORPORATION                        WILLIAM A. EISENHARDT, Ph.D.

By:  /s/ David C. Bupp                      By:  /s/ William A. Eisenhardt, PhD.
    --------------------------------            --------------------------------
     David C. Bupp
     President

Dated:  February 23, 1998                   Dated:  February 23, 1998
       -------------------                         -------------------

<PAGE>   1
                                                                    Exhibit 11.1


                      NEOPROBE CORPORATION AND SUBSIDIARIES
                        COMPUTATION OF NET LOSS PER SHARE


                                                       Three Months Ended
                                                            March 31,
                                                     1997              1998
                                                     ----              ----

Net Loss                                         ($4,725,928)      ($7,063,612)

Weighted average number of shares outstanding:

Weighted average common shares
 outstanding beginning of period                  22,586,527        22,763,430

Weighted average common shares
 issued during period                                 65,946            15,847
                                                 -----------------------------


Weighted average number of shares outstanding
 used in computing basic net loss per share       22,652,473        22,779,277
                                                 =============================




Weighted average number of shares used in
 computing diluted net loss per share             22,652,473        22,779,277
                                                 =============================




Earnings (Net Loss) Per Share:
 Basic                                                ($0.21)           ($0.31)
                                                 =============================

 Diluted                                              ($0.21)           ($0.31)
                                                 =============================

<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                       8,344,484
<SECURITIES>                                 9,522,165
<RECEIVABLES>                                  906,116
<ALLOWANCES>                                   105,160
<INVENTORY>                                  1,189,182
<CURRENT-ASSETS>                            21,296,065
<PP&E>                                      14,226,201
<DEPRECIATION>                               2,819,054
<TOTAL-ASSETS>                              36,059,650
<CURRENT-LIABILITIES>                        6,073,940
<BONDS>                                      4,389,775
                                0
                                          0
<COMMON>                                        22,807
<OTHER-SE>                                  25,573,128
<TOTAL-LIABILITY-AND-EQUITY>                36,059,650
<SALES>                                        863,891
<TOTAL-REVENUES>                               863,891
<CGS>                                          224,473
<TOTAL-COSTS>                                  224,473
<OTHER-EXPENSES>                             5,226,696
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              10,623
<INCOME-PRETAX>                            (7,063,612)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                        (7,063,612)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (7,063,612)
<EPS-PRIMARY>                                   (0.31)
<EPS-DILUTED>                                   (0.31)
        

</TABLE>


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