VERTEX PHARMACEUTICALS INC / MA
10-Q, 1997-11-12
PHARMACEUTICAL PREPARATIONS
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                      SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                           -------------------------
                                           
                                  FORM 10-Q
                                           
                                           
[x] Quarterly report pursuant to Section 13 or 15(d) of the Securities and
    Exchange Act of 1934
    For the quarterly period ended September 30, 1997
                                      OR
[ ] Transition report pursuant to Section 13 or 15(d) of the Securities and
    Exchange Act of 1934
    For the transition period from          to          
                                   ---------  ----------


                        Commission File Number  0-19319   
                                               ---------
                                           
                      Vertex Pharmaceuticals Incorporated
             (Exact name of registrant as specified in its charter)
                                           
                                       
        Massachusetts                                 04-3039129
        -------------                                 ----------
(State or other jurisdiction of                   (I.R.S. Employer
incorporation or organization)                    Identification No.)


           130 Waverly Street, Cambridge, Massachusetts  02139-4242
           --------------------------------------------------------
         (Address of principal executive offices, including zip code)
                                           
                                        
                                (617) 577-6000
                                --------------
             (Registrant's telephone number, including area code)
                                           
                                       
    Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 
1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports), and (2) has been subject to 
such filing requirements for the past 90 days.

                              YES   X      NO 
                                  -----   -------
                                           

    Indicate the number of shares outstanding of each of the issuer's classes 
of common stock, as of the latest practicable date.

Common Stock, par value $.01 per share                 25,196,342        
- --------------------------------------      -------------------------------
               Class                        Outstanding at November 6, 1997
         

                                       1
 
<PAGE>
 
                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                                        INDEX
                                           


                                                                         Page
                                                                       --------

Part I. -  Financial Information

    Item 1.   Condensed Consolidated Financial Statements
                Report of Independent Accountants                           3

              Condensed Consolidated Balance Sheets -
                    September 30, 1997 and December 31, 1996                4

              Condensed Consolidated Statements of Operations -
                    Three Months Ended September 30, 1997 and 1996          5

              Condensed Consolidated Statements of Operations -
                    Nine Months Ended September 30, 1997 and 1996           6

              Condensed Consolidated Statements of Cash Flows -
                    Nine Months Ended September 30, 1997 and 1996           7

              Notes to Condensed Financial Statements                       8

    Item 2.   Management's Discussion and Analysis of Financial
                    Condition and Results of Operations                    10


Part II. -  Other Information                                              14
 
Signatures                                                                 15

                                       2

<PAGE>

                          Report of Independent Accountants
                          ---------------------------------
                                           
                                           
To the Board of Directors and Stockholders of Vertex Pharmaceuticals
Incorporated:

We have reviewed the accompanying condensed consolidated balance sheet of 
Vertex Pharmaceuticals Incorporated as of September 30, 1997, and the related 
condensed consolidated statements of operations and cash flows for the three 
month and the nine month periods ended September 30, 1997 and 1996. These 
financial statements are the responsibility of the company's management.

We conducted our review in accordance with standards established by the 
American Institute of Certified Public Accountants. A review of interim 
financial information consists principally of applying analytical procedures 
to financial data and making inquiries of persons responsible for financial 
and accounting matters. It is substantially less in scope than an audit 
conducted in accordance with generally accepted auditing standards, the 
objective of which is the expression of an opinion regarding the financial 
statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that 
should be made to the condensed consolidated financial statements referred to 
above for them to be in conformity with generally accepted accounting 
principles.

We have previously audited, in accordance with generally accepted auditing 
standards, the consolidated balance sheet as of December 31, 1996, and the 
related consolidated statements of  operations, retained earnings, and cash 
flows for the year then ended (not presented herein); and in our report dated 
February 18, 1997, we expressed an unqualified opinion on those consolidated 
financial statements. In our opinion, the information set forth in the 
accompanying condensed consolidated balance sheet as of December 31, 1996, is 
fairly stated, in all material respects, in relation to the consolidated 
balance sheet from which it has been derived.


                                       /s/ COOPERS & LYBRAND L.L.P.



 Boston, Massachusetts
 October 21, 1997

                                       3

<PAGE>
 
                      VERTEX PHARMACEUTICALS INCORPORATED
                                           
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                   (Unaudited)
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                     September 30,            December 31,
                                                                         1997                     1996
                                                                     -------------            ------------
<S>                                                                  <C>                      <C>

                                               ASSETS
                                           
Current assets:
   Cash and cash equivalents                                           $ 177,191                $  34,851
   Short-term investments                                                106,092                   95,508
   Prepaid expenses and other current assets                               2,183                    1,791
                                                                     -------------            ------------

       Total current assets                                              285,466                  132,150

Restricted cash                                                            2,316                    2,316
Property and equipment, net                                               10,182                    8,663
Other assets                                                                 763                      370
                                                                     -------------            ------------

       Total assets                                                    $ 298,727                $ 143,499
                                                                     -------------            ------------
                                                                     -------------            ------------


                               LIABILITIES AND STOCKHOLDERS' EQUITY
                                           
Current liabilities:
   Obligations under capital lease and debt                            $   2,677                $   2,910
   Accounts payable and accrued expenses                                   8,525                    4,146
   Deferred revenue                                                          556                      ---
                                                                     -------------            ------------

       Total current liabilities                                          11,758                    7,056
                                                                     -------------            ------------

Obligations under capital leases and debt, excluding
   current portion                                                         5,488                    5,617
                                                                     -------------            ------------

       Total liabilities                                                  17,246                   12,673
                                                                     -------------            ------------

Stockholders' equity:
   Common stock                                                              251                      211
   Additional paid-in capital                                            391,056                  227,510
   Equity adjustments                                                        151                       49
   Accumulated deficit                                                  (109,977)                 (96,944)
                                                                     -------------            ------------

       Total stockholders' equity                                        281,481                  130,826
                                                                     -------------            ------------

       Total liabilities and stockholders' equity                      $ 298,727                $ 143,499
                                                                     -------------            ------------
                                                                     -------------            ------------
</TABLE>

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

                                       4

<PAGE>
 
                     VERTEX PHARMACEUTICALS INCORPORATED

               CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                 (Unaudited)
                    (In thousands, except per share data)
                                       

<TABLE>
<CAPTION>

                                                           Three Months Ended September 30,
                                                           --------------------------------

                                                                 1997             1996
                                                              ----------       ----------
<S>                                                           <C>              <C>

Revenues:
   Collaborative and other research and development            $  9,739         $  2,930
   Interest income                                                3,808            1,190
                                                              ----------       ----------

       Total revenues                                            13,547            4,120
                                                              ----------       ----------


Costs and expenses:
   Research and development                                      16,449            8,525
   General and administrative                                     2,813            1,832
   Interest                                                         141              109
                                                              ----------       ----------

       Total costs and expenses                                  19,403           10,466
                                                              ----------       ----------

Net loss                                                       $ (5,856)        $ (6,346)
                                                              ----------       ----------
                                                              ----------       ----------

Net loss per common share                                      $  (0.23)        $  (0.33)
                                                              ----------       ----------
                                                              ----------       ----------


Weighted average number of common shares
   outstanding                                                   25,119           19,364
                                                              ----------       ----------
                                                              ----------       ----------
</TABLE>



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

                                       5

<PAGE>

                    VERTEX PHARMACEUTICALS INCORPORATED
                                      
              CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                (Unaudited)
                  (In thousands, except per share amounts)
                                           

<TABLE>
<CAPTION>

                                                            Nine Months Ended September 30,
                                                            -------------------------------

                                                                 1997             1996
                                                              ----------       ----------
<S>                                                           <C>              <C>

Revenues:
   Collaborative and other research and development            $ 22,719         $  8,519
   Interest income                                                9,901            3,498
                                                              ----------       ----------

       Total revenues                                            32,620           12,017
                                                              ----------       ----------

Costs and expenses:
   Research and development                                      37,561           27,352
   General and administrative                                     7,654            5,473
   License payment                                                  ---           15,000
   Interest                                                         438              331
                                                              ----------       ----------

       Total costs and expenses                                  45,653           48,156
                                                              ----------       ----------

Net loss                                                       $(13,033)        $(36,139)
                                                              ----------       ----------
                                                              ----------       ----------

Net loss per common share                                      $  (0.54)        $  (2.00)
                                                              ----------       ----------
                                                              ----------       ----------


Weighted average number of common shares
   outstanding                                                   23,950           18,036
                                                              ----------       ----------
                                                              ----------       ----------
</TABLE>


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

                                       6

<PAGE>

                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                   CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                     (Unaudited)
                                    (In thousands)
                                           

<TABLE>
<CAPTION>

                                                            Nine Months Ended September 30,
                                                            -------------------------------

                                                                 1997             1996
                                                              ----------       ----------
<S>                                                           <C>              <C>

Cash flows from operating activities:
   Net loss                                                    $(13,033)        $(36,139)
   Adjustments to reconcile net loss to
      net cash used by operating activities:
      Depreciation and amortization                               2,565            2,534
      Changes in assets and liabilities:
        Prepaid expenses and other
          current assets                                           (392)              18
        Accounts payable and accrued
          expenses                                                4,379           (3,607)
        Deferred revenue                                            556             (197)
                                                              ----------       ----------
          Net cash provided (used) by
            operating activities                                 (5,925)         (37,391)
                                                              ----------       ----------

Cash flows from investing activities:
   Net purchases and sales of short-term investments            (10,468)         (33,767)
   Expenditures for property and equipment                       (4,084)          (1,708)
   Other assets                                                    (393)            (869)
                                                              ----------       ----------
          Net cash provided (used) by
            investing activities                                (14,945)         (36,344)
                                                              ----------       ----------

Cash flows from financing activities:
   Net proceeds from public offerings of common stock           148,810           77,539
   Proceeds from private placement of common stock               10,000            5,000
   Other issuances of common stock                                4,776            2,039
   Proceeds from equipment sale/leaseback and debt                1,855            1,488
   Repayment of capital lease obligations                        (2,217)          (1,598)
                                                              ----------       ----------
          Net cash provided (used) by
            financing activities                                163,224           84,468
                                                              ----------       ----------

Effect of exchange rate changes on cash                             (14)               1
                                                              ----------       ----------

Increase (decrease) in cash and cash equivalents                142,340           10,734

Cash and cash equivalents at beginning of period                 34,851           28,390
                                                              ----------       ----------

Cash and cash equivalents at end of period                     $177,191         $ 39,124
                                                              ----------       ----------
                                                              ----------       ----------
</TABLE>


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

                                       7


<PAGE>
                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                       NOTES TO CONDENSED FINANCIAL STATEMENTS
                                           

1.  Basis of Presentation

    The year end condensed balance sheet data was derived from audited 
financial statements. Certain information and footnote disclosures normally 
included in the Company's annual financial statements prepared in accordance 
with generally accepted accounting principles have been condensed or omitted. 
The interim financial statements, in the opinion of management, reflect all 
adjustments (including normal recurring accruals) necessary for a fair 
statement of the results for the interim periods ended September 30, 1997 and 
1996.

    The results of operations for the interim periods are not necessarily 
indicative of the results of operations to be expected for the fiscal year, 
although the Company expects to incur a substantial loss for the year ended 
December 31, 1997.  These interim financial statements should be read in 
conjunction with the audited financial statements for the year ended December 
31, 1996, which are contained in the Company's 1996 Annual Report to its 
shareholders and in its Form 10-K filed with the Securities and Exchange 
Commission.

2.  Cash and Cash Equivalents

    For purposes of the statement of cash flows, the Company considers all 
highly liquid investments with maturities of three months or less at the date 
of purchase to be cash equivalents.  Changes in cash and cash equivalents may 
be affected by shifts in investment portfolio maturities as well as by actual 
net cash receipts or disbursements.

3.  Net Loss per Common Share

    The net loss per common share is computed based upon the weighted average 
number of common shares outstanding.  Common equivalent shares are not 
included in the per-share calculations where the effect would be 
anti-dilutive.

4.  Recently Issued Accounting Standards

    The Financial Accounting Standards Board ("FASB") has issued Statement of 
Financial Accounting Standards No. 128 ("SFAS 128"), "Earnings Per Share"  
which modifies the way in which earnings per share ("EPS") is calculated and 
disclosed.  SFAS 128 requires a dual presentation of basic and diluted EPS 
for all years presented in the income statements.  SFAS 128 is effective for 
financial statements for periods ending after December 15, 1997.  The 
adoption of SFAS 128 is not expected to have a material impact on the 
Company's EPS calculation.

    The FASB has recently issued Statement of Financial Accounting  Standards 
No. 130 ("SFAS 130"), "Reporting Comprehensive Income".  This Statement 
requires that total comprehensive income be reported and that changes be 
shown in a financial statement displayed with the same prominence as other 
financial statements. SFAS 130 is effective for fiscal years beginning after 
December 15, 1997. Reclassification of financial statements for earlier 
periods is required for comparative purposes.  The Company does not  believe 
that this will have a material impact on results of operations.

                                       8


<PAGE>
 
                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                       NOTES TO CONDENSED FINANCIAL STATEMENTS
                                           
                                           
5.  Recent Collaborative Agreements

    In September 1997, the Company and Kissei Pharmaceutical Co. Ltd. 
("Kissei") entered into a collaborative agreement to design inhibitors of p38 
MAP Kinase and to develop them as novel, orally active drugs for the 
treatment of inflammatory and neurological diseases.  Under the terms of the 
agreement, Kissei will pay the Company up to $22 million composed of a $4 
million research funding payment paid in September 1997, $11 million of 
product research funding over three years and $7 million of development and 
commercialization milestone payments.  The Company and Kissei will 
collaborate to identify and evaluate compounds that target p38 MAP Kinase.  
Kissei will have the right to develop and commercialize these compounds in 
its licensed territories.  Kissei has exclusive rights to p38 MAP Kinase 
compounds in Japan and certain Southeast Asian countries and semi-exclusive 
rights in China, Taiwan and South Korea.  The Company retains exclusive 
marketing rights in the United States, Canada, Europe, and the rest of the 
world.  In addition, the Company will have the right to supply bulk drug 
material to Kissei for sale in its territory, and will receive royalties and 
drug supply payments on any product sales.  Kissei has the right to terminate 
the agreement without cause upon six months' notice after June 1998.

    In June 1997, the Company and Eli Lilly and Company ("Lilly") entered 
into a collaborative agreement  to design inhibitors of the hepatitis C 
protease enzyme, and to develop them as novel drugs to treat hepatitis C 
infection. Under the terms of the agreement, Lilly will pay the Company up to 
$51 million composed of a $3 million research funding payment paid in June 
1997, $33 million of product research funding over six years and $15 million 
of development and commercialization milestone payments.  The Company and 
Lilly will jointly manage the research, development, manufacturing and 
marketing of drug candidates emerging from the collaboration.  The Company 
will have primary responsibility for drug design, process development and 
pre-commercial drug substance manufacturing, and Lilly will have primary 
responsibility for formulation, preclinical and clinical development and 
global marketing.  The Company has the option to supply 100 percent of 
Lilly's commercial drug substance supply needs. The Company will receive 
royalties on future product sales, if any.  If the Company exercises its 
commercial supply option, the Company will receive drug supply payments in 
addition to royalties on future product sales, if any.  Lilly has the right 
to terminate the agreement without cause upon six months' notice after June 
1999.  In connection with this collaboration, Lilly purchased 263,922 shares 
of the Company's common stock for $10,000,000.

