VION PHARMACEUTICALS INC
10QSB, 1997-08-14
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-QSB

(Mark One)
[x]     QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 1997

[ ]     TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE EXCHANGE
        ACT
For the transition period from ____________ to ____________

Commission file number         0-26534
                      ---------------------------




                           VION PHARMACEUTICALS, INC.
- --------------------------------------------------------------------------------
        (Exact Name of Small Business Issuer as Specified in Its Charter)



          Delaware                                                13-3671221
- -------------------------------                              -------------------
(State or Other Jurisdiction of                               (I.R.S. Employer
Incorporation or Organization)                               Identification No.)

                       4 Science Park, New Haven, CT 06511
- --------------------------------------------------------------------------------
                    (Address of Principal Executive Offices)


                                 (203) 498-4210
- --------------------------------------------------------------------------------
                (Issuer's Telephone Number, Including Area Code)


- --------------------------------------------------------------------------------
   (Former Name, Former Address and Former Fiscal Year, if Changed Since Last
                                    Report)

        Check whether the issuer:  (1) filed all reports required to be filed by
Section 13 or 15(d) of the  Exchange  Act during the past 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 _______


        The number of shares  outstanding  of the issuer's  sole class of common
equity,  as of July 31,  1997 is:  8,639,226  shares of common  stock,  $.01 par
value.


        Transitional Small Business Disclosure Format (check one):

Yes _______       No  ___X___









Part 1 - Financial Information
Item 1. Financial Statements

Consolidated Balance Sheet

Vion Pharmaceuticals, Inc.
(A Development Stage Company)

<TABLE>
<CAPTION>


                                                                                    --------------------    --------------------
                                                                                          June 30,
                                                                                            1997                 December 31,
                                                                                         (Unaudited)                 1996
- --------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                <C>                     <C> 
ASSETS
Current Assets:
     Cash and cash equivalents                                                      $         4,352,877     $         3,788,369
     Short-term investments                                                                     329,200               4,628,446
     Other current assets                                                                        90,745                 106,635
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------
        Total current assets                                                                  4,772,822               8,523,450
     Property and equipment, net                                                                933,461                 712,806
     Security deposits                                                                           34,894                  41,301
     Research contract prepayment                                                               416,945                 603,208
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------
        Total assets                                                                $         6,158,122     $         9,880,765
                                                                                    --------------------    --------------------

LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities:
     Obligation under capital lease - current                                                   164,417                  91,476
     Accounts payable and accrued expenses                                                    1,722,154                 494,127
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------
        Total current liabilities                                                             1,886,571                 585,603
     Obligation under capital lease - long term                                                 305,029                 223,190
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------
        Total Liabilities                                                                     2,191,600                 808,793
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------

Shareholders' equity
     Convertible preferred stock, $0.01 par value, authorized: 5,000,000 shares;
        issued and outstanding: 1997- 979,374 shares 1996 - 1,107,028 shares                      9,794                  11,070
     Common stock, $0.01 par value, authorized: 35,000,000 shares;
        issued and outstanding: 1997- 8,489,226 shares 1996 - 8,017,961shares                    84,892                  80,178
     Additional paid-in-capital                                                              26,768,703              26,721,888
     Deferred compensation                                                                      (89,444)               (106,760)
     Accumulated deficit                                                                    (22,807,423)            (17,634,404)
                                                                                    --------------------    --------------------
                                                                                    --------------------    --------------------
                                                                                              3,966,522               9,071,972
                                                                                    --------------------    --------------------
                                                                                    ====================    ====================
Total liabilities and shareholders' equity                                          $         6,158,122     $         9,880,765
                                                                                    ====================    ====================

</TABLE>

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


                                     Page 2








Consolidated Statement of Operations

Vion Pharmaceuticals, Inc.
(A Development Stage Company)




