CLINTRIALS RESEARCH INC
424B1, 1996-07-25
TESTING LABORATORIES
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<PAGE>   1
                                               Filed Pursuant to Rule 424(b)(1)
                                               Registration No. 333-06293
PROSPECTUS
 
                                2,617,334 SHARES
 
                       (LOGO) CLINTRIALS RESEARCH INC.
 
                                  COMMON STOCK
 
     The shares of Common Stock offered hereby (the "Offering") are being
offered by ClinTrials Research Inc. (the "Company" or "ClinTrials"). The
Company's Common Stock is traded on The Nasdaq Stock Market's National Market
(the "Nasdaq National Market") under the symbol "CCRO." On July 24, 1996, the
last reported sale price of the Common Stock on the Nasdaq National Market was
$33.00 per share. See "Price Range of Common Stock and Dividend Policy."
 
     SEE "RISK FACTORS" APPEARING ON PAGES 7 THROUGH 10 OF THIS PROSPECTUS FOR A
DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE
PURCHASERS OF THE COMMON STOCK OFFERED HEREBY.
 
                             ---------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
    ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
     CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
                                        PRICE TO           UNDERWRITING          PROCEEDS TO
                                         PUBLIC             DISCOUNT(1)          COMPANY(2)
- -------------------------------------------------------------------------------------------------
<S>                               <C>                  <C>                  <C>
Per Share.........................        $30.00               $1.44               $28.56
- -------------------------------------------------------------------------------------------------
Total(3)..........................      $78,520,020         $3,768,961           $74,751,059
- -------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------
</TABLE>
 
(1) The Company has agreed to indemnify the Underwriters against certain civil
    liabilities, including liabilities under the Securities Act of 1933, as
    amended. See "Underwriting."
(2) Before deducting estimated expenses of $700,000 payable by the Company.
(3) The Company has granted the Underwriters a 30 day over-allotment option to
    purchase up to 372,666 additional shares of Common Stock on the same terms
    and conditions as set forth above. If all such shares are purchased by the
    Underwriters, the total Price to Public will be $89,700,000, the total
    Underwriting Discount will be $4,305,600, and the total Proceeds to Company
    will be $85,394,400. See "Underwriting."
 
                             ---------------------
 
     The shares of Common Stock are offered subject to receipt and acceptance by
the several Underwriters, to prior sale and to the Underwriters' right to reject
any order in whole or in part and to withdraw, cancel or modify the offer
without notice. It is expected that certificates for the shares of Common Stock
will be available for delivery on or about July 29, 1996.
 
                             ---------------------
 
J.C. BRADFORD & CO.
                               PIPER JAFFRAY INC.
                                                              SMITH BARNEY INC.

                                 July 24, 1996
<PAGE>   2
 
                        (LOGO) ClinTrials Research Inc.
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the information requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and, in accordance
therewith, files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information may be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, and at the following Regional Offices of
the Commission: Chicago Regional Office, Citicorp Center, Suite 1400, 500 West
Madison Street, Chicago, Illinois 60661; and New York Regional Office, Seven
World Trade Center, Suite 1300, New York, New York 10007. Copies of such
material may be obtained from the Public Reference Section of the Commission at
450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed rates. The
Commission also maintains a web site (http://www.sec.gov) that contains reports,
proxy and information statements and other information regarding issuers that
file electronically with the Commission. The Common Stock is listed on the
Nasdaq National Market and reports, proxy material and other information
concerning the Company may be inspected at the offices of the Nasdaq Operations,
1735 K Street, N.W., Washington, D.C. 20006.
 
     The Company has filed with the Commission a Registration Statement on Form
S-3 under the Securities Act of 1933, as amended (the "Securities Act"), with
respect to the Common Stock offered hereby. This Prospectus does not contain all
of the information set forth in the Registration Statement and the exhibits and
schedules thereto, certain portions of which have been omitted in accordance
with the rules and regulations of the Commission. For further information with
respect to the Company and the Common Stock, reference is hereby made to the
Registration Statement, including the exhibits and schedules thereto. The
Registration Statement, together with its exhibits and schedules thereto, may be
inspected, without charge, at the Commission's principal office at 450 Fifth
Street, N.W., Washington, D.C. 20549, and also at the regional offices of the
Commission listed above. Copies of such materials may be obtained from the
Commission upon the payment of prescribed fees.
 
     Statements contained in the Prospectus as to any contracts, agreements or
other documents filed as an exhibit to or incorporated by reference in the
Registration Statement are qualified in all respects to the copy of such
contract, agreement or other document filed as an exhibit to or incorporated by
reference in the Registration Statement for a full statement of the provisions
thereof.
 
     IN CONNECTION WITH THE OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS THAT STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK
OFFERED HEREBY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET, IN THE
OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
     IN CONNECTION WITH THE OFFERING, CERTAIN UNDERWRITERS MAY ENGAGE IN PASSIVE
MARKET MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET IN
ACCORDANCE WITH RULE 10B-6a UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS
AMENDED. SEE "UNDERWRITING."
 
                                        2
<PAGE>   3
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by reference to the more
detailed information and financial statements, including the notes thereto,
appearing elsewhere or incorporated by reference in this Prospectus. Except as
otherwise indicated, all information in this Prospectus assumes no exercise of
the Underwriters' over-allotment option. All references in this Prospectus to
the "Company" or "ClinTrials" refer to ClinTrials Research Inc., a Delaware
corporation, and its subsidiaries.
 
                                  THE COMPANY
 
     ClinTrials is a leading contract research organization ("CRO") providing a
full range of services to the pharmaceutical, biotechnology and medical device
industries. The Company designs, monitors and manages clinical trials, provides
clinical data management and biostatistical services, and offers product
registration services throughout the United States and Europe. The Company has a
client base of 100 pharmaceutical and biotechnology companies, including the ten
largest pharmaceutical companies in the world, and in 1995 the Company performed
services for 69 clients. The Company's net service revenue increased 34.9% to
$57.8 million in 1995 from $42.9 million in 1994, and increased 49.9% to $17.7
million in the quarter ended March 31, 1996 from $11.8 million in the quarter
ended March 31, 1995. The Company has entered into an agreement to acquire
Bio-Research Laboratories Ltd., a leading preclinical CRO located in Montreal,
Quebec. See "-- Pending Bio-Research Acquisition."
 
     The Company believes worldwide research and development expenditures by the
pharmaceutical and biotechnology industries reached $30 billion in 1994,
approximately $10 billion of which was spent on clinical trials, with
approximately $2 billion being outsourced to CROs. Research and development
expenditures in 1994 for the largest 50 pharmaceutical companies in the world
(as measured by such expenditures) increased approximately 8% from the previous
year. The Company believes that certain industry trends will continue to
increase the need for pharmaceutical and biotechnology companies to outsource
the design and management of their clinical trials. These trends include: (i)
the desire of many pharmaceutical companies to respond to cost containment
pressures and reduce the high fixed costs associated with peak-load staffing for
drug development by relying on a combination of internal resources and CROs;
(ii) the attempt by pharmaceutical and biotechnology companies to globalize
clinical research and development to maximize profits from a given drug by
pursuing regulatory approvals in multiple countries simultaneously by
outsourcing to CROs with global capabilities; (iii) the efforts by
pharmaceutical and biotechnology companies to confront the increasingly complex
and stringent regulatory requirements in many jurisdictions by taking advantage
of the data management expertise, technological capabilities and global presence
of CROs; (iv) the escalation of worldwide research and development expenditures
for new drugs, including amounts spent on services of the type provided by CROs,
resulting from pressures to develop new drugs for the treatment of chronic
disorders and life-threatening diseases; (v) the desire by pharmaceutical
companies to reduce the time required to develop and bring a new drug to the
market by outsourcing preclinical and clinical trials to CROs that provide a
full range of services; (vi) the efforts by pharmaceutical companies to reserve
their internal resources for the development of new drugs by using CROs to
manage and conduct preclinical and clinical trials; and (vii) the maturation of
the biotechnology industry and the resulting increase in the demand for
expertise and services provided by outside sources, including CROs.
 
     The Company's strategy for capitalizing on the expected growth in the CRO
industry includes (i) providing comprehensive preclinical and clinical research
services, (ii) pursuing strategic alliances with selected clients, (iii)
expanding its international presence, (iv) developing capabilities in emerging
clinical areas and testing procedures, (v) continuing to invest in information
systems technology, (vi) broadening the Company's therapeutic expertise, and
(vii) increasing its client base and adding new contracts with existing clients.
The Company currently has strategic alliances with Baxter Healthcare
Corporation, Sandoz Pharmaceuticals Corporation and SmithKline Beecham
Corporation. In addition, the Company plans to make strategic acquisitions of
selected CROs or related businesses that provide one or more of the following:
complementary services, expanded geographic presence, therapeutic expertise or
complementary client bases.
 
                                        3
<PAGE>   4
 
     The Company has offices in Nashville, Tennessee; Research Triangle Park,
North Carolina; Lexington, Kentucky; Maidenhead, England; Brussels, Belgium;
Melbourne, Australia; Jerusalem, Israel; and Santiago, Chile.
 
                        PENDING BIO-RESEARCH ACQUISITION
 
     On May 24, 1996, ClinTrials announced a definitive agreement to acquire
Bio-Research Laboratories Ltd. of Montreal, Quebec ("Bio-Research") for
approximately $65 million in cash and the assumption of certain liabilities (the
"Acquisition"). The Company will use a portion of the proceeds of the Offering
to fund the Acquisition and related costs. Founded in 1965, Bio-Research is a
leading preclinical CRO, providing services to clients in the pharmaceutical,
biotechnology, chemical and medical device industries. Bio-Research designs and
conducts preclinical trials, based principally upon animal models, that produce
the data required to assess and evaluate efficacy in and potential risks to
humans. Bio-Research's service revenue increased 7.3% to $26.3 million in 1995
from $24.5 million in 1994, and decreased 14.9% to $6.3 million in the quarter
ended March 31, 1996 from $7.4 million in the quarter ended March 31, 1995.
 
     Bio-Research has an extensive client base including many large
pharmaceutical companies and leading biotechnology companies. In 1995, it
provided services to approximately 120 different clients, including eight of the
ten largest pharmaceutical companies in the world. Bio-Research offers
preclinical research study services, which are performed on a product for up to
a three year period in order to prepare an Investigational New Drug Application
("IND") for filing with the Food and Drug Administration (the "FDA") and similar
reports for filing with other governmental agencies. Such reports must be
approved by the appropriate governmental agency before the product can be tested
on humans. Bio-Research has particular expertise in the areas of osteoporosis
evaluation, infusion, pharmacology and biomaterials testing, bio-marker assays,
inhalation toxicology, reproductive toxicology and neurotoxicology, immunology,
metabolism and general toxicology.
 
     Bio-Research owns buildings that comprise approximately 204,000 square feet
of laboratory facility and office space in Senneville, Quebec, a suburb of
Montreal. The facilities include highly-specialized study rooms and
laboratories, together with sophisticated analytical equipment and security
systems. Approximately 133,500 square feet are allocated for preclinical
facilities, which consist of 72 standard study rooms, twelve large mass air
displacement study rooms, twelve inhalation treatment rooms, a behavioral
testing room and a surgical suite with adjacent physiological monitoring
facilities capable of accommodating four simultaneous surgical procedures. The
Company believes that the high cost of such facilities and equipment provides a
significant barrier to entry into the field of preclinical research.
 
     Management believes that the Acquisition will assist the Company in
achieving its objective of becoming a vertically integrated international CRO in
the following ways:
 
     - The Company will be one of what it believes to be only three large CROs
       able to offer clients the full range of preclinical and Phase I through
       Phase IV clinical trials.
 
     - Bio-Research will increase both the number and the geographic scope of
       the clients served by the Company, enabling the Company to cross-sell its
       services and enhance its relationships with existing clients.
 
     - Bio-Research will add a number of additional areas of therapeutic
       expertise to complement the Company's areas of proficiency.
 
     - Bio-Research's management team, with its international reputation and
       broad experience, will be an important asset for the Company.
 
     It is anticipated that the Acquisition will close substantially
simultaneously with the closing of the Offering. See "Bio-Research Acquisition"
and "Risk Factors -- No Assurance of Successful Integration of Bio-Research or
Other Acquisitions."
 
                                        4
<PAGE>   5
 
                              RECENT DEVELOPMENTS
 
     On July 18, 1996, ClinTrials announced its operating results for the second
quarter of 1996. Net service revenue increased 43.8% to $19.4 million from $13.5
million in the same period of 1995. Consolidated income before income taxes
increased 51.1% to $2.1 million compared to $1.4 million in the same period of
1995. Net income increased 56.2% to $1.3 million in the second quarter of 1996
compared to $817,000 in the same period of 1995. Earnings per share increased to
$0.14 in the 1996 period compared to $0.09 in the second quarter of 1995.
 
                                  THE OFFERING
 
Common Stock offered................     2,617,334 shares
 
Common Stock to be outstanding after
    the Offering....................     11,522,468 shares(1)
 
Use of proceeds.....................     To fund the Acquisition and for general
                                           corporate purposes. See "Use of
                                           Proceeds."
 
Nasdaq National Market Symbol.......     CCRO
- ---------------
 
(1) Excludes 582,049 shares of Common Stock reserved for issuance upon exercise
     of options granted pursuant to the Company's stock option plans.
 
                                        5
<PAGE>   6
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
     The following table sets forth certain summary financial information for
the Company and its subsidiaries as of and for each of the three fiscal years in
the period ended December 31, 1995, and as of and for the three months ended
March 31, 1995 and 1996, respectively. The unaudited pro forma summary financial
information set forth below has been prepared on a consolidated basis based upon
the historical financial statements of the Company and Bio-Research. The pro
forma statements of income data give effect to the Acquisition as if it had
occurred on January 1 of the respective period. The pro forma balance sheet data
as of March 31, 1996 gives effect to the Acquisition as if it had occurred on
March 31, 1996. The pro forma financial information is provided as additional
information only and is not necessarily indicative of actual results that would
have been achieved had the Acquisition been consummated at the beginning of the
periods presented or of future results. In particular, the Company does not
believe that the pro forma results of operations for the year ended December 31,
1995 are indicative of future results. See "Management's Discussion and Analysis
of Financial Condition and Results of Operations -- Pending Bio-Research
Acquisition -- Bio-Research's Results of Operations -- Quarter Ended March 31,
1996 Compared to Quarter Ended March 31, 1995." The following should be read in
conjunction with the related historical financial statements of the Company and
Bio-Research and the Unaudited Pro Forma Condensed Combined Financial Statements
incorporated by reference or included in this Prospectus.
 
<TABLE>
<CAPTION>
                                             YEAR ENDED DECEMBER 31,              THREE MONTHS ENDED MARCH 31,
                                    -----------------------------------------     -----------------------------
                                                                    PRO FORMA                         PRO FORMA
                                     1993        1994      1995       1995         1995      1996       1996
                                    -------     -------   -------   ---------     -------   -------   ---------
<S>                                 <C>         <C>       <C>       <C>           <C>       <C>       <C>
STATEMENTS OF INCOME DATA:
Service revenue...................  $49,939     $67,763   $86,217   $112,559      $18,030   $26,397    $32,721
Less subcontractor costs(1).......   14,655      24,889    28,371     28,371        6,247     8,727      8,727
                                    -------     -------   -------   ---------     -------   -------   ---------
Net service revenue...............   35,284      42,874    57,846     84,188       11,783    17,670     23,994
Operating costs and expenses:
  Direct costs....................   21,121      25,324    34,850     49,258        6,890    10,526     14,184
  Selling, general and
    administrative expenses.......   10,239      12,111    15,209     23,233        3,345     4,750      6,704
  Depreciation and amortization...    1,691       1,937     2,287      4,819          527       700      1,366
                                    -------     -------   -------   ---------     -------   -------   ---------
Income from operations............    2,233       3,502     5,500      6,878        1,021     1,694      1,740
Net income........................  $ 1,041(2)  $ 2,153   $ 3,601   $  6,368 (3)  $   721   $ 1,113    $ 1,411(3)
Net income per common and common
  equivalent share................  $  0.15(2)  $  0.24   $  0.40   $   0.56 (3)  $  0.08   $  0.12    $  0.12(3)
Number of shares and common stock
  equivalents used in computing
  per share amounts...............    6,919       9,000     9,088     11,404 (4)    9,043     9,185     11,501(4)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                   MARCH 31, 1996
                                                                         -----------------------------------
                                                                                       AS         PRO FORMA
                                                                         ACTUAL    ADJUSTED(5)   AS ADJUSTED
                                                                         -------   -----------   -----------
<S>                                                                      <C>       <C>           <C>
BALANCE SHEET DATA:
Cash, cash equivalents and held-to-maturity securities.................  $16,831    $  90,882     $  31,430
Working capital........................................................   17,443       91,494        36,327
Total assets...........................................................   61,652      135,703       141,084
Long-term debt.........................................................       --           --            --
Stockholders' equity...................................................   32,108      106,159       106,159
</TABLE>
 
- ---------------
 
(1) Subcontractor costs consist primarily of costs for third-party physicians
    that are passed through to the Company's clients. Amounts vary from contract
    to contract. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations."
(2) Includes the $0.04 per share cumulative effect of accounting change
    resulting from the adoption of FASB Statement No. 109, "Accounting for
    Income Taxes" effective as of January 1, 1993.
(3) Interest income from the net cash proceeds from the Offering received in
    excess of the cash used to acquire Bio-Research is not reflected in the pro
    forma columns. If interest income had been earned on the excess proceeds,
    pro forma income would have been $6,740,000, or $0.58 per share, for the
    year ended December 31, 1995, and $1,504,000, or $0.13 per share, for the
    three months ended March 31, 1996. See Unaudited Pro Forma Condensed
    Combined Statements of Income and Notes thereto.
(4) The weighted average common shares outstanding in the pro forma columns
    include the 2,316,000 shares of Common Stock offered hereby that will be
    used to fund the $65 million cost of the Acquisition. The calculation of
    these shares is based on the offering price of $30.00 per share, net of
    offering costs.
(5) Adjusted to reflect the sale by the Company of the 2,617,334 shares of
    Common Stock offered hereby and the proposed application of the estimated
    net proceeds therefrom. See "Use of Proceeds."
 
                                        6
<PAGE>   7
 
                                  RISK FACTORS
 
     Investors should carefully consider the following matters in connection
with an investment in the Common Stock in addition to the other information
contained or incorporated by reference in this Prospectus. Information contained
or incorporated by reference in this Prospectus may contain "forward-looking
statements" within the meaning of the Private Securities Litigation Reform Act
of 1995, which can be identified by the use of forward-looking terminology such
as "may," "will," "expect," "anticipate," "estimate" or "continue" or the
negative thereof or other variations thereon or comparable terminology. The
following matters constitute cautionary statements identifying important factors
with respect to any such forward-looking statements, including certain risks and
uncertainties, that could cause actual results to differ materially from those
reflected in any such forward-looking statements.
 
NO ASSURANCE OF SUCCESSFUL INTEGRATION OF BIO-RESEARCH OR OTHER ACQUISITIONS
 
     The Acquisition, if completed, will change the business of the Company to
include preclinical trial services, increase the number of Company employees and
increase the Company's net service revenue. There can be no assurance that
Bio-Research, once acquired, will be integrated successfully into the Company's
operations or that it will not have a material adverse effect upon the Company's
results of operations, financial condition or business prospects. ClinTrials
currently has no experience in preclinical trials; therefore, the success of the
Company's integration of Bio-Research may depend on the retention of current
Bio-Research management. Although the Company intends to retain such employees,
there can be no assurance that such individuals will remain with the Company.
 
     In addition, Bio-Research benefits significantly from certain Canadian
research and development tax credits. Any future reduction in the availability
or amount of these tax credits will have an adverse effect upon the Company's
profitability. See "Management Discussion and Analysis of Financial Condition
and Results of Operations -- Overview."
 
     A significant component of the Company's historical growth has come through
acquisitions of other CROs, and the Company's growth strategy includes possible
additional acquisitions. Any other acquisitions which the Company may pursue
will also involve risks, including the possible inability to integrate the
operations and services of the acquired business, the expenses incurred in
connection with the acquisition, the diversion of management's attention from
other business concerns and the potential loss of key employees of the acquired
business. Acquisitions of foreign companies also may involve the additional
risks of, among others, integration of foreign business practices and overcoming
language barriers. There can be no assurance that any such acquisitions will not
have a material adverse effect upon the Company's results of operations,
financial condition or business prospects.
 
FLUCTUATION IN QUARTERLY OPERATING RESULTS
 
     The Company's quarterly operating results have fluctuated as a result of
factors such as delays experienced in implementing or completing particular
clinical trials, termination of clinical trials and the costs associated with
integrating acquired operations. Since a high percentage of the Company's
operating costs are relatively fixed while revenue recognition is subject to
fluctuation, minor variations in the timing of contracts or the progress of
trials may cause significant variations in quarterly operating results. Results
of one quarter are not necessarily indicative of results for the next quarter.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Overview."
 
DEPENDENCE ON CERTAIN INDUSTRIES AND CLIENTS
 
     The Company provides services primarily to the pharmaceutical and
biotechnology industries. Accordingly, the Company's net service revenue is
substantially dependent on these industries' expenditures on research and
development. Although these expenditures are large, the number of potential CRO
clients is relatively limited and it is not uncommon for a CRO to derive over
10% of its revenue from a single client. The Company has in the past derived and
may in the future derive a significant portion of its net service revenue from a
relatively limited number of clients. The loss of any such client could
materially adversely affect the
 
                                        7
<PAGE>   8
 
Company's results of operations. In the first quarter of 1996, two clients
accounted for 25% and 16% of the Company's net service revenue, respectively. In
addition, two clients accounted for 25% and 18% of such revenue in 1995 and two
clients accounted for 21% and 13% of such revenue in 1994. No other client
accounted for more than 10% of the Company's net service revenue during such
periods. The Company's operations could be materially and adversely affected by,
among other factors, any economic downturn in the pharmaceutical or
biotechnology industries, any decrease in their research and development
expenditures, or a change in the governmental regulations pursuant to which
these industries operate. Furthermore, management believes that the Company has
benefitted to date from the increasing tendency of pharmaceutical and
biotechnology companies to outsource the performance and analysis of large
clinical research projects to independent parties. Should this tendency be
reduced or halted entirely, the Company's operations would be materially and
adversely affected. See "Business -- Industry Trends" and "-- Clients and
Marketing."
 
LOSS OF CLINICAL RESEARCH CONTRACTS
 
     Clients of the Company generally have the right to terminate a contract at
any time during a clinical trial, potentially causing periods of excess capacity
and reductions in net service revenue and net income. Trials may be terminated
for various reasons, including unexpected or undesired results, inadequate
patient enrollment or investigator recruitment, production problems resulting in
shortages of the drug, adverse patient reactions to the drug or the client's
decision to de-emphasize a particular trial. The termination of any one trial
would typically not have a material adverse impact on the Company. The loss of a
large trial or the simultaneous loss of multiple trials, however, could result
in unplanned periods of excess capacity and adversely affect the Company's
backlog, future revenue and profitability. In most instances, if a contract is
terminated, the Company is entitled to receive revenue earned to date as well as
a termination fee. However, because the Company's contracts are predominantly
fixed price contracts, the Company bears the risk of cost overruns. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Overview."
 
COMPETITION
 
     The Company competes primarily against the in-house research departments of
pharmaceutical companies, other CROs, universities and teaching hospitals. The
CRO industry is highly fragmented, with approximately 20 full-service CROs and
many small, limited-service CROs. In recent years, several large, full-service
competitors have emerged, some of which have substantially greater capital and
other resources, are better known and have more experienced personnel than the
Company. The recent trend toward industry consolidation is likely to result in
heightened competition among the larger CROs. Increased competition may lead to
price and other forms of competition that may adversely affect the Company's
results of operations. Although the financial costs of entry into the industry
are relatively low, the larger CROs are increasingly required to have
substantial amounts of working capital in order to sustain internal growth and
international expansion, and to meet credit-worthiness standards of their larger
clients. See "Business -- Competition."
 
MANAGEMENT OF GROWTH; DEPENDENCE ON KEY PERSONNEL
 
     In addition to growth resulting from the acquisition of Bio-Research, the
Company has experienced growth that has placed, and is likely to continue to
place, a significant demand on its management resources. The Company's
successful implementation of its growth strategy depends upon its ability to
attract and retain qualified management and professional, scientific and
technical operating personnel including such personnel in its foreign
operations. The growth of the Company's foreign operations may involve
additional demands on management such as assimilating differences in foreign
business practices and overcoming language barriers. The loss of the services of
any of the Company's key executives or the failure to manage growth effectively
could have a material adverse effect on the Company. There can be no assurance
that the Company will be able to attract and retain sufficient numbers of
qualified personnel.
 
                                        8
<PAGE>   9
 
HEALTH CARE INDUSTRY REFORM
 
     The health care industry is subject to changing political, economic and
regulatory influences that may affect the pharmaceutical and biotechnology
industries. In recent years, several comprehensive health care reform proposals
were introduced in the United States Congress. The intent of the proposals was,
generally, to expand health care coverage for the uninsured and reduce the
growth of total health care expenditures. While none of the proposals were
adopted, health care reform may again be addressed by the United States
Congress. In addition, foreign governments may also undertake health care
reforms in their respective countries. Implementation of government health care
reform may adversely affect research and development expenditures by
pharmaceutical and biotechnology companies, which could decrease the business
opportunities available to the Company. The Company is unable to predict the
likelihood of such or similar legislation being enacted into law or the effect
such legislation would have on the Company.
 
GOVERNMENTAL REGULATION
 
     The Company's business has resulted from the extensive regulatory framework
imposed by various governments on the drug development process. The services
provided by the Company are ultimately subject to regulation by the FDA in the
United States and comparable agencies in other countries, although the level of
applicable regulation in other countries is generally less comprehensive than in
the United States. The Company is obligated to comply with FDA regulations
governing such activities as selecting qualified investigators, obtaining
required forms from investigators, verifying that patient informed consent is
obtained, monitoring the validity and accuracy of data, verifying drug/device
accountability and instructing investigators to maintain records and reports.
The Company must also maintain records for each study for specified periods for
inspection by the study sponsor and the FDA during audits. Any failure to comply
adequately with Federal regulations and guidelines could have a material adverse
effect on the Company. In the European Community (the "EC"), the general trend
has been toward coordination of common standards for clinical testing of new
drugs, leading to changes in the various requirements imposed by each country.
Changes in regulation, including, without limitation, a relaxation in regulatory
requirements or the introduction of simplified drug approval procedures, could
materially and adversely affect the demand for the services offered by the
Company.
 
POTENTIAL LIABILITY FROM OPERATIONS
 
     Clinical trials involve the testing of approved and experimental drugs on
human subjects. Such testing creates a significant risk of liability for
personal injury or death to participants that have an adverse reaction to the
trial drug. Although the Company's employees and agents do not have direct
contact with the participants in any clinical trial, the Company does select and
contract on behalf of its clients with physicians who render professional
services, including the administration of the drugs being tested, to persons
participating in clinical trials. As a result, the Company may be subject to
claims in the event of personal injury or death of persons participating in
clinical trials and arising from professional malpractice of such physicians.
Although the Company is generally indemnified by its clients, in order for such
indemnification to be valid, the Company and its employees and agents must act
within the bounds of specific procedural requirements governing the conduct of
each clinical trial. Since the Company's indemnification provisions are
negotiated agreements and such provisions necessarily depend upon the financial
viability of the indemnifying party, no assurance can be given that these
indemnities will be available to the Company in each or any instance of
liability. In addition, preclinical and clinical trials involve the compilation
and interpretation of a significant amount of statistical data, which may
subject the Company to claims of statistical errors. Bio-Research is currently a
party to such a claim. See "Business -- Litigation" and Note 11 of Notes to the
Bio-Research Laboratories Ltd. Financial Statements.
 
EXCHANGE RATE FLUCTUATIONS
 
     Approximately 4.3%, 9.9%, 11.6% and 12.6% of the Company's net service
revenue for 1993, 1994, 1995, and the first quarter of 1996, respectively, were
derived from the Company's operations outside of the United States. Following
the Acquisition, these percentages will increase and on a pro forma basis were
approximately
 
                                        9
<PAGE>   10
 
39.3% in 1995 and 35.6% in the first quarter of 1996. Since the revenues and
expenses of the Company's foreign operations are generally denominated in local
currencies, exchange rate fluctuations between local currencies and the United
States dollar will subject the Company to currency translation risk with respect
to the results of its foreign operations. The cash receipts of Bio-Research are
not all denominated in Canadian dollars. Therefore, following the Acquisition,
the Company will be subject to transaction risk to the extent it is unable to
shift to its clients the effects of currency exchange rate fluctuations.
Although Bio-Research currently hedges against exchange rate fluctuations to
some extent, such fluctuations could have a material adverse effect on the
Company's results of operations. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations -- Overview."
 