                                           
                                       9

<PAGE>

                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                         CONDITION AND RESULTS OF OPERATIONS
                                           
    The Company is engaged in the discovery, development and 
commercialization of novel, small molecule pharmaceuticals for the treatment 
of major diseases for which there are currently limited or no effective 
treatments.  The Company is a leader in the use of structure-based drug 
design, an approach to drug discovery that integrates advanced biology, 
biophysics and chemistry.  The Company is conducting nine significant 
pharmaceutical research and development programs to develop pharmaceuticals 
for the treatment of viral diseases, multidrug resistance in cancer, 
autoimmune diseases, inflammatory diseases and neurodegenerative disorders.  
Four of these programs are in the development phase, and the other four are 
in the research phase.  During the third quarter of 1997, the Company's 
partner, Glaxo Wellcome plc ("Glaxo Wellcome"), advanced Phase III clinical 
development of VX-478 (141W94), the lead compound in the Company's HIV 
program, in the United States, Canada and Europe.  Kissei is also developing 
VX-478 as the Company's partner for the HIV program in the Far East. Through 
a series of Phase II clinical trials underway, the Company and its partner 
for development and marketing of VX-710 in Canada, BioChem Therapeutics Inc. 
("BioChem"), are evaluating VX-710 for the reversal of cancer multidrug 
resistance in solid tumors.  During the quarter, the Company and Alpha 
Therapeutic ("Alpha") terminated their agreement to develop VX-366, an oral 
compound for the treatment of inherited hemoglobin disorders, including 
sickle cell anemia and beta thalassemia.  In addition, the Company signed a 
research, development and commercialization agreement with Kissei to develop 
new drugs targeting p38 MAP Kinase to treat inflammatory and neurological 
diseases.

    To date, the Company has not received any revenues from the sale of 
pharmaceutical products and does not expect to receive such revenues this 
fiscal year, if ever.  The Company has incurred since its inception, and may 
incur over the next several years, significant operating losses as a result 
of expenditures for its research and development programs.  The Company 
expects that losses will fluctuate from quarter to quarter and that such 
fluctuations may be substantial.

Results of Operations

    Three Months Ended September 30, 1997 Compared with Three Months Ended 
September 30, 1996.  For the third quarter of 1997, the Company's total 
revenues were $13,547,000 as compared to $4,120,000 during the same period in 
1996.  From quarter to quarter, the Company's revenues fluctuate as a result 
of changes in the timing and amount of partner research support payments, 
partner reimbursements of Vertex drug development costs, and payments for the 
achievement of various research and development milestones.  In the third 
quarter of 1997, the Company received $9,380,000 in revenue from its 
collaborative agreements, $3,808,000 in interest received on invested funds 
and $359,000 from government grants and  other revenue.  In the third quarter 
of 1996, the Company received $2,678,000 in revenue from its collaborative 
agreements, $1,190,000 in interest earned on invested funds and $252,000 from 
government grants and other revenue.  The increase in collaborative revenue 
for the third quarter in 1997 is attributable principally to the $4,000,000 
up-front payment and $750,000 in research funding received from Kissei under 
the collaborative agreement  for the Company's p38 MAP Kinase program, signed 
in September 1997, the reimbursement by Hoechst Marion Roussel ("HMR") of 
certain costs associated with the Company's ICE program, and research funding 
from Lilly under a research collaboration signed in June 1997.

                                      10


<PAGE>

                        VERTEX PHARMACEUTICALS INCORPORATED
                                           
                  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                         CONDITION AND RESULTS OF OPERATIONS
                                           
                                           
    The Company's total costs and expenses increased to $19,403,000 in the 
third quarter of 1997, from $10,466,000 during the same period in 1996. 
Research and development expenses were $16,449,000 in the third quarter of 
1997 as compared to $8,525,000 during the same period in 1996.  This increase 
in expense was principally a result of the continued growth of the Company's 
research and development organization, ongoing clinical trials in the 
multidrug resistance program, and preclinical development expenses for the 
VX-740, the Company's lead compound in the ICE program, and VX-497, the lead 
compound in the IMPDH program.  In addition, during the third quarter of 
1997, the Company purchased a portfolio of ten patent application families 
claiming interleukin 1 beta converting enzyme ("ICE") and its inhibitors from 
Sanofi S.A.  General and administrative expenses increased during the third 
quarter of 1997 to $2,813,000 from $1,832,000 in the third quarter of 1996 
due primarily to increases in administrative personnel, increased legal costs 
associated with patents and other matters, as well as an increase in 
marketing efforts by the Company and the Company's subsidiary Altus Biologics 
Inc. ("Altus").  Interest expense increased to $141,000 in the third quarter 
of 1997 as compared to $109,000 during the same period in 1996 due to higher 
levels of equipment financing.

    The Company incurred a net loss of $5,856,000 or $0.23 per share in the 
third quarter of 1997 as compared to a net loss of $6,346,000 or $0.33 per 
share in the third quarter of 1996.

    Nine Months Ended September 30, 1997 Compared with Nine Months Ended 
September 30, 1996.  The Company's total revenues increased to $32,620,000 
for the nine months ended September 30, 1997 from $12,017,000 for the nine 
months ended September 30, 1996.   In 1997, the Company's revenues consisted 
of $21,439,000 earned under the Company's collaborative agreements, 
$9,901,000 in interest income and $1,280,000 in government grants and other 
income.  In 1996, the Company's revenues consisted of $7,825,000 earned under 
the Company's collaborative agreements, $3,498,000 in interest income and 
$694,000 in government grants and other income.  The increase in revenue 
during 1997 compared to the same period in 1996 was principally due to the 
new collaborative agreements signed in 1997, an increase in development 
reimbursements, and higher investment income.  The Company received 
$4,000,000 from Kissei upon the commencement of the p38 MAP Kinase 
collaboration in September 1997, an upfront payment of $3,000,000 from Lilly 
upon the commencement of the hepatitis C collaboration in June 1997, and 
reimbursements of certain development costs by Kissei and HMR associated with 
the Company's HIV and ICE programs including $4,000,000 from Kissei in the 
first three quarters of 1997. The increase in investment income was due to 
higher levels of cash and investments resulting from public offerings of the 
Company's stock in March 1997 and August 1996.
 
    The Company's total costs decreased to $45,653,000 for the nine months 
ended September 30, 1997 from $48,156,000 for the nine months ended September 
30, 1996. In the second quarter of 1996, the Company paid $15,000,000 to 
obtain a non-exclusive, worldwide license under certain G.D. Searle and 
Company patent applications claiming HIV protease inhibitors.  Research and 
development expenses increased to $37,561,000 in the first nine months of 
1997 from $27,352,000 in the first nine months of 1996, due to additional 
scientific staffing, ongoing Phase II clinical trials for the Company's 
multidrug resistance program, purchase of a patent applications portfolio, as 
well as the commencement of preclinical activities for VX-740, the Company's 
lead compound in the ICE program, and VX-497, the lead compound in the IMPDH 
program.

                                      11

<PAGE>

                          VERTEX PHARMACEUTICALS INCORPORATED
                                           
                  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                         CONDITION AND RESULTS OF OPERATIONS
                                           
                                           
    General and administrative expenses increased during the first nine 
months of 1997 to $7,654,000 from $5,473,000 in the first nine months of 1996 
due primarily to increases in administrative personnel, increased legal costs 
associated with patents and other matters, as well as an increase in 
marketing efforts of the Company and Altus.  Interest expense was $438,000 in 
the first nine months of 1997, an increase from $331,000 in the first nine 
months of 1996, as a result of higher levels of equipment financing during 
the period.

    For the reasons stated above, the Company incurred a net loss of 
$13,033,000 or $0.54 per share in the nine months ended September 30, 1997 
compared to a net loss of $36,139,000 or $2.00 per share in the nine months 
ended September 30, 1996.
                                           
Liquidity and Capital Resources

    The Company's operations have been funded principally through strategic 
collaborative agreements, public offerings and private placements of the 
Company's equity securities, equipment lease financing, government grants and 
interest income.  The Company expects to incur increased research and 
development and related supporting expenses and, consequently, may incur 
continued losses on a quarterly and annual basis as it continues to develop 
existing and future compounds and to conduct clinical trials of potential 
drugs. The Company also expects to incur substantial administrative and 
commercialization expenditures in the future and additional expenses related 
to the filing, prosecution, defense and enforcement of patent and other 
intellectual property rights.
                                           
    The Company expects to finance these substantial cash needs with its 
existing cash and investments at September 30, 1997 of approximately $283 
million, together with interest earned thereon, future payments under its 
existing collaborative agreements, and facilities and equipment financing.  
To the extent that funds from these sources are not sufficient to fund the 
Company's activities, it will be necessary to raise additional funds through 
public offerings or private placements of securities or other methods of 
financing.  There can be no assurance that such financing will be available 
on acceptable terms, if at all.

    In September 1997, the Company entered into a collaborative agreement for 
up to $22 million with Kissei for the research, development and 
commercialization of compounds in connection with the Company's p38 MAP 
Kinase program.  The Company will supply bulk drug material to Kissei for 
sale in its territory, and will receive royalties and drug supply payments on 
product sales, if any.

    In August 1997, the Company and Alpha terminated their agreement to 
develop VX-366, an oral compound for the treatment of inherited hemoglobin  
disorders, including sickle cell anemia and beta thalassemia. This 
termination does not have a material effect on the liquidity and capital 
resources of the Company.

    In June 1997, the Company and Lilly entered into a collaborative 
agreement to design inhibitors of the hepatitis C protease enzyme, and to 
develop them as novel drugs to treat hepatitis C infection.The Company has 
the option to supply 100 percent of Lilly's commercial drug substance supply 
needs.  The Company will receive royalties on future product sales, if any.  
If the Company exercises its commercial supply option, the Company will 
receive drug supply payments in addition to royalties on future product 
sales, if any. In connection with this collaboration, Lilly purchased 263,922 
shares of the Company's common stock for $10,000,000.                         

                                      12

<PAGE>

                         VERTEX PHARMACEUTICALS INCORPORATED
                                           
                  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                         CONDITION AND RESULTS OF OPERATIONS
                                           

    The Company's aggregate cash and investments increased by $152,924,000 
during the nine months ended September 30, 1997 to $283,283,000, principally 
due to a public offering of common stock completed in March 1997, with net 
proceeds of approximately $148,810,000, and an equity investment by Lilly in 
June 1997 of $10,000,000.  Cash used by operations, principally to fund 
research and development activities, was $5,925,000 during the same period.  
The Company also expended $4,084,000 during this period to acquire property 
and equipment, principally for research equipment and facilities.  During the 
first nine months of 1997, the Company entered into equipment lease financing 
in the aggregate amount of $1,855,000 and repaid $2,217,000 of its lease 
obligations.

    The Financial Accounting Standards Board ("FASB") has issued Statement of 
Financial Accounting Standards No. 128 ("SFAS 128"), "Earnings Per Share"  
which modifies the way in which earnings per share ("EPS") is calculated and 
disclosed.  SFAS 128 requires a dual presentation of basic and diluted EPS 
for all years presented in the income statements.  SFAS 128 is effective for 
financial statements for periods ending after December 15, 1997.  The 
adoption of SFAS 128 is not expected to have a material impact on the 
Company's EPS calculation.  The FASB has also issued Statement of Financial 
Accounting Standards No. 130 ("SFAS 130"), "Reporting Comprehensive Income".  
This Statement requires that total comprehensive income be reported and that 
changes be shown in a financial statement displayed with the same prominence 
as other financial statements. SFAS 130 is effective for fiscal years 
beginning after December 15, 1997. Reclassification of financial statements 
for earlier periods is required for comparative purposes.  The Company does 
not  believe that this will have a material impact on results of operations.  

                                      13

<PAGE>


                                      PART II.
                                           
                                  OTHER INFORMATION
                                           
                                           

Item 1.  Legal Proceedings:
         ------------------

         None

Item 2.  Changes in Securities:
         ----------------------

         None

Item 3.  Defaults Upon Senior Securities:
         --------------------------------

         None

Item 4.  Submission of Matters to a Vote of Security Holders:
         ----------------------------------------------------
         
         None
         
Item 5.  Other Information:
         ------------------

         None

Item 6.  Exhibits:
         ---------

         10.1 Research and Development Agreement between the Company and Kissei
              Pharmaceutical Co. Ltd  and the Company effective September 10,
              1997 (filed herewith with certain confidential information
              deleted).
         
         27   Financial Data Schedule. (Exhibit 27 is submitted as an exhibit
              only in the electronic format of this Quarterly Report on Form
              10-Q submitted to the Securities and Exchange Commission.).
         
         99   Letter of Independent Accountants.
         
    
         Reports on Form 8-K:
         --------------------

         None


                                      14

<PAGE>
 
                                      SIGNATURES
                                           
                                           

    Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.


                                  VERTEX PHARMACEUTICALS INCORPORATED




Date:  November 12, 1997               /s/ Thomas G. Auchincloss, Jr.     
                                       ---------------------------------------
                                       Thomas G. Auchincloss, Jr.
                                       Vice President of Finance and Treasurer
                                       (Principal Financial Officer)



Date:  November 12, 1997               /s/ Hans D. van Houte    
                                       ---------------------------------------
                                       Hans D. van Houte
                                       Controller
                                       (Principal Accounting Officer)
 

                                      15


<PAGE>






                                     EXHIBIT 10.1

The Company has omitted from this Exhibit 10.1 portions of the Agreement for 
which the Company has requested confidential treatment from the Securities 
and Exchange Commission.  The portions of the Agreement for which 
confidential treatment has been requested have been deleted and marked with 
an asterisk surrounded by brackets ([*]) and have been filed separately with 
the Securities and Exchange Commission.
 
<PAGE>


                      Research and Development Agreement




                                   between

                      Vertex Pharmaceuticals Incorporated

                                     and

                        Kissei Pharmaceutical Co., Ltd.