<TABLE>
<CAPTION>
                                                                                                                  For The Period  
                                                                                                                 From May 1, 1994
                                                            Three Months Ended               Six Months Ended  (Inception) through
                                                 June 30,       June 30,          June 30,       June 30,            June 30,
                                             -------------------------------- -----------------------------------------------------
                                                  1997            1996             1997            1996               1997
                                                     (Unaudited)                        (Unaudited)               (Unaudited)
- ----------------------------------------------------------------------------- -----------------------------------------------------
<S>                                           <C>             <C>              <C>             <C>             <C> 
Revenues:
    Contract research grants                  $        8,481   $           -  $      48,221    $         -    $        100,000
                                             -------------------------------- -----------------------------------------------------
Operating expenses:
    Research and development                       2,872,857       1,423,736        4,394,636       3,045,947       13,502,925
    General and administrative                       491,058         458,408          982,592         886,139        5,180,988

    Purchased research and development                   -               -                -               -          4,481,405
    Amortization of finance charges                      -               -                -               -            345,439

Interest Income                                      (78,795)        (94,505)        (178,029)       (142,195)        (700,066)
Interest Expense                                      10,744           2,457           21,802           4,885           77,249
                                             -------------------------------- -----------------------------------------------------
    Net Loss                                  $   (3,287,383)  $  (1,790,096) $    (5,172,780) $   (3,794,776) $   (22,787,940)
                                             -------------------------------- -----------------------------------------------------

Net loss per share                            $        (0.38)  $       (0.23) $         (0.60) $        (0.48)
                                             -------------------------------- -----------------------------------------------------

Weighted average common stock and
    common stock equivalents outstanding           8,758,708       7,844,796        8,629,302       7,833,594
                                             -------------------------------- -----------------------------------------------------
</TABLE>



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


                                     Page 3







CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY

Vion Pharmaceuticals, Inc.
( A Development Stage Company)

<TABLE>
<CAPTION>
                                               Convertible                                                                  
                                             Preferred Stock      Common Stock                                 
                                              ------------------------------------- Additional       Deferred  
                                              Shares   Amount   Shares    Amount  Paid-in Capital  Compensation
                                           --------------------------------------------------------------------

<S>                                          <C>    <C>     <C>        <C>          <C>          <C>           
Common stock issued for cash - 
      July 1994                                   0      $0   2,693,244  $26,932              $0           $0  
Common stock issued for services -
      August 1994                                               159,304    1,593                               
Net loss                                                                                                       
                                           --------------------------------------------------------------------
Balance - December 31, 1994                       0       0   2,852,548   28,525               0            0  

Stock options issued for 
      compensation -  February 1995                                                      540,000               

Reverse acquisition of MelaRx
     Pharmaceuticals, Inc. - 
     April 1995                                               2,000,000   20,000       4,300,000               

Shares repurchased pursuant to
     employment agreements -
     April 1995                                                (274,859)  (2,749)                              

Private placement of common stock -
      April 1995                                                 76,349      763         205,237               

Warrants issued with bridge notes -
      April 1995                                                                         200,000               

Initial public  offering of units of 
     one common  share,  
     one Class A warrant and
     one Class B warrant at
     $4.00 per unit - August 1995 
     and  September 1995                                      2,875,000   28,750       9,667,460               

Issuance of common stock                                          1,250       13             488               

Receipts from sale of unit purchase 
     option                                                                                  250               

Net loss                                                                                                       


                                           --------------------------------------------------------------------
Balance at December 31, 1995                     0       0    7,530,288   75,302      14,913,435            0  

Issuance of Class A convertible 
 preferred stock                         1,250,000  12,500                            11,518,552               

Conversion of Class A convertible 
 preferred stock                          (164,970) (1,650)     458,255    4,582          (2,932)              

Issuance of common stock                                         29,418      294         102,426               

Class A convertible preferred 
 stock dividend                             21,998     220                                                     

Compensation associated with stock
 option grants                                                                           190,407     (190,407) 

Amortization of deferred compensation                                                                  83,647  

Net loss                                                                                                       
                                           --------------------------------------------------------------------
Balance at December 31, 1996             1,107,028  $11,070   8,017,961  $80,178     $26,721,888    ($106,760)
                                           --------------------------------------------------------------------
Conversion of Class A convertible 
 preferred stock                          (151,567)  (1,515)    421,027    4,211          (2,696)              

Compensation associated with stock 
 options grants                                                                           30,017               

Exercise of warrants                                                238        3              (6)              

Exercise of stock options                                        50,000      500          19,500               

Class A convertible preferred 
 stock dividend                             23,913      239                                                    