CONTROL BY CERTAIN STOCKHOLDERS
 
     The Company's four largest stockholders, each of whom is a director, will
beneficially own approximately 34.0% of the outstanding shares and, together
with other affiliates of the Company, will beneficially own approximately 35.5%
of the outstanding shares, upon completion of the Offering. As a result, such
persons, if they were to act in concert, would have the ability to exert
significant influence over the election of the Company's directors and thus the
business policies and affairs of the Company. This concentration of ownership
may also have the effect of delaying or preventing a change in control of the
Company and could likewise bring about the sale or merger of the Company under
terms favorable or unfavorable to all other stockholders. See "Principal
Stockholders."
 
VOLATILITY OF MARKET PRICE
 
     From time to time after the Offering, there may be significant volatility
in the market price for the Common Stock. The Company believes that the current
market price of the Common Stock reflects expectations that the Company will be
able to continue to experience significant growth either internally or through
acquisitions. If the Company is unable to operate at a pace that reflects the
expectations of the market, investors could sell shares of the Common Stock
resulting in a decrease in the market price of the Common Stock. In addition to
quarterly operating results of the Company, changes in earnings estimated by
analysts, general conditions in the economy, the financial markets or the health
care, pharmaceutical, biotechnology or CRO industries, implementation of
proposed health care reforms or other developments affecting the Company could
cause the market price of the Common Stock to fluctuate substantially. In
addition, in recent years the stock market has experienced extreme price and
volume fluctuations. This volatility has had a significant effect on the market
prices of securities issued by many companies for reasons unrelated to their
operating performance.
 
                                       10
<PAGE>   11
 
                            BIO-RESEARCH ACQUISITION
 
     On May 24, 1996, the Company, Bio-Research and the shareholders of
Bio-Research entered into a definitive Asset Purchase Agreement (the "Purchase
Agreement"). Pursuant to the Purchase Agreement, the Company will purchase the
assets of Bio-Research for $65 million in cash, subject to adjustment based on a
comparison of Bio-Research's net working capital (as defined in the Purchase
Agreement) at the closing with such amount at December 31, 1995. The Company
will assume essentially all liabilities of Bio-Research. It is anticipated that
the closing of the Acquisition and the closing of the Offering will occur
substantially simultaneously.
 
     The closing of the Acquisition is subject to certain contingencies common
to acquisitions of this type, including the continued truthfulness of the
representations and warranties, the lack of any court or governmental agency
prohibition against the transaction and the receipt of any necessary
governmental approvals. In addition, ClinTrials' obligation to close is subject
to the execution and delivery of an employment agreement between ClinTrials and
Bio-Research's president, Michael F. Ankcorn, and the existence of certain
levels of shareholders' equity, cash and backlog for Bio-Research. Neither the
obtaining of financing nor the successful completion of the Offering is a
condition to the closing of the Acquisition.
 
     Bio-Research and its shareholders, in proportion to their ownership, have
agreed to indemnify ClinTrials against any and all claims, losses, costs and
expenses resulting from (i) any breach of any of the covenants, obligations,
representations or warranties contained in the Purchase Agreement or any
document delivered pursuant thereto, (ii) any liability of Bio-Research not
expressly assumed by ClinTrials under the Purchase Agreement, and (iii) any
claim not previously disclosed to ClinTrials which is brought or asserted by any
third party against ClinTrials arising out of the ownership, licensing,
operation, action, inaction or conduct of Bio-Research or any of Bio-Research's
assets or any of Bio-Research's employees, agents or independent contractors,
relating to all periods of time prior to the closing of the Acquisition. The
Purchase Agreement provides that no recovery shall be available until the loss
exceeds $500,000, except in the case of fraud. The Purchase Agreement also
limits the maximum indemnification to the purchase price. The Purchase Agreement
limits the time period in which claims may be made to two years after the
closing of the Acquisition; provided that claims related to tax matters or fraud
may be made at any time before 60 days after the expiration of the statute of
limitations applicable to the underlying claim.
 
                                       11
<PAGE>   12
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the Common Stock offered
hereby are estimated to be $74.1 million ($84.7 million if the Underwriters'
over-allotment option is exercised in full) after deducting the underwriting
discount and estimated offering expenses. Of the net proceeds, approximately $65
million will be used to fund the purchase price of the Acquisition and related
costs. The Company intends to use the remaining net proceeds of the Offering for
working capital and other general corporate purposes. The Company has
experienced an increasing demand for working capital in order to meet the
credit-worthiness standards set by its larger clients. Other than the
Acquisition, no binding agreements or firm commitments currently exist to make
any acquisition.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
     The Company's Common Stock is listed on the Nasdaq National Market under
the symbol "CCRO." The following table sets forth, for the periods indicated,
the high and low sale prices for the Common Stock as reported by the Nasdaq
National Market:
 
<TABLE>
<CAPTION>
    1994                                                                    HIGH     LOW
    ---------------------------------------------------------------------  ------   ------
    <S>                                                                    <C>      <C>
    First Quarter........................................................  $13.75   $11.25
    Second Quarter.......................................................   11.88     5.50
    Third Quarter........................................................    8.63     6.50
    Fourth Quarter.......................................................   10.50     7.63
    1995
    First Quarter........................................................  $13.00   $ 9.00
    Second Quarter.......................................................   13.50    10.38
    Third Quarter........................................................   20.25    13.00
    Fourth Quarter.......................................................   21.13    17.00
    1996
    First Quarter........................................................  $35.63   $19.50
    Second Quarter.......................................................   50.50    34.00
    Third Quarter (through July 24, 1996)................................   49.13    32.00
</TABLE>
 
     On July 24, 1996, the last reported sale price for the Common Stock on the
Nasdaq National Market was $33.00 per share. At July 24, 1996, there were
approximately 189 holders of record of the Common Stock.
 
     The Company has never declared or paid a cash dividend on its Common Stock
and does not anticipate paying any cash dividends in the foreseeable future. In
addition, the Company's credit facility prohibits the payment of dividends so
long as there is indebtedness outstanding thereunder.
 
                                       12
<PAGE>   13
 
                                 CAPITALIZATION
 
     The following table sets forth the capitalization of the Company as of
March 31, 1996, (i) on an actual basis, (ii) on an as adjusted basis to reflect
the sale of 2,617,334 shares of Common Stock offered by the Company hereby, and
(iii) on a pro forma as adjusted basis to give effect to the sale of 2,617,334
shares of Common Stock offered by the Company hereby and to reflect the
Acquisition. See "Use of Proceeds" and the Unaudited Pro Forma Condensed
Combined Financial Statements.
 
<TABLE>
<CAPTION>
                                                                         MARCH 31, 1996
                                                             ---------------------------------------
                                                                                          PRO FORMA
                                                             ACTUAL      AS ADJUSTED     AS ADJUSTED
                                                             -------     -----------     -----------
                                                                         (IN THOUSANDS)
<S>                                                          <C>         <C>             <C>
Long term debt.............................................  $    --      $      --       $      --
                                                             -------     -----------     -----------
Stockholders' equity:
  Preferred stock, $0.01 par value; 1,000,000 shares
     authorized; no shares issued or outstanding...........       --             --              --
  Common stock, $0.01 par value; 30,000,000 shares
     authorized; 8,842,427 shares issued and outstanding
     and 11,459,761 shares issued and outstanding, as
     adjusted(1)...........................................       88            114             114
  Additional paid-in capital...............................   40,180        114,205         114,205
  Retained earnings (deficit)..............................   (8,229)        (8,229)         (8,229)
  Cumulative foreign currency translation adjustments......       69             69              69
                                                             -------     -----------     -----------
          Total stockholders' equity.......................   32,108        106,159         106,159
                                                             -------     -----------     -----------
               Total capitalization........................  $32,108      $ 106,159       $ 106,159
                                                             =======      =========       =========
</TABLE>
 
- ---------------
 
(1) Excludes 652,652 shares of Common Stock reserved for issuance upon exercise
     of options granted pursuant to the Company's stock option plans.
 
                                       13
<PAGE>   14
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
     The following selected financial data for the three years ended December
31, 1995, are derived from the audited consolidated financial statements of the
Company, which have been audited by Ernst & Young LLP, independent auditors. The
financial data for the three-month periods ended March 31, 1996 and 1995 are
derived from unaudited financial statements. The unaudited financial statements
include all adjustments, consisting of normal recurring accruals, which the
Company considers necessary for a fair presentation of the financial position
and the results of operations for these periods. Operating results for the three
months ended March 31, 1996 are not necessarily indicative of the results that
may be expected for the entire year ending December 31, 1996.
 
     The following selected pro forma financial information is derived from the
unaudited pro forma condensed combined financial statements included elsewhere
in this Prospectus and is based upon the consolidated financial statements of
each of the Company and Bio-Research, adjusted to give effect to the
Acquisition. The selected pro forma statements of income for the year ended
December 31, 1995 and the three months ended March 31, 1996 give effect to the
Acquisition as if it had occurred on January 1, 1995. The pro forma balance
sheet data as of March 31, 1996 gives effect to the Acquisition as if it had
occurred on March 31, 1996.
 
     All information contained in the following tables should be read in
conjunction with "Capitalization," "Management's Discussion and Analysis of
Financial Condition and Results of Operations," the Unaudited Pro Forma
Condensed Combined Financial Statements of the Company and the consolidated
financial statements and related notes of the Company and Bio-Research
incorporated by reference or included herein.
 
<TABLE>
<CAPTION>
                                                                                                         THREE MONTHS ENDED
                                                                YEAR ENDED DECEMBER 31,                       MARCH 31,
                                                        ---------------------------------------     -----------------------------
                                                                                      PRO FORMA                         PRO FORMA
                                                         1993      1994      1995       1995         1995      1996       1996
                                                        -------   -------   -------   ---------     -------   -------   ---------
<S>                                                     <C>       <C>       <C>       <C>           <C>       <C>       <C>
STATEMENTS OF INCOME DATA:
Revenue:
  Service revenue.....................................  $49,939   $67,763   $86,217   $112,559      $18,030   $26,397    $32,721
  Less subcontractor costs (1)........................   14,655    24,889    28,371     28,371        6,247     8,727      8,727
                                                        -------   -------   -------   ---------     -------   -------   ---------
Net service revenue...................................   35,284    42,874    57,846     84,188       11,783    17,670     23,994
Operating costs and expenses:
  Direct costs........................................   21,121    25,324    34,850     49,258        6,890    10,526     14,184
  Selling, general and administrative expenses........   10,239    12,111    15,209     23,233        3,345     4,750      6,704
  Depreciation and amortization.......................    1,691     1,937     2,287      4,819          527       700      1,366
                                                        -------   -------   -------   ---------     -------   -------   ---------
Income from operations................................    2,233     3,502     5,500      6,878        1,021     1,694      1,740
Other income (expense)................................     (255)      497       665      1,028          203       201        277
                                                        -------   -------   -------   ---------     -------   -------   ---------
Income before income taxes and cumulative effect of
  accounting change...................................    1,978     3,999     6,165      7,906        1,224     1,895      2,017
Provision for income taxes............................    1,180     1,846     2,564      1,538          503       782        606
                                                        -------   -------   -------   ---------     -------   -------   ---------
Income before cumulative effect of accounting
  change..............................................      798     2,153     3,601      6,368          721     1,113      1,411
Cumulative effect as of January 1, 1993 of change in
  method of accounting for income taxes...............      243        --        --         --           --        --         --
                                                        -------   -------   -------   ---------     -------   -------   ---------
Net income............................................  $ 1,041   $ 2,153   $ 3,601   $  6,368 (2)  $   721   $ 1,113    $ 1,411(2)
                                                        =======   =======   =======   ========      =======   =======   ========
Earnings per common and common equivalent share before
  cumulative effect of accounting change..............  $  0.11   $  0.24   $  0.40   $   0.56 (2)  $  0.08   $  0.12    $  0.12(2)
                                                        =======   =======   =======   ========      =======   =======   ========
Net income per share..................................  $  0.15   $  0.24   $  0.40   $   0.56      $  0.08   $  0.12    $  0.12
                                                        =======   =======   =======   ========      =======   =======   ========
Number of shares and common stock equivalents used in
  computing per common and common equivalent share....    6,919     9,000     9,088     11,404 (3)    9,043     9,185     11,501(3)
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                              AS OF MARCH 31,
                                                                                  AS OF DECEMBER 31,        -------------------
                                                                              ---------------------------             PRO FORMA
                                                                               1993      1994      1995      1996       1996
                                                                              -------   -------   -------   -------   ---------
<S>                                                                           <C>       <C>       <C>       <C>       <C>
BALANCE SHEET DATA:
Cash, cash equivalents, and held-to-maturity securities.....................  $22,130   $21,045   $17,031   $16,831   $ 31,430
Working capital.............................................................   12,088    14,044    16,867    17,443     36,327
Total assets................................................................   47,318    49,680    58,626    61,652    141,084
Long-term debt..............................................................       --        --        --        --         --
Stockholders' equity........................................................   24,409    26,717    30,951    32,108    106,159
</TABLE>
 
- ---------------
 
(1) Subcontractor costs consist primarily of costs for third-party physicians
    that are passed through to the Company's clients. Amounts vary from contract
    to contract. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations."
(2) Interest income from the net cash proceeds from the Offering received in
    excess of the cash used to acquire Bio-Research is not reflected in the pro
    forma columns. If interest income had been earned on the excess proceeds,
    pro forma income would have been $6,740,000, or $0.58 per share, for the
    year ended December 31, 1995, and $1,504,000, or $0.13 per share, for the
    three months ended March 31, 1996. See the Unaudited Pro Forma Condensed
    Combined Statements of Income and Notes thereto.
(3) The weighted average common shares outstanding in the pro forma columns
    include the 2,316,000 shares of Common Stock offered hereby that will be
    used to fund the $65 million cost of the Acquisition. The calculation of
    these shares is based on the offering price of $30.00 per share, net of
    offering costs.
 
                                       14
<PAGE>   15
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
     The following discussion includes certain forward-looking statements.
Investors are cautioned that all forward-looking statements involve risks and
uncertainties, including without limitation, those discussed in "Risk Factors."
Although the Company believes that the assumptions underlying the
forward-looking statements contained herein are reasonable, any of the
assumptions could be inaccurate, and therefore, there can be no assurance that
the forward-looking statements included in this Prospectus will prove to be
accurate. In light of the significant uncertainties inherent in the
forward-looking statements included herein, the inclusion of such information
should not be regarded as a representation by the Company or any other person
that the objectives and plans of the Company will be achieved.
 
     The Company is a full-service clinical research organization serving the
pharmaceutical, biotechnology and medical device industries. The Company
designs, monitors and manages clinical trials, provides clinical data management
and biostatistical services and offers product registration services throughout
the United States and Europe. The Company generates substantially all of its
revenue from the clinical testing of new pharmaceutical and biotechnology
products.
 
     The Company's contracts are typically fixed priced, multi-year contracts
that require a portion of the contract amount to be paid at or near the time the
trial is initiated. The Company generally bills its clients upon the completion
of negotiated performance requirements and, to a lesser extent, on a date
certain basis. The Company's contracts generally may be terminated with or
without cause. In the event of termination, the Company is typically entitled to
all sums owed for work performed through the notice of termination and all costs
associated with termination of the study. In addition, most of the Company's
contracts provide for an early termination fee, the amount of which usually
declines as the trial progresses. Termination or delay in the performance of a
contract occurs for various reasons, including, but not limited to, unexpected
or undesired results, inadequate patient enrollment or investigator recruitment,
production problems resulting in shortages of the drug, adverse patient
reactions to the drug, or the client's decision to de-emphasize a particular
trial.
 
     Revenue for contracts is recognized on a percentage of completion basis as
work is performed. Revenue is affected by the mix of trials conducted and the
degree to which labor is utilized. The Company routinely subcontracts with
third-party investigators in connection with multi-site clinical trials and with
other third party service providers for laboratory analysis and other
specialized services. These costs are passed through to clients and, in
accordance with industry practice, are included in service revenue.
Subcontractor services may vary significantly from contract to contract;
therefore, changes in service revenue may not be indicative of trends in revenue
growth. Accordingly, the Company views net service revenue, which consists of
service revenue less subcontractor costs, as its primary measure of revenue
growth. The Company has had, and will continue to have, certain clients from
which at least 10% of the Company's overall revenue is generated over multiple
contracts. Such concentrations of business are not uncommon within the CRO
industry.
 
     The Company's quarterly operating results may fluctuate as a result of
factors such as delays experienced in implementing or completing particular
clinical trials and termination of clinical trials, the costs associated with
integrating acquired operations, as well as the costs associated with opening
new offices. Since a high percentage of the Company's operating costs are
relatively fixed while revenue is subject to fluctuation, minor variations in
the timing of contracts or the progress of clinical trials (both delays and
accelerations) may cause significant variations in quarterly operating results.
Results of one quarter are not necessarily indicative of results for the next
quarter.
 
     The Company's core business in the United States has experienced
significant growth, reflecting both an expansion of the Company's client base
and an increase in the number and size of projects under management. Prior to
1992, the Company's European operations primarily performed services required by
contracts generated by United States operations. In late 1992, the Company began
expanding its European operations, which contributed significantly to operating
losses for 1993 and 1994 in Europe. European operations broke even in 1995, and
are expected to become profitable in 1996. Recently, the Company expanded its
 
                                       15
<PAGE>   16
 
international operations by opening offices in Australia, Israel and Chile. This
was done partially in response to client requests for the Company to provide
services in these areas. The Company plans to continue to develop these and
other operations abroad. This will require additional investments in marketing
and infrastructure and may include the establishment of other new offices. As a
result, the Company expects its new offices to incur losses at least through
1996.
 
     Contracts between the Company's United Kingdom subsidiary and its clients
are generally denominated in pounds sterling. Payments received for services
rendered on such contracts, as well as payments made for the subsidiaries'
expenses, are in pounds sterling. Therefore, the subsidiary recognizes revenue
and expense in pounds sterling and its earnings are not materially affected by
fluctuations in exchange rates. Due to the Company's expansion abroad as
discussed previously, it is possible the Company's subsidiaries will enter into
contracts which are denominated in currencies other than the local currency of
the subsidiary. Because substantially all of the subsidiaries' expenses are paid
in the local currency of that subsidiary, fluctuations in exchange rates may
affect the subsidiaries' earnings.
 
     The Company's consolidated financial statements are denominated in U.S.
dollars and, accordingly, changes in the exchange rates between the Company's
subsidiaries' local currency and the U.S. dollar will affect the translation of
such subsidiaries' financial results into U.S. dollars for purposes of reporting
the Company's consolidated financial results. Translation adjustments are
reported as a separate section of stockholders' equity. To date, such
adjustments have not been material to the Company's financial statements.
 
     Following the Acquisition, a greater percentage of the Company's net
service revenue will be derived from operations outside the United States. The
cash receipts of Bio-Research are not all denominated in Canadian dollars;
therefore, following the Acquisition, the Company will be subject to transaction
risk to the extent it is unable to shift to its clients the effects of currency
exchange rate fluctuations. Although Bio-Research currently hedges against
exchange rate fluctuations to some extent through the purchase of forward
currency exchange contracts on a monthly basis, such fluctuations could have a
material adverse effect on the Company's results of operations.
 
     Following the Acquisition, the Company, through Bio-Research, will benefit
from both Canadian and Quebec research and development tax credits. At the
Canadian level, investment tax credits ("ITCs") are generated at the rate of 20%
of qualifying current and capital expenditures net of the amount of contractual
payments made to Bio-Research by certain customers that may claim ITCs directly.
Bio-Research is able to use these ITCs to reduce up to 100% of Canadian taxes
otherwise payable. Unused ITCs may be carried forward for ten years to offset
future Canadian taxes otherwise payable over this period. Although ClinTrials
cannot purchase any unused ITCs, following the Acquisition it expects to
generate new ITCs from the continued operations of Bio-Research. In addition to
ITCs, a Quebec refundable tax credit is available at the rate of 20% of total
qualifying salaries paid by Bio-Research for scientific research and
experimental development conducted by Bio-Research in Quebec net of the amount
of contractual payments made by customers that may claim Quebec refundable tax
credits directly under the Taxation Act (Quebec). The Quebec tax credit may be
used to reduce Quebec provincial taxes and may generate refunds should this
credit exceed the provincial tax liability. As a result of these tax credits,
Bio-Research had an effective tax rate of negative 38% in 1995.
 
RESULTS OF OPERATIONS
 
  Quarter Ended March 31, 1996 Compared to Quarter Ended March 31, 1995
 
     Net service revenue increased 49.9% to $17.7 million in the first quarter
of 1996 from $11.8 million in the same period of 1995. This increase resulted
primarily from an increase in the number of contracts under management and in
the size of such contracts. The backlog at March 31, 1996 was $98.8 million,
representing 217 contracts from 58 clients, as compared to $71.8 million at
March 31, 1995, representing 147 contracts from 44 clients.
 
     Direct costs increased 52.7% to $10.5 million in the first quarter of 1996
from $6.9 million in the same period of 1995, and increased as a percentage of
net service revenue to 59.6% from 58.5%. Direct costs, as a
 
                                       16
<PAGE>   17
 
percentage of net revenue, may fluctuate from one period to the next based on
the mix of contracts in the backlog as of any given date. In addition, direct
costs may fluctuate due to changes in labor utilization resulting from the
growth the Company has experienced.
 
     Selling, general and administrative costs increased 42.0% to $4.7 million
in the first quarter of 1996 from $3.3 million in the same period of 1995, and
declined as a percentage of net service revenue to 26.9% from 28.4%. Selling,
general and administrative costs are relatively fixed in the near term and
generally will increase at a lower rate than net revenue. The two largest
components of selling, general and administrative costs are labor (executive,
business development, finance and administration) and rent. Labor costs
increased 33.6% to $1.6 million in the first quarter of 1996 from $1.2 million
in the same period of 1995, but decreased as a percentage of net service revenue
to 9.3% from 10.5%. Rent expense increased 32.3% to $815,000 in the first
quarter of 1996 from $616,000 in the same period of 1995, but decreased as a
percentage of net service revenue to 4.6% from 5.2%.
 
     Depreciation and amortization expense increased 32.8% to $700,000 in the
first quarter of 1996 compared to $527,000 in the same period of 1995.
 
     Interest income, net of interest expense, decreased to $201,000 in the
first quarter of 1996 from $203,000 in the same period of 1995.
 
     Consolidated income before income taxes increased $671,000 to $1.9 million
in the first quarter of 1996 which included a six thousand dollar loss from
foreign operations compared to consolidated income before income taxes of $1.2
million in the same period of 1995 which included a $34,000 loss from foreign
operations. The provision for income taxes was $782,000 in the first quarter of
1996 as compared to $503,000 in the same period of 1995 resulting in effective
tax rates of 41.3% for 1996 and 41.1% for 1995. The significant items that
create the difference between the Company's federal statutory and effective tax
rates are foreign net operating losses unrecognized for U.S. tax purposes,
nondeductible amortization of goodwill, timing differences created by
depreciation, state and local income taxes, tax-exempt interest income and
certain other accrued expenses. The Company will not be able to record a tax
asset for losses incurred in its foreign operations until such time, if any,
that it has three years of profits in the applicable jurisdiction. However, the
Company will be able to recognize a tax benefit for losses incurred in its
foreign operations as the subsidiary generates taxable income to the extent of
the cumulative losses.
 
  Year Ended December 31, 1995 Compared to Year Ended December 31, 1994
 
     Net service revenue increased 34.9% to $57.8 million in 1995 from $42.9
million in 1994. This increase resulted primarily from an increase in the number
of contracts under management and in the size of such contracts. The backlog at
December 31, 1995 was $90.2 million, representing 152 contracts from 43 clients,
as compared to $71.1 million at December 31, 1994, representing 137 contracts
from 45 clients.
 
     Direct costs increased 37.6% to $34.9 million in 1995 from $25.3 million in
1994, and increased as a percentage of net service revenue to 60.2% from 59.1%.
Direct costs, as a percentage of net revenue, may fluctuate from one period to
the next based on the mix of contracts in the backlog as of any given date. In
addition, direct costs may fluctuate due to changes in labor utilization
resulting from the growth the Company has experienced.
 
     Selling, general and administrative expenses increased 25.6% to $15.2
million in 1995 from $12.1 million in 1994, but declined as a percentage of net
service revenue to 26.3% from 28.2%. Selling, general and administrative costs
are relatively fixed in the near term and generally will increase at a lower
rate than net revenue. The two largest components of selling, general and
administrative costs are labor (executive, business development, finance and
administration) and rent. Labor costs increased 15.3% to $5.3 million in 1995
from $4.6 million in 1994, but decreased as a percentage of net service revenue
to 9.2% from 10.8%. Rent expense increased 22.7% to $2.7 million in 1995 from
$2.2 million in 1994, but decreased as a percentage of net service revenue to
4.6% from 5.0%. Additional office space was leased during the year for new
employees hired to support the increase in level of operations.
 
                                       17
<PAGE>   18
 
     Depreciation and amortization expense increased 18.1% to $2.3 million in
1995 compared to $1.9 million in 1994.
 
     Interest income, net of interest expense, increased 33.8% to $665,000 in
1995 from $497,000 in 1994.
 
     Consolidated income before income taxes increased $2.2 million to $6.2
million in 1995 which included $59,000 income from foreign operations compared
to consolidated income before income taxes of $4.0 million in 1994 which
included a $443,000 loss from foreign operations. The provision for income taxes
was $2.6 million in 1995 as compared to $1.8 million in 1994 resulting in
effective tax rates of 42% and 46%, respectively. The decrease in the effective
tax rate in 1995 is due primarily to decreased operating losses in Europe. The
significant items which create the difference between the Company's federal
statutory and effective tax rates are foreign net operating losses unrecognized
for U.S. tax purposes, non-deductible amortization of goodwill, timing
differences created by depreciation, state and local income taxes, tax-exempt
interest income and certain other accrued expenses. The Company will not be able
to record a tax asset for losses incurred in its foreign operations until such
time, if any, that it has three years of profits in the applicable jurisdiction.
However, the Company will be able to recognize a tax benefit for losses incurred
in its foreign operations as the subsidiary generates taxable income to the
extent of the cumulative losses.
 
  Year Ended December 31, 1994 Compared to Year Ended December 31, 1993
 
     Net service revenue increased 21.5% to $42.9 million in 1994 from $35.3
million in 1993. This increase resulted primarily from an increase in the number
of clients and a corresponding increase in the number of contracts under
management and in the size of such contracts. The backlog at December 31, 1994,
was $71.1 million, representing 137 contracts from 45 clients, as compared to
$47.3 million at December 31, 1993, representing 94 contracts from 36 clients.
 
     Direct costs increased 19.9% to $25.3 million in 1994 from $21.1 million in
1993, but declined as a percentage of net service revenue to 59.1% from 59.9%.
The improvement in direct costs as a percentage of net revenue resulted from a
larger number of contracts under management, increased profitability on
contracts under management, and a significant improvement in labor utilization.
 
     Selling, general and administrative costs increased 18.3% to $12.1 million
in 1994 from $10.2 million in 1993, but declined as a percentage of net service
revenue to 28.2% from 29.0%. Labor costs increased 20.6% to $4.6 million in 1994
from $3.8 million in 1993, but decreased as a percentage of net service revenue
to 10.8% from 10.9%. Rent expense increased 29.8% to $2.2 million in 1994 from
$1.7 million in 1993, and increased as a percentage of net service revenue to
5.0% from 4.7%. Additional office space was leased during the year for new
employees hired to support the increase in level of operations.
 
     Depreciation and amortization expense increased to $1.9 million in 1994
compared to $1.7 million in 1993.
 
     Interest income increased 170.1% to $597,000 in 1994 from $221,000 in 1993
as a result of a larger average cash balance and higher interest rates during
1994.
 
     Interest expense decreased 79.0% to $100,000 in 1994 from $476,000 in 1993.
The Company repaid virtually all of the outstanding principal on its Credit
Facility (as defined below in "Liquidity and Capital Resources") at the end of
1993 using a portion of the proceeds from its November 1993 initial public
offering. Interest expense in 1994 primarily consisted of a commitment fee
(3/8%) paid on the unused portion of its Credit Facility.
 
     Consolidated income before income taxes totaled $4.0 million in 1994, which
included a $443,000 loss from foreign operations, compared to consolidated
income before income taxes of $2.0 million in 1993, which included a loss of
$808,000 from foreign operations. The provision for income taxes was $1.8
million in 1994 as compared to $1.2 million in 1993 resulting in effective tax
rates of 46% and 60%, respectively. The significant items which create the
difference between the Company's federal statutory and effective tax rates are
foreign net operating losses unrecognized for U.S. tax purposes, non-deductible
amortization of goodwill, timing differences created by depreciation, state and
local income taxes and certain other accrued expenses. The
 
                                       18
<PAGE>   19
 
Company will not be able to record a tax asset for losses incurred in its
foreign operations until such time, if any, that it has three years of profits
in the applicable jurisdiction. However, the Company will be able to recognize a
tax benefit for losses incurred in its foreign operations as the subsidiary
generates taxable income to the extent of the cumulative losses.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     The CRO industry is generally not capital intensive. The Company's primary
cash needs on both a short-term and long-term basis are the payment of salaries,
office rent and the travel expenditures of its employees. The Company has
historically financed these expenditures, as well as acquisitions, with cash
flow from operations, issuances of equity securities and borrowings under its
Credit Facility as defined below. The Company utilizes its working capital to
finance these expenditures pending receipt of its receivables. Contract payments
by the Company's clients vary according to the terms of each contract. Capital
expenditures have primarily been made for computer system additions and upgrades
and computer equipment for new employees. Capital expenditures were $2.0 million
in 1994 and $3.8 million in 1995 and are anticipated to be approximately $8 to
$10 million in 1996, which includes anticipated capital expenditures by
Bio-Research.
 