Cambridge, Massachusetts, U.S.A.            Matsumoto-City, Nagano Pref., Japan

<PAGE>

                   RESEARCH AND DEVELOPMENT AGREEMENT
                          TABLE OF CONTENTS
- -------------------------------------------------------------------------------

                                                                          Page

INTRODUCTION  ............................................................  1

ARTICLE I -- Definitions  ................................................  2

1.1    "Affiliate"  ......................................................  2
1.2    "Field"  ..........................................................  2
1.3    "Compounds"  ......................................................  2
1.4    "Core Development Activities"  ....................................  2
1.5    "Core Development Costs"  .........................................  2
1.6    "Promising Compound"  .............................................  2
1.7    "Promising Processes"  ............................................  2
1.8    "Patents"  ........................................................  2
1.9    "Promising Patents"  ..............................................  3
1.10   "Research Program"  ...............................................  3
1.11   "Development Program"  ............................................  3
1.12   "KISSEI Technical Information" ....................................  3
1.13   "VERTEX Territory"  ...............................................  3
1.14   "Exclusive Territory"  ............................................  3
1.15   "Semi-Exclusive Territory"  .......................................  3
1.16   "Territory"  ......................................................  3
1.17   "Effective Date" ..................................................  3

ARTICLE II -- Research and Development  ..................................  4

2.1    Commencement  .....................................................  4
2.2    Payments by KISSEI  ...............................................  4
2.3    Research Committee  ...............................................  5
2.4    Exchange of Information  ..........................................  5
2.5    Redirection of Research Program  ..................................  6
2.6    Grantback  ........................................................  6
2.7    Information Transfer  .............................................  6
2.8    Development  ......................................................  7
2.9    Bulk Supply for Research and Development  .........................  7
2.10   KISSEI Research  ..................................................  8

ARTICLE III -- KISSEI's Rights  ..........................................  8

3.1    Selection of Promising Compounds  .................................  8
3.2    Option and Rights Agreement  ......................................  8
3.3    Scientific Strategies  ............................................  9

ARTICLE IV -- Confidentiality  ...........................................  9

4.1    Undertaking  ......................................................  9
4.2    Exceptions  .......................................................  9
4.3    Publicity  ........................................................ 10
4.4    Survival  ......................................................... 10

<PAGE>

                              TABLE OF CONTENTS
                                 (continued)
- -------------------------------------------------------------------------------

                                                                          Page

ARTICLE V -- Patents ..................................................... 10

5.1    Preparation ....................................................... 10
5.2    Cost Reimbursement ................................................ 10
5.3    Failure to Reimburse .............................................. 11

ARTICLE VI -- Infringement ............................................... 11

ARTICLE VII -- Term and Termination ...................................... 11

7.1    Term of Agreement ................................................. 11
7.2    Termination of Research Program by KISSEI for Cause ............... 11
7.3    Termination of Research Program by KISSEI Without Cause ........... 12
7.4    Termination by VERTEX ............................................. 13
7.5    Effect of Termination ............................................. 13

ARTICLE VIII -- Dispute Resolution ....................................... 13

8.1    Governing Law, and Jurisdiction ................................... 13
8.2    Arbitration ....................................................... 13

ARTICLE IX -- Miscellaneous Provisions ................................... 14

9.1    Official Language ................................................. 14
9.2    Waiver ............................................................ 14
9.3    Force Majeure ..................................................... 14
9.4    Severability ...................................................... 15
9.5    Government Acts ................................................... 15
9.6    Government Approvals .............................................. 15
9.7    Export Controls ................................................... 15
9.8    Assignment ........................................................ 15
9.9    Counterparts ...................................................... 15
9.10   No Agency ......................................................... 15
9.11   Notice ............................................................ 16
9.12   Headings .......................................................... 16
9.13   Authority ......................................................... 16
9.14   Entire Agreement .................................................. 16
9.15   Competition ....................................................... 16

Schedule I -- List of Vertex Patent Applications and Patents

Schedule II -- Summary of Research Activities

Schedule III --Countries in the Exclusive Territory


<PAGE>

                          Research and Development Agreement
                                           

AGREEMENT made and effective this 10th day of September, 1997, between VERTEX 
PHARMACEUTICALS INCORPORATED, a Massachusetts corporation ("VERTEX"), and 
KISSEI PHARMACEUTICAL CO., LTD., a Japanese corporation ("KISSEI").

                                     Introduction

A.  VERTEX is a multidisciplinary biopharmaceutical company focused on the use
    of structural biology, biophysics and organic chemistry to design and
    develop novel human therapeutics.  The Company has been involved for some
    time in research aimed at developing drugs to treat acute and chronic
    inflammation and neurodegeneration.

B.  KISSEI is a diversified pharmaceutical company with substantial expertise
    in the area of research, product development, the conduct of preclinical
    and clinical trials, sales and marketing, and is interested in the
    research, development, marketing and sale of pharmaceuticals for the
    treatment of acute and chronic inflammation and neurodegeneration.

C.  Both parties desire to enter into a collaboration specifically targeting an
    area in which VERTEX has been working for some time -- the development of
    small molecule inhibitors of the p38 enzyme, a member of the MAP kinase
    family -- applying the complementary skills and strengths which each party
    brings to the transaction.

D.  The purpose of this Agreement is to set forth the terms upon which VERTEX,
    together with KISSEI, will attempt to design and develop novel small
    molecule inhibitors of the p38 enzyme for the treatment of acute and
    chronic inflammation and neurodegeneration, with the financial and
    technical assistance of KISSEI, for development, manufacture, marketing and
    sale by KISSEI and/or sublicensees in the Territory (as defined below) upon
    the terms set forth herein and in the attached form of Option and Rights
    Agreement.

E.  KISSEI desires to learn various scientific strategies from VERTEX that can
    be applied to drug discovery programs outside of the Research Program, and
    VERTEX is willing to accommodate that desire.

In consideration of the mutual covenants set forth in this Agreement, and other
good and valuable consideration, the parties agree as follows:
 
                   Research and Development Agreement -- Page 1

<PAGE>

                                      Article I
                                           
                                     Definitions
                                           
    1.1  "Affiliate" shall mean at any time, any person or legal entity, then 
directly or indirectly controlled by, controlling or under common control 
with the party with respect to which this term is associated, and shall 
include any person or legal entity which owns, either of record or 
beneficially, 50% or more of the voting stock of any party hereto, or 50% or 
more of the voting stock of which is owned by any party hereto.

    1.2  "Field" shall mean human use in the diagnosis, prevention and 
treatment of acute and chronic inflammation and neurodegeneration.

    1.3  "Compounds" shall mean small molecule inhibitors of the p38 enzyme 
discovered or developed by VERTEX, or by VERTEX together with KISSEI, in the 
Field in the course of the Research Program, whether discovered or developed 
by VERTEX or by VERTEX together with KISSEI (i) prior to or after the 
effective date of this Agreement, or (ii) unless the Research Program is 
terminated earlier by KISSEI pursuant to Section 7.2 or 7.3 hereof, during 
[*] Research Program pursuant to Section 2.1 of this Agreement.

    1.4  "Core Development Activities" shall have the meaning ascribed to it 
in Section 2.8(c) hereof.

    1.5. "Core Development Costs" shall have the meaning ascribed to it in 
Section 2.8(c) hereof.

    1.6  "Promising Compound" shall mean any Compound which is the subject of 
or which is discovered during the Research Program and which becomes the 
subject of KISSEI's rights in accordance with the provisions of Article III 
hereof.

    1.7  "Promising Processes" shall mean any technical information resulting 
from the Research Program discovered or developed by VERTEX or by VERTEX 
together with KISSEI in the Field in the course of the Research Program, 
whether discovered or developed by VERTEX or by VERTEX together with KISSEI 
prior to or after the effective date of this Agreement.

    1.8  "Patents" shall mean any existing or later-filed patents or patent 
applications filed by VERTEX or under which VERTEX acquires or has acquired 
rights (including rights acquired under Section 2.6 hereof) claiming a 
Compound, a Promising Process, or a method of manufacturing or using a 
Compound, including any continuation, continuation-in-part, or division 
thereof or any substitute application therefor.  An up-to-date list of 
Patents is appended hereto as Schedule I.  VERTEX shall keep KISSEI currently 
informed in writing of additions and amendments thereto.

                   Research and Development Agreement -- Page 2

<PAGE> 

    1.9  "Promising Patents" shall mean any Patents which become the subject 
of KISSEI's rights in accordance with the provisions of Article III hereof.

    1.10 "Research Program" shall mean research activities associated with 
discovery or creation of Compounds, including in vitro studies of Compounds, 
in vivo animal studies for research purposes only (rather than for the 
generation of data for regulatory submission), and related activities, as 
described in the Summary of Research Activities attached hereto as Schedule 
II.

    1.11 "Development Program" shall mean activities associated with 
development of Promising Compounds for sale, including but not limited to (a) 
selection of clinical candidates from among lead Compounds and preparation 
for preclinical assessment thereof; (b) formulation of Promising Compounds 
for use in preparation for preclinical studies; (c) preclinical animal 
studies performed in accordance with "Good Laboratory Practices" (or the 
applicable equivalent); (d) manufacture of Promising Compounds for 
preclinical and clinical studies; (e) planning, implementation, evaluation 
and administration of human clinical trials; (f) manufacturing process 
development and scale-up; and (g) preparation and submission of applications 
for regulatory approval.

    1.12 "KISSEI Technical Information" shall mean all know-how, proprietary 
information, or special knowledge of KISSEI relating to the research, 
development, utilization, manufacture, or use of any Compound or Promising 
Process, including but not limited to processes, techniques, methods, 
products, materials, and compositions.

    1.13 "VERTEX Technical Information" shall mean all know-how, proprietary 
information, or special knowledge of VERTEX relating to the research, 
development, utilization, manufacture, or use of any Compound or Promising 
Process, including but not limited to processes, techniques, methods, 
products, materials, and compositions.

    1.14 "Exclusive Territory" shall mean those countries identified on 
Schedule III hereto as comprising the exclusive territory.

    1.15 "Semi-Exclusive Territory" shall mean those countries identified on 
Schedule III hereto as comprising the semi-exclusive territory.

    1.16 "Territory" shall mean the Exclusive Territory and the 
Semi-Exclusive Territory.

    1.17 "Effective Date" shall mean the effective date of this Agreement as 
set forth on the first page hereof.

                   Research and Development Agreement -- Page 3

<PAGE>
 
                                      ARTICLE II
                                           
                               Research and Development
                                           
    2.1  Commencement.  VERTEX or VERTEX together with KISSEI shall commence 
the Research Program promptly upon the Effective Date and shall use its 
reasonable best efforts to diligently conduct the Research Program during the 
term of this Agreement in accordance with the provisions hereof.  The 
Research Program shall be concluded not later than 30 June 2000, unless 
extended by agreement of the parties hereto.  At the election of KISSEI, 
subject to mutual agreement including agreement upon any additional funding 
to be provided to VERTEX by KISSEI, the Research Program may be extended 
through 31 December 2001.

    2.2  Payments by KISSEI.  KISSEI will provide financial support to the 
Research Program and Development Program in the form of the following 
payments to VERTEX.
         

         1.   As soon as practicable but in any event not more than fourteen
              (14) days after execution of this Agreement :   $4,000,000.00

         2.   July 1, 1997 - June 30, 1998:                   [ * ]

         3.   July 1, 1998 - June 30, 1999:                   [ * ]

         4.   July 1, 1999 - June 30, 2000:                   [ * ]

KISSEI will make additional research support payments to VERTEX in the 
amounts stated below upon the occurrence of any of the following events with 
respect to each Promising Compound.

         5.   [ * ]
                                                              [ * ]

         6.   [ * ]  
                                                              [ * ]

         7.   [ * ]
                                                              [ * ]


         The payments referenced in each of items 2, 3 and 4 above shall be 
made in equal quarterly installments on the first day of each three month 
period during the year referenced in each item, i.e., each July 1, October 1, 
January 1 and April 1.  The payment due on July 1, 1997 shall be made within 
fourteen (14) days after the execution of this Agreement.  All payments 

                   Research and Development Agreement -- Page 4

<PAGE>
 
shall be made by wire transfer in United States dollars to the credit of such 
bank account as may be designated by VERTEX in writing to KISSEI.  Any 
payment which falls due on a date which is a legal holiday in the 
Commonwealth of Massachusetts may be made on the next succeeding day which is 
not a legal holiday in the Commonwealth.  If any installment payments set 
forth above are not then due and remain unpaid upon termination of this 
Agreement pursuant to Section 7.1 here of, KISSEI's obligation to make such 
payments herein as scheduled in Section 2.2 shall survive termination of this 
Agreement, if upon such termination, the Option and Rights Agreement shall be 
in effect with respect to a Promising Compound.

         KISSEI shall be required to make the payments referenced in items 5, 
6 and 7 above with respect to each Promising Compound developed hereunder and 
under the Option and Rights Agreement, provided that in the event that a 
Promising Compound fails in development, any of items 5, 6 and 7 previously 
paid with respect to such Promising Compound shall be made fully creditable 
toward the same item due with respect to a subsequent Promising Compound, and 
provided further that if two (or more) Promising Compounds are being 
developed at the same time, items 5, 6 and 7 will be applicable to each such 
Promising Compound. On the date any one of the payments under items 5, 6 and 
7 above is earned with respect to a particular Promising Compound, any of the 
other lower numbered items 5, 6 and 7 which have not yet been earned with 
respect to that Promising Compound shall be deemed to have been achieved and 
therefore payable with respect to that Promising Compound.

    2.3  Research Committee.  Upon the execution of this Agreement, VERTEX 
and KISSEI will establish a Research Committee which shall consist of not 
more than five persons designated from time to time by each of VERTEX and 
KISSEI.  The Research Committee shall meet formally at least semi-annually, 
or with such other frequency, and at such time and location, as may be 
established by the Committee, for the following purposes:

         (a)  To receive and review reports by VERTEX and KISSEI, which shall 
be prepared by each party and submitted to the Research Committee and to the 
other party on a quarterly basis within fifteen (15) days after the end of 
the quarter, setting forth in general terms the results of work performed by 
the reporting party and its Affiliates and sublicensees during the preceding 
calendar quarter under the Research Program, including any planned or filed 
patent applications covering Compounds;

         (b)  To advise VERTEX and KISSEI concerning research strategy, goals 
and activities, and to consider whether redirection of the Research Program 
should be recommended to VERTEX and KISSEI under Section 2.5 of this 
Agreement;

         (c)  To assist in coordinating scientific interactions between 
VERTEX and KISSEI during the course of the Research Program;

         (d)  To discuss matters relating to patents.

    2.4  Exchange of Information.  VERTEX and KISSEI will meet informally on 
a regular basis to discuss the Research Program, and will freely share 
technical information in the  

                   Research and Development Agreement -- Page 5
<PAGE>

Field, including VERTEX Technical Information and KISSEI Technical 
Information, which is not subject to restrictions imposed by a third party on 
disclosure to or use by the other party.  As of the effective date of this 
Agreement, neither VERTEX nor KISSEI is subject to any such restrictions.  
VERTEX and KISSEI will each provide quarterly written reports to the other on 
the progress of the Research Program within fifteen (15) days after the end 
of each calendar quarter during the term of the Research Program.  Each party 
will enable any of the other party's representatives on the Research 
Committee (or other authorized representatives), to review the ongoing 
research being conducted by it under the Research Program and to discuss that 
research with its officers, all at such reasonable times and as often as may 
be reasonably requested.  Any representatives of VERTEX or KISSEI receiving 
information from representatives of the other party shall sign appropriate 
agreements ensuring that information disclosed to them is held in confidence. 
 KISSEI shall be free to apply any scientific strategies learned from VERTEX 
by it during the course of the Research Program, and not the subject of 
patent claims, to its own drug discovery efforts outside the Research Program 
without any further obligation to VERTEX.

    2.5  Redirection of Research Program.  If at any time during the term of 
this Agreement, the Research Committee shall determine in good faith that the 
Research Program or any portion thereof cannot be successfully completed, or 
if so completed will not produce Compounds that are commercially viable, the 
Committee may suggest revision or reorientation of the Research Program to 
each party's own top management, and upon mutual consent VERTEX and KISSEI 
shall thereafter promptly modify their respective activities in connection 
with the Research Program accordingly.