Amortization of deferred compensation                                                                  17,316  

Net loss                                                                                                       

                                           --------------------------------------------------------------------
Balance at June 30, 1997  (Unaudited)      979,374   $9,794   8,489,226  $84,892     $26,768,703     ($89,444)
                                           --------------------------------------------------------------------




                                                              Total      
                                              Accumulated  Stockholders'                          
                                                Deficit      Equity      
                                             -------------------------   
                                                                         
Common stock issued for cash -                                           
      July 1994                                 ($19,877)      $7,055    
Common stock issued for services -                                       
      August 1994                                 (1,176)         417    
Net loss                                        (475,946)    (475,946)   
                                             -------------------------   
Balance - December 31, 1994                     (496,999)    (468,474)   
                                                                         
Stock options issued for                                                 
      compensation -  February 1995                           540,000    
                                                                         
Reverse acquisition of MelaRx                                            
     Pharmaceuticals, Inc. -                                             
     April 1995                                             4,320,000    
                                                                         
Shares repurchased pursuant to                                           
     employment agreements -                                             
     April 1995                                    2,029         (720)   
                                                                         
Private placement of common stock -                                      
      April 1995                                              206,000    
                                                                         
Warrants issued with bridge notes -                                      
      April 1995                                              200,000    
                                                                         
Initial public  offering of units of                                     
     one common  share,                                                  
     one Class A warrant and                                             
     one Class B warrant at                                              
     $4.00 per unit - August 1995                                        
     and  September 1995                                    9,696,210    
                                                                         
Issuance of common stock                                          501    
                                                                         
Receipts from sale of unit purchase                                      
     option                                                       250    
                                                                         
Net loss                                      (9,530,535)  (9,530,535)   
                                                                         
                                                                         
                                             -------------------------   
Balance at December 31, 1995                 (10,025,505)   4,963,232    
                                                                         
Issuance of Class A convertible                                          
 preferred stock                                           11,531,052    
                                                                         
Conversion of Class A convertible                                        
 preferred stock                                                    0    
                                                                         
Issuance of common stock                                      102,720    
                                                                         
Class A convertible preferred                                            
 stock dividend                                     (220)           0    
                                                                         
Compensation associated with stock                                       
 option grants                                                      0    
                                                                         
Amortization of deferred compensation                          83,647    
                                                                         
Net loss                                      (7,608,679)  (7,608,679)   
                                             -------------------------   
Balance at December 31, 1996                ($17,634,404)  $9,071,972    
                                             -------------------------   
Conversion of Class A convertible                                        
 preferred stock                                                    0    
                                                                         
Compensation associated with stock                                       
 options grants                                                30,017    
                                                                         
Exercise of warrants                                               (3)   
                                                                         
Exercise of stock options                                      20,000    
                                                                         
Class A convertible preferred                                            
 stock dividend                                     (239)           0    
                                                                         
Amortization of deferred compensation                          17,316    
                                                                         
Net loss                                      (5,172,780)  (5,172,780)   
                                                                         
                                             -------------------------   
Balance at June 30, 1997  (Unaudited)       ($22,807,423)  $3,966,522    
                                             -------------------------   
</TABLE>                                                                 
                                                                         
   The accompanying notes are an integral part of these financial statements.
                                                                         
                                                                         
                                                                         
                                     Page 4





CONSOLIDATED STATEMENT OF CASH FLOWS

Vion Pharmaceuticals, Inc.
(A Development Stage Company)

<TABLE>
<CAPTION>


                                                                                                      For the period
                                                                                                      from May 1, 1994
                                                                           For the Six Months         (inception) through
                                                                              Ended June 30,          June 30,
                                                           -------------------------------------------------------------------
                                                                           1997             1996            1997
                                                                                 (Unaudited)            (Unaudited)
- -------------------------------------------------------------------------------------------------------------------------------
<S>                                                                 <C>              <C>               <C>
Cash Flows from operating activities:
     Net loss                                                          $ (5,172,780)  $  (3,794,776)  $ (22,787,940)
     Adjustments to reconcile net loss to
     cash flows used in operating activities
          Purchased research and development                                   --              --         4,481,405
          Amortization of financing costs                                      --              --           345,439
          Depreciation and amortization                                     132,297          45,991         283,757
         (Increase) in other current assets                                  15,890          16,675         (89,759)
         (Increase) in other assets                                         192,670          11,134        (450,124)
          Increase in accounts payable and
          accrued expense                                                 1,228,027         259,345       1,687,622
          Stock issued for services                                            --              --               417
          Stock options issued for compensation                              47,333            --           670,980
                                                                             ------       ---------         -------
                 Net cash (used in) operating activities                 (3,556,563)     (3,461,631)    (15,858,203)
                                                                         ----------      ----------     ----------- 