     The Company's contracts usually require a portion of the contract amount to
be paid at or near the time the trial is initiated. Payments are generally made
upon the completion of negotiated performance requirements and, to a lesser
extent, on a date certain basis throughout the life of the contract. The Company
has experienced a trend, which it expects will continue, in which clients place
less emphasis on prepayments and greater emphasis on negotiated performance
requirements. This is likely to increase days sales outstanding in accounts
receivable. However, the Company does not expect this trend to have a
significant impact on its ability to maintain its overall working capital. Cash
receipts do not correspond to costs incurred and revenue recognition (which is
based on cost-to-cost type of percentage of completion accounting). Therefore,
the Company's cash flow is influenced by the interaction of changes in
receivables and advance billings. The Company typically receives a low volume of
large-dollar cash receipts. Historically, the Company has received significant
cash receipts from its clients in the fourth quarter. As a result, the number of
days revenue outstanding in accounts receivable will fluctuate due to the timing
and size of cash receipts, particularly in the fourth quarter. The number of
days revenue outstanding in accounts receivable was 77 days at March 31, 1996
and 76 days at March 31, 1995. The number of days revenue outstanding in
accounts receivable net of advanced billings was 6 days at March 31, 1996 and 21
days at March 31, 1995.
 
     During the three months ended March 31, 1996, net cash provided by
operating activities totalled $1.0 million primarily due to net income, net of
non-cash expenses, of $1.8 million, an increase in advanced billings of $1.2
million, and a decrease in advance payments to investigators of $1.1 million
which were partially offset by an increase in accounts receivable of $3.2
million.
 
     Cash used in investing activities of $1.3 million during the three months
ended March 31, 1996 consisted principally of capital expenditures. Cash
provided by financing activities of $80,000 for the same period resulted
principally from the issuance of common stock.
 
     The Company had cash, cash equivalents and held-to-maturity securities of
$16.8 million at March 31, 1996 as compared to $18.7 million at March 31, 1995.
 
     The Company's Credit Facility consists of a $10.0 million line of credit to
be used for working capital and acquisition purposes at the Company's discretion
(the "Credit Facility"). Interest on any outstanding portion of the Credit
Facility is at the bank's prime lending rate (8.25% at March 31, 1996) or LIBOR
plus 200 basis points at the Company's option. The Company pays a fee of 0.25%
(annualized) of the unused portion of the available borrowings. The fee is
payable quarterly. The Company had no principal borrowings outstanding under the
Credit Facility as of March 31, 1996. The Credit Facility is collateralized by
the Company's assets and by a pledge of the capital stock of its subsidiaries.
The Credit Facility contains certain financial and operational covenants
including minimum levels for stockholders' equity, working capital, and fixed
charge coverage ratios. The Credit Facility also limits the amount of capital
expenditures, sale of any shares of capital stock, incurrence of indebtedness or
liens, investments and guarantees, and prohibits the declaration or payment of
dividends.
 
                                       19
<PAGE>   20
 
     The Company expects to continue expanding its operations through internal
growth and strategic acquisitions. The Company expects the Acquisition and other
such activities will be funded from the proceeds of the Offering, existing cash,
cash equivalents, held-to-maturity securities, cash flow from operations, and
available borrowings under its Credit Facility. The Company estimates that such
sources of cash will be sufficient to fund the Company's current operations,
including expansions of its foreign operations, at least through 1997. Although
the Company has no present acquisition agreements or arrangements other than the
Acquisition, there may be acquisition or other growth opportunities which
require additional external financing, and the Company may from time to time
seek to obtain additional funds from public or private issuances of equity or
debt securities. There can be no assurances that such financings will be
available on terms acceptable to the Company.
 
PENDING BIO-RESEARCH ACQUISITION
 
     Bio-Research Selected Historical Financial Statements.  The following
selected financial data for the three years ended December 31, 1995 are derived
from the audited financial statements of Bio-Research, which have been audited
by Ernst & Young LLP, independent auditors. The financial data for the three-
month periods ended March 31, 1996 and 1995 are derived from unaudited financial
statements. The unaudited financial statements include all adjustments,
consisting of normal recurring accruals, which Bio-Research considers necessary
for a fair presentation of the financial position and the results of operations
for these periods. Operating results for the three months ended March 31, 1996
are not necessarily indicative of the results that may be expected for the
entire year ending December 31, 1996. The data should be read in conjunction
with the financial statements of Bio-Research, related notes, and other
financial information included herein and the discussion of the results of
operations following such data.
 
<TABLE>
<CAPTION>
                                                                                   THREE MONTHS
                                                                                       ENDED
                                                   YEAR ENDED DECEMBER 31,           MARCH 31,
                                                 ---------------------------     -----------------
                                                  1993      1994      1995        1995      1996
                                                 -------   -------   -------     -------   -------
                                                                  (IN THOUSANDS)
<S>                                              <C>       <C>       <C>         <C>       <C>
STATEMENTS OF INCOME DATA:
Service revenue................................  $22,418   $24,504   $26,342     $ 7,379   $ 6,324
Operating costs and expenses:
  Direct costs.................................   12,942    13,184    14,408       3,536     3,658
  Selling, general and administrative
     expenses..................................    7,176     7,804     8,024       2,135     1,954
  Depreciation.................................    1,141     1,347     1,573         437       426
                                                 -------   -------   -------     -------   -------
Income from operations.........................    1,159     2,169     2,337       1,271       286
Other income...................................      132       180       363         106        76
                                                 -------   -------   -------     -------   -------
Income before income taxes.....................    1,291     2,349     2,700       1,377       362
Provision for income taxes.....................   (1,117)   (1,100)   (1,026)       (202)     (176)
                                                 -------   -------   -------     -------   -------
Net income.....................................  $ 2,408   $ 3,449   $ 3,726     $ 1,579   $   538
                                                 =======   =======   =======     =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                     AS OF DECEMBER 31,           AS OF MARCH 31,
                                                 ---------------------------     -----------------
                                                  1993      1994      1995        1995      1996
                                                 -------   -------   -------     -------   -------
<S>                                              <C>       <C>       <C>         <C>       <C>
BALANCE SHEET DATA:
Cash and cash equivalents......................  $ 4,120   $ 4,172   $ 5,699     $ 5,234   $ 5,548
Working capital................................    7,682     8,663     9,171      10,676     9,833
Total assets...................................   28,933    31,425    33,081      31,649    32,014
Long-term debt.................................       --        --        --          --        --
Stockholders' equity...........................   23,128    25,207    26,143      26,840    26,633
</TABLE>
 
                                       20
<PAGE>   21
 
  Bio-Research's Results of Operations
 
     Founded in 1965, Bio-Research is a leading preclinical CRO providing
services to clients in the pharmaceutical, biotechnology, chemical and medical
device industries. Bio-Research designs and conducts preclinical trials, based
principally on animal models, that produce the data required to assess and
evaluate efficacy in and potential risks to humans.
 
     Service revenue is generated from preclinical studies, which may be
short-term projects designed to assess acute toxicity, mid-term projects
designed to assess the feasibility of testing a compound on humans or long-term
projects designed to determine the possible effects of prolonged administration
in humans.
 
     Mid-term and long-term projects typically generate higher service revenue
and operating margins than short-term projects as a result of their more
technical nature, increased demand for laboratory services and higher level of
labor and facility utilization. Long-term projects generally produce slightly
lower margins than mid-term projects, but have the advantage of a more
consistent revenue stream over a longer period of time, thereby allowing for
more effective planning and resource utilization.
 
  Quarter Ended March 31, 1996 Compared to Quarter Ended March 31, 1995
 
     Service revenue decreased 14.3% to $6.3 million in the first quarter of
1996 from $7.4 million in the same period of 1995. During the 1995 period,
Bio-Research conducted an atypically high number of mid-term projects, resulting
in higher than normal service revenue and operating margins. Bio-Research
performed services for 76 clients representing 200 contracts during the first
quarter of 1996, and for 79 clients representing 206 contracts during the first
quarter of 1995. Backlog was $20.6 million at March 31, 1996 and $14.5 million
at March 31, 1995.
 
     Direct costs increased 3.5% to $3.7 million in the first quarter of 1996
from $3.5 million in the same period of 1995, and increased as a percentage of
service revenue to 57.8% from 47.9%. This increase in direct costs as a
percentage of service revenue is a result of the atypically high number of
mid-term projects in Bio-Research's study mix in the 1995 period. Mid-term
projects require a wider range of services, including clinical laboratory
services, resulting in high levels of labor and facility utilization, and thus,
lower direct costs as a percentage of service revenue.
 
     Selling, general and administrative costs decreased 8.5% to $2.0 million in
the first quarter of 1996 from $2.1 million in the same period of 1995, but
increased as a percentage of service revenue to 30.9% from 28.9%. Selling,
general and administrative expenses are relatively fixed in the near term and
will generally increase at a lower rate than service revenue. The two largest
components of selling, general and administrative expenses are labor and
facility operation and maintenance. Labor costs decreased to $826,000 in the
first quarter of 1996 from $862,000 in the first quarter of 1995, and increased
as a percentage of revenue to 13.1% from 11.7%. Facility costs decreased to
$360,000 in the first quarter of 1996 from $391,000 in the first quarter of
1995, and increased as a percentage of service revenue to 5.7% from 5.3%.
 
     Income before income taxes decreased $1.0 million to $362,000 in the first
quarter of 1996 compared to the same period in 1995. The provision for income
taxes, net of various research and development related tax credits, was a
benefit of $176,000 in the first quarter of 1996 and a benefit of $202,000 in
the first quarter of 1995, resulting in effective tax rates of negative 48.6%
and negative 14.7%, respectively. The amount of these tax credits are dependent
on several factors and will not necessarily vary directly with the profitability
of Bio-Research.
 
                                       21
<PAGE>   22
 
  Year Ended December 31, 1995 Compared to Year Ended December 31, 1994
 
     Service revenue increased by 7.5% to $26.3 million in 1995 from $24.5
million in 1994, primarily due to an increase in the number of contracts under
management. In 1995, Bio-Research performed services for 121 clients
representing 420 contracts as compared to 113 clients representing 391 contracts
in 1994. The backlog at December 31, 1995 was $18.0 million and $18.2 million at
December 31, 1994.
 
     Direct costs increased 9.3% to $14.4 million in 1995 from $13.2 million in
1994, and increased as a percentage of service revenue to 54.7% from 53.8%.
Direct costs, as a percentage of net revenue, may fluctuate based on the mix of
projects which can impact labor and facility utilization.
 
     Selling, general and administrative cost increased 2.8% to $8.0 million in
1995 from $7.8 million in 1994 representing a decrease as a percentage of
service revenue to 30.5% from 31.8%. Labor costs increased 12.3% to $3.3 million
in 1995 from $2.9 million in 1994, and increased as a percentage of service
revenue to 12.6% from 12.1%. Facility costs remained level at $1.5 million and
decreased as a percentage of service revenue to 5.4% from 6.0%.
 
     Income before income taxes increased $351,000 to $2.7 million in 1995 from
$2.3 million in 1994. The provision for income taxes, net of research and
development related tax credits, was a benefit of $1.0 million in 1995 and $1.1
million in 1994 resulting in effective tax rates of negative 38.0% and negative
46.8%, respectively. The amount of these tax credits is dependent on several
factors and will not necessarily vary directly with the profitability of
Bio-Research.
 
  Year Ended December 31, 1994 Compared to Year Ended December 31, 1993
 
     Service revenue increased 9.3% to $24.5 million in 1994 from $22.4 million
in 1993. Bio-Research performed services for 113 clients representing 391
contracts during 1994 as compared to 99 clients representing 422 contracts in
1993. The backlog was $18.2 million at December 31, 1994 and $12.0 million at
December 31, 1993.
 
     Direct costs increased 1.9% to $13.2 million in 1994 from $12.9 million in
1993 but decreased as a percentage of service revenue to 53.8% from 57.7%.
Direct costs, as a percentage of net revenue, may fluctuate based on study mix
which can impact labor and facility utilization.
 
     Selling, general and administrative expenses increased 8.8% to $7.8 million
in 1994 from $7.2 million in 1993 but decreased slightly as a percentage of
service revenue to 31.8% from 32.0%. The increase in 1994 was due primarily to
increased investment in business development activities.
 
     Income before income taxes increased $1.0 million to $2.3 million from $1.3
million in 1993. The provision for income taxes, net of research and development
related tax credits, was a benefit of $1.1 million in both 1994 and 1993,
resulting in effective tax rates of negative 46.8% and negative 86.5%,
respectively. The amount of these tax credits is dependent on several factors
and will not necessarily vary directly with the profitability of Bio-Research.
 
                                       22
<PAGE>   23
 
                                    BUSINESS
 
GENERAL
 
     The Company is a leading CRO providing a full range of services to the
pharmaceutical, biotechnology and medical device industries. The Company
designs, monitors and manages clinical trials, provides clinical data management
and biostatistical services, and offers product registration services throughout
the United States and Europe. The Company generates substantially all of its
revenue from the clinical testing of new pharmaceutical and biotechnology
products. At March 31, 1996, the Company had contracts in backlog to perform
clinical research services in 26 countries worldwide. In 1995, the Company
performed services for 69 clients. Currently, ClinTrials has a client base of
100 pharmaceutical and biotechnology companies, including the ten largest
pharmaceutical companies in the world.
 
     In recent years pharmaceutical companies have begun to outsource clinical
trials management to CROs, which has resulted in significant growth in the CRO
industry. The Company believes that certain industry trends will continue to
increase the need for pharmaceutical and biotechnology companies to outsource
the management of their clinical trials. These trends include: (i) the desire of
many pharmaceutical companies to respond to cost containment pressures and
reduce the high fixed costs associated with peak-load staffing for drug
development by relying on a combination of internal resources and CROs; (ii) the
attempt by pharmaceutical and biotechnology companies to globalize clinical
research and development to maximize profits from a given drug by pursuing
regulatory approvals in multiple countries simultaneously by outsourcing to CROs
with global capabilities; (iii) the efforts by pharmaceutical and biotechnology
companies to confront the increasingly complex and strict regulatory
requirements in many jurisdictions by taking advantage of the data management
expertise, technological capabilities and global presence of CROs; (iv) the
escalation of worldwide research and development expenditures for new drugs,
including amounts spent on services of the type provided by CROs, resulting from
pressures to develop new drugs for the treatment of chronic disorders and life
threatening diseases; (v) the desire by pharmaceutical companies to reduce the
time required to develop and bring a new drug to the market by outsourcing
preclinical and clinical trials to CROs that provide a full range of services;
(vi) the efforts by pharmaceutical companies to reserve their internal resources
for the development of new drugs by using CROs to manage and conduct preclinical
and clinical trials; and (vii) the growth of the biotechnology industry and the
resulting increase in the demand for expertise and services provided by outside
sources, including CROs.
 
     The Company has offices in Nashville, Tennessee; Research Triangle Park,
North Carolina; Lexington, Kentucky; Maidenhead, England; Brussels, Belgium;
Melbourne, Australia; Jerusalem, Israel; and Santiago, Chile. Upon closing the
Acquisition, the Company will have laboratory facilities and office space in
Senneville, a suburb of Montreal, Quebec.
 
INDUSTRY BACKGROUND
 
     New pharmaceutical and biotechnology products must undergo extensive
testing and regulatory review to determine their safety and effectiveness.
Companies seeking approval for these products are responsible for performing and
analyzing the results of preclinical and multi-phase clinical trials.
Preclinical trials typically last for up to three years and involve animal
testing. Clinical trials typically last eight to twelve years and involve
hundreds or thousands of human subjects. Preclinical and clinical trials were
historically performed almost exclusively by in-house personnel at the major
pharmaceutical companies. In recent years, pharmaceutical companies have begun
to outsource clinical trials management to CROs, which has resulted in
significant growth in the CRO industry. The Company believes worldwide research
and development expenditures by the pharmaceutical and biotechnology industries
reached $30 billion in 1994, approximately $10 billion of which was spent on
clinical trials, with approximately $2 billion being outsourced to CROs. The
Company believes that an additional $1 billion of preclinical trial work was
outsourced to CROs in 1994.
 
     The CRO industry is still characterized by high fragmentation, with 600 to
700 companies worldwide. While historically the CRO industry has had low
barriers to entry, the number of entrants has decreased as pharmaceutical and
biotechnology sponsors require that entrants have a wide range of specialized
skills. The
 
                                       23
<PAGE>   24
 
Company believes that pharmaceutical and biotechnology companies are seeking
CROs that are able to provide a full range of services for a particular trial,
including the design, placement, performance and management of preclinical or
clinical trial programs. The Company believes that there are no more than 20
CROs capable of providing a full range of services, and even fewer able to
provide full service on an international basis. The Company performs Phase I,
II, III and IV services, and following the acquisition of Bio-Research will
perform preclinical services. The Company believes that there are only two other
CROs that currently provide the full range of services for preclinical and Phase
I through Phase IV trials. Management believes that consolidation in the CRO
industry is likely to continue as companies pursue various strategies to align
their capabilities with the continuing growth and demand for services.
 
INDUSTRY TRENDS
 
     The contract research industry derives substantially all of its revenue
from the research and development ("R&D") expenditures of pharmaceutical,
biotechnology and medical device companies. The Company believes that certain
industry trends have led pharmaceutical and biotechnology companies to increase
the use of CROs for preclinical and clinical trials. These trends include the
following:
 
     Increasing Cost Containment Pressures.  The increasing pressure to control
rising health care costs, and the penetration of managed health care and health
care reform have caused the following changes in the pharmaceutical industry:
 
     - Managed Care Organizations.  Managed care organizations have become major
      participants in the delivery of pharmaceuticals. These organizations limit
      the selection of drugs from which affiliated physicians may prescribe,
      thus increasing the competition among pharmaceutical companies to develop
      more effective products in a shorter time frame.
 
     - Consolidation.  As pharmaceutical companies seek to create economies of
      scale, there have been several large mergers within the pharmaceutical
      industry, and as a result of these mergers, the pharmaceutical industry
      has experienced large scale employee lay-offs and other cutbacks.
 
     - Other Factors.  Factors such as competition from generic drugs following
      patent expiration, more stringent regulatory requirements and the
      increasing complexity of clinical trials have resulted in increasing
      market pressure on profit margins.
 
     In response to these cost containment pressures, a number of United States
pharmaceutical companies have publicly committed to hold net effective price
increases generally in line with inflation. In the area of clinical development,
many pharmaceutical and biotechnology companies are seeking to reduce the high
fixed costs associated with peak-load staffing by reducing internal clinical
staff and relying on a combination of internal resources and external resources
such as CROs, thereby shifting fixed costs to variable costs.
 
     Globalization of Clinical Research and Development.  Due to the increasing
cost of new drug development, many projects that are not expected to achieve
sufficient annual worldwide revenue are abandoned. Pharmaceutical companies are
increasingly attempting to maximize returns from a given drug by pursuing
regulatory approvals in multiple countries simultaneously rather than
sequentially. A pharmaceutical company seeking approval in a country in which it
lacks experience or internal resources will frequently turn to a CRO for
assistance in interacting with regulators or in organizing and conducting
clinical trials. The Company believes that the globalization of clinical
research and development activities has increased the demand for CRO services.
 
     Increasingly Complex and Stringent Regulation; Need for Technological
Capabilities.  Increasingly complex and stringent regulatory requirements
throughout the world have increased the volume of data required for regulatory
filings and escalated the demand for data collection and analysis during the
drug development process. In addition, over the last ten years the average
number of clinical trials per new drug application has approximately doubled,
and the average number of patients participating in those trials has increased
approximately 25%. In recent years, the FDA and corresponding regulatory
agencies of Canada, Japan and the EC have commenced discussions to develop
common standards for preclinical and clinical
 
                                       24
<PAGE>   25
 
studies and the format and content of applications for new drug approvals.
Further, the FDA encourages the use of computer-assisted filings in an effort to
expedite the approval process. As regulatory requirements have become more
complex, the pharmaceutical and biotechnology industries are increasingly
outsourcing to CROs to take advantage of their data management expertise,
technological capabilities and global presence.
 
     Escalating Research and Development Expenditures.  Research and development
expenditures in 1994 for the top 50 pharmaceutical companies in the world (as
measured by such expenditures) increased approximately 11.8% from the previous
year. Such expenditures have resulted from an increased emphasis on developing
effective products for the treatment of chronic disorders and life threatening
acute conditions such as infectious diseases. The cost of developing therapies
for chronic disorders, such as arthritis, Alzheimer's disease and osteoporosis
is higher because the treatments must be studied for a longer period to
demonstrate their effectiveness in curbing the chronic disorder and to determine
any possible long-term side effects.
 
     Reducing Drug Development Time Requirements.  Pharmaceutical and
biotechnology companies face increased pressure to bring new drugs to market in
the shortest possible time, thereby reducing costs, maintaining market share and
accelerating realization of revenue. Currently, successful development of a new
drug takes approximately eight to twelve years, a significant portion of a
drug's seventeen-year period for protection under United States patent laws.
Certain clients of the Company have expressed a desire to reduce this time to
approximately five to seven years. Pharmaceutical and biotechnology companies
are attempting to increase the speed of new product development, and thereby
maximize the period of marketing exclusivity and economic returns for their
products, by outsourcing development activities to CROs. The Company believes
that CROs are often able to perform the needed services with a higher level of
expertise or specialization, and more quickly, than a pharmaceutical or
biotechnology company could perform such services internally. In addition, some
pharmaceutical and biotechnology companies are beginning to contract with large
full-service CROs to conduct preclinical and all phases of clinical trials for
new product programs lasting several years, rather than separately contracting
specific phases of drug development to several different CROs. The Company
believes this approach may result in shorter overall development times. In
anticipation of this trend, the Company seeks through the Bio-Research
acquisition to establish itself as a firm capable of taking a pharmaceutical
from its initial testing through its licensing for commercialization.
 
     New Drug Development Pressures.  The Company believes that R&D expenditures
have increased as a result of the constant pressure to develop and patent
products, and to respond to the demand for products for an aging population and
for the treatment of chronic disorders and life-threatening conditions. In
response to this pressure, pharmaceutical and biotechnology companies are
outsourcing preclinical and clinical trials in order to use their own resources
to develop additional drugs.
 
     Growth of Biotechnology Industry.  The biotechnology industry and the
number of drugs produced by it which require FDA approval have grown
substantially over the past decade. Many biotechnology companies have chosen not
to expend resources to develop sufficient staff or expertise to conduct clinical
trials in-house, but rather have utilized providers such as CROs to perform
these services.
 
     As the use of CROs increases, so do the demands placed upon CROs like
ClinTrials that provide a broad range of services in multiple countries for
larger clients. For example, larger CROs generally remain competitive by
sustaining internal growth and by opening offices in additional countries in
order to have a presence near either a client or a large test site.
Increasingly, large clients require CROs to meet certain credit-worthiness
standards. As a result of these factors, CROs such as ClinTrials have
experienced an increasing demand for working capital and strong balance sheets
in order to maintain their competitive standing within the industry.
 
BUSINESS STRATEGY
 
     The Company believes it is well positioned to take advantage of the
accelerating outsourcing trend as a result of its demonstrated ability to
provide a broad range of professional, cost-effective clinical research and
 
                                       25
<PAGE>   26
 
development services worldwide. The Company's strategy for capitalizing on the
expected growth in the CRO industry includes the following key components:
 
          Provide Comprehensive Preclinical and Clinical Research Services.  The
     Company offers a broad range of clinical research services and believes
     that its knowledge and experience in all stages of clinical research
     enhance its credibility with prospective clients. While the Company has in
     the past provided services primarily in Phase II, III and IV trials,
     Bio-Research has provided services primarily in preclinical trials. The
     combined capabilities of ClinTrials and Bio-Research will allow the Company
     to provide a broad range of preclinical and clinical services on a turnkey
     basis, which the Company believes can be especially important to clients
     without significant relevant regulatory expertise, such as biotechnology
     companies and international pharmaceutical companies seeking to enter new
     geographic markets. To meet the needs of specific clients, the Company
     offers its services separately or as an integrated package. This allows a
     client to use the Company to design a protocol, conduct a trial, analyze
     the results of one or more trials, prepare and submit a new drug
     application or computer-assisted filing to the FDA, or for any combination
     of these services. This approach enables the Company to respond to clients'
     requirements with flexibility and also allows it to establish a
     relationship with a new client with a particular service that may in turn
     lead to larger, more comprehensive projects. In addition, the Company
     believes that obtaining preclinical capabilities through the acquisition of
     Bio-Research will increase the prospect of being awarded contracts for
     later stage testing after satisfactory completion of the preclinical tests.
 
          Pursue Strategic Alliances.  In these arrangements, the client agrees
     to provide the Company with a minimum level of revenue and is guaranteed
     adequate staffing over a multi-year period. The Company believes this type
     of arrangement results in more predictable pricing to the client and more
     efficient management of the Company's resources, and potentially increases
     the amount of work outsourced to the Company by the strategic partner. In
     the past three years, the Company has entered into strategic alliances with
     Baxter Healthcare Corporation, Sandoz Pharmaceuticals Corporation and
     SmithKline Beecham Corporation. In addition, upon the acquisition of
     Bio-Research, the Company expects to become party to certain of
     Bio-Research's "preferred provider" relationships, which, in contrast to
     strategic alliances, are noncontractual, informal relationships in which
     the client makes the Company among its first choices of testing service
     providers.
 
          Expand International Presence.  The Company provides clinical research
     and development services to major United States and European pharmaceutical
     and biotechnology companies. The Company conducts multi-national clinical
     trials designed to pursue concurrent regulatory approvals in multiple
     countries. The Company believes that this experience is a competitive
     advantage, as pharmaceutical and biotechnology companies increasingly are
     pursuing regulatory approvals simultaneously in multiple countries. The
     Company has recently increased and strengthened its European management
     team and increased its office space in Maidenhead, England to provide more
     comprehensive services to its United States clients doing business abroad
     and to better market its services to existing and potential European
     clients. During 1995, the Company expanded its geographic reach by opening
     trials management offices in Australia, Israel and Chile, and now delivers
     services in 26 countries. In addition, Bio-Research has offices in Canada,
     and provides services to clients in Asia.
 
          Develop Capabilities in Emerging Areas.  The Company attempts to
     establish study protocols and expertise in a therapeutic area prior to the
     formal announcement of a new product by a pharmaceutical or biotechnology
     company. Manufacturers prefer to outsource to CROs that already have
     knowledge and have developed testing models in the relevant area and that
     can therefore more quickly begin the new drug application process. The
     Company learns of promising research and potential new products by
     attending conferences, reading scientific literature and by networking with
     industry experts, academics, manufacturers' representatives and others.
 
          Invest in Information Systems Technology.  The Company maintains a
     commitment to investment in technology with a focus on management
     information systems. The Company has invested heavily in improving its
     standard operating procedures, in continuous reengineering of the workflow
     processes and in the infrastructure required to support the creation,
     maintenance and statistical analysis of highly
 
                                       26
<PAGE>   27
 
     sophisticated databases. In particular, the Company has: (i) extended its
     wide area communications network to include all Company locations, enabling
     multi-national project teams to coordinate their activities on global,
     multi-site programs; (ii) supplemented its existing suite of clinical
     database tools with the implementation of industry-standard data management
     software; (iii) implemented new project tracking systems internationally as
     well as reengineered processes to reduce project set-up time; (iv)
     completed major investments in computer hardware, including processors and
     disk storage systems, which tripled its capacity to process study data; and
     (v) increased its management, biostatistics and information systems team to
     more than 300 employees, one of the largest such groups in the industry.
     The Company intends to continue to improve its management information
     systems with significant capital expenditures anticipated in 1996 and 1997.
 
          Broaden Therapeutic Expertise.  Prior working knowledge in specific
     therapeutic areas is a highly valued criterion by which many decisions to
     work with a CRO are made. ClinTrials has experience in a broad range of
     therapeutic areas and is continuing to expand its abilities and experience
     in more therapeutic areas. ClinTrials has demonstrated depth and high
     quality performance in the following areas: anti-viral infectious diseases,
     cardiology, central nervous system, gastroenterology, endocrinology,
     respiratory and urology. The Company is a leader in the investigation of
     blood substitutes and protease inhibitors and in the conducting of
     megatrials, trials involving more than 1,000 participants. The Company will
     further broaden its therapeutic expertise with the acquisition of
     Bio-Research, a leader in the areas of osteoporosis evaluation,
     cardiovascular pharmacology, biomaterials testing, bio-marker assays and
     infusion delivery.
 