    2.6  Grantback.  KISSEI shall keep VERTEX fully advised of any Compounds 
designed or discovered by KISSEI or any of its Affiliates, sublicensees and 
subcontractors  as a result of work under the Research Program ("KISSEI 
Research Compound"), and any improvements made by KISSEI or its Affiliates or 
sublicensees relating to Compounds and Promising Processes during the term of 
the Research Program and the Development Program, whether patentable or not 
("KISSEI Improvements").  KISSEI shall assign to VERTEX all of its rights to 
any such KISSEI Research Compounds and KISSEI Improvements, and any such 
KISSEI Research Compounds and KISSEI Improvements shall be considered 
Compounds and/or VERTEX Technical Information and subject to KISSEI's rights 
hereunder.  KISSEI will seek to obtain similar rights in favor of VERTEX for 
any KISSEI Improvements generated or made available to it by its Affiliates 
and sublicensees, if any.  VERTEX shall seek to obtain rights hereunder for 
KISSEI in the Territory for any such improvements generated or made available 
to VERTEX by its other licensees, if any.

    2.7  Information Transfer.  At such time as VERTEX and KISSEI, pursuant 
to Article III hereof, shall enter into the Option and Rights Agreement with 
respect to Promising Compounds, VERTEX shall deliver to KISSEI all 
information which is necessary or useful for further development, manufacture 
and commercial exploitation and distribution of the Promising Compounds in 
the Territory.  This information shall include copies of all patents, patent 
applications, copyrights, copyright registrations and applications therefor 
and all other manifestations of the intellectual property embodied in the 
Promising Compounds, whether in human or machine readable form.

                   Research and Development Agreement -- Page 6

<PAGE>

    2.8  Development.  (a) KISSEI will have the exclusive right and 
obligation to develop and sell Promising Compounds in the Exclusive 
Territory, including without limitation the obligation to initiate and 
complete any preclinical and clinical studies required to obtain regulatory 
approval of Promising Compounds in the Exclusive Territory, and shall bear 
all costs of the Development Program for Promising Compounds in the Exclusive 
Territory.

    (b) KISSEI will have exclusive rights to develop, manufacture and sell 
Promising Compounds in the Semi-Exclusive Territory, but subject to the right 
of VERTEX, or not more than one licensee of VERTEX in any country in the 
Semi-Exclusive Territory, also to develop, manufacture or sell Promising 
Compounds in the Semi-Exclusive Territory.  The parties will attempt to 
coordinate their respective development activities in the Semi-Exclusive 
Territory but shall have the right to pursue development of Promising 
Compounds independently if effective coordination is not possible.  Absent 
any agreement to the contrary, each party will bear the cost of its own 
development activities in the Semi-Exclusive Territory, except as set forth 
below with respect to Core Development Activities, and will have the right to 
market and sell in the Semi-Exclusive Territory, for its own account, 
products incorporating Promising Compounds.

    (c) VERTEX will be undertaking development activities, including 
preclinical and clinical studies and process research, necessary for the 
development of Promising Compounds outside the Territory.  Prior to the 
commencement of the Development Program with respect to a Promising Compound, 
VERTEX and KISSEI will meet to discuss the worldwide development plan with 
respect to that Promising Compound, and will attempt to identify those 
development activities being undertaken for development of the Promising 
Compound outside the Territory (including preclinical and clinical studies 
and process research and development) which will be necessary or useful for 
the registration of products incorporating that Promising Compound in Japan.  
Any such agreed activities are hereinafter referred to as "Core Development 
Activities."  VERTEX expects that those activities will be undertaken 
applying standards (which KISSEI will specifically note to VERTEX if in 
variance with usual and customary development practices and standards in the 
United States) which will allow the results of those activities to be used by 
KISSEI in its regulatory filings in Japan.  VERTEX will provide KISSEI with 
any and all preclinical and clinical data generated by VERTEX from Core 
Development Activities in North America and Europe, and KISSEI shall be free 
to use such data and information solely for the purpose of developing 
Promising Compound(s) in the Territory pursuant hereto.  If KISSEI should 
undertake Core Development Activities with the agreement of VERTEX, VERTEX 
shall be free to use any data and information generated by KISSEI in 
connection therewith solely for the purpose of developing Promising Compounds 
outside the Exclusive Territory. KISSEI shall pay [ * ] Core Development 
Activities.

    2.9  Bulk Supply for Research and Development.  VERTEX will provide 
KISSEI with bulk material for research and development in the Territory with 
respect to Promising Compounds then under development by VERTEX, at [ * ].

                   Research and Development Agreement -- Page 7
 
<PAGE>

    2.10 KISSEI Research.  During the term of the Research Program, KISSEI 
will discuss with and obtain consent from VERTEX or the Research Committee 
prior to engaging in specific research activities in the Field.  VERTEX will 
not unreasonably withhold such consent.

                                     Article III
                                           
                                   KISSEI's Rights
                                           
    3.1  Selection of Promising Compounds.  KISSEI has an exclusive option 
right to select from time to time for development under the Option and Rights 
Agreement referenced below, from Compounds designated by VERTEX for 
development, Promising Compounds in which KISSEI has an interest in 
development, manufacture, marketing and sale in the Territory as a result of 
KISSEI's financial and technical support of the Research Program and the 
Development Program.  During the course of the Research Program and [ * ], 
VERTEX will notify KISSEI if and when it has selected a Compound for 
development in the Field outside the Exclusive Territory, and KISSEI shall 
have ninety (90) days after receipt of such notice (the "Option Notice") from 
VERTEX in which to exercise its option to develop that Compound hereunder.  
VERTEX shall include in any such notice to KISSEI a draft development plan 
for that Compound outside the Territory and an estimate of related 
development costs.  KISSEI's option, if unexercised within the 90-day period, 
shall expire with respect to that Compound; provided that if, at the time of 
receipt of an Option Notice from VERTEX with respect to a Compound, KISSEI is 
then developing a Promising Compound under the Option and Rights Agreement 
(but only for so long as it continues such development), then its option 
under this Section 3.1 with respect to the additional Compound shall extend 
beyond the 90-day period and shall expire only upon the expiration or 
termination of KISSEI's option rights under this Article III.  If KISSEI 
should exercise its option with respect to the additional Compound during the 
extended option period, at a time when, by reason of development activities 
undertaken by VERTEX or its partners outside the Territory subsequent to the 
original option period, the development risks with respect to that Compound 
have been substantially reduced, the parties will discuss an appropriate 
premium to be paid to VERTEX by reason of the accrual of this benefit to 
KISSEI.  Upon exercise of its development option with respect to any such 
Promising Compound, KISSEI will develop that Promising Compound in the 
countries of the Territory in accordance with the terms of the Option and 
Rights Agreement. KISSEI's option rights under this Article III shall expire 
[ * ].

    3.2  Option and Rights Agreement.  The rights of KISSEI upon exercise of 
its option under Section 3.1 above shall be as set forth in the Option and 
Rights Agreement attached hereto as Exhibit A (the "Option and Rights 
Agreement").  Promptly upon exercise of any such option by notice in writing 
from KISSEI to VERTEX, the parties shall execute the Option and Rights 
Agreement for further development, manufacture, marketing and sale in the 
Territory of the Promising Compound to which the option exercise was directed.

                   Research and Development Agreement -- Page 8

<PAGE>

    3.3  Scientific Strategies.   KISSEI may apply scientific strategies 
learned from VERTEX, which are not the subject of patent claims, to drug 
discovery programs in which KISSEI is or may in the future be engaged outside 
of the Research Program.

                                      Article IV
                                           
                                   Confidentiality
                                           
    4.1  Undertaking.  During the term of this Agreement, each party shall 
keep confidential, and other than as provided herein shall not use or 
disclose, directly or indirectly, any trade secrets, confidential or 
proprietary information, or any other knowledge, information, documents or 
materials, owned, developed or possessed by the other party, whether in 
tangible or intangible form, the confidentiality of which such other party 
takes reasonable measures to protect, including but not limited to VERTEX 
Technical Information and KISSEI Technical Information.  Each party shall 
take any and all lawful measures to prevent the unauthorized use and 
disclosure of such information, and to prevent unauthorized persons or 
entities from obtaining or using such information.  Each party further agrees 
to refrain from directly or indirectly taking any action which would 
constitute or facilitate the unauthorized use or disclosure of such 
information.  Each party may disclose such information to its officers, 
employees and agents, and to sublicensees under KISSEI's rights pursuant to 
Section 3.1 hereof, and to subcontractors in connection with the development 
or manufacture of Promising Compounds, to the extent necessary to enable such 
parties to perform their obligations hereunder or under the applicable 
sublicense or subcontract, as the case may be; provided, that such officers, 
employees, agents, sublicensees and subcontractors have entered into 
appropriate confidentiality agreements for secrecy and non-use of such 
information which by their terms shall be enforceable by injunctive relief at 
the instance of the disclosing party.  Each party shall be liable for any 
unauthorized use and disclosure of such information by its officers, 
employees and agents and any such sublicensees and subcontractors.

    4.2  Exceptions.  Notwithstanding the foregoing, the provisions of 
Section 4.1 hereof shall not apply to knowledge, information, documents or 
materials which the receiving party can conclusively establish:  (i) have 
entered the public domain without such party's breach of any obligation owed 
to the disclosing party; (ii) have become known to the receiving party prior 
to the disclosing party's disclosure of such information to such receiving 
party; (iii) are permitted to be disclosed by the prior written consent of 
the disclosing party; (iv) have become known to the receiving party from a 
source other than the disclosing party other than by breach of an obligation 
of confidentiality owed to the disclosing party; (v) are disclosed by the 
disclosing party to a third party without restrictions on its disclosure; 
(vi) are independently developed by the receiving party without breach of 
this Agreement; or (vii) are required to be disclosed by the receiving party 
to comply with applicable laws, to defend or prosecute litigation or to 
comply with governmental regulations, provided that the receiving party 
provides prior written notice of such disclosure to the disclosing party and 
takes reasonable and lawful actions to avoid or minimize the degree of such 
disclosure.

                   Research and Development Agreement -- Page 9

<PAGE>

    4.3  Publicity.  The timing and content of any press releases or other 
public communications relating to the Agreement and the transactions 
contemplated herein will, except as otherwise required by law, be determined 
jointly by KISSEI and VERTEX.

    4.4  Survival.  The provisions of this Article IV shall survive the 
termination of this Agreement.
                                           
                                      Article V
                                           
                                       Patents
                                           
    5.1  Preparation.  VERTEX shall take responsibility for the preparation, 
filing, prosecution and maintenance of any and all patent applications and 
patents in the Territory included in Patents; and shall furnish to KISSEI 
copies of documents relevant to any such preparation, filing, prosecution or 
maintenance.  VERTEX and KISSEI shall otherwise cooperate fully in the 
preparation, filing, prosecution and maintenance of all Patents, executing 
all papers and instruments so as to enable VERTEX to apply for, to prosecute 
and to maintain patent applications and patents in VERTEX's name in any 
country in the Territory.  The parties acknowledge the importance of 
maintaining the confidentiality of any inventions or other information 
relating to potential patent claims prior to the filing of patent 
applications with respect hereto. Each party shall provide to the other 
prompt notice as to all matters which may affect the preparation, filing, 
prosecution or maintenance of any such patent applications or patents.

    5.2  Cost Reimbursement.  KISSEI shall reimburse VERTEX for the following 
patent costs with respect to Patents:  (a) [ * ] its "general patent 
preparation and maintenance costs;" (b) [ * ] the reasonable expenses (other 
than "general patent prosecution and maintenance" costs) which VERTEX has 
incurred, or may in the future incur, for the preparation, filing, 
prosecution and maintenance of Patents in the Semi-Exclusive Territory; and 
(c) [ * ] the reasonable expenses (other than "general patent prosecution and 
maintenance" costs) which VERTEX has incurred, or may in the future incur, 
for the preparation, filing, prosecution and maintenance of Patents in the 
Exclusive Territory.  "General patent preparation and maintenance costs" 
shall include the costs of preparation, filing and prosecution of any patent 
application from which a patent application filed in any country of the 
Territory claims priority, and any patent application filed under the Patent 
Cooperation Treaty (PCT).  VERTEX shall notify KISSEI in writing from time to 
time of its plans with respect to the preparation, filing, prosecution and 
maintenance of Patents in each country in the Territory which are, or have 
not yet become, Promising Patents, together with its estimate of the costs of 
such preparation, filing, prosecution and maintenance and an estimate of 
VERTEX's general patent preparation and maintenance costs.  KISSEI shall 
reimburse VERTEX for [ * ] such reasonable costs, unless it shall notify 
VERTEX in writing, within thirty (30) days after receipt of any such notice 
from VERTEX, that KISSEI does not wish to proceed with cost reimbursement 
with respect to a specific Patent in any specified country in the Territory; 
after which time VERTEX may at its option refrain from, or abandon, the 
preparation, filing, prosecution or maintenance of such Patent in such 
country in the Territory.  In any event, the provisions of Section 5.3 will 

                   Research and Development Agreement -- Page 10

<PAGE>

apply to any patent which is the object of the foregoing notice from KISSEI 
and which VERTEX continues to prosecute or maintain.

    5.3  Failure to Reimburse.  If KISSEI shall fail to reimburse VERTEX as 
required under Section 5.2 above with respect to a patent application or 
patent included within the Patents within sixty (60) days after receipt of a 
written request for payment from VERTEX, VERTEX may terminate KISSEI's rights 
hereunder with respect to that patent or patent application upon thirty (30) 
days written notice thereof to KISSEI, unless KISSEI during such 30 day 
period shall have submitted payment pursuant to the aforementioned request 
for payment.

                                      Article VI
                                           
                                     Infringement
                                           
    KISSEI shall notify VERTEX promptly of any possible infringements, 
unauthorized possession, knowledge or use of the intellectual property 
embodied in any of the Patents by third parties in any country in the 
Territory, of which KISSEI becomes aware.  KISSEI shall promptly furnish 
VERTEX with full details of such infringements, imitations or unauthorized 
possession, knowledge or use, and shall assist in preventing any recurrence 
thereof.  VERTEX shall be initially responsible, at its expense, for bringing 
any action on account of any such infringements, knowledge or use, and KISSEI 
shall cooperate with VERTEX, as VERTEX may reasonably request, in connection 
with any such action.  If, within sixty (60) days after receipt by VERTEX of 
a written request from KISSEI that it bring such an action, VERTEX does not 
do so, KISSEI shall have the right, at its expense and in its own name or in 
the name of VERTEX, to do so on behalf of VERTEX, and VERTEX shall cooperate 
with KISSEI, as KISSEI may reasonably request, in connection with such 
action.  Such suit may not be settled by KISSEI without VERTEX's consent, 
which shall not be unreasonably withheld.  Damages recovered in any actions 
referenced hereunder shall be divided [ * ].

                                     Article VII
                                           
                                 Term and Termination
                                           
    7.1  Term of Agreement.  This Agreement will extend until the termination 
of the Research Program and thereafter until six (6) months after the 
termination of the Research Program, unless earlier terminated by either 
party hereto in accordance with other applicable provisions of this Agreement.