Cash flows used for investing activities:
          Purchase of marketable securities                              (1,139,610)     (5,913,259)    (15,227,056)
          Maturities of marketable securities                             5,438,856            --        14,897,856
          Cash portion of MelaRx acquisition                                   --              --             4,061
          Acquisition of fixed assets                                      (119,747)       (188,911)       (633,069)
                                                                           --------        --------        -------- 
                 Net cash provided by (used in) investing activities      4,179,499      (6,102,170)       (958,208)
                                                                          ---------      ----------        -------- 

Cash flows provided by financing activities:
          Initial public offering                                              --              --         9,696,210
          Net proceeds from issuance of common stock                         20,000             520         336,276
          Net proceeds from issuance of preferred stock                        --        11,590,662      11,531,052
          Repurchase of common stock                                           --              --              (720)
          Net proceeds from bridge financing                                   --              --         1,704,269
          Repayments of bridge financing                                       --              --        (2,000,000)
          Advances from stockholders                                           --              --           250,000
          Repayments to stockholders                                           --              --          (250,000)
          Exercise of warrants                                                   (3)           --                (3)
          Receipts from sale of unit purchase option                           --              --               250
          Repayment of equipment capital lease                              (78,425)         (7,428)        (98,046)
                                                                            -------          ------         ------- 
                 Net cash provided by (used in) financing activities        (58,428)     11,583,754      21,169,288
                                                                            -------      ----------      ----------

Net increase in cash                                                        564,508       2,019,953       4,352,877
Cash and cash equivalents at beginning of period                          3,788,369       2,350,933            --
                                                                          ---------       ---------       ---------       
Cash and cash equivalents at end of period                            $   4,352,877    $  4,370,886       4,352,877
                                                                      =============    ============       =========

</TABLE>


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



                                     Page 5





VION PHARMACEUTICALS, INC
(A Development Stage Company)

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


(Note A) - The Company:

        Vion  Pharmaceuticals,  Inc.,  formerly OncoRx,  Inc., (the Company) was
incorporated in May 1993 and began  operations on May 1, 1994. The Company is in
the development stage and is principally devoted to the research and development
of  therapeutic  products  for  the  treatment  of  cancer  and  cancer  related
disorders.

        On April 20, 1995,  the Company  merged into OncoRx  Research  Corp.,  a
wholly-owned  subsidiary  of MelaRx  Pharmaceuticals  Inc.  (MelaRx),  which was
renamed  OncoRx,  Inc. after the merger (the Merger).  The  stockholders  of the
Company were issued  2,654,038  common and 23,859  preferred shares of MelaRx in
exchange for 2,000,000 shares of common stock of the Company valued at $2.16 per
share (fair  value).  In August 1995,  the Company  completed an initial  public
offering  (IPO)  resulting  in net  proceeds  to the  Company  of  approximately
$9,696,000.  In April 1996 the Company changed its name to Vion Pharmaceuticals,
Inc.

        As the shareholders of the Company  obtained a majority  interest in the
merged company for accounting purposes,  the Company is treated as the acquirer.
Therefore,  the Merger is  recorded  as a  purchase  in the  Companys  financial
statements which include the results of operations of the Company from inception
and MelaRx from the date of acquisition.  The excess of cost over the fair value
of MelaRxs net tangible assets,  $4,481,405,  was treated as purchased  research
and development and expensed immediately.