          Increase Client Base and Number of Contracts.  ClinTrial's strategy is
     to seek contracts with new clients and new contracts with existing clients
     in different therapeutic areas. The Bio-Research acquisition will increase
     the Company's client base and will present the Company with the opportunity
     to cross-sell the services and related expertise of Bio-Research to the
     Company's existing clients, and the Company's clinical services and related
     expertise to Bio-Research's existing clients.
 
          Pursue Selected Acquisitions.  The Company plans to pursue strategic
     acquisitions of selected CROs or related businesses that provide one or
     more of the following: complementary services, expanded geographic
     presence, new therapeutic expertise or complementary client bases. The
     Bio-Research Acquisition exemplifies this aspect of the Company's strategy.
     Bio-Research provides an additional client base, including several clients
     in Asia and Europe, and provides new expertise in several therapeutic areas
     as well as the ability to perform preclinical services.
 
SERVICES
 
     The Company's current services and related products include clinical trials
management services, clinical data management and biostatistical services, and
product registration services. After acquiring Bio-Research, the Company will
also perform, manage and design preclinical trials and offer related services.
 
     Clinical Trials Management Services.  The Company offers complete services
for the design, placement, performance and management of clinical trial
programs, a critical element in obtaining regulatory approval for drugs and
medical devices. The Company has performed services in connection with trials in
many therapeutic areas. The Company's multi-disciplinary clinical trials group
has the ability to examine a product's existing preclinical and clinical data
for the purposes of designing protocols for clinical trials in order to
ascertain evidence of the product's safety and efficacy.
 
     The Company manages every aspect of trials in Phases I through IV,
including design of operations manuals, identification and recruitment of trial
investigators, initiation of sites, monitoring for strict adherence to GCP, site
visits to ensure compliance with protocol procedures and proper collection of
data, interpretation of trial results and report preparation. Substantially all
of the Company's current projects involve Phase II, III or IV clinical trials,
which, in most cases, are significantly larger and more complex than Phase I
trials. In addition, the acquisition of Bio-Research will immediately allow the
Company to provide preclinical and lab analysis services to its clients.
 
                                       27
<PAGE>   28
 
     A recent development in the CRO industry is the emergence of trials
involving tests on over 1,000 patients over a period of several years at
multiple sites. These trials have resulted from the drug companies' emphasis on
treating and curing chronic disorders and the resulting need to thoroughly test
large numbers of patients for long-term side effects of new drugs. The Company
is experienced in managing such trials and actively markets its abilities in
this area.
 
     Clinical trials are monitored for strict adherence to good clinical
practice. Efficient data collection, form design, detailed operations manuals
and site visits by the Company's clinical research associates ("CRA") are
employed to assist clinical investigators and their staffs in following
established protocols and accurately recording the findings of the trials.
 
     The Company assists clients with one or more of the following steps of
clinical trials:
 
     - Study Protocol.  The protocol defines the medical issues the study seeks
      to examine and the statistical tests that will be conducted. Accordingly,
      the protocol defines: (i) the type and frequency of laboratory and
      clinical measures that are to be tracked and analyzed; (ii) the number of
      patients required to produce a statistically valid result; (iii) the
      period of time over which they must be tracked; and (iv) the dosage and
      frequency of drug administration.
 
     - Case Report Forms.  Once the study protocol has been finalized, special
      forms for recording the desired information must be developed. These forms
      are called case report forms ("CRFs"). The CRF may change at different
      stages of a trial. The CRF for one patient in a given study may consist of
      as many as 100 pages or more.
 
     - Site and Investigator Recruitment.  The drug is administered to patients
      by investigators at hospitals, clinics or other locations, referred to as
      sites. Potential investigators may be identified by the drug sponsor or
      the CRO, which then solicits the investigators' participation in the
      study. Generally, the investigators contract directly with the Company.
      The trial's success depends on the successful identification and
      recruitment of investigators with proper expertise and an adequate base of
      patients who satisfy the requirements of the study protocol.
 
     - Patient Enrollment.  The investigators find and enroll patients suitable
      for the study according to the study protocol. Prospective patients are
      required to review information about the drug and its possible side
      effects and sign an informed consent to record their knowledge and
      acceptance of potential side effects. Patients also undergo a medical
      examination to determine whether they meet the requirements of the study
      protocol. Patients then receive the drug and are examined by the
      investigator as specified by the study protocol.
 
     - Study Monitoring and Data Collection.  As patients are examined and tests
      are conducted in accordance with the study protocol, data are recorded on
      CRFs and laboratory reports. The data are collected from study sites by
      specially trained CRAs. CRAs visit sites regularly to ensure that the CRFs
      are completed correctly and that all data specified in the protocol are
      collected. CRFs are reviewed for consistency and accuracy before their
      data are entered into an electronic database.
 
     - Medical Affairs.  Throughout the course of a clinical trial, the Company
      may provide various medical research and services including medical
      monitoring of clinical trials, interpretation of clinical trial results
      and preparation of clinical study reports.
 
     - Report Writing.  The results of statistical analysis of data collected
      during the trial together with other clinical data are included in a final
      report generated for inclusion in a regulatory document.
 
     Clinical Data Management and Biostatistical Services.  The Company's data
management professionals assist in the design of protocols and CRFs, as well as
training manuals and training sessions for investigational staff, to ensure that
data are collected in an organized and consistent format. Databases are designed
according to the analytical specifications of the project and the particular
needs of the client. Prior to data entry, the Company's personnel screen the
data to detect errors, omissions and other deficiencies in completed CRFs. The
Company provides clients with data abstraction, data review and coding, data
entry, database verification and editing, and problem data resolution.
 
                                       28
<PAGE>   29
 
     The Company's biostatistics professionals provide biostatistical
consulting, database design, data analysis and statistical reporting. The
Company's biostatisticians provide clients with assistance in all phases of drug
development. These professionals develop and review protocols, design
appropriate analysis plans and design report formats to address the objectives
of the study protocol as well as the client's individual objectives. Working
with the programming staff, biostatisticians perform appropriate analyses and
produce tables, graphs, listings and other applicable displays of results
according to the analysis plan. Frequently, biostatisticians assist clients
before panel hearings at the FDA.
 
     The Company believes that its data management and biostatistical services
capabilities can be utilized by a client more effectively when packaged as part
of its total clinical trials management services and used to monitor Phases I
through IV rather than just one phase. This packaging permits a faster and less
costly clinical trial process, as the data are collected and analyzed more
rapidly and the decision to move to the next phase can be made more quickly.
Although the Company believes that many pharmaceutical companies treat each
phase as a distinct trial, the Company is emphasizing its turnkey approach in
its marketing efforts. Currently, a significant portion of its services are
utilized by clients to process data that have previously been collected either
by the client itself or by another CRO as part of a distinct phase in the drug
development process. Several of the Company's clients from time to time request
that the Company develop the ability to monitor the entire drug testing process,
beginning with the preclinical phase. The acquisition of Bio-Research will allow
the Company to conduct preclinical testing and is a significant step in gaining
the ability to provide the entire range of services.
 
     Product Registration Services.  The Company provides comprehensive product
registration services throughout Europe and the Untied States. The Company
provides regulatory strategy formulation, document preparation, Good
Manufacturing Practice consultation and acts as liaison with the FDA and other
regulatory agencies. Although these services have not generated material revenue
to date, the Company offers these services in order to provide the full range of
services necessary to remain competitive in the CRO industry.
 
     The Company works closely with clients to devise regulatory strategies and
comprehensive product development programs. The Company's regulatory affairs
experts review existing published literature, assess the scientific background
of a product, assess the competitive and regulatory environment, identify
deficiencies and define the steps necessary to obtain registration in the most
expeditious manner. Through this service, the Company helps its clients
determine the feasibility of developing a particular product or product line.
 
     The Company's regulatory affairs professionals have experience in the
analysis, preparation and submission of FDA regulatory documents covering a wide
range of products, including drugs and over-the-counter products. The Company
also has experience with preparing regulatory documentation for submission to
European regulatory authorities.
 
PRECLINICAL TRIALS
 
     After the Acquisition, the Company will design and conduct preclinical
research programs, based principally upon animal models, that generate the data
required to establish safe starting dosages and the efficacy of a product in
humans, and to determine organ toxicity and other potential risks of human
usage. Preclinical trial reports are submitted to regulatory authorities in
support of an application to initiate clinical testing. The Company will also
offer analytical laboratory services including assessment of product
concentration in suspensions, solutions, animal feed and plasma radiometric
determination in metabolite profiling of biological tissues, and radiopurity
assessment of dose solution.
 
CLIENTS AND MARKETING
 
     The Company has served many of the leading pharmaceutical companies in the
United States and the EC. The Company's clients include the ten largest
pharmaceutical companies in the world. The Company's clients also include
companies in the biotechnology and medical device industries. For the year ended
December 31, 1995, the Company recognized revenue from contracts with 69
clients, and Bio-Research recognized revenue from contracts with approximately
120 clients. In 1995, the Company derived approximately 40% of its net service
revenue from clients who are also clients of Bio-Research. Therefore, the Bio-
 
                                       29
<PAGE>   30
 
Research acquisition will provide the Company the opportunity to cross-sell both
its services and Bio-Research's services to a significant number of new clients.
 
     During 1995, approximately 88% of the Company's net service revenue was
derived from pharmaceutical companies, 10% from biotechnology companies and 2%
from medical device companies. In 1995, pharmaceutical companies, biotechnology
companies and chemical companies contributed 54%, 35% and 7% of Bio-Research's
net service revenue, respectively.
 
     The Company has had, and will continue to have, certain clients from which
at least 10% of the Company's overall revenue is generated over multiple
contracts. Such concentrations of business are not uncommon within the CRO
industry. During 1995, the Company generated approximately 25% of its net
service revenue from Sandoz Pharmaceuticals Corporation and approximately 18%
from SmithKline Beecham Corporation. The Company's contracts are entered into
with numerous therapeutic areas or divisions within each client and frequently
involve different decision makers. Thus, there is a reduced likelihood that the
Company would simultaneously lose all contracts with any single client.
Accordingly, while the complete loss of a significant client could have a
material adverse effect on the Company, the termination of any one contract
would typically not have a material adverse effect.
 
     Marketing activities are conducted by the Company's business development
personnel based in each of the Company's locations. In response to the highly
technical nature of the Company's business, most business development personnel
have scientific backgrounds. Additionally, the Company runs an extensive
advertising program in trade journals and publications and, from time to time,
employs direct mailings of information to existing and potential clients. The
Company also attends and exhibits at selected trade shows in the United States
and Europe. The Company is in the process of expanding its business development
group in order to serve additional clients.
 
POTENTIAL LIABILITY AND INSURANCE
 
     The Company monitors the testing of new drugs on human volunteers pursuant
to study protocols in clinical trials. Clinical research involves a risk of
liability for personal injury or death to patients from adverse reactions to the
study drug, many of whom are seriously ill and are at great risk of further
illness or death as a result of factors other than their participation in a
trial. Additionally, although the Company's employees do not have direct contact
with the participants in a clinical trial, the Company, on behalf of its
clients, contracts with physicians who render professional services, including
the administration of the substance being tested, to such persons. As a result,
the Company could be held liable for bodily injury, death, pain and suffering,
loss of consortium, and other personal injury claims and medical expenses
arising from any professional malpractice of such physicians. The Company
maintains insurance to cover malpractice liability of physicians who are
employees or consultants of the Company. To date, the Company has not received
any claims resulting from either the testing of new drugs or professional
malpractice.
 
     The Company believes that the risk of liability to patients in clinical
trials is mitigated by various regulatory requirements, including the role of
institutional review boards ("IRBs") and the need to obtain each patient's
informed consent. The FDA requires each human clinical trial to be reviewed and
approved by the IRB at each study site. An IRB is an independent committee that
includes both medical and non-medical personnel and is obligated to protect the
interests of patients enrolled in the trial. After the trial begins, the IRB
monitors the protocol and the measures designed to protect patients, such as the
requirement to obtain informed consent.
 
     To reduce its potential liability, the Company seeks to obtain indemnity
provisions in its contracts with clients and, in some cases, with investigators
contracted by the Company on behalf of its clients. These indemnities generally
do not, however, protect the Company against certain of its own actions such as
those involving negligence or misconduct, or in some cases against the actions
or inactions of investigators. Moreover, these indemnities are contractual
arrangements that are subject to negotiation with individual clients, and the
terms and scope of such indemnities vary from client to client and from trial to
trial. The Company also, in some circumstances, indemnifies and holds harmless
its clients and investigators against liabilities incurred by such parties due
to the actions or inactions of the Company. Finally, since the financial
 
                                       30
<PAGE>   31
 
performance of these indemnities is not secured, the Company bears the risk that
an indemnifying party may not have the financial ability to fulfill its
indemnification obligations. The Company could be materially and adversely
affected if it were required to pay damages or incur defense costs in connection
with a claim that is outside the scope of an indemnity or where the indemnity,
although applicable, is not performed in accordance with its terms.
 
     The Company currently maintains an errors and omissions professional
liabilities insurance policy in amounts it believes to be sufficient. There can
be no assurance that this insurance coverage will be adequate, or that insurance
coverage will continue to be available on terms acceptable to the Company.
 
BACKLOG
 
     The Company previously has reported backlog as consisting of anticipated
net revenue from letters of intent and signed contracts that have not been
completed. Under this method, at December 31, 1995, backlog was approximately
$90.2 million, as compared to approximately $71.1 million at December 31, 1994.
 
     Because it has become more common for clients to authorize projects and the
Company to commence providing services before a contract is signed, the Company
believes reported backlog should consist of anticipated net revenue from
uncompleted projects which have been authorized by the client, through a written
contract or otherwise. Using the modified method of reporting backlog, at March
31, 1996, backlog was approximately $98.8 million, as compared to approximately
$71.8 million at March 31, 1995. The modification discussed would not have a
material effect on backlog as of any prior reporting period.
 
     Bio-Research calculates its backlog using the same method as ClinTrials. At
December 31, 1994, and 1995, Bio-Research had backlog of approximately $18.2
million and $18.0 million, respectively. At March 31, 1995, and 1996,
Bio-Research had backlog of approximately $14.5 million and $20.6 million,
respectively.
 
     The Company believes that backlog is not a consistent indicator of future
results because backlog can be affected by a number of factors, including the
variable size and duration of projects, many of which are performed over several
years. Additionally, projects may be terminated by the client or delayed by
regulatory authorities for many reasons, including unexpected test results.
Moreover, the scope of a project can change during the course of a study.
 
COMPETITION
 
     The Company and Bio-Research compete primarily against in-house research
departments of pharmaceutical companies, other CROs, universities and teaching
hospitals. The CRO industry is highly fragmented, with approximately 20
full-service CROs and many small, limited-service providers. In recent years,
several large, full-service competitors have emerged, some of which have
substantially greater capital and other resources, are better known and have
more experienced personnel than the Company. The Company's competitors include
Corning Pharmaceutical Services, a subsidiary of Corning, Inc.; Pharmaco, a
subsidiary of Applied Bioscience International, Inc.; Parexel International
Corp.; and Quintiles Transnational Corp. The recent trend toward industry
consolidation is likely to result in heightened competition among the larger
CROs. Although the financial costs of entry into the industry are relatively
low, the larger CROs are increasingly required to have substantial amounts of
working capital in order to sustain internal growth and international expansion,
and to meet the credit-worthiness standards of their larger clients. The Company
believes that clients choose a CRO based on several factors, the most important
of which is the quality of the work performed for existing clients. Other
important factors include references from existing clients, trials management
experience in and scientific knowledge of specific therapeutic areas, the price
for the services performed, the ability to organize and manage large-scale
trials on a global basis, the ability to manage large and complex medical data
bases, and the ability to hire and retain qualified investigators. The Company
believes that it competes favorably in these areas.
 
                                       31
<PAGE>   32
 
EMPLOYEES
 
     At March 31, 1996, the Company had 938 employees, of which 48 held Ph.D. or
M.D. degrees, and 106 others held masters degrees. Approximately 86% of the
Company's employees are located in the United States. The Company believes that
its relations with its employees are good.
 
     The Company's performance depends on its ability to attract and retain a
qualified management, professional, scientific and technical staff. Competition
from both the Company's clients and competitors for skilled personnel is high.
While the Company has not experienced any significant problems in attracting or
retaining qualified staff to date, there can be no assurance the Company will be
able to avoid these problems in the future.
 
LITIGATION
 
     The Company is from time to time subject to claims and suits arising in the
ordinary course of business. In the opinion of management, there are currently
no proceedings to which the Company is a party that will have a material adverse
effect upon its operations or financial condition.
 
     In 1991, a Bio-Research customer commenced legal action against
Bio-Research claiming damages in the amount of $5.2 million, plus interest and
costs, resulting from statistical errors in carrying out two clinical research
studies. Bio-Research has reserved $220,000 against this action in its financial
statements. ClinTrials has agreed to assume liability for this legal action in
connection with the Acquisition but does not believe that the outcome of this
litigation will have a material adverse impact upon its results of operations or
financial condition.
 
                                       32
<PAGE>   33
 
                                   MANAGEMENT
 
     The following table sets forth certain information concerning the executive
officers and directors of the Company:
 
<TABLE>
<CAPTION>
                     NAME                    AGE                  POSITION
    ---------------------------------------  ---   ---------------------------------------
    <S>                                      <C>   <C>
    William C. O'Neil, Jr..................  62    Chairman of the Board, President and
                                                     Chief Executive Officer
    Paul J. Ottaviano......................  49    Executive Vice President -- Worldwide
                                                     Operations
    Albert J. Siemens......................  52    Executive Vice President
    John W. Robbins........................  46    Chief Financial Officer and Secretary
    Barbara A. Cannon......................  44    Executive Vice President
    Joseph J. Colatuno.....................  44    Vice President and General Manager --
                                                     North America
    Thomas G. Cigarran.....................  54    Director
    Irwin B. Eskind, M.D...................  71    Director
    Richard J. Eskind......................  65    Director
    Edward G. Nelson.......................  65    Director
    Herbert J. Schulman, M.D...............  72    Director
</TABLE>
 
     William C. O'Neil, Jr. founded the Company in September 1989 and has been
the Chairman of the Board, President and Chief Executive Officer of the Company
since its organization. He served as President and Chief Executive Officer of
International Clinical Laboratories, Inc., a clinical laboratory testing
company, from 1977 until it was acquired in 1988 by SmithKline Beckman
Corporation. From January 1989 to May 1989, he served as President and Chief
Executive Officer of Biotherapeutics, Inc. (now known as Response Oncology,
Inc.) a cancer services company. Mr. O'Neil serves as a director of each of
ATRIX Laboratories, Inc., a drug delivery company; Sigma Aldrich Chemical
Company, a manufacturer of research chemicals; American Healthcorp, Inc., a
specialty health care service company; Advocat Inc., a long-term care company;
and Central Parking Corporation, a parking services company.
 
     Paul J. Ottaviano was promoted to Executive Vice President -- Worldwide
Operations in December 1995 after serving as Executive Vice President -- U.S.
Operations since July 1992. From May 1989 until joining the Company in July
1992, he was President and Chief Executive Officer of National
Psychopharmacology Laboratories, Inc., a specialty laboratory company. Mr.
Ottaviano was Chief Operating Officer of Med Inc. (later ImageAmerica, Inc.), a
medical imaging company, from April 1988 through May 1989. From July 1987 until
April 1988, Mr. Ottaviano was the Vice President -- Operations and President-ICL
East of International Clinical Laboratories, Inc. From January 1987 until July
1987, Mr. Ottaviano served as a Division President of International Clinical
Laboratories, Inc.
 
     Albert J. Siemens, Ph.D. has served as Executive Vice President within the
Business Development group of the Company since 1992 with additional
responsibilities for international development. Dr. Siemens served as President
of Clinical Research International, Inc., from 1986 through 1992. From 1983 to
1986 he was Vice President of Clinical Research for Family Health International,
a non-profit research foundation. Prior to that time, Dr. Siemens was associate
director of Clinical Research of Pfizer Laboratories, Inc.
 
     John W. Robbins has served as Chief Financial Officer, Vice President and
Secretary of the Company since November 1990. From June 1988 to October 1990, he
was Chief Financial Officer for the southeast region of McCaw Cellular
Communications, Inc., a cellular communications company. From October 1987 to
June 1988 he served as assistant to the Chief Financial Officer and as the
National Director of Accounts Receivable for International Clinical
Laboratories, Inc. Mr. Robbins is a Certified Public Accountant.
 
                                       33
<PAGE>   34
 
     Barbara A. Cannon has served as Executive Vice President within the
Business Development group of the Company since January 1993. From August 1990
to December 1992, Ms. Cannon served as Chief Operating Officer of the Company's
Nashville operations. From March 1990 until August 1990, Ms. Cannon was a
consultant to various pharmaceutical companies. From June 1987 until February
1990, she served as Vice President of the Institute of Clinical Pharmacology, a
CRO headquartered in Dublin, Ireland. Ms. Cannon was Director of Market Strategy
for Hospital Corporation of America from March 1986 through May 1987.
 
     Joseph J. Colatuno joined the Company in January 1994 as General
Manager -- North America. Mr. Colatuno is responsible for day-to-day operations
and management of the various functional groups in North America involved in the
clinical development of pharmaceutical and biotechnology products. Prior to
joining ClinTrials, Mr. Colatuno spent 20 years with the Upjohn Company.
 
     Thomas G. Cigarran has served as a director of the Company since February
1992. From September 1981 through August 1988, Mr. Cigarran served as President
and Chief Operating Officer of American Healthcorp, Inc. In September 1988, Mr.
Cigarran became the Chairman, President and Chief Executive Officer of American
Healthcorp, Inc.
 
     Irwin B. Eskind, M.D. has been a director of the Company since February
1992. Dr. Eskind was engaged in the private practice of internal medicine from
1954 until 1996. Dr. Eskind is the brother of Richard J. Eskind, also a director
of the Company.
 
     Richard J. Eskind has served as a director of the Company since February
1992. Mr. Eskind has served since October 1986 as Vice President-Investments of
A.G. Edwards & Sons, Inc., a broker-dealer firm. Mr. Eskind is the brother of
Irwin B. Eskind, M.D., also a director of the Company.
 
     Edward G. Nelson has been a director of the Company since November 1990.
Mr. Nelson formed Nelson Capital Corp., a merchant banking firm, in 1984, and
has served as the President and Chairman of the Board of such firm since its
organization. Mr. Nelson serves as a director of Osborn Communications Company,
an owner and operator of radio and television stations; Berlitz International,
Inc., a language services company; Central Parking Corporation, a parking
services company; and Advocat Inc., a long-term care company.
 
     Herbert J. Schulman, M.D. has been a director of the Company since February
1992. Dr. Schulman retired from the private practice of internal medicine in
1988.
 
                                       34
<PAGE>   35
 
                             PRINCIPAL STOCKHOLDERS
 
     The following table sets forth as of June 10, 1996, information with
respect to the beneficial ownership of the Company's outstanding Common Stock by
(i) each director of the Company, (ii) each of the Chief Executive Officer and
the four most highly compensated executive officers of the Company, (iii) all
directors and all executive officers of the Company as a group, and (iv) each
stockholder known by the Company to be the beneficial owner of more than 5% of
the Company's outstanding Common Stock. Except as otherwise indicated, the
persons or entities listed below have sole voting and investment power with
respect to all shares of Common Stock owned by them, except to the extent such
power may be shared with a spouse.
 
<TABLE>
<CAPTION>
                                                              SHARES                    SHARES
                                                        BENEFICIALLY OWNED        BENEFICIALLY OWNED
                                                      PRIOR TO THE OFFERING       AFTER THE OFFERING
                                                      ----------------------    ----------------------
                  NAME AND ADDRESS                     NUMBER     PERCENT(1)     NUMBER     PERCENT(1)
- ----------------------------------------------------  ---------   ----------    ---------   ----------
<S>                                                   <C>         <C>           <C>         <C>
Irwin B. Eskind, M.D.**.............................  1,142,672      12.8%      1,142,672       9.9%
  541 Jackson Blvd.
  Nashville, TN
Richard J. Eskind**.................................  1,139,755      12.8       1,139,755       9.9
  6000 Dunham Springs Road
  Nashville, TN
Herbert J. Schulman, M.D.**.........................    903,830      10.2         903,830       7.8
  109 Westhampton Place
  Nashville, TN
William C. O'Neil, Jr.(2)**.........................    821,311       9.0         821,311       7.0
  One Burton Hills Blvd.
  Suite 210
  Nashville, TN
Thomas G. Cigarran**................................     77,643        *           77,643        *
Edward G. Nelson(3)**...............................     52,474        *           52,474        *
Albert J. Siemens(4)................................     33,699        *           33,699        *
Paul J. Ottaviano(5)................................     17,499        *           17,499        *
Barbara A. Cannon...................................         --        *               --        *
John W. Robbins(6)..................................      7,500        *            7,500        *
All directors and executive officers as a group
  (eleven persons)(7)...............................  4,200,383      45.6%      4,200,383      35.5%
</TABLE>
 
- ---------------
 
  * Less than 1%
 ** Director
(1) Based on 8,905,134 shares of Common Stock outstanding prior to the Offering
     and 11,522,468 outstanding after the Offering, plus, as to each individual
     and group listed, the number of shares of Common Stock deemed to be owned
     by such holder pursuant to Rule 13d-3 under the Exchange Act, which
     includes shares subject to stock options held by such holder that are
     exercisable within 60 days of June 10, 1996.
(2) Includes 56,311 shares owned by Mr. O'Neil's wife. Mr. O'Neil disclaims
     beneficial ownership of these shares. Also includes 250,000 shares issuable
     upon the exercise of vested options.
(3) Includes 2,000 shares owned by Mr. Nelson's wife. Mr. Nelson disclaims
     beneficial ownership of such shares. Also includes 43,976 shares held by
     Nelson Capital Corp. and certain of its affiliates, beneficial ownership of
     which Mr. Nelson disclaims. Mr. Nelson is the principal stockholder and
     president of Nelson Capital Corp.
(4) Includes 26,250 shares issuable upon the exercise of vested options.
(5) Includes 17,499 shares issuable upon the exercise of vested options.
(6) Includes 7,500 shares issuable upon the exercise of vested options.
(7) Includes 305,249 shares issuable upon the exercise of vested options.
 
                                       35
<PAGE>   36
 
                                  UNDERWRITING
 
     Pursuant to the Underwriting Agreement and subject to the terms and
conditions thereof, the Underwriters named below, acting through J.C. Bradford &
Co., Piper Jaffray Inc. and Smith Barney Inc., as representatives of the several
underwriters (the "Representatives"), have agreed, severally, to purchase from
the Company, the number of shares of Common Stock set forth below opposite their
respective names.
 
<TABLE>
<CAPTION>
                                                                                    NUMBER OF
                               NAME OF UNDERWRITER                                   SHARES
- ----------------------------------------------------------------------------------  ---------
<S>                                                                                 <C>
J.C. Bradford & Co. ..............................................................    872,446
Piper Jaffray Inc. ...............................................................    872,444
Smith Barney Inc. ................................................................    872,444
                                                                                    ---------
          Total...................................................................  2,617,334
                                                                                     ========
</TABLE>
 
     In the Underwriting Agreement, the Underwriters have agreed, subject to the
terms and conditions therein set forth, to purchase all shares of Common Stock
offered hereby if any of such shares are purchased.
 
     The Company has been advised that the Underwriters propose initially to
offer the shares of Common Stock to the public at the public offering price set
forth on the cover page of this Prospectus and to certain dealers at such price
less a concession not in excess of $0.80 per share. The Underwriters may allow
and such dealers may reallow a concession not in excess of $0.10 per share to
certain other dealers. After the initial public offering, the public offering
price and such concessions may be changed by the Underwriters.
 
     The offering of the shares of Common Stock is made for delivery when, as
and if accepted by the Underwriters and subject to prior sale and to withdrawal,
cancellation or modification of the offer without notice. The Underwriters
reserve the right to reject any order for the purchase of the shares.
 
     The Company has granted to the Underwriters an option, exercisable not
later than 30 days from the date of this Prospectus, to purchase up to an
aggregate of 372,666 additional shares of Common Stock to cover over-allotments.
To the extent the Underwriters exercise this option, each of the Underwriters
will have a firm commitment to purchase approximately the same percentage
thereof which the number of shares of Common Stock to be purchased by it shown
in the table above bears to the total and the Company will be obligated,
pursuant to the option, to sell such shares to the Underwriters. The
Underwriters may exercise such option only to cover over-allotments made in
connection with the sale of shares of Common Stock offered hereby. If purchased,
the Underwriters will sell such additional shares on the same terms as those on
which the shares are being offered.
 
     In connection with the Offering, certain Underwriters may engage in passive
market making transactions in the Common Stock on the Nasdaq National Market
immediately prior to the commencement of sales in the Offering in accordance
with Rule 10b-6A under the Exchange Act. Passive market making consists of
displaying bids on the Nasdaq National Market limited by the bid prices of
independent market makers and purchases limited by such prices and effected in
response to order flow. Net purchases by a passive market maker on each day are
limited to a specified percentage of the passive market makers' average daily
trading volume in the Common Stock during a specified period and must be
discontinued when such limit is reached. Passive market making may stabilize the
market price of the Common Stock at a level above that which might otherwise
prevail and, if commenced, may be discontinued at any time.
 