    7.2  Termination of Research Program by KISSEI for Cause.  Upon written 
notice to VERTEX, KISSEI may at its sole option terminate the Research 
Program and this Agreement upon the occurrence of any of the following events:

                   Research and Development Agreement -- Page 11
 
<PAGE>

    (a)  VERTEX shall materially breach this Agreement, which shall include a
    failure to use its reasonable best efforts to pursue the Research Program
    diligently (provided, however, that this shall not be construed as a
    guarantee by VERTEX that the Research Program will be successfully
    completed or any Compounds successfully developed), and such material
    failure to perform shall not have been remedied or steps initiated to
    remedy the same to KISSEI's reasonable satisfaction, within sixty (60) days
    after KISSEI sends written notice of failure to perform to VERTEX.

    (b)  VERTEX shall cease to function as a going concern by suspending or
    discontinuing its business for any reason except for interruptions caused
    by strike, labor dispute or any other events over which it has no control
    (unless termination of this Agreement is permitted under Section 9.3
    hereof); or

    (c)  A receiver for VERTEX shall be appointed or applied for, or a general
    assignment shall be made for the benefit of its creditors or any proceeding
    involving VERTEX shall be voluntarily commenced by it under any bankruptcy,
    reorganization, insolvency, readjustment of debt, dissolution or
    liquidation law or statute of the United States or any state thereof or
    such proceedings shall be involuntarily instituted against it, and VERTEX
    by any action shall indicate its approval of or consent to, or acquiescence
    therein, or the same shall remain undismissed for sixty (60) days.

         In the event of any valid termination under this Section 7.2, KISSEI 
shall not be required to make any payments under Section 2.2 hereof which are 
not due and payable prior to receipt by VERTEX of the notice of failure to 
perform referenced under Section 7.2(a), receipt by VERTEX of the notice of 
termination pursuant to Section 7.2(b), or the occurrence of the event 
referenced in Section 7.2(c) giving rise to KISSEI's right to terminate 
thereunder, as the case may be.  Notwithstanding the foregoing, any Option 
and Rights Agreement then in effect under the provisions of Article III of 
this Agreement shall continue in effect in accordance with its terms.

    7.3  Termination of the Research Program by KISSEI Without Cause.  KISSEI 
may, at its sole discretion and for any reason or no reason, terminate the 
Research Program and this Agreement by six months' prior written notice 
delivered to VERTEX at any time on or after 30 June 1998.  In such event, 
KISSEI shall make all of the payments specified in Section 2.2 hereof which 
are due and payable before the effective date of such termination, but shall 
not be required to make any payment which is due and payable on or after the 
effective date of termination.  Notwithstanding the foregoing, all payments 
that would have been due under Section 2.2, absent termination by KISSEI, 
shall become immediately due and payable to VERTEX if, [ * ] KISSEI proceeds 
with substantial research relating to, or development of, a compound or 
pharmaceutical product for the treatment of chronic inflammation or 
neurodegeneration which acts in whole or in part through inhibition of a MAP 
kinase enzyme.  Any Option and Rights Agreement then in effect under the 
provisions of Article  

                   Research and Development Agreement -- Page 12

<PAGE>

III hereof shall automatically terminate upon the effective date of any 
termination under this Section 7.3.

    7.4  Termination by VERTEX.  In addition to rights of termination which 
may be granted to VERTEX under other provisions of this Agreement, VERTEX may 
terminate this Agreement upon sixty (60) days prior written notice to KISSEI 
upon the material breach by KISSEI of any of its obligations under this 
Agreement, provided that such termination shall become effective only if 
KISSEI shall fail to remedy or cure the breach within such sixty (60) day 
period.

    7.5  Effect of Termination.  Termination of this Agreement for any 
reason, or expiration of this Agreement, will not affect:  (i) obligations 
which have accrued as of the date of termination or expiration, and (ii) 
obligations and rights which, from the context thereof, are intended to 
survive termination or expiration of this Agreement.

                                     Article VIII
                                           
                                  Dispute Resolution
                                           
    8.1  Governing Law, and Jurisdiction.  This Agreement shall be governed 
and construed in accordance with the internal laws of the Commonwealth of 
Massachusetts.  Both parties hereto agree to submit to personal jurisdiction 
in the Commonwealth of Massachusetts and to accept and agree to venue in that 
State.

    8.2  Arbitration.  In the event of any controversy or claim arising out 
of or relating to any provision of this Agreement or the breach thereof, the 
parties shall try to settle their differences amicably between themselves.  
Any such controversy or claim which the parties are unable to resolve shall, 
upon the written request of one party delivered to the other party, be 
submitted to and be settled by arbitration in Boston, Massachusetts, in 
accordance with the rules of the American Arbitration Association (the "AAA") 
then in effect (except as hereinafter stated), and judgment upon the award 
rendered by the arbitrators may be entered in any court having jurisdiction 
thereof.  Notwithstanding anything to the contrary which may be contained in 
the rules of the AAA, the parties further agree as follows:
    
    (i)  Each party will appoint one person who may be approved by the AAA to
         hear and determine the dispute within fifteen (l5) days after receipt
         of notice of arbitration from the noticing party.  The two persons so
         chosen will select a third impartial arbitrator, and their majority
         decision will be final and conclusive upon the parties hereto.  If
         either party fails to designate its arbitrator within fifteen (l5)
         days after delivery of the notice provided for herein, then the
         arbitrator designated by the one party will act as sole arbitrator,
         and will be deemed to be the single, mutually approved arbitrator to
         resolve the controversy.  In the event the parties are unable to agree
         upon a rate of compensation for the arbitrators, they will be
         compensated for their services at a rate to be determined by the AAA.
    
                   Research and Development Agreement -- Page 13

<PAGE>

    (ii) The parties shall enjoy, but are not limited to, the same rights to
         discovery as they would enjoy under the Federal Rules of Civil
         Procedure for the district in which the City of Boston is located.
    
    (iii)Each party will bear its own costs, including attorneys' fees, in
         the arbitration, and will share equally the cost of the arbitrators.
    
    (iv) The arbitrators will, upon the request of either party, issue a
         written opinion of their findings of fact and conclusions of law and
         shall deliver a copy of such opinion to both parties.
    
    (v)  Upon receipt of said written opinion, either party will have the
         right, within fifteen (l5) days thereof, to file with the arbitrators
         a motion to reconsider, and the arbitrators thereupon will reconsider
         the issues raised by said motion and either confirm or alter their
         decision, which will then be final and conclusive upon both parties
         hereto.  The costs of such a motion for reconsideration and written
         opinion of the arbitrators, including attorneys' fees, will be paid by
         the non-prevailing party.  Any motion to reconsider shall be sent to
         the other party at the time it is filed with the arbitrators.
    
    
                                      Article IX
                                           
                               Miscellaneous Provisions
                                           
    9.1  Official Language.  English shall be the official language of this 
Agreement and the Option and Rights Agreement, and all communications between 
the parties hereto shall be conducted in that language.

    9.2  Waiver.  Any waiver by either party of the breach of any term or 
condition of this Agreement will not be considered as a waiver of any 
subsequent breach of the same or any other term or condition hereof.

    9.3  Force Majeure.  Neither party will be in breach hereof by reason of 
its delay in the performance of or failure to perform any of its obligations 
hereunder, if that delay or failure is caused by strikes, acts of God or the 
public enemy, riots, incendiaries, interference by civil or military 
authorities, compliance with governmental priorities for materials, or any 
fault beyond its control or without its fault or negligence.  Notwithstanding 
the foregoing, in the event that any delay or failure to perform by VERTEX by 
reason of force majeure shall extend beyond six months, KISSEI may suspend 
any payments which would otherwise become due and payable to VERTEX during 
the next succeeding six month period under Section 2.2 hereof, and may 
terminate this Agreement upon notice in writing to VERTEX if such delay or 
failure to perform continues beyond such succeeding six (6) month period; 
provided, that any suspended payments shall immediately be made by KISSEI 
upon the earlier of (a) the resumption of normal operations  

                   Research and Development Agreement -- Page 14

<PAGE>

by VERTEX during such succeeding six (6) month period, or (b) if KISSEI does 
not exercise its right to terminate this Agreement under this Section 9.3 
within fifteen (15) days after the conclusion of this one year period.  In 
the case of the occurrence of force majeure which extends or is anticipated 
to extend beyond six (6) months, both parties to this Agreement, so far as 
circumstances will permit, will meet and discuss the possibility of extending 
this Agreement, on terms acceptable to both parties.

    9.4  Severability.  In the event that any provision of this Agreement, or 
any part hereof, is found invalid or unenforceable, the remainder of this 
Agreement will be binding on the parties hereto, and will be construed as if 
the invalid or unenforceable provision or part thereof had been deleted from 
this Agreement.

    9.5  Government Acts.  In the event that any act, regulation, directive, 
or law of the government of a country within the Territory, including its 
departments, agencies or courts, should make impossible or prohibit, 
restrain, modify or limit any material act or obligation of KISSEI or VERTEX 
under this Agreement, the party, if any, not so affected, shall have the 
right, at its option, to suspend or terminate this Agreement as to such 
country.

    9.6  Government Approvals.  KISSEI and its sublicensees will obtain any 
government approval required in the Territory to enable this Agreement to 
become effective, or to enable any payment hereunder to be made, or any other 
obligation hereunder to be observed or performed.  Each party will keep the 
other informed of progress in obtaining any such government approval, and 
will cooperate with the other party in any such efforts.

    9.7  Export Controls.  This Agreement is made subject to any restrictions 
concerning the export of Promising Compounds or VERTEX Technical Information 
from the United States which may be imposed upon or related to either party 
to this Agreement from time to time by the Government of the United States. 
Furthermore, KISSEI will not export, directly or indirectly, any VERTEX 
Technical Information or any Promising Compounds utilizing such Technical 
Information to any countries for which the United States Government or any 
agency thereof at the time of export requires an export license or other 
governmental approval, without first obtaining the written consent to do so 
from the Department of Commerce or other agency of the United States 
Government when required by applicable statute or regulation.

    9.8  Assignment.  KISSEI will not have the right to assign this Agreement 
without the prior written consent of VERTEX, which shall not be unreasonably 
withheld, except to one of KISSEI's Affiliates.  VERTEX is free to assign 
this Agreement to any of its Affiliates, and, with KISSEI's written consent, 
which shall not be unreasonably withheld, to any entity which shall assume 
any and all of VERTEX's obligations hereunder.

    9.9  Counterparts.  This Agreement may be executed in duplicate, each of 
which shall be deemed to be original and both of which shall constitute one 
and the same Agreement.

    9.10 No Agency.  Notwithstanding any of the provisions of this Agreement, 
neither party to this Agreement shall at any time enter into, incur, or hold 
itself out to third parties as  

                   Research and Development Agreement -- Page 15

<PAGE>

having authority to enter into or incur, on behalf of the other party, any 
commitment, expense, or liability whatsoever, and all contracts, expenses and 
liabilities in connection with or relating to the obligations of each party 
under this Agreement shall be made, paid, and undertaken exclusively by such 
party on its own behalf and not as an agent or representative of the other.

    9.11 Notice.  All communications between the parties with respect to any 
of the provisions of this Agreement will be sent to the addresses set out 
below or to other addresses as notified by the parties for the purpose of 
this clause, by prepaid certified air mail (which shall be deemed received by 
the other party on the seventh business day following deposit in the mails), 
or by cable, telex, facsimile transmission, or other electronic means of 
communication (which shall be deemed received when transmitted), with 
confirmation by first class letter, postage pre-paid, given by the close of 
business on or before the next following business day:
         
         if to KISSEI,  at:

                        19-48 Yoshino Matsumoto-City
                        Nagano-Pref. 399 Japan
                        Attention:  Yukiyoshi Ajisawa
                        Board Director 
                        Discovery Research, R&D

                        Attention:  Director of Legal Department

         if to VERTEX, at:
    
                        130 Waverly Street
                        Cambridge, MA 02139-4242
                        Attention:  Richard H. Aldrich
                        Senior Vice President and Chief Business Officer

    9.12 Headings.  The paragraph headings are for convenience only and will 
not be deemed to affect in any way the language of the provisions to which 
they refer.

    9.13 Authority.  The undersigned represent that they are authorized to 
sign this Agreement on behalf of the parties hereto.  The parties each 
represent that no provision of this Agreement will violate any other 
agreement that a party may have with any other person or company.  Each party 
has relied on that representation in entering into this Agreement.

    9.14 Entire Agreement.  This Agreement contains the entire understanding 
of the parties relating to the matters referred to herein, and may only be 
amended by a written document, duly executed on behalf of the respective 
parties.

    9.15 Competition.  During the term of this Agreement, neither VERTEX (in 
the Territory) nor KISSEI (worldwide) will develop, manufacture or sell small 
molecule compounds or pharmaceutical products containing small molecule 
compounds which have as their principal 

                   Research and Development Agreement -- Page 16

<PAGE>

mode of action inhibition of the p38 kinase enzyme, other than under the 
terms of this Agreement.

                                  VERTEX PHARMACEUTICALS INCORPORATED


                                  By:  /s/ Joshua Boger                   
                                     -------------------------------------

                                  Title: Chairman, President & CEO        
                                        ----------------------------------


                                  Date of Signature:  September 10, 1997  
                                                    ----------------------
    


                                  KISSEI PHARMACEUTICAL CO., LTD.


                                  By: /s/ Mutosuo Kanzawa                 
                                     -------------------------------------

                                  Title: President C.E.O.                 
                                        ----------------------------------


                                  Date of Signature:  September 10, 1997  
                                                    ----------------------
    
                                           
                   Research and Development Agreement -- Page 17
                                           

<PAGE>

                                   SCHEDULE I
 
                 LIST OF VERTEX PATENT APPLICATIONS AND PATENTS
                       RELATED TO P38 MAP KINASE PROGRAM
 
                                U.S. DISCLOSURES
 
<TABLE>
<CAPTION>
                                                                        FILING DATE   APPLICATION
                                                                          OR ISSUE     OR PATENT     EXPIRATION
DOCKET NO.                    INVENTOR(S)      TITLE         STATUS         DATE          NO.           DATE
- ----------------------------  ------------  ------------  ------------  ------------  ------------  ------------
<S>                           <C>           <C>           <C>           <C>           <C>           <C>
[ * ]

[ * ]

[ * ]

[ * ]

[ * ]
</TABLE>


<PAGE>
 
                                     Schedule II
                                           
                           p38 MAP Kinase Inhibitor Program
                    Summary of Research Activities  -- 1996 - 1999
                                           
                                           
                                        [ * ]
                                           

<PAGE>
                                           
                                            
                                     Schedule III
                                           
                              Countries in the Territory
                                           
- ------------------------------------------------------------------------------
                                           
    A. The Exclusive Territory:

         [ * ]
         
         
         Japan
         
         
         [ * ]
         
         
         
    B.  The Semi-Exclusive Territory
         
         China
         Korea 
         Taiwan


<PAGE>







                                      Exhibit A

                             Option and Rights Agreement


                                       between


                         Vertex Pharmaceuticals Incorporated

                                         and

                           Kissei Pharmaceutical Co., Ltd.