(Note B) - Basis of Presentation:

        The accompanying  unaudited  financial  statements have been prepared in
accordance with generally accepted  accounting  principles for interim financial
information and with the instructions to Form 10-QSB.  Accordingly,  they do not
include all of the  information  and  footnotes  required by generally  accepted
accounting  principles  for  complete  financial  statements.  In the opinion of
management, all adjustments (consisting of normal recurring accruals) considered
necessary for a fair presentation have been included.  Operating results for the
three  month and six  month  periods  ended  June 30,  1997 are not  necessarily
indicative of the results that may be expected for the year ending  December 31,
1997. For further  information,  refer to the financial statements and footnotes
thereto  included  in the  Company's  Annual  Report for the  fiscal  year ended
December 31, 1996 on Form 10-KSB (File No. 0- 26534).



                                     Page 6


(Note C) - Stock Option Plan:

                Through  December 31, 1996,  options to purchase an aggregate of
896,750  shares had been granted  under the Companys  Amended and Restated  1993
Stock  Option  Plan (the  Plan).  On January 29,  1997,  the Board of  Directors
adopted,  subject to stockholder  approval,  an amendment to the Plan increasing
the  number of  shares  which may be  issued  under the Plan from  1,000,000  to
1,500,000.  The  amendment to the Plan was approved by the  stockholders  at the
Companys annual meeting on April 16, 1997.


(Note D) - Private Placement of Class A Convertible Preferred Stock:

        On May 22, 1996, the Company  completed a private placement of 1,250,000
shares of Class A convertible preferred stock, at $10.00 per share, resulting in
net  proceeds  to the  Company of  $11,531,052.  Each share of Class A preferred
stock is initially  convertible  into  2.777777  shares of the  Companys  common
stock. The shares of Class A preferred stock pay semi-annual dividends of 5% per
annum,  payable in additional  shares of Class A preferred  stock, and a 15% one
time  dividend if the Company  redeems the issue within 3 years.  The issue also
contains  a  provision  for a  special  dividend  after  2 years  under  certain
conditions if the Companys  common stock price falls below the conversion  price
of the Class A preferred  stock.  The issuance of the Class A preferred stock at
closing also triggered certain adjustment provisions of the Companys outstanding
warrants, resulting in the issuance of additional warrants.

(Note E) - Antidilution Adjustment:

        As a result of the sale on May 22, 1996 of  1,250,000  shares of Class A
convertible  preferred stock, and pursuant the Warrant  Agreement  governing the
rights of the Class A Warrants and the Class B Warrants,  an adjustment was made
to the exercise price of the Class A Warrants and the Class B Warrants and there
was a  corresponding  distribution  of  additional  Class A Warrants and Class B
Warrants.  Specifically,  on July 12, 1996 (the "Payment Date") each holder of a
Class A Warrant at the close of business on July 3, 1996 (the "Record Date") was
issued an additional  0.1 Class A Warrants and the exercise price of the Class A
Warrants was reduced from $5.20 to $4.73. In addition,  on the Payment Date each
holder of a Class B Warrant  on the close of  business  on the  Record  Date was
issued an additional  0.1 Class B Warrants and the exercise price of the Class B
Warrants was reduced from $7.00 to $6.37.

(Note F)  Continuation of Research and Licensing Agreement:

The Company has agreed to an extension of a research  agreement with The Regents
of the University of California on behalf of the Berkeley Campus (Berkeley). The
extension continues from March 1, 1997 through July 15, 1997 at a total level of
funding of $97,000.

Pursuant  to an  agreement  with  Berkeley  providing  for an  option  to obtain
licenses for certain  inventions  resulting  from the research,  the Company has
entered  into  negotiations  to  license  some  of  these  inventions,   and  is
negotiating to obtain options to license others.


                                     Page 7


(Note G)  Covance Agreement:

During the quarter  ended June 30,  1997,  the Company  entered  into a Clinical
Development  Agreement (the Agreement) with Covance Clinical  Research Unit Ltd.
and Covance Inc. (Covance). Pursuant to the Agreement the Company is contracting
to Covance the selection and management of clinical sites and the preparation of
clinical  trial  reports  arising  from  clinical  trials  performed  by Covance
regarding  the  Companys  product  candidate  Promycin(R) (porfiromycin) for the
inclusion in a regulatory submission.  The Company has accrued for $1,323,442 of
expenses  incurred  under the  Agreement as of June 30, 1997.  During the twelve
months ending December 31, 1997, the Company  estimates it will make payments of
$2,800,000 to Covance under the Agreement.