     The offering of the shares of Common Stock is being made in accordance with
Rule 2720 of the Conduct Rules of the National Association of Securities
Dealers, Inc. ("NASD"), Distribution of Securities of NASD Members and
Affiliates -- Conflicts of Interest. A.G. Edwards & Sons, Inc., an NASD Member
("A.G. Edwards"), is deemed to be an affiliate of the Company as a result of the
relationship of Richard J. Eskind as a shareholder and director of the Company
and a Vice President -- Investments of A.G. Edwards.
 
     The Company, its executive officers and directors have agreed that they
will not, without the prior written consent of the Representatives, issue, sell,
transfer, assign or otherwise dispose of any shares of the Common Stock or
options, warrants, or rights to acquire Common Stock owned by them prior to the
expiration of 120 days from the date of this Prospectus.
 
                                       36
<PAGE>   37
 
     The Underwriting Agreement provides that the Company will indemnify the
Underwriters and controlling persons, if any, against certain liabilities,
including liabilities under the Securities Act, or will contribute to payments
which the Underwriters or any such controlling persons may be required to make
in respect thereof.
 
                                 LEGAL MATTERS
 
     The validity of the shares of the Common Stock offered hereby will be
passed upon for the Company by Harwell Howard Hyne Gabbert & Manner, P.C.,
Nashville, Tennessee. Certain legal matters relating to the sale of Common Stock
will be passed upon for the Underwriters by Bass, Berry & Sims PLC, Nashville,
Tennessee.
 
                                    EXPERTS
 
     The consolidated financial statements of the Company incorporated by
reference in the Company's Annual Report (Form 10-K) for the year ended December
31, 1995, have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon included therein and incorporated herein by
reference. Such consolidated financial statements are incorporated herein by
reference in reliance upon such report given upon the authority of such firm as
experts in accounting and auditing.
 
     The financial statements of Bio-Research at December 31, 1995 and 1994, and
for each of the three years in the period ended December 31, 1995, appearing in
this Prospectus and Registration Statement have been audited by Ernst & Young
LLP, independent auditors, as set forth in their report thereon appearing
elsewhere herein, and are included in reliance upon such report given upon the
authority of such firm as experts in accounting and auditing.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
     The following documents heretofore filed by the Company with the Commission
pursuant to the Exchange Act are incorporated and made a part of this Prospectus
by reference, except as superseded or modified herein.
 
          (1) The Company's Annual Report on Form 10-K for its fiscal year ended
     December 31, 1995, as amended by Form 10-K/A dated June 14, 1996.
 
          (2) The Company's Quarterly Report on Form 10-Q for the quarter ended
     March 31, 1996.
 
          (3) The Company's Current Report on Form 8-K dated June 19, 1996.
 
          (4) The description of the Company's Common Stock contained in the
     Company's Registration Statement on Form 8-A filed on September 29, 1993.
 
     All documents filed by the Company with the Commission pursuant to Sections
13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date hereof and
prior to the termination of the Offering shall be deemed to be incorporated by
reference in this Prospectus and to be a part hereof from the date of filing of
such documents. Any statement contained in a document incorporated or deemed to
be incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein,
or in any other subsequently filed document that also is or is deemed to be
incorporated by reference herein, modifies or supersedes such statement. Any
such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this Prospectus.
 
     The Company will provide without charge to each person, including any
beneficial owner, to whom a copy of this Prospectus is delivered, upon the
written or oral request of such person, a copy of any or all of the documents
which have been incorporated by reference herein, other than exhibits to such
documents (unless such exhibits are specifically incorporated by reference
therein). Requests for such copies should be directed to the Company's principal
executive offices, Attention: John W. Robbins, Chief Financial Officer,
ClinTrials Research Inc., One Burton Hills Boulevard, Suite 210, Nashville,
Tennessee 37215, telephone number (615) 665-9665.
 
                                       37
<PAGE>   38




                            CLINTRIALS RESEARCH INC.

                                2,600,000 SHARES
                                       OF
                                  COMMON STOCK



                             UNDERWRITING AGREEMENT


                                                        __________________, 1996




J.C. BRADFORD & CO., L.L.C.
PIPER JAFFRAY INC.
SMITH BARNEY INC.
c/o J.C. Bradford & Co., L.L.C.
J.C. Bradford Financial Center
330 Commerce Street
Nashville, Tennessee 37201

Ladies and Gentlemen:

         ClinTrials Research Inc., a Delaware corporation (the "Company"),
proposes to sell to the underwriters named in Schedule I hereto (the
"Underwriters") for whom you are acting as the representatives (the
"Representatives") 2,600,000 shares of the common stock, par value $0.01 per
share (the "Common Stock"), of the Company (the "Firm Shares").  Such shares of
Common Stock are to be sold to the Underwriters, acting severally and not
jointly, in such amounts as are set forth in Schedule I hereto opposite the
name of such Underwriter.  The Company proposes to grant to the Underwriters an
option to purchase up to 390,000 additional shares of Common Stock as provided
for in Section 2 of this Agreement for the purpose of covering over-allotments,
if any (the "Option Shares").  The Firm Shares and the Option Shares purchased
pursuant to this Agreement are hereinafter collectively referred to as the
"Shares."

         1.      Representations and Warranties of the Company.  The Company
represents and warrants to, and agrees with, each of the Underwriters that:

                 (a)      The Company meets the requirements for use of, and
         has filed with the Securities and Exchange Commission (the
         "Commission") under the Securities Act of 1933, as amended (the
         "Securities Act"), a registration statement on Form S-3



<PAGE>   39

         (Registration No. 333-06293), including the related preliminary
         prospectus relating to the Shares, and has filed one or more
         amendments thereto.  Copies of such registration statement and any
         amendments, including any post-effective amendments, and all forms of
         the related prospectuses contained therein and any supplements
         thereto, have been delivered to you.  Such registration statement,
         including the prospectus, Part II, the information incorporated by
         reference, all financial schedules and exhibits thereto, and all
         information deemed to be a part of such Registration Statement
         pursuant to Rule 430A under the Securities Act, as amended at the time
         when it shall become effective, together with any registration
         statement filed by the Company pursuant to Rule 462(b) of the
         Securities Act, is herein referred to as the "Registration Statement,"
         and the prospectus included as part of the Registration Statement on
         file with the Commission that discloses all the information that was
         omitted from the prospectus on the effective date pursuant to Rule
         430A of the Rules and Regulations (as defined below) and in the form
         filed pursuant to Rule 424(b) under the Securities Act is herein
         referred to as the "Final Prospectus."  The prospectus included as
         part of the Registration Statement on the date when the Registration
         Statement became effective is referred to herein as the "Effective
         Prospectus."  Any prospectus included in the Registration Statement
         and in any amendment thereto prior to the effective date of the
         Registration Statement is referred to herein as a "Preliminary
         Prospectus."  For purposes of this Agreement, "Rules and Regulations"
         mean the rules and regulations promulgated by the Commission under
         either the Securities Act or the Securities Exchange Act of 1934, as
         amended (the "Exchange Act"), as applicable.

                 (b)      The Commission has not issued any order preventing or
         suspending the use of any Preliminary Prospectus, and each Preliminary
         Prospectus, at the time of filing thereof, complied with the
         requirements of the Securities Act and the Rules and Regulations, and
         did not include any untrue statement of a material fact or omit to
         state any material fact required to be stated therein or necessary to
         make the statements therein, in the light of the circumstances under
         which they were made, not misleading; except that the foregoing does
         not apply to statements or omissions made in reliance upon and in
         conformity with written information furnished to the Company by any
         Underwriter specifically for use therein (it being understood that the
         only information so provided is the information included in the last
         paragraph on the cover page and in the first and third paragraphs
         under the caption "Underwriting" in the Preliminary, Effective and
         Final Prospectus).  When the Registration Statement becomes effective
         and at all times subsequent thereto up to and including the First
         Closing Date (as hereinafter defined), (i) the Registration Statement,
         the Effective Prospectus and Final Prospectus and any amendments or
         supplements thereto will contain all statements which are required to
         be stated therein in accordance with the Securities Act and the Rules
         and Regulations and will comply with the requirements of the
         Securities Act and the Rules and Regulations, and (ii) neither the
         Registration Statement, the Effective Prospectus nor the Final
         Prospectus nor any amendment or supplement thereto will include any
         untrue statement of a material fact or omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein, in light of the circumstances in which they are made, not
         misleading;


                                      2



<PAGE>   40

         except that the foregoing does not apply to statements or omissions
         made in reliance upon and in conformity with written information
         furnished to the Company by any Underwriter specifically for use
         therein (it being understood that the only information so provided is
         the information included in the last paragraph on the cover page and
         in the first and third paragraphs under the caption "Underwriting" in
         the Final Prospectus).

                 (c)      The documents which are incorporated by reference in
         any Preliminary, Effective and Final Prospectus or from which
         information is so incorporated by reference, when they become
         effective or were filed with the Commission, as the case may be,
         complied in all material respects with the requirements of the
         Securities Act or the Exchange Act, as applicable, and the Rules and
         Regulations, and any documents so filed prior to the termination of
         this offering and incorporated by reference subsequent to the
         effective date of the Registration Statement shall, when they are
         filed with the Commission, conform in all material respects with the
         requirements of the Securities Act and the Exchange Act, as
         applicable, and the Rules and Regulations.

                 (d)      The Company and each subsidiary of the Company (as
         used herein, the term "subsidiary" includes Bio-Research Laboratories,
         Ltd. ("Bio-Research) and any other corporation, joint venture or
         partnership in which the Company or any subsidiary of the Company has
         a direct or indirect ownership interest) is duly incorporated or
         organized, as the case may be, and is validly existing and in good
         standing under the laws of the jurisdiction of its incorporation or
         organization, as the case may be, with full power and authority to own
         its properties and conduct its business as now conducted and is duly
         qualified or authorized to do business and is in good standing in all
         jurisdictions wherein the nature of its business or the character of
         property owned or leased may require it to be qualified or authorized
         to do business.  Each of the Company and its subsidiaries hold all
         licenses, permits, consents and approvals, and has satisfied all
         eligibility and other similar requirements imposed by foreign,
         federal, state and local regulatory bodies, administrative agencies or
         other governmental bodies, agencies or officials, in each case as
         required for the conduct of the business in which it is engaged and is
         contemplated to be engaged as described in the Effective Prospectus
         and the Final Prospectus.

                 (e) The outstanding capital stock of each of the Company's
         corporate subsidiaries has been duly authorized and validly issued and
         is fully paid and nonassessable.   The Company owns all of the
         outstanding shares of capital stock of the Company's corporate
         subsidiaries, free and clear of all liens, claims, encumbrances,
         security interests, restrictions, stockholder agreements, voting
         trusts or other claims of third parties.  Except as set forth in
         Exhibit 1(e) hereto, the Company has no other subsidiaries and is not
         a partner or joint venturer in any partnership or joint venture.  The
         Company's subsidiaries do not have outstanding any option to purchase,
         or any rights or warrants to subscribe for, or any securities or
         obligations convertible into, or any contracts or commitments to issue
         or sell any shares of capital stock or an ownership interest of such
         subsidiary.  There are


                                      3



<PAGE>   41

         no preemptive rights or other rights to subscribe for or purchase any
         shares of the capital stock or an ownership interest of the Company's
         subsidiaries.

                 (f)      The capitalization of the Company as of March 31,
         1996 is as set forth under the caption "Capitalization" in the
         Effective Prospectus and the Final Prospectus, and the Company's
         capital stock conforms to the description thereof contained or
         incorporated by reference in the Effective Prospectus and the Final
         Prospectus.  All the issued shares of capital stock of the Company
         have been duly authorized and validly issued, are fully paid and
         nonassessable.  None of the issued shares of capital stock of the
         Company have been issued in violation of any preemptive or similar
         rights.  The Shares have been duly and validly authorized and, upon
         issuance and delivery and payment therefor in the manner herein
         described, will be validly issued, fully paid and nonassessable.
         Except as set forth in the Effective Prospectus and the Final
         Prospectus,  the Company does not have outstanding any options to
         purchase, or any rights or warrants to subscribe for, or any
         securities or obligations convertible into, or any contracts or
         commitments to issue or sell, any shares of Common Stock of the
         Company.  There are no preemptive rights or other rights to subscribe
         for or to purchase, or any restriction upon the transfer of, any
         shares of Common Stock pursuant to the Company's certificate of
         incorporation, bylaws or any agreement or other instrument to which
         the Company is a party or by which it may be bound.  Neither the
         filing of the Registration Statement nor the offer or sale of the
         Shares as contemplated by this Agreement gives rise to any rights,
         other than those which have been waived or satisfied, for or relating
         to the registration of any shares of Common Stock or any other
         securities of the Company.  The Underwriters will receive good and
         marketable title to the Shares to be issued and delivered hereunder,
         free and clear of all liens, encumbrances, claims, security interests,
         restrictions, stockholders' agreements and voting trusts whatsoever.

                 (g)      All offers and sales of the Company's securities
         prior to the date hereof were at all relevant times duly registered or
         the subject of an available exemption from the registration
         requirements of the Securities Act, and were duly registered or the
         subject of an available exemption from the registration requirements
         of the applicable state securities or Blue Sky laws.

                 (h)      The Company has full legal right, power and authority
         to enter into this Agreement and to sell and deliver the Shares to the
         Underwriters as provided herein, and this Agreement has been duly
         authorized, executed and delivered by the Company and constitutes a
         valid and binding agreement of the Company enforceable against the
         Company in accordance with its terms.  No consent, approval,
         authorization or order of any court or governmental agency or body or
         third party is required for the performance of this Agreement by the
         Company or the consummation by the Company of the transactions
         contemplated hereby, except such as have been obtained and such as may
         be required by the National Association of Securities Dealers, Inc.
         ("NASD") or under the Securities Act, or state securities or Blue Sky
         laws in connection with the purchase and



                                       4



<PAGE>   42



         distribution of the Shares by the Underwriters.  The issue and sale of
         the Shares by the Company, the Company's performance of this Agreement
         and the consummation of the transactions contemplated hereby will not
         result in a breach or violation of, or conflict with, any of the terms
         and provisions of, or constitute a default by the Company or any of
         its subsidiaries under, any indenture, mortgage, deed of trust, loan
         agreement, lease or other agreement or instrument to which the Company
         or any of its subsidiaries is a party or to which the Company or any
         of its subsidiaries or any of their respective properties is subject,
         the certificate of incorporation, bylaws or other governing
         instruments of the Company or any of its subsidiaries or any statute
         or any judgment, decree, order, rule or regulation of any court or
         governmental agency or body applicable to the Company or any of its
         subsidiaries or any of their respective properties.  Neither the
         Company nor any of its subsidiaries is in violation of its certificate
         of incorporation, bylaws or other governing instruments or any law,
         administrative rule or regulation or arbitrators' or administrative or
         court decree, judgment or order or in violation or default (there
         being no existing state of facts which with notice or lapse of time or
         both would constitute a default) in the performance or observance of
         any material obligation, agreement, covenant or condition contained in
         any contract, indenture, deed of trust, mortgage, loan agreement,
         note, lease, agreement or other instrument or permit to which it is a
         party or by which it or any of its properties is or may be bound.

                 (i)      The consolidated financial statements and the related
         notes of the Company, included or incorporated by reference in the
         Registration Statement, the Effective Prospectus and the Final
         Prospectus present fairly the financial position, results of
         operations and changes in financial position and cash flow of the
         Company and its subsidiaries, at the dates and for the periods to
         which they relate, and have been prepared in accordance with United
         States generally accepted accounting principles applied on a
         consistent basis throughout the periods indicated.  The unaudited pro
         forma financial statements included in the Registration Statement and
         the Prospectus comply in all material respects with the applicable
         accounting requirements of Article 11 of Regulation S-X promulgated by
         the Commission, and the pro forma adjustments have been applied
         properly to the historical financial statements.  The financial
         statements and the related notes of Bio-Research included in the
         Registration Statement, the Effective Prospectus and the Final
         Prospectus present fairly the financial position, results of
         operations and changes in financial position and cash flow of Bio-
         Research, at the dates and for the periods to which they relate, and
         were prepared in accordance with United States generally accepted
         accounting principles applied on a consistent basis throughout the
         periods indicated.  The other financial and statistical data included
         or incorporated by reference in the Registration Statement conform to
         the requirements of the Securities Act and the Rules and Regulations
         and present fairly the information presented therein on the basis
         stated in the Effective Prospectus and the Final Prospectus.  Ernst &
         Young LLP, who have certified certain of the financial statements of
         the Company, are independent accountants as required by the Securities
         Act and the Rules and Regulations.  Ernst & Young LLP, who have
         certified



                                       5


<PAGE>   43

         the financial statements of Bio-Research, are independent public
         accountants as required by the Securities Act and the Rules and
         Regulations.

                 (j)      Subsequent to December 31, 1995, neither the Company
         nor any of its subsidiaries has sustained any material loss or
         interference with its business or properties from fire, flood,
         hurricane, accident or other calamity, whether or not covered by
         insurance, or from any labor dispute or court or governmental action,
         order or decree, which is not disclosed in the Effective Prospectus
         and the Final Prospectus; and subsequent to the respective dates as of
         which information is given in the Registration Statement, the
         Effective Prospectus and the Final Prospectus, (i) neither the Company
         nor any of its subsidiaries has incurred any material liabilities or
         obligations, direct or contingent, or entered into any transactions
         not in the ordinary course of business, and (ii) there has not been
         any change in the capital stock, partnership interests, joint venture
         interests, long-term debt, obligations under capital leases or
         short-term borrowings of the Company and its subsidiaries, or any
         issuance of options, warrants or rights to purchase interests or the
         capital stock of the Company or its subsidiaries, or any adverse
         change, or any development involving a prospective adverse change, in
         the general affairs, management, business, prospects, financial
         position, net worth or results of operations of the Company or any of
         its subsidiaries, except in each case as described in or contemplated
         by the Effective Prospectus and the Final Prospectus.

                 (k)      Except as described in the Effective Prospectus and
         the Final Prospectus, there is not pending, or to the knowledge of the
         Company threatened, any legal or governmental action, suit, claim,
         proceeding, inquiry or investigation, to which the Company, any of its
         subsidiaries or any of their officers or directors is a party, or to
         which the property of the Company or any of its subsidiaries is
         subject, before or brought by any court or governmental agency or
         body, wherein an unfavorable decision, ruling or finding could prevent
         or materially hinder the consummation of this Agreement or result in a
         material adverse change in the business condition (financial or
         other), prospects, financial position, net worth or results of
         operations of the Company or any of its subsidiaries.

                 (l)      There are no contracts or other documents required by
         the Securities Act or by the Rules and Regulations to be described in
         the Registration Statement, the Effective Prospectus or the Final
         Prospectus or to be filed as exhibits to the Registration Statement
         which have not been described, incorporated by reference or filed as
         required.  All such contracts to which the Company or any of its
         subsidiaries is a party have been duly authorized, executed and
         delivered by the Company or such subsidiary, constitute valid and
         binding agreements of the Company or such subsidiary and are
         enforceable against the Company or such subsidiary in accordance with
         the terms thereof.  The Company or such subsidiary has performed all
         its obligations required to be performed by it, and is neither in
         default nor has it receive notice of default, under any such contract
         or other material instrument to which it is a party or by which its
         property is bound or



                                       6


<PAGE>   44

         affected.  To the best knowledge of the Company, no other party under
         any such contract or other material instrument to which it is a party
         is in default in any material respect thereunder.

                 (m)      Except as described in the Effective Prospectus and
         the Final Prospectus, the Company and each of its subsidiaries has
         good and marketable title to all real and material personal property
         owned by it, free and clear of all liens, charges, encumbrances or
         defects, except those reflected in the financial statements
         hereinabove described.  The real and personal property and buildings
         referred to in the Effective Prospectus and the Final Prospectus which
         are leased from others by the Company or its subsidiaries are held
         under valid, subsisting and enforceable leases.  The Company or its
         subsidiaries owns or leases all such properties as are necessary to
         their respective operations as now conducted.

                 (n)      The Company's system of internal accounting controls
         is sufficient to meet the broad objectives of internal accounting
         control insofar as those objectives pertain to the prevention or
         detection of errors or irregularities in amounts that would be
         material in relation to the Company's financial statements.

                 (o)      The Company and each of its subsidiaries has filed
         all foreign, federal, state and local income, franchise and sales tax
         returns required to be filed through the date hereof and has paid all
         taxes shown as due therefrom to the extent such taxes have become due
         and are not being contested in good faith; and there is no tax
         deficiency that has been, nor does the Company have knowledge of any
         tax deficiency which is likely to be, asserted against the Company or
         any of its subsidiaries, which if determined adversely could
         materially and adversely affect the earnings, assets, affairs,
         business prospects or condition (financial or other) of the Company or
         any of its subsidiaries.

                 (p)      The Company and each of its subsidiaries operates its
         business in conformity with all applicable statutes, common laws,
         ordinances, decrees, orders, rules and regulations of governmental
         regulatory bodies.  The Company and each of its subsidiaries has all
         licenses, permits, approvals or consents to operate its businesses in
         all locations in which such businesses are currently being operated,
         and the Company is not aware of any existing or imminent matter which
         may adversely impact its or any of its subsidiaries' operations or
         business prospects other than as specifically disclosed in the
         Effective Prospectus and the Final Prospectus.  The Company has not
         engaged in any activity, whether alone or in concert with one of its
         customers, creating the potential for exposure to material civil or
         criminal monetary liability or other material sanctions under federal
         or state laws regulating consumer credit transactions, debt collection
         practices or land sales practices.

                 (q)      Neither the Company nor any of its subsidiaries is
         currently engaging in any activity, whether alone or in concert with
         others, which constitutes a violation of any




                                       7


<PAGE>   45

         foreign, federal, state or local laws prohibiting fraudulent or
         abusive practices connected in any way with the provision of health
         care services or the billing for such services provided to a
         beneficiary of any foreign, federal, state or local health insurance
         program.

                 (r)      Neither the Company nor any of its subsidiaries has
         failed to file with the applicable regulatory authorities any
         statements, reports, information or forms required by any applicable
         law, regulation or order, all such filings or submissions were in
         compliance with applicable laws when filed, and no deficiencies have
         been asserted by any regulatory commission, agency or authority with
         respect to such filings or submissions.  Neither the Company nor any
         of its subsidiaries has failed to maintain in full force and effect
         any licenses, certifications, registrations, permits or approvals
         necessary or proper for the conduct of their respective businesses, or
         received any notification that any revocation or limitation thereof is
         threatened or pending, and there is not to the knowledge of the
         Company pending any change under any law, regulation, license or
         permit which could materially adversely affect the business,
         operations, property or business prospects of the Company or any
         subsidiary of the Company.  Neither the Company nor any of its
         subsidiaries has received any notice of violation of or been
         threatened with a charge of violating and is not under investigation
         with respect to a possible violation of any provision of any law,
         regulation or order.

                 (s)      No labor dispute exists or is imminent with any of
         the employees of the Company or any of its subsidiaries or otherwise
         which could materially adversely affect the Company or any of its
         subsidiaries.  The Company is not aware of any existing or imminent
         labor disturbance by employees of the Company or any of its
         subsidiaries which could be expected to materially adversely effect
         the condition (financial or otherwise), results of operations,
         properties, affairs, management, business affairs or business
         prospects of the Company or any of its subsidiaries.

                 (t)      The Company and each of its subsidiaries owns or
         licenses the intellectual property, including but not limited to, the
         proprietary technology, software, copyrights, trademarks, service
         marks and trade names presently employed in connection with their
         respective businesses, and neither the Company nor any of its
         subsidiaries has received any notice of infringement of or conflict
         with asserted rights of others with respect to any of the foregoing
         which, alone or in the aggregate, if the subject of an unfavorable
         decision, ruling or finding, could result in any material adverse
         change in the condition, financial or otherwise, or in the earnings,
         business affairs or business prospects of the Company or any of its
         subsidiaries.

                 (u)      The Company and each of its subsidiaries is insured
         by insurers of recognized financial responsibility against such losses
         and risks and in such amounts as are prudent and customary in the
         businesses in which it is engaged; and neither the Company nor any of
         its subsidiaries has any reason to believe that it will not be able to
         renew its existing insurance coverage as and when such coverage
         expires or to obtain similar


                                       8


<PAGE>   46

         coverage from similar insurers as may be necessary to continue its
         business at a comparable cost.

                 (v)      Neither the Company nor any of its subsidiaries is in
         violation of any foreign, federal, state or, local law, regulation,
         rule or ordinance relating to occupational safety and health or to the
         storage, handling or transportation of hazardous or toxic materials
         and the Company and each of its subsidiaries has received all
         licenses, certifications, regulations, permits and other approvals
         required of it under applicable foreign, federal, state and local
         occupational safety and health and environmental laws and regulations
         to conduct its respective businesses, and the Company and each of its
         subsidiaries is in compliance with all terms and conditions of any
         such licenses, certificates, regulations, permits and approvals,
         except any such violation of law or regulation, failure to receive
         required permits, licenses or other approvals or failure to comply
         with the terms and conditions of such permits, licenses or approvals
         which would not result in a material adverse change in the condition,
         financial or otherwise, or in the earnings, business affairs or
         prospects of the Company or any of its subsidiaries.

                 (w)      Neither the Company or any of its subsidiaries nor
         any director, officer, agent, employee or other person acting on
         behalf of the Company or any of its subsidiaries has (i) used, or
         authorized the use of, any corporate or other funds for unlawful
         payments, contributions, gifts or entertainment (ii) made unlawful
         expenditures relating to political activity to government officials or
         others, or (iii) established or maintained any unlawful or unrecorded
         funds in violation of any foreign, federal, state or local law or
         regulation, including Section 30A of the Exchange Act.  Neither the
         Company or any of its subsidiaries nor any director, officer, agent,
         employee or other person acting on behalf of the Company or any of its
         subsidiaries has accepted or received any unlawful contributions,
         payments, gifts or expenditures.

                 (x)      Except where such failures to comply or violations
         would not in the aggregate have a material adverse effect on the
         Company or any of its subsidiaries, the Company and each of its
         subsidiaries has complied with the Immigration Reform and Control Act
         of 1986 and all regulations promulgated thereunder ("IRCA") with
         respect to the completion and maintenance of Forms I-9, Employment
         Eligibility Verification Forms, for all of its current employees and
         reverification of the employment status of any and all employees whose
         employment authorization documents indicated a limited period of
         employment authorization.  With respect to all former employees who
         left the Company's or any of its subsidiaries' employment within three
         years prior to the date hereof, the Company and each of its
         subsidiaries has complied with IRCA with respect to the maintenance of
         Forms 1-9 for at least three years or for one year beyond the date of
         termination, whichever is later.  The Company and each of its
         subsidiaries has had no immigration violations and has employed only
         individuals authorized to work in the United States and has never been
         the subject of any inspection or investigation relating to its
         compliance with or violation of IRCA.  Neither the Company nor any
         subsidiary has been



                                       9


<PAGE>   47

         warned, fined or otherwise penalized by reason or any failure to
         comply with IRCA, and no such proceeding is pending or threatened.

                 (y)      The Company is not, will not become as a result of
         the transactions contemplated hereby, and does not intend to conduct
         its business in a manner that would cause it or any of its
         subsidiaries to become, an "investment company" or a company
         "controlled" by an "investment company" within the meaning of the
         Investment Company Act of 1940.

                 (z)      Neither the Company nor any of its subsidiaries nor
         any of the directors, officers, employees or agents of the Company or
         any of its subsidiaries have taken and will not take, directly or
         indirectly, any action designed to cause or result in, or which has
         constituted or which might be expected to constitute, stabilization or
         manipulation of the price of the Common Stock.

                 (aa)  The Shares have been approved for listing on the Nasdaq
         Stock Market's National Market System (the "Nasdaq National Market")
         upon notice of issuance.

         2.      Purchase, Sale and Delivery of the Shares.

                 (a)      On the basis of the representations, warranties,
         agreements and covenants herein contained and subject to the terms and
         conditions herein set forth, the Company agrees to sell to each
         Underwriter, and each of the Underwriters, severally and not jointly,
         agrees to purchase at a purchase price of $______ per share, the
         number of Firm Shares set forth opposite such Underwriter's name in
         Schedule I hereto.