 
<PAGE>

                         Option and Rights Agreement
                              TABLE OF CONTENTS

- ------------------------------------------------------------------------------
                                                                          Page

INTRODUCTION .............................................................. 1

ARTICLE I -- Definitions .................................................. 1

1.1   "Affiliate" ......................................................... 1
1.2   "Field" ............................................................. 1
1.3   "Compounds" ......................................................... 1
1.4   "Promising Compounds" ............................................... 2
1.5   "Promising Processes" ............................................... 2
1.6   "Promising Patents" ................................................. 2
1.7   "Research Program" .................................................. 2
1.8   "Research and Development Agreement" ................................ 2
1.9   "Development Program" ............................................... 2
1.10  "KISSEI Technical Information" ...................................... 2
1.11  "VERTEX Technical Information" ...................................... 2
1.12  "Exclusive Territory" ............................................... 3
1.13  "Semi-Exclusive Territory" .......................................... 3
1.14  "Territory" ......................................................... 3
1.15  "Effective Date" .................................................... 3
1.16  "Net Sales" ......................................................... 3
1.17  "Manufacturing Cost" ................................................ 4

ARTICLE II -- KISSEI'S Rights ............................................. 4

2.1   Rights .............................................................. 4
2.2   Technical Information ............................................... 5
2.3   Information Transfer ................................................ 5
2.4   Due Diligence ....................................................... 5
2.5   Development ......................................................... 5
2.6   Termination ......................................................... 6
2.7   Grantback ........................................................... 6

Article III -- Supply ..................................................... 7

3.1   Commercial Supply Option ............................................ 7
3.2   Supply Price for Commercial Material ................................ 7
      
Article IV -- Royalties ................................................... 8
      
4.1   Royalty ............................................................. 8
4.2   Payment ............................................................. 9
      
Article V -- Reporting .................................................... 9
      
5.1   Development Reports ................................................. 9
5.2   Sales Reports and Records ........................................... 9
5.3   Exchange of Information ............................................. 9
5.4   Payment Delay ....................................................... 10
      
                                     -i-

<PAGE>
                              TABLE OF CONTENTS
                                 (Continued)

- ------------------------------------------------------------------------------
                                                                          Page

Article VI -- Confidentiality ............................................. 10
                                             
6.1   Undertaking ......................................................... 10
6.2   Exceptions .......................................................... 10
6.3   Survival ............................................................ 11
                                             
Article VII -- Patents .................................................... 11
                                             
7.1   Preparation ......................................................... 11
7.2   Cost Reimbursement .................................................. 11
7.3   Assignment .......................................................... 11
7.4   Failure to Reimburse ................................................ 11
      
Article VIII -- Infringement .............................................. 11
      
Article IX-- Dispute Resolution ........................................... 12

9.1   Governing Law; Jurisdiction ......................................... 12
9.2   Arbitration ......................................................... 12
       
Article X-- Term and Termination .......................................... 13

10.1  Term ................................................................ 13
10.2  Termination ......................................................... 13
10.3  Effect of Termination ............................................... 13

Article XI -- Miscellaneous Provisions .................................... 14

11.1  No Warranty ......................................................... 14
11.2  Third Party Actions ................................................. 14
11.3  Waiver .............................................................. 14
11.4  Force Majeure ....................................................... 14
11.5  Severability ........................................................ 14
11.6  Government Acts ..................................................... 15
11.7  Government Approvals ................................................ 15
11.8  Export Controls ..................................................... 15
11.9  Assignment .......................................................... 15
11.10 Counterparts ........................................................ 15
11.11 No Agency ........................................................... 15
11.12 Competition ......................................................... 15
11.13 Notice .............................................................. 15
11.14 Headings ............................................................ 16
11.15 Authority ........................................................... 16

SCHEDULE I -- Promising Compounds, Processes and Patents

                                     -ii-

<PAGE>


                                      Exhibit A
                                           
                             Option and Rights Agreement
                                           

    This Agreement is made and entered into as of ________________ between 
Vertex Pharmaceuticals Incorporated (hereinafter "VERTEX"), a Massachusetts 
corporation, and Kissei Pharmaceutical Co., Ltd. (hereinafter "KISSEI"), a 
Japanese corporation.

                                     Introduction
                                           
    WHEREAS, VERTEX and KISSEI are parties to a certain Research and 
Development Agreement dated 10 September 1997 (the "Research and Development 
Agreement") under which VERTEX is attempting to design and discover novel 
small molecule inhibitors of the p38 enzyme, with the financial and technical 
assistance of KISSEI; and

    WHEREAS, VERTEX is the owner of the entire right, title and interest in 
the Promising Patents (as defined below); and

    WHEREAS, KISSEI wishes to obtain an exclusive option right to practice 
the invention covered by the Promising Patents in the Territory (as defined 
below) and to develop, use and sell in the commercial market the Promising 
Compounds and the products made in accordance therewith; and

    WHEREAS, VERTEX agrees to such exclusive option right of KISSEI in 
accordance with the terms of this Agreement.

    NOW THEREFORE, in consideration of the foregoing premises, the parties 
agree as follows:

                                      Article I
                                           
                                     Definitions
                                            
    1.1. "Affiliate" shall mean at any time, any person or legal entity, then 
directly or indirectly controlled by, controlling or under common control 
with the party with respect to which this term is associated, and shall 
include any person or legal entity which owns, either of record or 
beneficially, 50% or more of the voting stock of any party hereto, or 50% or 
more of the voting stock of which is owned by any party hereto.

    1.2. "Field" shall mean human use of Compounds in the diagnosis, 
prevention and treatment of acute and chronic inflammation and 
neurodegeneration.

    1.3. "Compounds" shall have the meaning ascribed to it in the Research 
and Development Agreement. 

                    Option and Rights Agreement -- Page 1

<PAGE>

    1.4.  "Promising Compounds" shall mean any Compounds as to which the 
option rights granted under Article III of the Research and Development 
Agreement have been exercised in accordance therewith by KISSEI as identified 
on Schedule I hereto, as Schedule I may be updated from time to time by 
reason of the subsequent exercise by KISSEI of such option rights with 
respect to additional Compounds.

    1.5. "Promising Processes" shall mean any processes resulting from the 
Research Program as to which the option under Article III of the Research and 
Development Agreement has been exercised in accordance therewith by KISSEI, 
as identified on Schedule I hereto, as Schedule I may be updated from time to 
time by reason of the subsequent exercise by KISSEI of such option rights 
with respect to additional processes.

    1.6. "Promising Patents" shall mean the Patents or patent applications 
claiming a Promising Compound, a Promising Process, or a method of 
manufacturing or using a Promising Compound, as to which the option under 
Article III of the Research and Development Agreement has been exercised in 
accordance therewith by KISSEI, as identified on Schedule I hereto and as 
Schedule I may be updated from time to time by reason of the subsequent 
exercise by KISSEI of such option with respect to additional patents, and 
shall include any continuations, continuations-in-part, or divisions of such 
patents or patent applications or any substitute applications therefor.  
VERTEX shall keep KISSEI currently informed in writing of additions and 
amendments to Schedule I.

    1.7. "Research Program" shall have the meaning ascribed to it in the 
Research and Development Agreement.

    1.8. "Research and Development Agreement" shall mean that certain 
Research and Development Agreement dated 10 September 1997 by and between 
VERTEX and KISSEI.

    1.9. "Development Program" shall mean activities associated with 
development of Promising Compounds for sale, including but not limited to (a) 
selection of clinical trial candidates from among lead Compounds and 
preparation for preclinical assessment thereof; (b) formulation of the 
Promising Compounds for use in preclinical studies; (c) preclinical animal 
studies performed in accordance with "Good Laboratory Practices" (or the 
applicable equivalent) in preparation for the filing of an Investigative New 
Drug Application (or the applicable equivalent); (d) manufacture of Promising 
Compounds for preclinical and clinical studies; (e) planning, implementation, 
evaluation and administration of human clinical trials; (f) manufacturing 
process development and scale-up; and (g) preparation and submission of 
applications for regulatory approval.

    1.10.     "KISSEI Technical Information" shall mean all know-how, 
proprietary information, or special knowledge of KISSEI relating to the 
research, development, utilization, manufacture, or use of any Promising 
Compounds, or Promising Processes, including but not limited to processes, 
techniques, methods, products, materials, and compositions.

    1.11.     "VERTEX Technical Information" shall mean all know-how, 
proprietary information, or special knowledge of VERTEX relating to the 
research, development, utilization,  

                    Option and Rights Agreement -- Page 2

<PAGE>

manufacture, or use of any Promising Compounds, or Promising Processes, 
including but not limited to processes, techniques, methods, products, 
materials, and compositions.

    1.12.     "Exclusive Territory" shall mean those countries identified on 
Schedule III of the Research and Development Agreement as comprising the 
exclusive territory.

    1.13.     "Semi-Exclusive Territory" shall mean those countries 
identified on Schedule III of the Research and Development Agreement as 
comprising the semi-exclusive territory.

    1.14.     "Territory" shall mean the Exclusive Territory and the 
Semi-Exclusive Territory.

    1.15.     "Effective Date" shall mean the date on which this Agreement 
enters into effect pursuant to Section 3.2 of the Research and Development 
Agreement.

    1.16.     "Net Sales" shall mean
                                            
                                            
              [ * ]

         (a)  Customary trade, quantity or cash discounts and non-affiliated
              brokers' or agents' commissions actually allowed and taken;

         (b)  Amounts repaid or credited by reason of rejection or return;
              and/or

         (c)  To the extent separately stated on purchase orders, invoices or
              other documents of sale, taxes levied on and/or other government
              charges made as to production, sale, transportation, delivery or
              use and paid by or on behalf of KISSEI;
                                       
         (d)  Freight insurance and handling charges.
                                       
         provided that

         1.16.1.   in the case of any sale or other disposal by a party thereto
                   to an Affiliate, the Net Sales shall be calculated as above
                   on the value charged or invoiced on the first arm's length
                   sale to a party who is not an Affiliate;

         1.16.2.   in the event of a sublicense as to any Promising Compound,
                   Net Sales will be calculated with respect to arms-length
                   sales by the sublicensee. 

                    Option and Rights Agreement -- Page 3

<PAGE>

         1.16.3.   in the case of any other sale or other disposal, such as
                   barter or counter-trade, of any Promising Compounds, or
                   Promising Processes, or part thereof, otherwise than in an
                   arm's length transaction exclusively for money, the Net
                   Sales shall be calculated as above on the fair market price
                   (if higher) in the relevant country of sale or disposal.]

    1.17.     "Manufacturing Cost" shall mean 

    [ * ]


                                      Article II
                                           
                                   KISSEI's Rights

    2.1. Rights.  KISSEI has the sole and exclusive right, even as to VERTEX
(but subject to the rights of VERTEX under Article III hereof), under the
Promising Patents to develop, make, have made, use or sell Promising Compounds
in the Exclusive Territory and to practice the Promising Processes to develop,
make, have made, use or sell Promising Compounds in the Exclusive Territory. 
KISSEI shall have the sole and exclusive right, except as to VERTEX, under the
Promising Patents to develop, make, have made, use or sell Promising Compounds
in the Semi-Exclusive Territory and to practice the Promising Processes to
develop, make, have made, use or sell Promising Compounds in the Semi-Exclusive
Territory.  VERTEX shall retain the right to develop, make, have made, use or
sell Promising Compounds, and to practice the Promising Processes in connection
therewith, in the Semi-Exclusive Territory.  KISSEI shall have the right to
grant sublicenses under the Promising Patents to not more than one sublicensee
in each country in the Territory, to develop, use and sell Promising Compounds
in the Territory on terms not inconsistent with this Agreement, provided that
KISSEI shall forthwith notify VERTEX of the grant of any such sublicense,
together with the name and address of any such sublicensee, shall provide VERTEX
with a summary of the terms of any such sublicense, and any consideration
received therefor, shall promptly take all reasonable steps in the event of the
breach of any such sublicense by the sublicensee to enforce the same, and in the
event of a breach of any such sublicense shall, if so requested by VERTEX,
terminate that sublicense in accordance with the procedures prescribed therein. 
Any such sublicense shall be entered into by KISSEI and the sublicensee on an
arms-length basis. If VERTEX so requests, KISSEI shall make available to VERTEX
for its review a complete copy of any of KISSEI's agreements that grant a
sublicense under the Promising Patents and Promising Processes.  VERTEX shall
have the right to grant a sublicense of its rights under the Promising Patents
to not more than one sublicensee in each country in the Semi-Exclusive
Territory.  Prior to the grant of any such sublicense, VERTEX will discuss the
proposed sublicense and the suitability of the proposed sublicensee with KISSEI.

                    Option and Rights Agreement -- Page 4


<PAGE>

    2.2. Technical Information.  VERTEX hereby grants to KISSEI the right to 
use VERTEX Technical Information throughout the Territory to develop, 
manufacture, and sell Promising Compounds and to permit any sublicensees or 
subcontractors to use VERTEX Technical Information for such purposes pursuant 
to provisions safeguarding confidentiality equivalent to those provided in 
this Agreement.  If VERTEX or KISSEI become aware of any technical 
information which may be useful in the development, manufacture or sale of 
Promising Compounds, they will cooperate in a mutual attempt to gain access 
to that information.

    2.3. Information Transfer.  At such time as VERTEX and KISSEI shall enter 
into this Agreement with respect to a Promising Compound, VERTEX shall 
deliver to KISSEI all information which is necessary or useful for further 
development, manufacture and commercial exploitation and distribution of the 
Promising Compound in the Exclusive Territory.  This information shall 
include copies of all patents, patent applications, copyrights, copyright 
registrations and applications therefor and all other manifestations of the 
intellectual property embodied in the Promising Compound, whether in human or 
machine readable form.

    2.4. Due Diligence.  KISSEI shall promptly commence a Development Program 
with respect to the Promising Compounds and use its best efforts to effect 
introduction of the Promising Compounds (or other Compounds which become the 
subject of KISSEI's rights under the Research and Development Agreement) into 
the commercial market in the Territory as soon as practicable consistent with 
the requirements of the Development Program and sound and reasonable business 
practices and judgment.  In the normal course of development, a certain 
Promising Compound may be dropped from development and replaced within a 
reasonable time with an improved or another Promising Compound, and such 
occurrence in the Development Program shall not constitute a failure of due 
diligence.  Thereafter, until the expiration of this Agreement, KISSEI shall 
endeavor to keep Promising Compounds (or other Compounds which become the 
subject of KISSEI's rights under Article III of the Research and Development 
Agreement) reasonably available to the public through the commercial market.

    2.5. Development.  (a) KISSEI will have the exclusive right and 
obligation to develop and sell Promising Compounds in the Exclusive 
Territory, including without limitation the obligation to initiate and 
complete any preclinical and clinical studies required to obtain regulatory 
approval of Promising Compounds in the Exclusive Territory and shall bear all 
costs of the Development Program for Promising Compounds in the Exclusive 
Territory.

    (b) KISSEI will have exclusive rights to develop, manufacture and sell 
Promising Compounds in the Semi-Exclusive Territory, but subject to the right 
of VERTEX, or not more than one licensee of VERTEX in any country in the 
Semi-Exclusive Territory, also to develop, manufacture or sell Promising 
Compounds in the Semi-Exclusive Territory.  The parties will seek to 
coordinate their respective development activities in the Semi-Exclusive 
Territory under a mutually agreeable co-development arrangement.  Except as 
otherwise stated in a mutually agreeable co-development agreement, each party 
will bear the cost of its own development activities in the Semi-Exclusive 
Territory, except as set forth below with respect to Core Development 
Activities, and will have the right to market and sell in the Semi-Exclusive 
Territory, for its own account, products incorporating Promising Compounds.