(Note H) Subsequent Events

Effective July 24,1997,  the Company and Yale University  (Yale) amended certain
licensing  agreements  between  the parties  pursuant  to which,  Yale agreed to
reduce certain amounts payable under such agreements.  As a result,  the Company
issued 150,000 shares of common stock to Yale.

 ITEM 2.  PLAN OF OPERATIONS.

General

        The  Company  is a  development  stage  biopharmaceutical  company.  Its
activities  to  date  have  consisted  primarily  of  research  and  development
sponsored  by  it  pursuant  to  two  separate  license   agreements  with  Yale
University, negotiating and obtaining other collaborative agreements, recruiting
management and other  personnel,  securing its facilities and raising equity and
debt  financing.  The Company has not  generated  any material  revenues and has
incurred substantial operating losses from its activities.

        The Company intends to use a substantial  portion of the net proceeds of
its May, 1996 private  financing to fund its plan of operations,  which includes
the following elements for the next 12 months:

            o  Continue   to   develop   internal   research   and   development
               capabilities and conduct research and development with respect to
               the Company's  core  technologies  and other  product  candidates
               which may be  identified by the Company.  The Company  expects to
               incur  substantial  expenditures  for  research  and  development
               expenses.  In addition,  the Company expects to purchase or lease
               laboratory and office equipment worth approximately  $480,000 and
               enter into a sale and  leaseback  of  approximately  $385,000  of
               laboratory equipment.  During the next twelve months, the Company
               does not plan to hire any additional employees.

            o  Conduct  Phase III  clinical  studies  in the U.S.  and Europe of
               Promycin for treatment of cancer of the head and neck.


                                     Page 8


            o  Continue to support  research and development  being performed at
               Yale  University and by other  collaborators  and seek additional
               collaborative agreements.

            o  Seek to acquire, generally through in-licensing, oncology-related
               products  that can be  marketed  without  significant  additional
               development activities.



        The Company  currently  estimates that the remaining net proceeds of its
private  placement in May,  1996 and its existing cash and  equivalents  will be
sufficient to fund its planned  operations for  approximately the next 4 months.
In the event of delays or  unexpected  problems  in  product  development,  cost
overruns, or other unanticipated  expenses commonly associated with a company in
an early stage of  development,  the Company will require  additional  funds. In
addition,  the Company will need substantial  additional financing,  beyond this
period to fund  further  research  and  development  and the  Company's  working
capital requirements. As of June 30, 1997 the amount required to fund operations
for the next twelve months is estimated at approximately  $15,700,000.  However,
the  Company's cash  requirements  may vary  materially  from those now  planned
because of results of  research  and  development,  results of product  testing,
relationships  with  strategic  partners,  changes in focus and direction of the
Company's research  and  development  programs,  competitive  and  technological
advances,  the  regulatory  process  in the  United  States and abroad and other
factors.

        The Company  received an opinion  from its  auditors for the fiscal year
ended  December  31,  1996,  expressing  substantial  doubt as to its ability to
continue as a going concern.  The Company  intends to address the immediate need
for  additional  capital by raising  funds  through a private  placement  of its
securities, although the Company expects to require additional financing to fund
its longer-term  activities and may require  additional capital for acquisitions
and new development projects.

Liquidity and Capital Resources

        At June 30, 1997,  the Company had working  capital of  $2,886,251.  The
Company's principal sources of funds through June 30, 1997 have been $11,531,052
net  proceeds  from private  financing  through  issuance of  1,250,000  Class A
convertible  preferred stock;  $9,696,210 from its initial public offering,  and
$5,478,280 in net proceeds  from private  placements of common stock in 1992 and
1993 by its predecessor, MelaRx Pharmaceuticals Inc.

        The Company used the proceeds of its initial public  offering to repay a
previous  bridge  financing and used the remaining funds and the proceeds of its
sale of  convertible  preferred  stock to  implement  its business  plan,  which
includes hiring of additional  personnel;  capital expenditures for the purchase
of  equipment,  principally  for  laboratory  facilities;  costs of research and
development;  payment of license fees due under sponsored  research  agreements;
and grants to Yale University to fund certain  research,  including  research in
Dr. Yung-Chi  Cheng's  laboratory.  During the twelve months ending December 31,
1997,  the  Company  will  be  required  to make  payments  of an  aggregate  of


                                     Page 9



$1,205,000 to Yale University and the University of California,  Berkeley, under
sponsored research and license agreements.