                 (b) The Company hereby grants to the Underwriters an option to
         purchase 390,000 additional shares of Common Stock, solely for the
         purpose of covering over-allotments in the sale of Firm Shares, all or
         any portion of the Option Shares at the purchase price per share set
         forth above.  The option granted hereby may be exercised as to all or
         any part of the Option Shares at any time within 30 days after the
         date of the Final Prospectus.  The Underwriters shall not be under any
         obligation to purchase any Option Shares prior to the exercise of such
         option.  The option granted hereby may be exercised by the
         Underwriters by the Representatives giving written notice to the
         Company setting forth the number of Option Shares to be purchased and
         the date and time for delivery of and payment for such Option Shares
         and stating that the Option Shares referred to therein are to be used
         for the purpose of covering over-allotments in connection with the
         distribution and sale of the Firm Shares.  If such notice is given
         prior to the First Closing Date (as defined herein), the date set
         forth therein for such delivery and payment shall not be earlier than
         two full business days thereafter or the First Closing Date, whichever
         occurs later.  If such notice is given on or after the First Closing
         Date, the date set forth therein for such delivery and payment shall
         not be earlier than three full business days thereafter.  In either
         event, the date so set forth shall not be more than four full business
         days after the date of such


                                       10



<PAGE>   48

         notice.  The date and time set forth in such notice is herein called
         the "Option Closing Date."  Upon exercise of the option, the Company
         shall become obligated to sell to the Underwriters, and, subject to
         the terms and conditions herein set forth, the Underwriters shall
         become obligated to purchase, for the account of each Underwriter,
         from the Company, severally and not jointly, the number of Option
         Shares specified in such notice.  Option Shares shall be purchased for
         the accounts of the Underwriters in proportion to the number of Firm
         Shares set forth opposite such Underwriter's name in Schedule I
         hereto, except that the respective purchase obligations of each
         Underwriter shall be adjusted so that no Underwriter shall be
         obligated to purchase fractional Option Shares.

                 (c)      Certificates in definitive form for the Firm Shares
         which each Underwriter has agreed to purchase hereunder shall be
         delivered by or on behalf of the Company to the Underwriters for the
         account of such Underwriter against payment by such Underwriter or on
         its behalf of the purchase price therefor by certified or official
         bank check or checks in next day funds to the order of the Company at
         the offices of J.C. Bradford & Co., L.L.C. ("Bradford"), 330 Commerce
         Street, Nashville, Tennessee  37201, or at such other place as may be
         agreed upon by Bradford and the Company, at 10:00 A.M., Nashville
         time, on the third full business day after this Agreement becomes
         effective, or, at the election of the Representatives, on the fourth
         full business day after this Agreement becomes effective, if it
         becomes effective after 4:30 P.M. Eastern time, or at such other time
         not later than the seventh full business day thereafter as the
         Representatives and the Company may determine, such time of delivery
         against payment being herein referred to as the "First Closing Date."
         The First Closing Date and the Option Closing Date are herein
         individually referred to as the "Closing Date" and collectively
         referred to as the "Closing Dates."  Certificates in definitive form
         for the Option Shares which each Underwriter shall have agreed to
         purchase hereunder shall be similarly delivered by or on behalf of the
         Company on the Option Closing Date.  The certificates in definitive
         form for the Shares to be delivered will be in good delivery form and
         in such denominations and registered in such names as Bradford may
         request not less than 48 hours prior to the First Closing Date or the
         Option Closing Date, as the case may be.  Such certificates will be
         made available for checking and packaging at a location in New York,
         New York as may be designated by Bradford, at least 24 hours prior to
         the First Closing Date or the Option Closing Date, as the case may be.
         It is understood that Bradford may (but shall not be obligated to)
         make payment on behalf of any Underwriter or Underwriters for the
         Shares to be purchased by such Underwriter or Underwriters.  No such
         payment shall relieve such Underwriter or Underwriters from any of its
         or their obligations hereunder.

         3.      Offering by the Underwriters.  After the Registration
Statement becomes effective, the several Underwriters propose to offer for sale
to the public the Firm Shares and any Option Shares which may be sold at the
price and upon the terms set forth in the Final Prospectus.

         4.      Covenants of the Company.      The Company covenants and
agrees with each of the Underwriters that:



                                       11


<PAGE>   49


                          (a)         The Company shall comply with the
         provisions of and make all requisite filings with the Commission
         pursuant to Rules 424 and 430A of the Rules and Regulations and shall
         notify the Representatives promptly (in writing, if requested) of all
         such filings.  The Company shall notify the Representatives promptly
         of any request by the Commission for any amendment of or supplement to
         the Registration Statement, the Effective Prospectus or the Final
         Prospectus or for additional information; the Company shall prepare
         and file with the Commission, promptly upon the Representatives'
         request, any amendments of or supplements to the Registration
         Statement, the Effective Prospectus or the Final Prospectus which, in
         the Representatives' opinion, may be necessary or advisable in
         connection with the distribution of the Shares; and the Company shall
         not file any amendment of or supplement to the Registration Statement,
         the Effective Prospectus or the Final Prospectus which is not approved
         by the Representatives after reasonable notice thereof.  The Company
         shall advise the Representatives promptly of the issuance by the
         Commission or any jurisdiction or other regulatory body of any stop
         order or other order suspending the effectiveness of the Registration
         Statement, suspending or preventing the use of any Preliminary
         Prospectus, the Effective Prospectus or the Final Prospectus or
         suspending the qualification of the Shares for offering or sale in any
         jurisdiction, or of the institution of any proceedings for any such
         purpose; and the Company shall use its best efforts to prevent the
         issuance of any stop order or other such order and, should a stop
         order or other such order be issued, to obtain as soon as possible the
         lifting thereof.

                          (b)         The Company will take or cause to be
         taken all necessary action and furnish to whomever the Representatives
         direct such information as may be reasonably required in qualifying
         the Shares for offer and sale under the securities or Blue Sky laws of
         such jurisdictions as the Underwriters may designate and will continue
         such qualifications in effect for as long as may be reasonably
         necessary to complete the distribution of the Shares.

                          (c)         Within the time during which a Final
         Prospectus relating to the Shares is required to be delivered under
         the Securities Act, the Company shall comply with all requirements
         imposed upon it by the Securities Act, as now and hereafter amended,
         and by the Rules and Regulations, as from time to time in force, so
         far as is necessary to permit the continuance of sales of or dealings
         in the Shares as contemplated by the provisions hereof and the Final
         Prospectus.  If during such period any event occurs as a result of
         which the Final Prospectus as then amended or supplemented would
         include an untrue statement of a material fact or omit to state a
         material fact necessary to make the statements therein, in the light
         of the circumstances then existing, not misleading, or if during such
         period it is necessary to amend the Registration Statement or
         supplement the Final Prospectus to comply with the Securities Act, the
         Company shall promptly notify the Representatives and shall amend the
         Registration Statement or supplement the Final Prospectus (at the
         expense of the Company) so as to correct such statement or omission or
         effect such compliance.



                                       12


<PAGE>   50

                         (d)         The Company will furnish without charge 
         to the Representatives and make available to the Underwriters
         copies of the Registration Statement (four of which shall be signed
         and shall be accompanied by all exhibits, including any which are
         incorporated by reference, which have not previously been furnished),
         each Preliminary Prospectus, the Effective Prospectus and the Final
         Prospectus, and all amendments and supplements thereto, including any
         prospectus or supplement prepared after the effective date of the
         Registration Statement, in each case as soon as available and in such
         quantities as the Underwriters may reasonably request.

                          (e)         The Company will (i) deliver to the
         Representatives at such office or offices as the Representatives may
         designate as many copies of the Preliminary Prospectus and Final
         Prospectus as the Representatives may reasonably request, and (ii) for
         a period of not more than nine months after the Registration Statement
         becomes effective, send to the Underwriters as many additional copies
         of the Final Prospectus and any supplement thereto as the
         Representatives may reasonably request.

                          (f)         The Company shall make generally
         available to its security holders, in the manner contemplated by Rule
         158(b) under the Securities Act as promptly as practicable and in any
         event no later than 45 days after the end of its fiscal quarter in
         which the first anniversary of the effective date of the Registration
         Statement occurs, an earnings statement satisfying the provisions of
         Section 11(a) of the Securities Act covering a period of at least 12
         consecutive months beginning after the effective date of the
         Registration Statement.

                          (g)         The Company will apply the net proceeds
         from the sale of the Shares as set forth under the caption "Use of
         Proceeds" in the Final Prospectus.

                          (h)         During a period of five years from the
         effective date of the Registration Statement or such longer period as
         the Representatives may reasonably request, the Company will furnish
         to the Representatives copies of all reports and other communications
         (financial or other) furnished by the Company to its stockholders and,
         as soon as available, copies of any reports or financial statements
         furnished or filed by the Company to or with the Commission or any
         national securities exchange on which any class of securities of the
         Company may be listed.

                          (i)         The Company will, from time to time,
         after the effective date of the Registration Statement file with the
         Commission such reports as are required by the Securities Act, the
         Exchange Act and the Rules and Regulations, and shall also file with
         foreign, state and other governmental securities commissions in
         jurisdictions where the Shares have been sold by the Underwriters (as
         the Representatives shall have advised the Company in writing) such
         reports as are required to be filed by the securities acts and the
         regulations of those foreign jurisdictions or states.



                                       13


<PAGE>   51

                          (j)         Except pursuant to this Agreement or with
         the Representatives' written consent, for a period of 120 days from
         the effective date of the Registration Statement, the Company will
         not, and the Company has provided agreements executed by each of its
         executive officers, directors and each beneficial owner of five
         percent or more of the Company's outstanding Common Stock providing
         that for a period of 120 days from the effective date of the
         Registration Statement, such person or entity will not, offer for
         sale, sell (other than the issuance by the Company of Common Stock
         pursuant to the exercise of options granted pursuant to existing
         employee benefit plans and agreements, other existing compensation
         agreements and existing stock options or outstanding warrants or
         securities convertible into Common Stock), grant any options (other
         than pursuant to existing employee benefit plans and agreements),
         rights or warrants with respect to any shares of Common Stock,
         securities convertible into Common Stock or any other capital stock of
         the Company, or otherwise dispose of, directly or indirectly, any
         shares of Common Stock or such other securities or capital stock.

                          (k)         Neither the Company or any of its
         subsidiaries nor any of their respective officers, directors or
         affiliates will take, directly or indirectly, any action designed to
         cause or result in, or which might constitute or be expected to
         constitute, stabilization or manipulation of the price of the Common
         Stock.

                          (l)         The Company and each of its subsidiaries
         will either conduct its business and operations as described in the
         Final Prospectus or, if the Company or any of its subsidiaries makes
         any material change to its business or operations as so conducted,
         promptly disclose such change generally to the Company's security
         holders.

         5.      Expenses.  The Company agrees with the Underwriters that (a)
whether or not the transactions contemplated by this Agreement are consummated
or this Agreement becomes effective or is terminated, the Company will pay all
fees and expenses incident to the performance of the obligations of the Company
hereunder, including, but not limited to, (i) the Commission's registration
fee, (ii) the expenses of printing (or reproduction) and distributing the
Registration Statement (including the financial statements therein and all
amendments and exhibits thereto), each Preliminary Prospectus, the Effective
Prospectus, the Final Prospectus, any amendments or supplements thereto, any
Marketing Materials (as defined herein) and this Agreement and other
underwriting documents, including Underwriter's Questionnaires, Underwriter's
Powers of Attorney, Blue Sky Memoranda, Agreements Among Underwriters and
Selected Dealer Agreements, (iii) fees and expenses of accountants and counsel
for the Company, (iv) expenses of registration or qualification of the Shares
under state Blue Sky and securities laws, including the fees and disbursements
of counsel to the Underwriters in connection therewith, (v) filing fees paid or
incurred by the Underwriters in connection with filings with the NASD, (vi)
expenses of listing the Shares on the Nasdaq National Market, (vii) all travel,
lodging and reasonable living expenses incurred by the Company in connection
with marketing, dealer and other meetings attended by the Company and the
Underwriters in marketing the Shares, (viii) the costs and charges of the
Company's transfer agent and registrar and the cost of preparing the
certificates



                                       14


<PAGE>   52

for the Shares, and (ix) all other costs and expenses incident to the
performance of their obligations hereunder not otherwise provided for in this
Section; and (b) all out-of-pocket expenses, including counsel fees,
disbursements and expenses, incurred by the Underwriters in connection with
investigating, preparing to market and marketing the Shares and proposing to
purchase and purchasing the Shares under this Agreement, will be borne and paid
by the Company if the sale of the Shares provided for herein is not consummated
(i) by reason of the termination of this Agreement by the Company pursuant to
Section 12(a)(i) or (ii) by reason of the termination of this Agreement by the
Representatives pursuant to Section 12(b)(ii), (iii), (iv) or (v) of this
Agreement.

         6.      Conditions of the Underwriters' Obligations.  The respective
obligations of the Underwriters to purchase and pay for the Firm Shares shall
be subject, in their discretion, to the accuracy of the representations and
warranties of the Company herein as of the date hereof and as of the Closing
Date as if made on and as of the Closing Date, to the accuracy of the
statements of the Company's officers made pursuant to the provisions hereof, to
the performance by the Company of all of their covenants and agreements
hereunder and to the following additional conditions:

                 (a)      The Registration Statement and all post-effective
         amendments thereto shall have become effective not later than 5:30
         P.M., Washington, D.C. time, on the day following the date of this
         Agreement, or such later time and date as shall have been consented to
         by the Representatives and all filings required by Rule 424 and Rule
         430A of the Rules and Regulations shall have been made; no stop order
         suspending the effectiveness of the Registration Statement shall have
         been issued and no proceedings for that purpose shall have been
         instituted or threatened or, to the knowledge of the Company or the
         Underwriters, shall be contemplated by the Commission; any request of
         the Commission for additional information (to be included in the
         Registration Statement or the Final Prospectus or otherwise) shall
         have been complied with to the Representative's satisfaction; and the
         NASD, upon review of the terms of the public offering of the Shares,
         shall not have objected to such offering, such terms or the
         Underwriters' participation in the same.

                 (b)      No Underwriter shall have advised the Company that
         the Registration Statement, Preliminary Prospectus, the Effective
         Prospectus or Final Prospectus, or any amendment or any supplement
         thereto, contains an untrue statement of fact which, in the
         Representatives' reasonable judgment, is material, or omits to state a
         fact which, in the Representatives' reasonable judgment, is material
         and is required to be stated therein or necessary to make the
         statements therein not misleading and the Company shall not have cured
         such untrue statement of fact or stated a statement of fact required
         to be stated therein.



                                       15


<PAGE>   53

            (c)         The Representatives shall have received an opinion, 
dated the Closing Date, from Harwell Howard Hyne Gabbert & Manner, P.C. 
counsel for the Company, to the effect that:

                          (i)         The Company has been duly incorporated
         and is validly existing as a corporation under the laws of the
         State of Delaware, with corporate power and authority to own its
         properties and conduct its business as now conducted, and is duly
         qualified to do business as a foreign corporation in good standing in
         all other jurisdictions where the failure to so qualify would have a
         material adverse effect upon the Company and its subsidiaries. The
         Company holds all licenses, certificates, permits, franchises and
         authorizations from governmental authorities necessary for the conduct
         of its business, except for those the absence of which would not have
         a material adverse effect on the Company.

                          (ii)        Each of the Company's subsidiaries is
         validly existing and in good standing under the laws of the
         state or jurisdiction of its incorporation or organization, as the
         case may be, with power and authority to own its properties and
         conduct its business as now conducted, and is duly qualified or
         authorized to do business and is in good standing in all other
         jurisdictions where the failure to so qualify would have a material
         adverse effect upon the business of the Company and its subsidiaries. 
         The outstanding stock of each of the Company's corporate  subsidiaries
         is duly authorized, validly issued, fully paid and nonassessable.
         Except for the pledge of all of the outstanding capital stock of each
         subsidiary to NationsBank of Tennessee, N.A.  The Company owns all of
         the outstanding capital stock of each of the Company's corporate
         subsidiaries, free and clear of all liens, encumbrances, equities and
         claims.  The partnership and joint venture interests of each of the
         partnerships and joint ventures in which the Company or any subsidiary
         is a partner or joint venturer are duly authorized, validly issued,
         fully paid and nonassessable, and the partnership and joint venture
         interests owned by the Company or a subsidiary thereof are owned clear
         of any lien, encumbrance, pledge, equity or claim of any kind.  The
         Company's subsidiaries do not have outstanding any options to
         purchase, or any rights or warrants to subscribe for, or any
         securities or obligations convertible into, or any contracts or
         commitments to issue or sell any shares of capital stock or an
         ownership interest of such subsidiary and there are no preemptive
         rights or other rights to subscribe for or purchase any shares of the
         capital stock or any ownership interest of the Company's subsidiaries. 
         Each of the Company's subsidiaries holds all licenses, certificates,
         permits, franchises and authorizations from governmental authorities
         necessary for the conduct of its business, except for those the
         absence of which would not have a material adverse effect on such
         subsidiary.

                          (iii)       As of the dates specified therein, the
         Company had authorized and issued capital stock as set forth
         under the caption "Capitalization" in the Final



                                       16


<PAGE>   54

         Prospectus.  All of the outstanding shares of Common Stock have been
         duly authorized and are validly issued, fully paid and nonassessable,
         and the Shares have been duly authorized, and upon issuance thereof
         and payment therefor as provided herein, will be validly issued, fully
         paid and nonassessable; none of the issued shares have been issued in
         violation of or subject to any preemptive rights provided for by law,
         agreement or the Company's certificate of incorporation.  Except as
         described in the Effective Prospectus and the Final Prospectus, the
         Company does not have outstanding any options to purchase, or any
         rights or warrants to subscribe for, or any securities or obligations
         convertible into, or any contracts or commitments to issue or sell any
         shares of capital stock,  and there are no preemptive rights or other
         rights to subscribe for or purchase any shares of the capital stock of
         the Company, or any restriction upon the transfer of, the Shares
         pursuant to the Company's certificate of incorporation or bylaws or
         any agreement or other instrument to which the Company is a party or
         by which it may be bound, except as described in the Effective
         Prospectus and Final Prospectus.  Neither the filing of the
         Registration Statement nor the offer or sale of the Shares as
         contemplated by this Agreement gives rise to any rights, other than
         those which have been waived or satisfied, for or relating to the
         registration of any shares of Common Stock or any other securities of
         the Company.  The Underwriters will receive good and marketable title
         to the Shares to be issued and delivered pursuant to this Agreement,
         free and clear of all liens, encumbrances, claims, security interests,
         restrictions, stockholders agreements and voting trusts whatsoever.
         The capital stock of the Company and the Shares conform to the
         description thereof contained in the Final Prospectus.  All offers and
         sales of the Company's securities prior to the date hereof were at all
         relevant times duly registered or exempt from the registration
         requirements of the Securities Act and were duly registered or the
         subject of an exemption from the registration requirements of
         applicable state securities or Blue Sky laws.

                          (iv)        No consent, approval, authorization or
         order of any court or governmental or regulatory agency or body
         or third party is required for the performance of this Agreement by
         the Company or the consummation by the Company of the transactions
         contemplated hereby, except such as have been obtained under the
         Securities Act and such as may be required by the NASD and under state
         securities or Blue Sky laws in connection with the purchase and
         distribution of the Shares by the several Underwriters.  The
         performance of this Agreement by the Company and the consummation by
         the Company of the transactions contemplated hereby will not conflict
         with or result in a breach or violation by the Company of any of the
         terms or provisions of, or constitute a default by the Company under,
         any indenture, mortgage, deed of trust, loan agreement, lease or other
         agreement or instrument, known to such counsel, to which the Company
         or any of its subsidiaries is a party or to which the Company or any
         of its subsidiaries or their respective properties is subject, the
         certificate of



                                       17


<PAGE>   55

         incorporation or bylaws of the Company or any of its subsidiaries, any
         statute, or any judgment, decree, order, rule or regulation, known to
         such counsel, of any court or governmental agency or body applicable
         to the Company or any of its subsidiaries or their respective
         properties.

                 (v)      The Company has full legal right, power and authority
         to enter into this Agreement and to issue, sell and deliver the Shares
         to be sold by it to the Underwriters as provided herein, and this
         Agreement has been duly authorized, executed and delivered by the
         Company and constitutes the valid and legally binding obligation of
         the Company enforceable against the Company in accordance with its
         terms.

                 (vi)     Except as described in the Final Prospectus, there is
         not pending or, to the knowledge of such counsel, threatened, any
         action, suit, proceeding, inquiry or investigation, to which the
         Company or any of its subsidiaries is a party, or to which the
         property of the Company or any of its subsidiaries is subject, before
         or brought by any court or governmental agency or body, which, if
         determined adversely to the Company or any of its subsidiaries, could
         result in any material adverse change in the business, financial
         position, net worth or results of operations, or could materially
         adversely affect the properties or assets, of the Company or any of
         its subsidiaries.

                 (vii)    To the knowledge of such counsel, no default exists,
         and no event has occurred which with notice or after the lapse of time
         to cure or both, would constitute a default, in the due performance
         and observance of any term, covenant or condition of any indenture,
         mortgage, deed of trust, loan agreement, lease or other agreement or
         instrument to which the Company or any of its subsidiaries is a party
         or to which its properties are subject, or of the certificate of
         incorporation or bylaws of the Company or any of its subsidiaries.

                 (viii)   Neither the Company nor any of its subsidiaries is in
         violation of any law, ordinance, administrative or governmental rule
         or regulation applicable to the Company or any of its subsidiaries or
         any decree of any court or governmental agency or body having
         jurisdiction over the Company or any of its subsidiaries.

                 (ix)     The Registration Statement and all post-effective
         amendments thereto have become effective under the Securities Act,
         and, to the knowledge of such counsel, no stop order suspending the
         effectiveness of the Registration Statement has been issued and no
         proceedings for that purpose have been instituted or are threatened,
         pending or contemplated by the Commission.  All filings required by
         Rule 424 and Rule 430A of the Rules and Regulations have been made;
         the Registration Statement, the Effective Prospectus and Final
         Prospectus,



                                       18


<PAGE>   56

         and any amendments or supplements thereto, as of their respective
         effective or issue dates, complied as to form in all material respects
         with the requirements of the Securities Act and the Rules and
         Regulations; the descriptions in the Registration Statement, the
         Effective Prospectus and the Final Prospectus of statutes,
         regulations, legal and governmental proceedings, and contracts and
         other documents are accurate in all material respects and present
         fairly the information required to be stated; and such counsel does
         not know of any pending or threatened legal or governmental
         proceedings, statutes or regulations required to be described in the
         Final Prospectus which are not described as required nor of any
         contracts or documents of a character required to be described in the
         Registration Statement or the Final Prospectus or to be filed as
         exhibits to the Registration Statement which are not described and
         filed as required.

                          (x)         The Company is not, and will not be as a
         result of the consummation of the transactions contemplated by
         this Agreement, an "investment company" within the meaning of the
         Investment Company Act of 1940, as amended.

                          (xi)        The Company has the corporate power and
         corporate authority to execute, deliver and carry out the terms
         of the Asset Purchase Agreement and all documents and agreements
         necessary to give effect to the provisions thereof and to consummate
         the transactions contemplated on the part of the Company thereby; the
         Company has taken all action required by law, and its Certificate of
         Incorporation and Bylaws, to authorize such execution, delivery and
         consummation of the Asset Purchase Agreement (as hereinafter defined)
         and all other agreements delivered by the Company in connection
         therewith; the Asset Purchase Agreement and all other agreements
         delivered by the Company in connection therewith constitute the valid
         and binding obligations of the Company enforceable in accordance with
         their respective terms, except as enforcement may be limited by
         bankruptcy, insolvency, reorganization or similar laws affecting
         creditors' rights generally and by general principles of equity.

         In addition to the matters set forth above, such opinion shall also
include a statement to the effect that nothing has come to the attention of
such counsel which leads them to believe that the Registration Statement, the
Effective Prospectus and the Final Prospectus or any amendment or supplement
thereto contains an untrue statement of a material fact or omits to state a
material fact required to be stated therein or necessary to make the statements
therein not misleading (except that such counsel need express no view as to
financial statements, schedules and other financial or statistical information
included, or incorporated by reference therein).

                 (d)      The Underwriters shall have received the written
         consent of counsel to Bio-Research and its shareholders for the
         Underwriters to rely on their opinion to be delivered to the Company
         pursuant to Section 11.3 of the Asset Purchase Agreement.



                                       19


<PAGE>   57

                  (e)     The Underwriters shall have received an opinion or
         opinions, dated the Closing Date, of Bass, Berry & Sims PLC, counsel
         for the Underwriters, with respect to the Registration Statement and
         the Final Prospectus, and such other related matters as the
         Underwriters may require, and the Company shall have furnished to such
         counsel such documents as they may reasonably request for the purpose
         of enabling them to pass upon such matters.

                 (f)      The Representatives shall have received from Ernst &
         Young, LLP, a letter dated the date hereof and, at the Closing Date, a
         second letter dated the Closing Date, in form and substance
         satisfactory to the Representatives, stating that they are independent
         public accountants with respect to the Company and Bio- Research
         within the meaning of the Securities Act and the applicable Rules and
         Regulations, and to the effect that:

                          (i)         In their opinion, the financial
                 statements and schedules examined by them and included or
                 incorporated by reference in the Registration Statement comply
                 as to form in all material respects with the applicable
                 accounting requirements of the Securities Act and the
                 published Rules and Regulations and are presented in
                 accordance with United States generally accepted accounting
                 principles consistently applied; and they have made a review
                 in accordance with standards established by the American
                 Institute of Certified Public Accountants of the interim
                 financial statements, selected financial data, pro forma
                 financial data and/or condensed financial statements derived
                 from audited financial statements of the Company and/or
                 Bio-Research;

                          (ii)        The unaudited selected financial
                 information included in the Preliminary Prospectus and the
                 Final Prospectus under the captions "Prospectus Summary" and
                 "Selected Consolidated Financial Data" for the three years
                 ended December 31, 1995, agrees with the corresponding amounts
                 in the audited consolidated financial statements included or
                 incorporated by reference in the Final Prospectus or
                 previously reported on by them;

                          (iii)       On the basis of a reading of the latest
                 available interim  financial statements (unaudited) of the
                 Company and its subsidiaries, a reading of the minute books of
                 the Company and its subsidiaries, inquiries of officials of
                 the Company and its subsidiaries responsible for financial and
                 accounting matters and other specified procedures, all of
                 which have been agreed to by the Representatives, nothing came
                 to their attention that caused them to believe that:

                                      (A)      the amounts included in the
                          Preliminary Prospectus and the Final Prospectus under
                          the caption "Prospectus Summary" for the three years
                          ended December 31, 1995, do not agree with the
                          corresponding amounts in the audited consolidated
                          financial statements included or



                                       20


<PAGE>   58

         incorporated by reference in the Final Prospectus or previously
reported on by them;

                                      (B)      the unaudited financial
                          statements included or incorporated by reference in
                          the Registration Statement do not comply as to form
                          in all material respects with the accounting
                          requirements of the federal securities laws and the
                          related published rules and regulations thereunder or
                          are not in conformity with generally accepted
                          accounting principles applied on a basis
                          substantially consistent with the basis for the
                          audited financial statements contained or
                          incorporated by reference in the Registration
                          Statement;

                                      (C)      any other unaudited financial
                          statement data included in the Final Prospectus do
                          not agree with the corresponding items in the audited
                          financial statements from which data was derived and
                          any such unaudited data were not determined on a
                          basis substantially consistent with the basis for the
                          corresponding amounts in the audited financial
                          statements contained or incorporated by reference in
                          the Final Prospectus;

                                      (D)      at a specified date not more
                          than five days prior to the date of delivery of such
                          respective letter, there was any change in the
                          capital stock, decline in total assets or
                          stockholders' equity, increase in long-term debt of
                          the Company and its subsidiaries, or other items
                          specified by the Representatives, in each case as
                          compared with amounts shown in the latest balance
                          sheets included in the Final Prospectus, except in
                          each case for changes, decreases or increases which
                          they are described in such letters; and

                                      (E)      for the period from the closing
                          date of the latest statements of income included in
                          the Effective Prospectus and the Final Prospectus to
                          a specified date not more than five days prior to the
                          date of delivery of such respective letter, there
                          were any decreases in service revenues, net service
                          revenue and net income per share of the Company, or
                          other items specified by the Representatives, in each
                          case as compared with the corresponding period of the
                          preceding year, except in each case for decreases
                          which are described in such letter.

                          (iv)        They have carried out certain specified
         procedures, not constituting an audit, with respect to certain
         amounts, percentages and financial information specified by you which
         are derived from the general accounting records of the Company and its
         subsidiaries, which appear in the Effective Prospectus and the Final
         Prospectus and have compared and agreed such amounts, percentages and
         financial information with the accounting records of the Company



                                       21
<PAGE>   59

         and its subsidiaries or to analyses and schedules prepared by the
         Company and its subsidiaries from its detailed accounting records.

         In the event that the letters to be delivered referred to above set
         forth any such changes, decreases or increases, it shall be a further
         condition to the obligations of the Underwriters that the Underwriters
         shall have determined, after discussions with officers of the Company
         responsible for financial and accounting matters and with Ernst &
         Young LLP, that such changes, decreases or increases as are set forth
         in such letters do not reflect a material adverse change in the total
         assets, stockholders' equity, long-term debt of the Company, or other
         items specified by the Representatives as compared with the amounts
         shown in the latest balance sheets of the Company included in the
         Final Prospectus, or a material adverse change in service revenues or
         net service revenues of the Company, or other items specified by the
         Representatives, in each case as compared with the corresponding
         period of the prior year.