                    Option and Rights Agreement -- Page 5

<PAGE>

                                           
    (c) VERTEX will be undertaking development activities, including 
preclinical and clinical studies and process research, necessary for the 
development of Promising Compounds outside the Territory.  Prior to the 
commencement of the Development Program with respect to a Promising Compound, 
VERTEX and KISSEI will meet to discuss the worldwide development plan with 
respect to that Promising Compound, and will attempt to identify those 
development activities being undertaken for development of the Promising 
Compound outside the Territory (including preclinical and clinical studies 
and process research and development) which will be necessary or useful for 
the registration of products incorporating that Promising Compound in Japan.  
Any such agreed activities are hereinafter referred to as "Core Development 
Activities."  VERTEX expects those activities will be undertaken applying 
standards (which KISSEI will specifically note to VERTEX if in variance with 
usual and customary development practices and standards in the United States) 
which will allow the results of those activities to be used by KISSEI in its 
regulatory filings in Japan.  VERTEX will provide KISSEI with any and all 
preclinical and clinical data generated by VERTEX from Core Development 
Activities in North America and Europe, and KISSEI shall be free to use such 
data and information solely for the purpose of developing Promising 
Compound(s) in the Territory pursuant hereto.  If KISSEI should undertake 
Core Development Activities with the agreement of VERTEX, VERTEX shall be 
free to use any data and information generated by KISSEI in connection 
therewith solely for the purpose of developing Promising Compounds outside 
the Exclusive Territory. KISSEI shall pay [ * ] Core Development Activities.
                                           
    2.6. Termination.  VERTEX shall have the right to terminate or render 
non-exclusive KISSEI's Rights hereunder upon thirty (30) days written notice 
to KISSEI if, in VERTEX's reasonable judgment, KISSEI is not demonstrably and 
diligently engaged in development, manufacturing, or marketing programs, as 
appropriate, directed toward placing Promising Compounds hereunder into 
commercial use in Japan, or, following product introduction in Japan, is not 
keeping Promising Compounds reasonably available to the public in such 
country. In making this determination VERTEX shall take into account the 
normal course of such programs conducted with sound and reasonable business 
practices and judgment.  VERTEX shall also have the right to terminate or 
render this right non-exclusive in any other country in the Territory at any 
time upon thirty (30) days written notice to KISSEI if, within  [ * ] from 
the date of regulatory approval for the sale of the Promising Compound(s) in 
Japan, KISSEI has not put the Promising Compound(s) into commercial use in 
such other country, or following initial product introduction in such country 
is not keeping the Promising Compound(s) reasonably available to the public, 
unless KISSEI is demonstrably and diligently engaged in development, 
manufacturing or marketing programs as appropriate, directed toward placing 
the Promising Compound(s) into commercial use in such country as aforesaid.

    2.7. Grantback.  KISSEI shall keep VERTEX fully advised of any 
improvements made by KISSEI or any of its Affiliates, sublicensees  and 
subcontractors relating to Promising Compounds and Promising Processes during 
the term of the Research Program and the Development Program, whether 
patentable or not ("KISSEI Improvements").  KISSEI shall assign to VERTEX all 
of its rights to any such KISSEI Improvements and any such KISSEI 
Improvements shall be considered Promising Compounds and/or VERTEX Technical 
Information and subject to KISSEI's rights hereunder with respect thereto, 
and KISSEI will seek to obtain similar rights in favor of VERTEX for any such 
Improvements generated or made available to it by its Affiliates, 
sublicensees and subcontractors, if any.  VERTEX shall seek to  

                    Option and Rights Agreement -- Page 6

<PAGE>


obtain rights hereunder for KISSEI in the Territory for any such improvements 
generated or made available to VERTEX by its other licensees, if any.

                                     Article III

                                        Supply

    3.1. Commercial Supply Option.  VERTEX shall have the option to 
manufacture or have manufactured and to supply KISSEI and its sublicensees 
with their entire commercial requirements for bulk Promising Compound in the 
Territory (the "Commercial Supply Option").  The Commercial Supply Option 
with respect to a particular Promising Compound will be exercisable upon 
written notice delivered by VERTEX to KISSEI no later than (a) the date of    
   [ * ] with respect to such Promising Compound, following written notice of 
such commencement date delivered to VERTEX by KISSEI not less than six (6) 
months prior thereto which makes specific mention of this Commercial Supply 
Option, and (b) the delivery to VERTEX by KISSEI of a reasonably detailed 
general plan for the final development and marketing of the Promising 
Compound in each country in the Territory.  If VERTEX exercises the 
Commercial Supply Option, KISSEI, its Affiliates and sublicensees shall 
purchase all of their respective requirements of bulk Promising Compound from 
VERTEX for manufacture of products containing Promising Compounds for sale in 
the Territory.  

    3.2. Supply Price for Commercial Material.  If VERTEX exercises the 
Commercial Supply Option set forth in Section 3.1: (a) the supply price for a 
unit of bulk Promising Compound supplied by VERTEX for the manufacture of 
products sold in Japan shall be 



[ * ]


                    Option and Rights Agreement -- Page 7

<PAGE>

    [ * ]

Annual Net Sales shall be calculated on a calendar year basis.

         (b)  the purchase price for each unit of bulk Promising Compound 
supplied to KISSEI for sale in Japan shall initially be calculated during any 
year based on  [ * ] , which shall be provided by KISSEI to VERTEX within 
sixty (60) days prior to commencement of that year and which shall be 
reasonably acceptable to VERTEX.  Forecasts shall be updated quarterly to 
reflect actual experience, and prices for bulk Promising Compound for sale in 
Japan will be recalculated accordingly, based on any material changes in the 
forecast. Payments due to VERTEX based upon that forecasted price shall be 
made within thirty days of receipt from VERTEX of an invoice for bulk 
promising Compound purchased by KISSEI, and annual adjustments shall be made 
within such time periods and applying such procedures as the parties may 
agree to reflect the actual Net Sales in the Territory and the actual 
Applicable Percentage for that year.  Any net adjustments shall be remitted 
forthwith to the party to whom the adjustment is due.

         (c)  the supply price for a unit of bulk Promising Compound supplied 
by VERTEX for the manufacture of products by KISSEI, its Affiliates or 
sublicensees sold in countries of the Territory other than Japan shall equal 
[ * ].

         (d)  all bulk Promising Compound supplied by VERTEX to KISSEI 
hereunder shall be provided under the terms of a supply agreement containing 
terms and conditions, in addition to those provided herein, which are usual 
and customary in the trade, as shall be agreed in good faith between the 
parties hereto.

         (e)  the amounts payable under this Article III are net of any 
applicable duties, government charges, withholding taxes or similar items, if 
any.  

                                           
                                      Article IV
                                           
                                      Royalties
                                           
    4.1. Royalty.  KISSEI shall pay VERTEX a [ * ] royalty on Net Sales of 
products containing Promising Compounds sold during the effective time of 
this Agreement in the countries of the Territory other than Japan.  In 
countries other than Japan where KISSEI obtains a royalty (or equivalent) 
from a sublicensee in excess of [ * ] sold during the effective time of this 
Agreement, KISSEI shall pay VERTEX [ * ] excess amount, as an additional 
royalty.  If VERTEX does not exercise its commercial supply option with 
respect to a Promising Compound, VERTEX will provide KISSEI with all 
manufacturing information in its possession concerning that Promising 
Compound, and KISSEI will pay VERTEX a [ * ] royalty on Net Sales of products 
sold in Japan during the effective time of this Agreement containing that 
Promising Compound. 

                    Option and Rights Agreement -- Page 8

<PAGE>

    4.2. Payment.  All payments from KISSEI to VERTEX under this Article IV 
shall be made by wire transfer in U.S. dollars on a quarterly basis along 
with delivery to VERTEX of the Sales Report referenced in Article V hereof.  
The rates of exchange for such payments shall be the Telegraphic Transfer 
Selling rate ("TTS") of the Fuji Bank in Tokyo, Japan on the day and time of 
remittance.

                                      Article V
                                           
                                      Reporting
                                           
    5.1. Development Reports.  KISSEI shall prepare and submit to VERTEX, on a
quarterly basis, reports which set forth in reasonable detail the progress of
the Development Program and the results of work performed thereunder during the
preceding quarter.  Vertex shall also report to KISSEI on a quarterly basis the
results of any development work which it may have undertaken with respect to
Promising Compounds during the preceding quarter.

    5.2. Sales Reports and Records.  During the term of this Agreement and 
after the first commercial sale of a product containing a Promising Compound, 
KISSEI shall deliver to VERTEX within 45 days after the end of each calendar 
quarter a written report showing KISSEI's computation of amounts due under 
this Agreement on Net Sales by KISSEI, its Affiliates and sublicensees during 
such calendar quarter and on account of the supply of bulk Promising Compound 
to KISSEI hereunder.  All Net Sales shall be divided in each such report into 
sales by KISSEI and each Affiliate and sublicensee, as well as on a 
country-by-country basis, and shall state the rates of exchange used to 
convert the payments due to VERTEX into United States dollars from the 
currency in which such amounts are received by KISSEI.  KISSEI will keep 
complete, true and accurate books of account and records for the purpose of 
showing the derivation of all amounts payable to VERTEX under this Agreement. 
 Such books and records will be kept at KISSEI's principal place of business 
for at least three (3) years following the end of the calendar quarter to 
which they pertain, and will be open at all reasonable times for inspection 
by representatives of VERTEX for the purpose of verifying KISSEI's sales 
reports, or KISSEI's compliance in other respects with this Agreement.  Such 
inspections shall be at the expense of VERTEX, unless a variation or error 
exceeding [ * ], or the equivalent, is discovered in the course of any such 
inspection, whereupon the costs relating thereto shall be for the account of 
KISSEI.  KISSEI will promptly pay to VERTEX the full amount of any 
underpayment, together with interest thereon at the rate of  [ * ]  per 
annum, compounded monthly from the date payment was due.

    5.3. Exchange of Information.  VERTEX and KISSEI will freely share 
technical information in the Field, including VERTEX Technical Information 
and KISSEI Technical Information, which is not subject to restrictions 
imposed by a third party on disclosure to or use by the other party.  KISSEI 
will enable VERTEX to review the ongoing development being conducted under 
the Development Program and to discuss that information with KISSEI's 
officers, all at such reasonable times and as often as may be reasonably 
requested.  VERTEX and KISSEI will seek to form a committee or other such 
body, when appropriate, to coordinate development activities between KISSEI, 
VERTEX and any of their respective licensees or  

                    Option and Rights Agreement -- Page 9

<PAGE>

sublicensees.  Any representatives of VERTEX or KISSEI receiving information 
from representatives of the other party shall sign appropriate agreements 
ensuring that information disclosed to them is held in confidence.

    5.4. Payment Delay.  In case of a delay in any payments due from KISSEI 
to VERTEX hereunder not occasioned by force majeure, interest at the rate of 
one percent (1%) per month, assessed from the thirty-first day after the due 
date of the said payment, shall be due by KISSEI without any special notice.


                                           

                                      Article VI
                                           
                                   Confidentiality
                                           
    6.1. Undertaking.  During the term of this Agreement, each party shall 
keep confidential, and other than as provided herein shall not use or 
disclose, directly or indirectly, any trade secrets, confidential or 
proprietary information, or any other knowledge, information, documents or 
materials, owned, developed or possessed by the other party, whether in 
tangible or intangible form, the confidentiality of which such other party 
takes reasonable measures to protect, including but not limited to VERTEX 
Technical Information and KISSEI Technical Information.  Each party shall 
take any and all lawful measures to prevent the unauthorized use and 
disclosure of such information, and to prevent unauthorized persons or 
entities from obtaining or using such information.  Each party further agrees 
to refrain from directly or indirectly taking any action which would 
constitute or facilitate the unauthorized use or disclosure of such 
information.  Each party may disclose such information to its officers, 
employees and agents, and to sublicensees under the right pursuant to Section 
2.1 and 2.2 hereof and to subcontractors in connection with its development 
or manufacturing of Promising Compounds to the extent necessary to enable 
such parties to perform their obligations hereunder or under the applicable 
sublicense or subcontract, as the case may be; provided that such officers, 
employees, agents, sublicensees and subcontractors have entered into 
appropriate confidentiality agreements for secrecy and non-use of such 
information which by their terms shall be enforceable by injunctive relief at 
the instance of the disclosing party.  Each party shall be liable for any 
unauthorized use and disclosure of such information by its officers, 
employees, agents, sublicensees and subcontractors.

    6.2. Exceptions.  Notwithstanding the foregoing, the provisions of 
section 6.1 hereof shall not apply to knowledge, information, documents or 
materials which the receiving party can conclusively establish:  (i) have 
entered the public domain without such party's breach of any obligation owed 
to the disclosing party; (ii) have become known to the receiving party prior 
to the disclosing party's disclosure of such information to such receiving 
party; (iii) are permitted to be disclosed by the prior written consent of 
the disclosing party; (iv) have become known to the receiving party from a 
source other than the disclosing party other than by breach of an obligation 
of confidentiality owed to the disclosing party; (v) are disclosed by the 
disclosing party to a third party without restrictions on its disclosure; 
(vi) are independently developed by the receiving party without breach of 
this Agreement; or (vii) are required to be disclosed by the receiving party 
to comply with applicable laws, to defend or prosecute litigation or to 
comply  

                    Option and Rights Agreement -- Page 10

<PAGE>

with governmental regulations, provided that the receiving party provides 
prior written notice of such disclosure to the other party and takes 
reasonable and lawful actions to avoid or minimize the degree of such 
disclosure.

    6.3. Survival.  The provisions of this Article VI shall survive the 
termination of this Agreement.


                                           
                                     Article VII
                                           
                                       Patents


                                           
    7.1. Preparation.  VERTEX shall take responsibility for the preparation, 
filing, prosecution and maintenance of any and all patent applications and 
patents in the Territory included in Promising Patents; and shall furnish to 
KISSEI copies of documents relevant to any such preparation, filing, 
prosecution or maintenance.  VERTEX and KISSEI shall otherwise cooperate 
fully in the preparation, filing, prosecution and maintenance of all 
Promising Patents, executing all papers and instruments so as to enable 
VERTEX to apply for, to prosecute and to maintain patent applications and 
patents in VERTEX's name in any country in the Territory.  Each party shall 
provide to the other prompt notice as to all matters which may affect the 
preparation, filing, prosecution or maintenance of any such patent 
applications or patents.

    7.2. Cost Reimbursement.  KISSEI shall reimburse VERTEX for [ * ] the 
reasonable expenses which VERTEX has incurred, or may in the future incur, 
for the preparation, filing, prosecution and maintenance of Promising Patents 
in the Semi-Exclusive Territory; and  [ * ]  the reasonable expenses which 
VERTEX has incurred, or may in the future incur, for the preparation, filing, 
prosecution and maintenance of Promising Patents in the Exclusive Territory.

    7.3. Failure to Reimburse.  If KISSEI shall fail to reimburse VERTEX as 
required under Section 7.2 above with respect to a patent application or 
patent included within the Promising Patents within sixty (60) days after 
receipt of a written request for payment from VERTEX, VERTEX may terminate 
KISSEI's rights hereunder and under the Research and Development Agreement 
with respect to that patent or patent application upon thirty (30) days 
written notice thereof to KISSEI, unless KISSEI during such 30-day period 
shall have submitted payment pursuant to the aforementioned request for 
payment.