        The Company  requires  substantial  new  revenues  and other  sources of
capital  in  order  to meet  such  budgeted  expenditures  and to  continue  its
operations throughout the year. The Company is seeking to enter into one or more
significant  strategic  partnerships  with  pharmaceutical   companies  for  the
development  of  its  core  technologies,  through  which  it  would  anticipate
receiving  some of the  substantial  revenues  and  financing.  The  Company has
entered into discussions with several major pharmaceutical  companies concerning
such a strategic  alliance,  but there can be no assurance that the Company will
be successful in achieving  such an alliance,  nor can the Company  predict what
funds might be available  to it if it can achieve such an alliance.  The Company
is also seeking to raise funds through  additional means,  including (1) private
placements and recapitalization of its securities; (2) spin-off, refinancing, or
partial  sale  or   disposition  of  its  rights  to  certain  of  its  non-core
technologies;  and (3) equipment lease financing. No assurance can be given that
the Company  will be  successful  in  arranging  financing  through any of these
alternatives.

        Failure to obtain  such  financing  will  require  the Company to delay,
renegotiate, or omit payment on its outside research funding commitments causing
it to  substantially  curtail its  operations,  resulting in a material  adverse
effect on the Company.

        In February  1997,  the  Financial  Accounting  Standards  Board  issued
Statement  No.  128,  Earnings  per Share,  which is  required  to be adopted on
December  31,  1997.  At that time,  the Company  will be required to change the
method  currently  used to compute  earnings  per share and to restate all prior
periods.  Under the new requirements for calculating primary earnings per share,
the dilutive  effect of stock options will be excluded.  The impact of Statement
128 on the calculation of basic and dilutive  earnings per share for the quarter
and six month  periods  ended June 30, 1997 and June 30, 1996 is not expected to
be material.



                                    Page 10

                                     PART II

                                OTHER INFORMATION


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

        At the Annual Meeting of  Stockholders  of the Company held on April 16,
1997,  three  proposals  were voted upon by the Company's stockholders.  A brief
description  of each proposal voted upon at the Annual Meeting and the number of
votes cast for,  against and the number of  abstentions to each proposal are set
forth below.

        A vote was taken at the Annual Meeting for the election of ten Directors
of the Company to hold office until the next annual Meeting of  Stockholders  of
the Company and until their respective  successors shall have been duly elected.
The  aggregate  number of votes  cast by  holders  of  Common  Stock and Class A
Convertible Preferred Stock voted in person or by proxy for each nominee were as
follows:

                                                        For             Withheld
                                                        ---             --------
William R. Miller                                    5,589,203           305,364
John A. Spears                                       5,589,203           305,364
Alan C. Sartorelli Ph.D                              5,589,203           305,364
Michel C. Bergerac                                   5,589,203           305,364
Frank T. Cary                                        5,589,203           305,364
A. E. Cohen                                          5,589,203           305,364
James L. Ferguson                                    5,589,203           305,364
Michael C. Kent                                      5,589,203           305,364
E. Donald Shapiro                                    5,589,203           305,364
Walter Wriston                                       5,589,203           305,364

        A vote was taken at the  Annual  Meeting  on the  proposal  to amend the
Amended and  Restated  1993 Stock  Option Plan to increase  the number of shares
which may be issued thereunder. The aggregate number of votes cast by holders of
Common  Stock  and  Class A  Convertible  Preferred  Stock in person or by proxy
which:  (a) voted for, (b) voted  against or (c) abstained on such proposal were
as follows:

          For                      Against                       Abstained
          ---                      -------                       ---------

       4,163,685                   471,366                         9,865

        A vote was taken at the  Annual  Meeting on the  proposal  to ratify the
appointment of Ernst & Young LLP as auditors for the Company for the fiscal year
ending  December  31,  1997.  The  aggregate  number of votes cast by holders of
Common  Stock  and  Class A  Convertible  Preferred  Stock in person or by proxy
which:  (a) voted for, (b) voted  against or (c) abstained on such proposal were
as follows:

         For                      Against                        Abstained
         ---                      -------                        ---------
       5,878,927                   2,900                           12,740



                                    Page 11



        The  foregoing  proposals  are  described  more  fully  in the Company's
definitive  proxy statement  dated March 7, 1997,  filed with the Securities and
Exchange  Commission pursuant to Section 14(a) of the Securities Act of 1934, as
amended, and the rules and regulations promulgated thereunder.