                 (g)      There shall have been furnished to the
         Representatives a certificate, dated the Closing Date and addressed to
         you, signed by the Chief Executive Officer and by the Chief Financial
         Officer of the Company to the effect that:

                          (i)         the representations and warranties of the
                 Company in Section 1 of this Agreement are true and correct,
                 as if made at and as of the Closing Date, and the Company has
                 complied with all the agreements and satisfied all the
                 conditions on its part to be performed or satisfied at or
                 prior to the Closing Date;

                          (ii)        no stop order suspending the
                 effectiveness of the Registration Statement has been issued,
                 and no proceedings for that purpose have been initiated or are
                 pending, or to their knowledge, threatened under the
                 Securities Act;

                          (iii)       all filings required by Rule 424 and Rule
                 430A of the Rules and Regulations have been made;

                          (iv)        they have carefully examined the
                 Registration Statement, the Effective Prospectus and the Final
                 Prospectus, and any amendments or supplements thereto, and
                 such documents do not include any untrue statement of a
                 material fact or omit to state any material fact required to
                 be stated therein or necessary to make the statements therein
                 not misleading; and

                          (v)         since the effective date of the
                 Registration Statement, there has occurred no event required
                 to be set forth in an amendment or supplement to the
                 Registration Statement, the Effective Prospectus or the Final
                 Prospectus which has not been so set forth.



                                       22


<PAGE>   60

                          (h)         Subsequent to the respective dates as of
         which information is given in the Registration Statement and
         the Final Prospectus, and except as stated therein, the Company or its
         subsidiaries have not sustained any material loss or interference with
         their respective business or properties from fire, flood, hurricane,
         accident or other calamity, whether or not covered by insurance, or
         from any labor dispute or any court or governmental action, order or
         decree, or become a party to or the subject of any litigation which is
         material to the Company or its subsidiaries, nor shall there have been
         any material adverse change, or any development involving a
         prospective material adverse change, in the business, properties, key
         personnel, capitalization, prospects, net worth, results of operations
         or condition (financial or other) of the Company and its subsidiaries,
         which loss, interference, litigation or change, in the
         Representatives' reasonable judgment shall render it unadvisable to
         commence or continue the offering of the Shares at the offering price
         to the public set forth on the cover page of the Prospectus or to
         proceed with the delivery of the Shares.

                       (i)      The shares shall be listed on the Nasdaq 
                 National Market.

                 (j)      The Company shall have consummated the transactions
         contemplated by that certain Asset Purchase Agreement dated May 24,
         1996 among Bio-Research, Caisse de Depot et Placement du Quebec, CAI
         Capital Corporation, CAI Capital Partners and Company Limited
         Partnership, CAI Partners and Company Limited Partnership and Ontario
         Teachers' Pension Plan Board and the Company (the "Asset Purchase
         Agreement") on the terms set forth therein.

         All such opinions, certificates, letters and documents delivered
pursuant to this Agreement will comply with the provisions hereof only if they
are reasonably satisfactory to the Representatives and their counsel.  The
Company shall furnish to the Representatives such conformed copies of such
opinions, certificates, letters and documents in such quantities as the
Representatives shall reasonably request.

         The respective obligations of the Underwriters to purchase and pay for
the Option Shares shall be subject, in their discretion, to each of the
foregoing conditions to purchase the Firm Shares, except that all references to
the "Closing Date" shall be deemed to refer to the Option Closing Date, if it
shall be a date other than the Closing Date.

         7.      Condition of the Company's Obligations.  The obligations
hereunder of the Company are subject to the condition set forth in Section 6(a)
hereof.



                                       23


<PAGE>   61

         8.      Indemnification and Contribution.

                 (a)      The Company agrees to indemnify and hold harmless
         each Underwriter, and each person, if any, who controls any
         Underwriter within the meaning of the Securities Act, against any
         losses, claims, damages or liabilities, joint or several, to which
         such Underwriter or controlling person may become subject under the
         Securities Act or otherwise, insofar as such losses, claims, damages
         or liabilities (or actions in respect thereof) arise out of or are
         based in whole or in part upon:

                          (i)         any inaccuracy in the representations and
                 warranties of the Company contained herein;

                          (ii)        any failure of the Company to perform its
                 obligations hereunder or under law;

                          (iii)       any untrue statement or alleged untrue
                 statement of any material fact contained in (A) the
                 Registration Statement, any Preliminary Prospectus, the
                 Effective Prospectus or Final Prospectus, or any amendment or
                 supplement thereto, (B) any audio or visual materials supplied
                 by the Company expressly for use in connection with the
                 marketing of the Shares, including without limitation, slides,
                 videos, films and tape recordings (the "Marketing Materials")
                 or (C) in any Blue Sky application or other written
                 information furnished by the Company filed in any state or
                 other jurisdiction in order to qualify any or all of the
                 Shares under the securities laws thereof (a "Blue Sky
                 Application"); or

                          (iv)        the omission or alleged omission to state
                 in the Registration Statement, any Preliminary Prospectus, the
                 Effective Prospectus or Final Prospectus or any amendment or
                 supplement thereto, any Marketing Materials or Blue Sky
                 Application a material fact required to be stated therein or
                 necessary to make the statements therein not misleading; and
                 will reimburse each Underwriter and each such controlling
                 person for any legal or other expenses reasonably incurred by
                 such Underwriter or such controlling person in connection with
                 investigating or defending any such loss, claim, damage,
                 liability or action as such expenses are incurred; provided,
                 however, that the Company will not be liable in any such case
                 to the extent that any such loss, claim, damage, or liability
                 arises out of or is based upon any untrue statement or alleged
                 untrue statement or omission or alleged omission made in the
                 Registration Statement, the Preliminary Prospectus, the
                 Effective Prospectus or Final Prospectus, or any amendment or
                 supplement thereto, or any Marketing Materials or Blue Sky
                 Application in reliance upon and in conformity with written
                 information furnished to the Company by any Underwriter
                 specifically for use therein (it being understood that the
                 only information so provided is the information included in
                 the last paragraph on the cover page and in the first and
                 third paragraphs under the caption "Underwriting"



                                       24


<PAGE>   62

                 in any Preliminary Prospectus and the Final Prospectus and 
                 the Effective Prospectus).

                 (b)      Each Underwriter will indemnify and hold harmless the
         Company, each of its directors, each of its officers who signed the
         Registration Statement and each person, if any, who controls the
         Company within the meaning of the Securities Act against any losses,
         claims, damages or liabilities to which the Company or any such
         director, officer or controlling person may become subject, under the
         Securities Act or otherwise, insofar as such losses, claims, damages
         or liabilities (or actions in respect thereof) arise out of or are
         based upon any untrue statement or alleged untrue statement of any
         material fact contained in the Registration Statement, any Preliminary
         Prospectus, the Effective Prospectus or Final Prospectus, or any
         amendment or supplement thereto, any Marketing Materials or any Blue
         Sky Application, or arise out of or are based upon the omission or the
         alleged omission to state in the Registration Statement, any
         Preliminary Prospectus, the Effective Prospectus or Final Prospectus,
         or any amendment or supplement thereto, any Marketing Materials or any
         Blue Sky Application a material fact required to be stated therein or
         necessary to make the statements therein not misleading, in each case
         to the extent, but only to the extent, that such untrue statement or
         alleged untrue statement or omission or alleged omission was made in
         reliance upon and in conformity with written information furnished to
         the Company by any Underwriter specifically for use therein (it being
         understood that the only information so provided is the information
         included in the last paragraph on the cover page and in the first and
         third paragraphs under the caption "Underwriting" in any Preliminary
         Prospectus and in the Effective Prospectus and the Final Prospectus);

                 (c)      Promptly after receipt by an indemnified party under
         this Section 8 of notice of the commencement of any action, including
         governmental proceedings, such indemnified party will, if a claim in
         respect thereof is to be made against the indemnifying party under
         this Section 8 notify the indemnifying party of the commencement
         thereof; but the omission so to notify the indemnifying party will not
         relieve it from any liability which it may have to any indemnified
         party otherwise than under this Section 8.  In case any such action is
         brought against any indemnified party, and it notifies the
         indemnifying party of the commencement thereof, the indemnifying party
         will be entitled to participate therein, and to the extent that it may
         wish, jointly with any other indemnifying party similarly notified, to
         assume the defense thereof, with counsel satisfactory to such
         indemnified party; and after notice from the indemnifying party to
         such indemnified party of its election to so assume the defense
         thereof, the indemnifying party will not be liable to such indemnified
         party under this Section 8 for any legal or other expenses
         subsequently incurred by such indemnified party in connection with the
         defense thereof other than reasonable costs of investigation except
         that the indemnified party shall have the right to employ separate
         counsel if, in the indemnified party's reasonable judgment, it is
         advisable for the indemnified party and any other Underwriter to be
         represented by separate counsel,



                                       25
<PAGE>   63

         and in that event the fees and expenses of separate counsel shall be
         paid by the indemnifying party.

                 (d)      In order to provide for just and equitable
         contribution in circumstances in which the indemnity agreement
         provided for in the preceding part of this Section 8 is for any reason
         held to be unavailable to the Underwriters, or the Company or is
         insufficient to hold harmless an indemnified party, then the Company
         shall contribute to the damages paid by the Underwriters, and the
         Underwriters shall contribute to the damages paid by the Company
         provided, however, that no person guilty of fraudulent
         misrepresentation (within the meaning of Section 11(f) of the
         Securities Act) shall be entitled to contribution from any person who
         was not guilty of such fraudulent misrepresentation.  In determining
         the amount of contribution to which the respective parties are
         entitled, there shall be considered the relative benefits received by
         each party from the offering of the Shares (taking into account the
         portion of the proceeds of the offering realized by each), the
         parties' relative knowledge and access to information concerning the
         matter with respect to which the claim was asserted, the opportunity
         to correct and prevent any statement or omission, and any other
         equitable considerations appropriate under the circumstances.  The
         Company, and the Underwriters agree that it would not be equitable if
         the amount of such contribution were determined by pro rata or per
         capita allocation (even if the Underwriters were treated as one entity
         for such purpose).  No Underwriter or person controlling such
         Underwriter shall be obligated to make contribution hereunder which in
         the aggregate exceeds the underwriting discount applicable to the
         Shares purchased by such Underwriter under this Agreement, less the
         aggregate amount of any damages which such Underwriter and its
         controlling persons have otherwise been required to pay in respect of
         the same or any similar claim.  The Underwriters' obligations to
         contribute hereunder are several in proportion to their respective
         underwriting obligations and not joint.  For purposes of this Section,
         each person, if any, who controls an Underwriter within the meaning of
         Section 15 of the Securities Act shall have the same rights to
         contribution as such Underwriter, and each director of the Company,
         each officer of the Company who signed the Registration Statement, and
         each person, if any, who controls the Company within the meaning of
         Section 15 of the Securities Act, shall have the same rights to
         contribution as the Company.

                 (e)      No indemnifying party shall, without the prior
         written consent of the indemnified party, effect any settlement of any
         pending or threatened action, suit or proceeding in respect of which
         any indemnified party is a party or is (or would be, if a claim were
         to be made against such indemnified party) entitled to indemnity
         hereunder, unless such settlement includes an unconditional release of
         such indemnified party from all liability on claims that are the
         subject matter of such action, suit or proceeding.

                 (f)      The obligations of  the Company under this Section 8
         shall be in addition to any liability which the Company may otherwise
         have and shall extend, upon the same terms and conditions, to each
         person, if any, who controls any Underwriter within the



                                       26


<PAGE>   64

         meaning of the Securities Act; and the obligations of the Underwriters
         under this Section 8 shall be in addition to any liability which the
         respective Underwriters may otherwise have and shall extend, upon the
         same terms and conditions, to each officer and director of the Company
         and to each person, if any, who controls the Company within the
         meaning of the Securities Act.

         9.      Default of Underwriters.  If any Underwriter defaults in its
obligation to purchase Shares hereunder and if the total number of Shares which
such defaulting Underwriter agreed but failed to purchase is ten percent or
less of the total number of Shares to be sold hereunder, the non-defaulting
Underwriters shall be obligated severally to purchase (in the respective
proportions which the number of Shares set forth opposite the name of each
non-defaulting Underwriter in Schedule I hereto bears to the total number of
Shares set forth opposite the names of all the non- defaulting Underwriters),
the Shares which such defaulting Underwriter or Underwriters agreed but failed
to purchase.  If any Underwriter so defaults and the total number of Shares
with respect to which such default or defaults occur is more than ten percent
of the total number of Shares to be sold hereunder, and arrangements
satisfactory to the other Underwriters and the Company for the purchase of such
Shares by other persons (who may include the non-defaulting Underwriters) are
not made within 36 hours after such default, this Agreement, insofar as it
relates to the sale of the Shares, will terminate without liability on the part
of the non-defaulting Underwriters or the Company except for (i) the provisions
of Section 8 hereof, and (ii) the expenses to be paid or reimbursed by the
Company pursuant to Section 5.  As used in this Agreement, the term
"Underwriter" includes any person substituted for an Underwriter under this
Section 9.  Nothing herein shall relieve a defaulting Underwriter from
liability for its default.

         10.     Survival Clause.  The respective representations, warranties,
agreements, covenants, indemnities and other statements of  the Company, its
officers and the Underwriters set forth in this Agreement or made by or on
behalf of them, respectively, pursuant to this Agreement shall remain in full
force and effect, regardless of (a) any investigation made by or on behalf of
the Company, any of its officers or directors, any Underwriter or any
controlling person, (b) any termination of this Agreement and (c) delivery of
and payment for the Shares.

         11.     Effective Date.  This Agreement shall become effective at
whichever of the following times shall first occur:  (i) at 11:30 A.M.,
Washington, D.C. time, on the next full business day following the date on
which the Registration Statement becomes effective or (ii) at such time after
the Registration Statement has become effective as the Representatives shall
release the Firm Shares for sale to the public; provided, however, that the
provisions of Sections 5, 8 and 10 hereof shall at all times be effective. For
purposes of this Section 11, the Firm Shares shall be deemed to have been so
released upon the release by the Representatives for publication, at any time
after the Registration Statement has become effective, of any newspaper
advertisement relating to the Firm Shares or upon the release by the
Representatives of telegrams offering the Firm Shares for sale to securities
dealers, whichever may occur first.



                                       27


<PAGE>   65

         12.     Termination.

                 (a)      The Company's obligations under this Agreement may be
         terminated by the Company by notice to the Representatives (i) at any
         time before it becomes effective in accordance with Section 11 hereof,
         or (ii) in the event that the condition set forth in Section 7 shall
         not have been satisfied at or prior to the First Closing Date.

                 (b)      This Agreement may be terminated by the
         Representatives by notice to the Company (i) at any time before it
         becomes effective in accordance with Section 11 hereof; (ii) in the
         event that at or prior to the First Closing Date the Company shall
         have failed, refused or been unable to perform any agreement on the
         part of the Company to be performed hereunder or any other condition
         to the obligations of the Underwriters hereunder is not fulfilled;
         (iii) if at or prior to the Closing Date trading in securities on the
         Nasdaq National Market, the American Stock Exchange or the
         over-the-counter market shall have been suspended or materially
         limited or minimum or maximum prices shall have been established on
         either of such exchanges or such market, or a banking moratorium shall
         have been declared by Federal or state authorities; (iv) if at or
         prior to the Closing Date trading in securities of the Company shall
         have been suspended; or (v) if there shall have been such a material
         adverse change in general economic, political or financial conditions
         or if the effect of international conditions on the financial markets
         in the United States shall be such as, in your reasonable judgment,
         makes it inadvisable to commence or continue the offering of the
         Shares at the offering price to the public set forth on the cover page
         of the Prospectus or to proceed with the delivery of the Shares.

                 (c)      Termination of this Agreement pursuant to this
         Section 12 shall be without liability of any party to any other party
         other than as provided in Sections 5 and 8 hereof.

         13.     Notices.  All communications hereunder shall be in writing
and, if sent to any of the Underwriters, shall be mailed or delivered or
telegraphed and confirmed in writing to the Representatives in care of J. C.
Bradford & Co., L.L.C., J. C. Bradford Financial Center, 330 Commerce Street,
Nashville, Tennessee 37201, Attention: Robert S.  Doolittle, or if sent to the
Company shall be mailed, delivered or telegraphed and confirmed in writing to
the Company at One Burton Hills Boulevard, Suite 210, Nashville, Tennessee
37215, Attention: William C. O'Neil, Jr.

         14.     Miscellaneous.  This Agreement shall inure to the benefit of
and be binding upon the several Underwriters, the Company and their respective
successors and legal representatives.  Nothing expressed or mentioned in this
Agreement is intended or shall be construed to give any other person any legal
or equitable right, remedy or claim under or in respect of this Agreement.
This Agreement and all conditions and provisions hereof are intended to be for
the sole and exclusive benefit of the Company and the several Underwriters and
for the benefit of no other person except that (a) the representations and
warranties of the Company and contained in this Agreement shall also be for the
benefit of any person or persons who control any Underwriter



                                       28
<PAGE>   66

within the meaning of Section 15 of the Securities Act, and (b) the indemnities
by the Underwriters shall also be for the benefit of the directors of the 
Company, officers of the Company who have signed the Registration Statement 
and any person or persons who control the Company within the meaning
of Section 15 of the Securities Act.  No purchaser of Shares from any
Underwriter will be deemed a successor because of such purchase.  The validity
and interpretation of this Agreement shall be governed by the laws of the State
of Tennessee. This Agreement may be executed in two or more counterparts, each
of which shall be deemed an original, but all of which together shall
constitute one and the same instrument.  The Representatives hereby represent
and warrant to the Company that the Representatives have authority to act
hereunder on behalf of the several Underwriters, and any action hereunder taken
by the Representatives will be binding upon all the Underwriters.

                 If the foregoing is in accordance with your understanding of
our agreement, please indicate your acceptance thereof in the space provided
below for that purpose, whereupon this letter shall constitute a binding
agreement between the Company, and each of the several Underwriters.

                               Very truly yours,

                                        CLINTRIALS RESEARCH INC.

                                        By:
                                           ------------------------------------
                                        Title:
                                              ---------------------------------
                                                 

Confirmed and accepted as of the
date first above written.

J.C. BRADFORD & CO., L.L.C.
PIPER JAFFRAY INC.
SMITH BARNEY INC.
For themselves and as
Representatives of the Several
Underwriters

By:
   ----------------------------------------
         Partner



                                       29


<PAGE>   67








                                   SCHEDULE I

                                  UNDERWRITERS


<TABLE>
<CAPTION>
                                                                    Number of
                                                                  Firm Shares to
 Underwriter                                                       Be Purchased
 -----------                                                      -------------
<S>                                                               <C>
 J.C. Bradford & Co., L.L.C.   . . . . . . . . . . .                 
                                                                     
 Piper Jaffray Inc.  . . . . . . . . . . . . . . . .                 

 Smith Barney Inc  . . . . . . . . . . . . . . . . .                 
                                                                     

















                                                                  -------------
                                                         TOTAL       2,600,000
       
                                                                  =============
</TABLE>
<PAGE>   68
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        -----
<S>                                                                                     <C>
BIO-RESEARCH LABORATORIES LTD. FINANCIAL STATEMENTS
Report of Independent Auditors........................................................    F-2
Balance Sheets as of December 31, 1994 and 1995; and March 31, 1996
  (unaudited).........................................................................    F-3
Statements of Income for the years ended December 31, 1993, 1994 and 1995; and for the
  three months ended March 31, 1995 and 1996 (unaudited)..............................    F-4
Statements of Stockholders' Equity for the years ended December 31, 1993, 1994 and
  1995; and for the three months ended March 31, 1995 and 1996 (unaudited)............    F-5
Statements of Cash Flows for the years ended December 31, 1993, 1994 and 1995; and for
  the three months ended March 31, 1995 and 1996 (unaudited)..........................    F-6
Notes to Financial Statements.........................................................    F-7
CLINTRIALS RESEARCH INC. UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
Unaudited Pro Forma Condensed Combined Balance Sheet as of March 31, 1996.............   F-14
Notes to Unaudited Pro Forma Condensed Combined Balance Sheet.........................   F-15
Unaudited Pro Forma Condensed Combined Statements of Income for the three months ended
  March 31, 1996 and year ended December 31, 1995.....................................   F-16
Notes to Unaudited Pro Forma Condensed Combined Statements of Income..................   F-18
</TABLE>
 
                                       F-1
<PAGE>   69
 
                         REPORT OF INDEPENDENT AUDITORS
 
Board of Directors and Stockholders
ClinTrials Research Inc.
 
     We have audited the accompanying balance sheets of Bio-Research
Laboratories Ltd. as of December 31, 1995 and 1994, and the related statements
of income, stockholders' equity, and cash flows for each of the three years in
the period ended December 31, 1995. 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 the 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 Bio-Research Laboratories
Ltd. at December 31, 1995 and 1994, and the results of operations and cash flows
for each of the three years in the period ended December 31, 1995, in conformity
with generally accepted accounting principles.
 
                                          Ernst & Young LLP
 
Nashville, Tennessee
 
February 6, 1996,
  except for Note 12, as to which the date is
  May 24, 1996
 
                                       F-2
<PAGE>   70
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                                 BALANCE SHEETS
                (ALL DOLLAR AMOUNTS ARE EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,        MARCH 31,
                                                               ------------------        1996
                                                                1994       1995      ------------
                                                               -------    -------    (UNAUDITED --
                                                                                       NOTE 13)
<S>                                                            <C>        <C>        <C>
                                             ASSETS
Current assets:
  Cash and cash equivalents.................................   $ 4,172    $ 5,699      $  5,548
  Accounts receivable.......................................     7,553      8,598         6,913
  Tax credits receivable....................................     2,536      1,136         1,331
  Other current assets......................................       620        676         1,422
                                                               -------    -------    ------------
          Total current assets..............................    14,881     16,109        15,214
Property and equipment:
  Land......................................................       303        312           312
  Buildings.................................................    13,407     13,918        14,154
  Equipment.................................................    12,734     13,742        13,973
                                                               -------    -------    ------------
                                                                26,444     27,972        28,439
  Less accumulated depreciation.............................    10,049     11,238        11,639
                                                               -------    -------    ------------
                                                                16,395     16,734        16,800
Other assets................................................       149        238            --
                                                               -------    -------    ------------
          Total assets......................................   $31,425    $33,081      $ 32,014
                                                               =======    =======    ==========
                              LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................   $ 3,728    $ 3,365      $  2,543
  Advance billings..........................................     1,887      2,940         2,189
  Other current liabilities.................................       603        633           649
                                                               -------    -------    ------------
          Total current liabilities.........................     6,218      6,938         5,381
Stockholders' equity:
  Common Stock, no par value -- unlimited shares authorized;
     issued and outstanding 11,466,280 shares in 1994, 1995
     and 1996, respectively.................................     3,128      3,128         3,128
  Additional paid-in capital................................        39         39            39
  Retained earnings.........................................    24,225     24,403        24,941
  Cumulative foreign currency translation adjustments.......    (2,185)    (1,427)       (1,475)
                                                               -------    -------    ------------
          Total stockholders' equity........................    25,207     26,143        26,633
                                                               -------    -------    ------------
          Total liabilities and stockholders' equity........   $31,425    $33,081      $ 32,014
                                                               =======    =======    ==========
</TABLE>
 
                            See accompanying notes.
 
                                       F-3
<PAGE>   71
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                              STATEMENTS OF INCOME
                (ALL DOLLAR AMOUNTS ARE EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    THREE MONTHS
                                                     YEAR ENDED DECEMBER 31,       ENDED MARCH 31,
                                                   ---------------------------     ---------------
                                                    1993      1994      1995        1995     1996
                                                   -------   -------   -------     ------   ------
                                                                                    (UNAUDITED --
                                                                                      NOTE 13)
<S>                                                <C>       <C>       <C>         <C>      <C>
Service revenue..................................  $22,418   $24,504   $26,342     $7,379   $6,324
Operating costs and expenses:
  Direct costs...................................   12,942    13,184    14,408      3,536    3,658
  Selling, general and administrative expenses...    7,176     7,804     8,024      2,135    1,954
  Depreciation...................................    1,141     1,347     1,573        437      426
                                                   -------   -------   -------     ------   ------
Income from operations...........................    1,159     2,169     2,337      1,271      286
Other income (expense):
  Interest income................................      110       139       325        100       75
  Other income...................................       69        72        48          8        2
  Interest expense...............................      (47)      (31)      (10)        (2)      (1)
                                                   -------   -------   -------     ------   ------
                                                       132       180       363        106       76
                                                   -------   -------   -------     ------   ------
Income before income taxes.......................    1,291     2,349     2,700      1,377      362
Provision for income taxes.......................   (1,117)   (1,100)   (1,026)      (202)    (176)
                                                   -------   -------   -------     ------   ------
Net income.......................................  $ 2,408   $ 3,449   $ 3,726     $1,579   $  538
                                                   =======   =======   =======     ======   ======
</TABLE>
 
                            See accompanying notes.
 
                                       F-4
<PAGE>   72
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                       STATEMENTS OF STOCKHOLDERS' EQUITY
                (ALL DOLLAR AMOUNTS ARE EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                     CUMULATIVE
                                                                                       FOREIGN
                                          COMMON STOCK       ADDITIONAL               CURRENCY
                                       -------------------    PAID-IN     RETAINED   TRANSLATION
                                         SHARES     AMOUNT    CAPITAL     EARNINGS   ADJUSTMENTS    TOTAL
                                       ----------   ------   ----------   --------   -----------   -------
<S>                                    <C>          <C>      <C>          <C>        <C>           <C>
Balance at January 1, 1993...........  11,466,280   $3,128      $ 39      $ 18,368     $(1,266)    $20,269
  Foreign currency translation
     adjustments.....................          --       --        --                       451         451
  Net income.........................          --       --        --         2,408          --       2,408
                                       ----------   ------       ---      --------   -----------   -------
Balance at December 31, 1993.........  11,466,280    3,128        39        20,776        (815)     23,128
  Foreign currency translation
     adjustments.....................          --       --        --                    (1,370)     (1,370)
  Net income.........................          --       --        --         3,449          --       3,449
                                       ----------   ------       ---      --------   -----------   -------
Balance at December 31, 1994.........  11,466,280    3,128        39        24,225      (2,185)     25,207
  Foreign currency translation
     adjustments.....................          --       --        --                       758         758
  Payment of dividend................          --       --        --        (3,548)         --      (3,548)
  Net income.........................          --       --        --         3,726          --       3,726
                                       ----------   ------       ---      --------   -----------   -------
Balance at December 31, 1995
  (Unaudited -- Note 13).............  11,466,280    3,128        39        24,403      (1,427)     26,143
  Foreign currency translation
     adjustments.....................          --       --        --            --         (48)        (48)
  Net income.........................          --       --        --           538          --         538
                                       ----------   ------       ---      --------   -----------   -------
Balance at March 31, 1996
  (Unaudited -- Note 13).............  11,466,280   $3,128      $ 39      $ 24,941     $(1,475)    $26,633
                                        =========   ======   =======       =======   =========     =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-5
<PAGE>   73
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                            STATEMENTS OF CASH FLOWS
                (ALL DOLLAR AMOUNTS ARE EXPRESSED IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                    THREE MONTHS
                                                                                       ENDED
                                                      YEAR ENDED DECEMBER 31,        MARCH 31,
                                                    ---------------------------   ----------------
                                                     1993      1994      1995      1995      1996
                                                    -------   -------   -------   -------   ------
                                                                                   (UNAUDITED --
                                                                                      NOTE 13)
<S>                                                 <C>       <C>       <C>       <C>       <C>
CASH FLOWS FROM OPERATING ACTIVITIES
Net income........................................  $ 2,408   $ 3,449   $ 3,726   $ 1,579   $  538
Adjustments to reconcile net income to net cash
  provided by operating activities:
  Depreciation....................................    1,141     1,347     1,573       437      426
  Changes in operating assets and liabilities:
     Accounts receivable..........................   (1,544)     (230)   (1,045)       (6)   1,685
     Advance billings.............................    1,140      (163)    1,053      (814)    (751)
     Accounts payable.............................      884       886      (363)     (750)    (822)
     Taxes receivable.............................      425    (1,202)    1,400       809     (195)
     Other current assets.........................       (6)       11       (56)     (298)    (746)
     Other current liabilities....................       71      (310)       30       155       16
     Other assets.................................       --      (149)      (89)      149      238
                                                    -------   -------   -------   -------   ------
          Net cash provided by operating
            activities............................    4,519     3,639     6,229     1,261      389
CASH FLOWS FROM INVESTING ACTIVITY
Purchases of property and equipment, net..........   (1,831)   (2,217)   (1,912)     (253)    (492)
CASH FLOWS FROM FINANCING ACTIVITY
Payment of dividend...............................  $    --   $    --   $(3,548)  $    --   $   --
Effect of exchange rate changes on cash...........      451    (1,370)      758        54      (48)
                                                    -------   -------   -------   -------   ------
Increase (decrease) in cash and cash
  equivalents.....................................    3,139        52     1,527     1,062     (151)
Cash and cash equivalents at beginning of
  period..........................................      981     4,120     4,172     4,172    5,699
                                                    -------   -------   -------   -------   ------
Cash and cash equivalents at end of period........  $ 4,120   $ 4,172   $ 5,699   $ 5,234   $5,548
                                                    =======   =======   =======   =======   ======
Supplemental cash flow information:
  Interest paid...................................  $    47   $    31   $    10   $     2   $    1
                                                    =======   =======   =======   =======   ======
  Income tax payments (refunds)...................  $(1,930)  $   280   $(2,480)  $(1,182)  $   --
                                                    =======   =======   =======   =======   ======
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   74
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                         NOTES TO FINANCIAL STATEMENTS
                               DECEMBER 31, 1995
 
1.  ORGANIZATION
 
     Bio-Research Laboratories Ltd. ("Bio-Research"), located in Montreal,
Quebec, Canada, is an independent contract research laboratory providing
preclinical research services to clients in the pharmaceutical, biotechnology,
chemical and medical device industries, primarily serving the United States, the
Far East, Europe and Canada.
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
TRANSLATION OF FINANCIAL STATEMENTS INTO U.S. DOLLARS
 
     The functional currency of Bio-Research is Canadian dollars. Assets and
liabilities amounts of Bio-Research are translated into U.S. dollars at the
year-end rate of exchange, and the income statements amounts are translated at
the average rates of exchange for the period. Gains or losses from translating
financial statements are accumulated in a separate component of stockholders'
equity.
 