                                           
                                     Article VIII
                                           
                                     Infringement
                                           
    KISSEI shall notify VERTEX promptly of any possible infringements,
unauthorized possession, knowledge or use of the intellectual property embodied
in any of the Promising Patents by third parties in any country in the
Territory, of which KISSEI becomes aware.  KISSEI shall promptly furnish VERTEX
with full details of such infringements, unauthorized possession, knowledge or
use, and shall assist in preventing any recurrence thereof.  VERTEX  

                    Option and Rights Agreement -- Page 11

<PAGE>

shall be initially responsible, at its expense, for bringing any action on 
account of any such infringements, unauthorized possessions, knowledge or 
use, and KISSEI shall cooperate with VERTEX, as VERTEX may request, in 
connection with any such action.  If, within sixty (60) days after receipt by 
VERTEX of a written request from KISSEI that it bring such action VERTEX does 
not do so, KISSEI shall have the right, at its expense and in its own name or 
in the name of VERTEX, to do so on behalf of VERTEX, and VERTEX shall 
cooperate with KISSEI, as KISSEI may reasonably request, in connection with 
such action.  Such suit may not be settled by KISSEI without VERTEX's 
consent, which shall not be unreasonably withheld.  Damages recovered in any 
actions referenced hereunder shall be divided [ * ].  If such expenses 
incurred by KISSEI exceed any damages recovered in any actions, [ * ] may be 
deducted from amounts thereafter payable to VERTEX under Article III and 
Article V hereof in respect of Net Sales in such country, provided that total 
amounts otherwise due to VERTEX under those Sections in any year shall not be 
reduced by more than [ * ].


                                      Article IX

                                  Dispute Resolution
                                           
    9.1. Governing Law; Jurisdiction.  This Agreement shall be governed and 
construed in accordance with the internal laws of the Commonwealth of 
Massachusetts.  Both parties hereto agree to submit to personal jurisdiction 
in the Commonwealth of Massachusetts and to accept and agree to venue in that 
State.

    9.2. Arbitration.  In the event of any controversy or claim arising out 
of or relating to any provision of this Agreement or the breach thereof, the 
parties shall try to settle their differences amicably between themselves.  
Any such controversy or claim which the parties are unable to resolve shall, 
upon the written request of one party delivered to the other party, be 
submitted to and be settled by arbitration in Boston, Massachusetts, in 
accordance with the rules of the American Arbitration Association (the "AAA") 
then in effect (except as hereinafter stated), and judgment upon the award 
rendered by the arbitrators may be entered in any court having jurisdiction 
thereof.  Notwithstanding anything to the contrary which may be contained in 
the rules of the AAA, the parties further agree as follows:
                                           
(i) Each party will appoint one person approved by the AAA to hear and
    determine the dispute within fifteen (l5) days after receipt of notice of
    arbitration from the noticing party.  The two persons so chosen will select
    a third impartial arbitrator, and their majority decision will be final and
    conclusive upon the parties hereon.  If either party fails to designate its
    arbitrator within fifteen (l5) days after delivery of the notice provided
    for herein, then the arbitrator designated by the one party will act as
    sole arbitrator, and will be deemed to be the single, mutually approved
    arbitrator to resolve the controversy.  In the event the parties are unable
    to agree upon a rate of compensation for the arbitrators, they will be
    compensated for their services at a rate to be determined by the AAA.
 

                    Option and Rights Agreement -- Page 12

<PAGE>

(ii)     The parties shall enjoy, but are not limited to, the same rights to
         discovery as they would enjoy under the Federal Rules of Civil 
         Procedure for the district in which the City of Boston is located.
                                       
(iii)    Each party will bear its own costs, including attorneys' fees, in the
         arbitration, and will share equally the cost of the arbitrators.
                                       
(iv)     The arbitrators will, upon the request of either party, issue a written
         opinion of their findings of fact and conclusions of law and shall 
         deliver a copy of such opinion to both parties.
                                       
(v)      Upon receipt of said written opinion, either party will have the right,
         within fifteen (l5) days thereof, to file with the arbitrators a motion
         to reconsider, and the arbitrators thereupon will reconsider the issues
         raised by said motion and either confirm or alter their decision, which
         will then be final and conclusive upon both parties hereto.  The costs 
         of such a motion for reconsideration and written opinion of the 
         arbitrators, including attorneys' fees, will be paid by the 
         non-prevailing party.  Any motion to reconsider shall be sent to the 
         other party at the time it is filed with the arbitrators.
         
                                   
                                      Article X
                                           
                                 Term and Termination
                                           
    10.1.     Term.  The term of this Agreement shall extend until the later 
of the last to expire of the Promising Patents or ten (10) years from the 
date of first commercial sale of the Promising Compound in the Territory.

    10.2.     Termination.  In addition to rights of termination which may be 
granted to either party under other provisions of this Agreement, either 
party may terminate this Agreement upon sixty (60) days prior written notice 
to the other party upon the material breach by such other party of any of its 
obligations under this Agreement, provided that such termination shall become 
effective only if the breaching party shall fail to remedy or cure the breach 
within such sixty (60) day period.

    10.3.     Effect of Termination.  Termination of this Agreement for any 
reason, or expiration of this Agreement, will not affect: (i) obligations, 
including the payment of any royalties, which have accrued as of the date of 
termination or expiration, and (ii) rights and obligations which, from the 
context thereof, are intended to survive termination or expiration of this 
Agreement.

                    Option and Rights Agreement -- Page 13

<PAGE>

                                      Article XI
                                           
                               Miscellaneous Provisions
                                           
    11.1.     No Warranty.  VERTEX makes no warranty of any kind whatsoever, 
either express or implied, to KISSEI, or any customer of KISSEI, as to the 
ability of KISSEI to understand and utilize the Promising Patents or VERTEX 
Technical Information.  KISSEI shall indemnify and shall hold VERTEX harmless 
against and from any and all claims of third parties for damages due to 
personal injury arising out of the actions of KISSEI, its Affiliates, agents, 
employees, sublicensees or subcontractors, including but not limited to 
claims arising in connection with the development, manufacturing, assembly, 
or sale of Promising Compounds by KISSEI.  Notwithstanding the foregoing, 
should VERTEX manufacture Promising Compounds for KISSEI, it will warrant 
that such manufacture will be accomplished strictly in accordance with 
KISSEI's manufacturing specifications and will indemnify KISSEI against any 
damages caused by VERTEX's failure to meet such specifications.  In addition, 
VERTEX will promptly notify KISSEI should VERTEX become aware of any 
unexpected adverse reactions to any Promising Compounds administered to 
humans or animals.

    11.2.     Third Party Actions.  To VERTEX's knowledge, the exercise of 
the rights by KISSEI hereunder will not result in the infringement of valid 
patents of third parties.  Nevertheless, each party will promptly notify the 
other in the event any relevant third party patents come to its notice.  
VERTEX gives no warranty regarding the infringement of third party rights by 
practice of the Promising Patents, and gives no indemnity against costs, 
damages, expenses or other losses arising out of proceedings brought against 
KISSEI or any other person by any third party.  In the event KISSEI is sued 
for infringement of any rights of any third party in the course of its 
development, manufacture, marketing and sale of Promising Compounds or its 
use of Promising Patents in connection therewith, VERTEX shall extend to 
KISSEI, at no charge, good faith assistance and support in defending such 
action, and may participate in the conduct of the suit at its own expense, 
but shall otherwise be under no obligation in respect thereof.  Legal 
expenses and fees arising from such a legal action shall be paid by KISSEI.

    11.3.     Waiver.  Any waiver by either party of the breach of any term 
or condition of this Agreement will not be considered as a waiver of any 
subsequent breach of the same or any other term or condition hereof.

    11.4.     Force Majeure.  Neither party will be in breach hereof by 
reason of its delay in the performance of or failure to perform any of its 
obligations hereunder, if that delay or failure is caused by strikes, acts of 
God or the public enemy, riots, incendiaries, interference by civil or 
military authorities, compliance with governmental priorities for materials, 
or any fault beyond its control or without its fault or negligence.

    11.5.     Severability.  In the event that any provision of this 
Agreement, or any part hereof, is found invalid or unenforceable, the 
remainder of this Agreement will be binding on the parties hereto, and will 
be construed as if the invalid or unenforceable provision or part thereof had 
been deleted from this Agreement. 

                    Option and Rights Agreement -- Page 14

<PAGE>

    11.6.     Government Acts.  In the event that any act, regulation, 
directive, or law of a government within the Territory, including its 
departments, agencies or courts, should make impossible or prohibit, 
restrain, modify or limit any material act or obligation of KISSEI or VERTEX 
under this Agreement, the party, if any, not so affected, shall have the 
right, at its option, to suspend or terminate this Agreement as to such 
country.

    11.7.     Government Approvals.  KISSEI and its sublicensees will obtain 
any government approval required in the Territory to enable this Agreement to 
become effective, or to enable any payment hereunder to be made, or any other 
obligation hereunder to be observed or performed.  Each party will keep the 
other informed of progress in obtaining any such approvals.

    11.8.     Export Controls.  This Agreement is made subject to any 
restrictions concerning the export of Promising Compounds or VERTEX Technical 
Information from the United States which may be imposed upon or related to 
either party to this Agreement from time to time by the Government of the 
United States.  Furthermore, KISSEI will not export, directly or indirectly, 
any VERTEX Technical Information or any Promising Compounds utilizing such 
Technical Information to any countries for which the United States Government 
or any agency thereof at the time of export requires an export license or 
other governmental approval, without first obtaining the written consent to 
do so from the Department of Commerce or other agency of the United States 
Government when required by applicable statute or regulation.

    11.9.     Assignment.  KISSEI will not have the right to assign this 
Agreement without the prior written consent of VERTEX, except to one of 
KISSEI's Affiliates.  VERTEX is free to assign this Agreement to any of its 
Affiliates, and, with KISSEI's written consent, which shall not be 
unreasonably withheld, to any entity which shall assume any and all of 
VERTEX's obligations hereunder.

    11.10.    Counterparts.  This Agreement may be executed in duplicate both 
of which shall be deemed to be originals, and both of which shall constitute 
one and the same Agreement.

    11.11.    No Agency.  Notwithstanding any of the provisions of this 
Agreement, KISSEI at no time will enter into, incur, or hold itself out to 
third parties as having authority to enter into or incur, on behalf of 
VERTEX, any commitment, expense, or liability whatsoever, and all contracts, 
expenses and liabilities in connection with or relating to the development, 
manufacture or sale of the Promising Compounds shall be made, paid, and 
undertaken exclusively by KISSEI, and not as an agent or representative of 
VERTEX.

    11.12.    Competition.  During the term of this Agreement, KISSEI, 
including its Affiliates, will not develop, manufacture, sell, or cause to be 
developed, manufactured or sold anywhere in the Territory, products for the 
treatment of chronic inflammation or neurodegeneration which act in whole or 
in part through inhibition of a MAP kinase enzyme, without the specific prior 
written approval of VERTEX.  If this Agreement is terminated for breach by or 
nonfeasance of KISSEI, neither KISSEI or its Affiliates will develop, 
manufacture or sell such products for [ * ].

    11.13.    Notice.  All communications between the parties with respect to 
any of the provisions of this Agreement will be sent to the addresses set out 
below, or to other addresses as  

                    Option and Rights Agreement -- Page 15

<PAGE>

notified by the parties for the purpose of this clause, by prepaid, 
registered or certified air mail which shall be deemed received by the other 
party on the seventh business day following deposit in the mails, or by 
cable, telex, facsimile transmission, or other electronic means of 
communication (which shall be deemed received when transmitted), with 
confirmation by letter given by the close of business on the next following 
business day:
                                           
              if to KISSEI, at:
                                            
                   19-48 Yoshino Matsumoto-City
                   Nagano Pref. 399 Japan

                   Attention:  Yukiyoshi Ajisawa
                   Board Director, 
                   Discovery Research, R&D

                   Attention:  Director of Legal Department

              if to VERTEX, at:

                   130 Waverly Street
                   Cambridge, Massachusetts 02139-4242
                   Attention:  Richard H. Aldrich
                   Senior Vice President and Chief Business Officer

    11.14.    Headings.  The paragraph headings are for convenience only and 
will not be deemed to affect in any way the language of the provisions to 
which they refer.

    11.15.    Authority.  The undersigned represent that they are authorized 
to sign this Agreement on behalf of the parties hereto.  The parties each 
represent that no provision of this Agreement will violate any other 
agreement that a party may have with any other person or company.  Each party 
has relied on that representation in entering into this Agreement. 

                    Option and Rights Agreement -- Page 16

<PAGE>

    This Agreement contains the entire understanding of the parties relating 
to the matters referred to herein, and may only be amended by a written 
document, duly executed on behalf of the respective parties.

                             VERTEX PHARMACEUTICALS INCORPORATED



                             By:  
                                ----------------------------------
    
                             Title:                                            
                                   -------------------------------
    
                             Date of Signature:                                
                                               -------------------


                             
                             KISSEI PHARMACEUTICAL CO., LTD.


                             By:  
                                ----------------------------------
    
                             Title:                                          
                                   -------------------------------
    
                             Date of Signature:                         
                                               -------------------

                    Option and Rights Agreement -- Page 17

<PAGE>

 
                                      SCHEDULE I
                                           
                      Promising Compounds, Processes and Patents

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

                    Option and Rights Agreement -- Confidential



<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S THIRD QUARTER 10-Q FOR THE PERIOD ENDING SEPTEMBER 30, 1997.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> US DOLLARS
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<EXCHANGE-RATE>                                    1.0
<CASH>                                         177,191
<SECURITIES>                                   106,092
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               285,466
<PP&E>                                          32,784
<DEPRECIATION>                                  22,602
<TOTAL-ASSETS>                                 298,727
<CURRENT-LIABILITIES>                           11,758
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           251
<OTHER-SE>                                     281,230
<TOTAL-LIABILITY-AND-EQUITY>                   298,727
<SALES>                                              0
<TOTAL-REVENUES>                                32,620
<CGS>                                                0
<TOTAL-COSTS>                                   45,215
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 438
<INCOME-PRETAX>                               (13,033)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (13,033)
<EPS-PRIMARY>                                   (0.54)
<EPS-DILUTED>                                   (0.54)
        

</TABLE>

<PAGE>


                                                                      Exhibit 99

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

    Re: Vertex Pharmaceuticals Incorporated
    Registration on Form S-8

We are aware that our report dated October 21, 1997 on our review of interim 
financial information of Vertex Pharmaceuticals Incorporated for the three 
month and nine month periods ended September 30, 1997 and included in the 
Company's quarterly report on Form 10-Q for the quarter then ended is 
incorporated by reference in the Company's registration statements on Form 
S-8 (File Nos. 33-48030, 33-48348, 33-65742, 33-93224, 333-12325 and 
333-27011).  Pursuant to Rule 436(c) under the Securities Act of 1933, this 
report should not be considered a part of the registration statement prepared 
or certified by us within the meaning of Sections 7 and 11 of that Act.

                                       /s/ Coopers & Lybrand L.L.P.


Boston, Massachusetts
November 12, 1997



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