     Bio-Research enters into forward exchange contracts with banks to hedge
foreign currency transactions, and not to engage in currency speculation. Gains
and losses on forward exchange contracts to hedge future transactions are
deferred and accounted for as part of the cost of these transactions.
 
CASH AND CASH EQUIVALENTS
 
     For the purpose of the statement of cash flows, cash and cash equivalents
include demand deposits and money market accounts held with a financial
institution. Bio-Research considers all highly liquid investments with a
maturity of three months or less when purchased to be cash equivalents.
 
REVENUE RECOGNITION
 
     Revenue from contracts is recorded as costs are incurred and includes
estimated earned fees or profits calculated on the basis of the relationship
between costs incurred and total estimated costs (cost-to-cost type of
percentage-of-completion method of accounting). Certain contracts contain
provisions for price redetermination for cost overruns. Such redetermined
amounts are included in service revenue when realization is assured and the
amounts can reasonably be determined. Estimated amounts representing contract
change orders, claims or funding limitations are included in service revenue
only when realization is probable. In the period in which it is determined that
a loss will result from the performance of a contract, the entire amount of the
estimated ultimate loss is charged against income. Other changes in estimates of
service revenue, costs and profits are recognized using the cumulative catch-up
method of accounting. This method recognizes in the current period the
cumulative effect of the changes on current and prior periods. Hence, the effect
of the changes on future periods of contract performance is recognized as if the
revised estimates had been the original estimates.
 
UNBILLED RECEIVABLES AND ADVANCE BILLINGS
 
     Unbilled receivables arise from those contracts under which billings can
only be rendered upon the achievement of certain negotiated performance
requirements or on a date-certain basis. Advance billings represent contractual
prebillings for services not yet rendered.
 
PROPERTY AND EQUIPMENT
 
     Property and equipment is stated at cost.
 
     Depreciation is provided on the straight-line method over the estimated
useful lives of the respective properties, which approximate three to forty
years.
 
                                       F-7
<PAGE>   75
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
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 amounts reported in the financial statements and
accompanying notes. Actual results could differ from those estimates.
 
NEWLY ISSUED ACCOUNTING STANDARDS
 
     Bio-Research has considered the impact of newly issued financial accounting
pronouncements, principally Statement of Financial Accounting Standards No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
Be Disposed Of," and does not believe that adoption of this and any other newly
issued pronouncements would have a significant impact on Bio-Research's
financial statements.
 
3.  ACCOUNTS RECEIVABLE
 
     Accounts receivable consisted of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                           ---------------
                                                                            1994     1995
                                                                           ------   ------
    <S>                                                                    <C>      <C>
    Trade:
      Billed.............................................................  $4,618   $5,491
      Unbilled...........................................................   2,969    2,657
      Reserve for doubtful accounts......................................    (814)     (73)
                                                                           ------   ------
                                                                            6,773    8,075
    Other................................................................     780      523
                                                                           ------   ------
                                                                           $7,553   $8,598
                                                                           ======   ======
</TABLE>
 
4.  UNBILLED RECEIVABLES AND ADVANCE BILLINGS
 
     Unbilled receivables and advance billings on contracts were as follows (in
thousands):
 
<TABLE>
<CAPTION>
                                                                          DECEMBER 31,
                                                                       -------------------
                                                                         1994       1995
                                                                       --------   --------
    <S>                                                                <C>        <C>
    Gross revenue recognized on uncompleted projects.................  $ 17,691   $ 19,580
    Less billings to date............................................   (16,609)   (19,863)
                                                                       --------   --------
                                                                       $  1,082   $   (283)
                                                                       ========   ========
    Included in accompanying balance sheets under the following
      captions:
      Accounts receivable............................................  $  2,969   $  2,657
      Advance billings...............................................    (1,887)    (2,940)
                                                                       --------   --------
                                                                       $  1,082   $   (283)
                                                                       ========   ========
</TABLE>
 
5.  LONG-TERM DEBT
 
     Bio-Research has a credit facility in the amount of up to the lesser of
$3.7 million or the sum of 75% of trade accounts receivable and 25% of unbilled
receivables. On December 31, 1994 and 1995, there were no amounts outstanding on
the above credit facility.
 
     Interest on any outstanding portion of the credit facility is at the bank's
prime lending rate (8.5% at December 31, 1995). The credit facility is
collateralized by all accounts receivable of Bio-Research.
 
     At December 31, 1994 and 1995, Bio-Research was in compliance with all
covenants of the credit facility.
 
                                       F-8
<PAGE>   76
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
6.  OPERATING LEASES
 
     Bio-Research leases various equipment items under operating leases.
 
     Minimum rental commitments payable in future years under operating leases
having an initial or remaining noncancelable term of one year or more are as
follows (in thousands):
 
<TABLE>
    <S>                                                                             <C>
    1996..........................................................................  $201
    1997..........................................................................   198
    1998..........................................................................   183
    1999..........................................................................   161
    2000..........................................................................   161
                                                                                    ----
              Total minimum rentals...............................................  $903
                                                                                    ====
</TABLE>
 
     Total rent expense for all operating leases was approximately $210,000,
$211,000 and $182,000 for the years ended December 31, 1993, 1994 and 1995,
respectively.
 
7.  INCOME TAXES
 
     Significant components of Bio-Research's deferred tax liabilities and
assets as of December 31, 1994 and 1995 are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                           DECEMBER 31,
                                                                         -----------------
                                                                          1994      1995
                                                                         -------   -------
    <S>                                                                  <C>       <C>
    Deferred tax assets:
      Research and development credit carryforward.....................  $10,592   $10,036
      Undeducted research and development expenditures.................    1,854     2,328
    Other..............................................................      399       327
                                                                         -------   -------
              Total deferred tax assets................................   12,845    12,691
    Valuation allowance for deferred tax assets........................   (6,868)   (6,758)
                                                                         -------   -------
    Net deferred tax assets............................................    5,977     5,933
    Deferred tax liability:
      Depreciation and amortization....................................   (5,487)   (5,778)
      Other............................................................     (490)     (155)
                                                                         -------   -------
              Net deferred tax assets..................................  $    --   $    --
                                                                         =======   =======
</TABLE>
 
     At December 31, 1995, Bio-Research had unrealized research and development
tax credits, net of income tax effect, of $10,036. These credits expire in years
1997 through 2005. For financial reporting purposes, a valuation allowance of
$6,758 has been recognized to offset the deferred tax assets related to those
carryforwards. The net deferred tax asset reflects a decrease in the valuation
allowance of approximately $110.
 
     Significant components of the provision for income taxes attributable to
income before income taxes, extraordinary item and cumulative effect of
accounting change are as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,
                                                                ---------------------------
                                                                 1993      1994      1995
                                                                -------   -------   -------
    <S>                                                         <C>       <C>       <C>
    Current:
      Federal.................................................  $   314   $    73   $    --
      Provincial..............................................   (1,431)   (1,173)   (1,026)
    Deferred..................................................       --        --        --
                                                                -------   -------   -------
    Provision for income taxes................................  $(1,117)  $(1,100)  $(1,026)
                                                                =======   =======   =======
</TABLE>
 
                                       F-9
<PAGE>   77
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     Bio-Research's effective tax rate differed from the federal statutory rate
in Canada as set forth below (in thousands):
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31,
                                                                ---------------------------
                                                                 1993      1994      1995
                                                                -------   -------   -------
    <S>                                                         <C>       <C>       <C>
    Federal statutory rate....................................  $   372   $   677   $   785
    Provincial income taxes...................................      151       322       246
    Federal Research & Development Tax Credit, net of taxes...     (419)   (1,203)     (987)
    Quebec Research & Development Tax Credit, net of taxes....   (1,075)     (970)     (917)
    Other.....................................................     (146)       74      (153)
                                                                -------   -------   -------
                                                                $(1,117)  $(1,100)  $(1,026)
                                                                =======   =======   =======
</TABLE>
 
8.  STOCK OPTION PLAN
 
     During 1992, Bio-Research adopted a stock option plan for certain key
employees and outside directors to purchase common shares. The options issued
under this plan vest over a period of five years for key employees and over a
period of three years for outside directors.
 
     The 1992 Stock Option Plan provides for the grant of options to purchase up
to 802,640 shares of Common Stock to directors, officers and other key persons.
 
     Information with respect to the 1992 Stock Option Plan is as follows:
 
<TABLE>
<CAPTION>
                                                     1993             1994             1995
                                                --------------   --------------   --------------
    <S>                                         <C>              <C>              <C>
    Options outstanding at January 1..........         599,820          634,820          664,820
      Granted.................................          35,000           30,000           55,500
      Exercised...............................              --               --               --
      Canceled................................              --               --               --
                                                --------------   --------------   --------------
    Outstanding at December 31................         634,820          664,820          720,320
                                                  ============     ============     ============
    Option price range at December 31.........  $2.04 to $2.97   $2.04 to $2.97   $2.04 to $5.23
                                                  ============     ============     ============
    Options exercisable at December 31........         153,455          281,669          448,674
                                                  ============     ============     ============
</TABLE>
 
     At December 31, 1993, 1994 and 1995, there were 167,820, 137,820 and 82,320
shares, respectively, available for grant.
 
9.  EMPLOYEE BENEFITS
 
     Bio-Research sponsors various noncontributory defined benefit plans
covering substantially all employees, including plans covering executive
administrative employees and all executive administrative employees who are
covered by a special top-hat pension agreement. Pension plan benefits are based
primarily on participants' compensation and years of service. Total pension
expense for 1993, 1994 and 1995 was approximately $278,000, $281,000 and
$167,000, respectively, and consists of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                     1993    1994    1995
                                                                     -----   -----   -----
    <S>                                                              <C>     <C>     <C>
    Service cost on benefits earned during the year................  $ 253   $ 246   $ 197
    Interest cost on projected benefit obligation..................    244     266     246
    Actual return on plan assets...................................   (217)   (228)   (261)
    Net amortization and deferral..................................     (2)     (3)    (15)
                                                                     -----   -----   -----
                                                                     $ 278   $ 281   $ 167
                                                                     =====   =====   =====
</TABLE>
 
                                      F-10
<PAGE>   78
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
     The actuarial present value of benefit obligations and funded status for
Bio-Research's defined benefit plans were as follows (in thousands):
 
<TABLE>
<CAPTION>
                                                                            1994     1995
                                                                           ------   ------
    <S>                                                                    <C>      <C>
    Projected benefit obligation.........................................  $3,425   $3,627
    Plan assets at fair value............................................   3,119    3,799
                                                                           ------   ------
    Projected benefit obligation (in excess) less than plan assets.......    (306)     172
    Unrecognized net loss (gain).........................................      54     (389)
    Unrecognized net transition obligation...............................    (302)    (277)
    Unrecognized prior service cost......................................     305      287
                                                                           ------   ------
    Net pension liability................................................  $ (249)  $ (207)
                                                                           ======   ======
</TABLE>
 
     Assumptions used in developing the projected benefit obligation as of
December 31 were as follows:
 
<TABLE>
<CAPTION>
                                                                        1993    1994    1995
                                                                        ----    ----    ----
    <S>                                                                 <C>     <C>     <C>
    Discount rate.....................................................  8.0 %   8.0 %   8.0 %
    Rate of increase in compensation..................................  6.5 %   6.5 %   5.0 %
    Rate of return on plan assets.....................................  8.0 %   8.0 %   8.0 %
</TABLE>
 
10.  MAJOR CLIENTS
 
     For the year ended December 31, 1993, one client accounted for 12% of
Bio-Research's service revenue. No single client accounted for more than 10% of
Bio-Research's service revenue for the year ended 1994 or 1995.
 
11.  COMMITMENTS AND CONTINGENCIES
 
     During 1995, Bio-Research entered into foreign exchange contracts to
deliver United States currency for the purpose of hedging its United States
currency cash flow. These contracts call for the delivery of $750,000 United
States Dollars per month for the period January 1996 through January 1997 at
exchange rates averaging $1.3821 Canadian Dollar per United States Dollar.
 
     During 1993, Bio-Research undertook a project to upgrade its computer
systems, which it expects to implement in phases through 1997 at a cost of
approximately $4.8 million. Approximately $2.6 million of this amount was
incurred as of December 31, 1995.
 
     In 1991, a customer commenced legal action against Bio-Research claiming
damages in the amount of $5.2 million, plus interest and costs, resulting from
statistical errors in carrying out two clinical research studies. An amount of
$220,000 has been provided for in the accounts with respect to this claim. Based
on applicable insurance coverage and an indemnification agreement from a former
stockholder in favor of Bio-Research in respect of any liability in excess of
the amount provided for, management is of the opinion that the outcome of this
matter will not have any further impact upon the financial position of
Bio-Research.
 
     Also, in the ordinary course of business, Bio-Research is involved in
certain claims and litigation. Management is of the opinion, based on
information presently available to it, that the eventual outcome of these
matters will not have a material adverse effect upon the financial position of
Bio-Research.
 
12.  SUBSEQUENT EVENT
 
     On May 24, 1996, Bio-Research announced the signing of a definitive
agreement to sell the assets of Bio-Research to ClinTrials Research Inc., a
Nashville, Tennessee based clinical research organization, for approximately $65
million plus the assumption of certain liabilities.
 
                                      F-11
<PAGE>   79
 
                         BIO-RESEARCH LABORATORIES LTD.
 
                  NOTES TO FINANCIAL STATEMENTS -- (CONTINUED)
 
13.  UNAUDITED INTERIM FINANCIAL INFORMATION
 
     The balance sheet as of March 31, 1996, the related statements of income
and cash flows for the three months ended March 31, 1995 and 1996, and the
statement of stockholders' equity for the three months ended March 31, 1996
(interim financial statements) have been prepared by Bio-Research and are
unaudited. The interim financial statements include all adjustments consisting
of only normal recurring adjustments necessary for a fair statement of the
results of the interim periods.
 
     Certain information and footnote disclosures normally included in financial
statements prepared in accordance with generally accepted accounting principles
have been condensed or omitted from the interim financial statements. The
interim financial statements should be read in conjunction with Bio-Research's
December 31, 1995 audited financial statements appearing herein. The results for
the three months ended March 31, 1996 may not be indicative of operating results
for the full year.
 
                                      F-12
<PAGE>   80
 
                            CLINTRIALS RESEARCH INC.
 
          UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS
 
     The unaudited pro forma condensed combined statements of income for the
year ended December 31, 1995 and for the three months ended March 31, 1996 gives
effect to the Acquisition as if it had occurred on January 1, 1995. The
unaudited pro forma condensed combined balance sheet as of March 31, 1996, gives
effect to the Acquisition as if it had occurred on March 31, 1996.
 
     The unaudited pro forma condensed combined financial statements give effect
only to the reclassifications and adjustments set forth in the accompanying
Notes to unaudited pro forma condensed combined financial statements. The pro
forma financial information is provided as additional information only and is
not necessarily indicative of actual results that would have been achieved had
the Acquisition been consummated at the beginning of the periods presented or of
future results.
 
     These statements have been prepared from the consolidated financial
statements of the Company and the financial statements of Bio-Research and
should be read in conjunction with such statements and the related Notes. The
financial statements of Bio-Research are included elsewhere herein. The
consolidated financial statements of the Company are incorporated herein by
reference. See "Incorporation of Certain Documents By Reference."
 
                                      F-13
<PAGE>   81
 
                            CLINTRIALS RESEARCH INC.
 
              UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET
                             (DOLLARS IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                 MARCH 31, 1996
                              -------------------------------------------------------------------------------------
                                                            PRO FORMA                    PRO FORMA
                                                           ADJUSTMENTS                  ADJUSTMENTS
                              AS REPORTED   AS REPORTED    TO REFLECT                   TO REFLECT        COMBINED
                              CLINTRIALS    BIO-RESEARCH   ACQUISITION       SUBTOTAL    OFFERING         PRO FORMA
                              -----------   ------------   -----------       --------   -----------       ---------
<S>                           <C>           <C>            <C>               <C>        <C>               <C>
Assets
Current assets:
  Cash and cash
    equivalents.............    $16,831       $  5,548      $      --        $ 22,379    $  74,051(2)     $ 31,430
                                                                                           (65,000)(2)
  Accounts receivable.......     25,407          6,913                         32,320                       32,320
  Other current assets......      4,515          2,753                          7,268                        7,268
                              -----------   ------------   -----------       --------   -----------       ---------
Total current assets........     46,753         15,214                         61,967        9,051          71,018
  Property and equipment....     13,387         28,439                         41,826                       41,826
  Less accumulated
    depreciation and
    amortization............      5,491         11,639                         17,130                       17,130
                              -----------   ------------   -----------       --------   -----------       ---------
                                  7,896         16,800                         24,696                       24,696
Excess of purchase price
  over net assets
  acquired..................      6,965                        38,367(1)       45,332                       45,332
Other assets................         38                                            38                           38
                              -----------   ------------   -----------       --------   -----------       ---------
                                $61,652       $ 32,014      $  38,367        $132,033    $   9,051        $141,084
                              ===========   ============   ===========       =========  ===========       =========
Liabilities and
  Stockholders' Equity
Current liabilities:
  Accounts payable and
    accrued expenses........    $ 8,143       $  3,192      $      --        $ 11,335    $      --        $ 11,335
  Advance billings..........     21,167          2,189                         23,356                       23,356
  Payable to stockholders of
    Bio-Research............                                   65,000(1)       65,000      (65,000)(2)          --
                              -----------   ------------   -----------       --------   -----------       ---------
Total current liabilities...     29,310          5,381         65,000          99,691      (65,000)         34,691
Deferred income taxes.......        234                                           234                          234
Stockholders' equity:
  Common stock..............         88          3,128         (3,128)(1)          88           26(2)          114
  Additional paid-in
    capital.................     40,180             39            (39)(1)      40,180       74,025(2)      114,205
  Retained earnings.........     (8,229)        24,941        (24,941)(1)      (8,229)                      (8,229 )
  Cumulative foreign
    currency translation
    adjustments.............         69         (1,475)         1,475(1)           69                           69
                              -----------   ------------   -----------       --------   -----------       ---------
Total stockholders'
  equity....................     32,108         26,633        (26,633)         32,108       74,051         106,159
                              -----------   ------------   -----------       --------   -----------       ---------
                                $61,652       $ 32,014      $  38,367        $132,033    $   9,051        $141,084
                              ===========   ============   ===========       =========  ===========       =========
</TABLE>
 
       See notes to unaudited pro forma condensed combined balance sheet.
 
                                      F-14
<PAGE>   82
 
                          NOTES TO UNAUDITED PRO FORMA
 
                        CONDENSED COMBINED BALANCE SHEET
 
(1) To record the purchase of the net assets (including the recording of excess
     of purchase price over net assets acquired) and eliminate the stockholders'
     equity of Bio-Research. No estimate of any purchase accounting adjustments
     to record property and equipment at fair value has been made at this time.
     ClinTrials expects to obtain and record a valuation of Bio-Research's
     property and equipment within six months following the Acquisition. It is
     not expected that the reclassification between excess of purchase price
     over net assets acquired and property and equipment will be significant to
     the combined balance sheet. The pro forma adjustments reflect a temporary
     payable to the stockholders of Bio-Research to effect the purchase of
     Bio-Research. The temporary payable would be satisfied from the proceeds of
     the offering referred to in pro forma adjustment (2).
 
(2) To record the net proceeds from the completion of the offering of 2,617,334
     shares of ClinTrials Common Stock at an assumed price of $30.00 per share.
     Gross proceeds of $78.5 million, less estimated issuance costs of $4.4
     million, provides net proceeds of $74.1 million. A portion of the net
     proceeds would be utilized to retire the temporary payable to the
     stockholders of Bio-Research referred to in pro forma adjustment (1).
 
                                      F-15
<PAGE>   83
 
                            CLINTRIALS RESEARCH INC.
 
          UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
                       THREE MONTHS ENDED MARCH 31, 1996
             (DOLLARS IN THOUSANDS, EXCEPT FOR EARNINGS PER SHARE)
 
<TABLE>
<CAPTION>
                                             AS REPORTED    AS REPORTED      PRO FORMA       COMBINED PRO
                                             CLINTRIALS     BIO-RESEARCH    ADJUSTMENTS        FORMA(1)
                                             -----------    ------------    -----------      ------------
<S>                                          <C>            <C>             <C>              <C>
Net service revenue........................    $17,670         $6,324         $    --          $ 23,994
Operating costs:
  Direct costs.............................     10,526          3,658                            14,184
  Selling, general and administrative
     costs.................................      4,750          1,954                             6,704
  Depreciation and amortization............        700            426             240(2)          1,366
                                             -----------    ------------    -----------      ------------
Income from operations.....................      1,694            286            (240)            1,740
Other income (expense):
  Interest income..........................        215             77              --(3)            292
  Interest expense.........................        (14)            (1)                              (15)
                                             -----------    ------------    -----------      ------------
Income before income taxes.................      1,895            362            (240)            2,017
Provision for income taxes.................       (782)           176              --(4)           (606)
                                             -----------    ------------    -----------      ------------
Net income.................................    $ 1,113         $  538         $  (240)         $  1,411
                                             =========      =========       =========        ==========
Weighted average common shares.............      9,185                          2,316(5)         11,501
                                             =========                      =========        ==========
Earnings per common and common equivalent
  share....................................    $  0.12                                         $   0.12
                                             =========                                       ==========
</TABLE>
 
    See notes to unaudited pro forma condensed combined statement of income.
 
                                      F-16
<PAGE>   84
 
                            CLINTRIALS RESEARCH INC.
 
          UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF INCOME
                          YEAR ENDED DECEMBER 31, 1995
             (DOLLARS IN THOUSANDS, EXCEPT FOR EARNINGS PER SHARE)
 
<TABLE>
<CAPTION>
                                                  AS REPORTED   AS REPORTED     PRO FORMA      COMBINED
                                                  CLINTRIALS    BIO-RESEARCH   ADJUSTMENTS   PRO FORMA(1)
                                                  -----------   ------------   -----------   ------------
<S>                                               <C>           <C>            <C>           <C>
Net service revenue.............................    $57,846       $ 26,342       $    --       $ 84,188
Operating costs:
  Direct costs..................................     34,850         14,408                       49,258
  Selling, general and administrative costs.....     15,209          8,024                       23,233
  Depreciation and amortization.................      2,287          1,573           959(2)       4,819
                                                  -----------   ------------   -----------   ------------
Income from operations..........................      5,500          2,337          (959)         6,878
Other income (expense):
  Interest income...............................        744            373            --(3)       1,117
  Interest expense..............................        (79)           (10)                         (89)
                                                  -----------   ------------   -----------   ------------
Income before income taxes......................      6,165          2,700          (959)         7,906
Provision for income taxes......................     (2,564)         1,026            --(4)      (1,538)
                                                  -----------   ------------   -----------   ------------
Net income......................................    $ 3,601       $  3,726       $  (959)      $  6,368
                                                  =========      =========     =========     ==========
Weighted average common shares..................      9,088                        2,316(5)      11,404
                                                  =========                    =========     ==========
Earnings per common and common equivalent
  share.........................................    $  0.40                                    $   0.56
                                                  =========                                  ==========
</TABLE>
 
    See notes to unaudited pro forma condensed combined statement of income.
 
                                      F-17
<PAGE>   85
 
                          NOTES TO UNAUDITED PRO FORMA
 
                    CONDENSED COMBINED STATEMENTS OF INCOME
 
(1) The pro forma condensed combined statements of income do not give effect to
     any overhead reductions or cost savings, if any, which may be realized
     after the consummation of the Acquisition.
 
(2) To adjust amortization expense. The excess of purchase price over net assets
     acquired related to the Acquisition will be amortized over 40 years using
     the straight line method. The amounts for the year ended December 31, 1995
     and the three months ended March 31, 1996 were $959 and $240, respectively.
     No estimate of any purchase accounting adjustments to record property and
     equipment at fair value has been made at this time. ClinTrials expects to
     obtain and record a valuation of Bio-Research's property and equipment
     within six months following the Acquisition. It is not expected that any
     reclassification between excess of purchase price over net assets acquired
     and property and equipment would significantly affect amortization expense.
 
(3) Interest income as a result of the cash proceeds received in excess of the
     cash used to acquire Bio-Research and for costs of the Offering is not
     reflected in the pro forma condensed combined statements of income. The
     Company is presently earning a 4.11% yield on tax exempt investments. The
     following table summarizes the total effect on the pro forma condensed
     combined statements of income as if the interest had been earned on the
     excess cash.
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED           THREE MONTHS
                                                             DECEMBER 31, 1995   ENDED MARCH 31, 1996
                                                             -----------------   --------------------
     <S>                                                     <C>                 <C>
     Excess cash invested..................................       $ 9,051              $  9,051
                                                             =============       ================
     Pro forma income, as stated...........................         6,368                 1,411
     Estimated tax exempt interest income..................           372                    93
                                                             -----------------       ----------
     Pro forma income with excess cash invested............       $ 6,740              $  1,504
                                                             =============       ================
     Pro forma weighted average shares outstanding for
       entire offering.....................................        11,705                11,802
                                                             =============       ================
     Pro forma earnings per share after consideration of
       investment of excess funds..........................       $  0.58              $   0.13
                                                             =============       ================
</TABLE>
 
(4) The pro forma amortization adjustment (Note 2) does not affect the income
     tax provision as such tax benefit of the amortization adjustment would
     merely increase the federal and Quebec research and development tax credits
     to be carried forward to future periods. The pro forma condensed combined
     statements of income do not provide for deferred United States taxes on the
     income earned by Bio-Research in Canada as ClinTrials intends to
     permanently reinvest any earnings outside the United States.
 
(5) The weighted average common shares outstanding in the pro forma columns
     include the 2,316,000 shares of Common Stock offered hereby that will be
     used to fund the $65 million cost of the Acquisition. The calculation of
     these shares is based on an offering price of $30.00 per share, net of
     offering costs.
 
                                      F-18
<PAGE>   86
 
- ------------------------------------------------------
- ------------------------------------------------------
 
NO DEALER, SALESPERSON, OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THE OFFER CONTAINED HEREIN, AND, IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR ANY OF THE UNDERWRITERS. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY THE SHARES OF
THE COMMON STOCK OFFERED HEREBY BY ANYONE IN ANY JURISDICTION IN WHICH SUCH
OFFER OR SOLICITATION IS NOT AUTHORIZED, OR IN WHICH THE PERSON MAKING SUCH
OFFER OR SOLICITATION IS NOT QUALIFIED TO DO SO, OR TO WHOM IT IS UNLAWFUL TO
MAKE SUCH SOLICITATION OR OFFER. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY
SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT
THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR
THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY DATE SUBSEQUENT TO
THE DATE HEREOF.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Available Information.................    2
Prospectus Summary....................    3
Risk Factors..........................    7
Bio-Research Acquisition..............   11
Use of Proceeds.......................   12
Price Range of Common Stock and
  Dividend Policy.....................   12
Capitalization........................   13
Selected Consolidated Financial
  Data................................   14
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................   15
Business..............................   23
Management............................   33
Principal Stockholders................   35
Underwriting..........................   36
Legal Matters.........................   37
Experts...............................   37
Incorporation of Certain Information
  by Reference........................   37
Index to Financial Statements.........  F-1
</TABLE>
 
             ------------------------------------------------------
             ------------------------------------------------------
             ------------------------------------------------------
             ------------------------------------------------------
 
                                2,617,334 SHARES
 
                       (LOGO) CLINTRIALS RESEARCH INC.
 
                                  COMMON STOCK
 
                           -------------------------
                                   PROSPECTUS
                           -------------------------

                             J.C. BRADFORD & CO.
                              PIPER JAFFRAY INC.
                              SMITH BARNEY INC.

                                 July 24, 1996
 
             ------------------------------------------------------
             ------------------------------------------------------


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