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

        (a)     Exhibits.

            10.01 Clinical Development  Agreement between Vion  Pharmaceuticals,
                  Inc.,  Covance  Clinical  Research  Unit Ltd. and Covance Inc.
                  Confidential treatment has been requested for portions of this
                  exhibit.

            27.   Article 5 Financial Data Schedule for second quarter 1997.

        (b)     Reports on Form 8-K.

                None



                                    Page 12




                                   SIGNATURES

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


                                             VION PHARMACEUTICALS, INC.
                                             (Registrant)



                                             By: /s/ Thomas E. Klein
                                                -----------------------------
                                                Thomas E. Klein
                                                Vice President - Finance
                                                (Duly authorized signatory and
                                                 Chief Financial Officer)



Date:  August 14, 1997



Exhibit 10.01

     Confidential treatment has been requested for portions of this exhibit.
           The confidential portions are designated by brackets [ ].
                         CLINICAL DEVELOPMENT AGREEMENT
                               (this "Agreement")
                                     between
                    VION PHARMACEUTICALS INC.("The Sponsor")
                                FOUR SCIENCE PARK
                                    NEW HAVEN
                                    CT 06511
                                       USA

                                       and
                 Covance Clinical Research Unit Ltd ("Covance")
                           Phase II, Springfield House
                                   Hyde Street
                                      Leeds
                                     LS2 9NG
                                       UK

                                       and

    Covance Inc D/B/A Covance Clinical and Periapproval Services ("Covance")
                               210 Carnegie Center
                                    Princeton
                                New Jersey 08540
                                       USA


PREAMBLE

The Sponsor is a pharmaceutical  manufacturer which is currently considering the
evaluation  of  the  safety  and  efficacy  of  a  medicinal  product  known  as
Porfiromycin (the "Drug").

Covance is a Contract  Research  Organisation  ("CRO")  primarily engaged in the
business of managing  and  reporting  of clinical  trials of medical and related
products.

It is the  intention  of the Sponsor to contract to Covance the  preparation  of
clinical trial reports arising from clinical trials performed by Covance for the
inclusion in a regulatory submission dossier.








1.       STUDIES (Programme)

         The Sponsor hereby  requests from Covance and Covance agrees to perform
         the responsibilities  specified in (a) Section 2 of this agreement, (b)
         the Time and Cost Estimate,  as may be amended or modified from time to
         time (the "TCE") and attached  hereto as Exhibit A and (c) the Protocol
         as  may   hereinafter  be  provided  and  amended  from  time  to  time
         (hereinafter,  (a)-(c) collectively known as the "Studies") and Covance
         agrees to furnish to the Sponsor the final product  resulting  from the
         Studies.

         With the Sponsor's prior written  consent,  Covance shall be authorized
         to subcontract parts of the Studies to other companies  affiliated with
         it.  Covance shall not be authorized to conduct any Studies  concerning
         the Drug beyond those specifically  agreed to hereunder unless there is
         a written approved modification to this agreement from the Sponsor.

2.       OBLIGATIONS OF COVANCE

Covance shall

         a)       take  over the  responsibilities  as set  forth in the TCE and
                  adhere to the procedures agreed to in Exhibit A;

         b)       recruit clinical  investigators for the practical  performance
                  of the Studies  having the  necessary  training,  professional
                  qualification,  experience,  licenses to practice  medicine at
                  the  location   where  the  Studies  will  be  performed  (the
                  "Investigators")  and providing for  appropriate and available
                  Studies site and facilities;

         c)       provide all Investigators with all information on the Drug and
                  the Studies available to Covance and make all possible efforts
                  to assure  the  Investigators'  performance  of their  work in
                  accordance  with Exhibit A and any and all applicable laws and
                  regulations, including, but not limited to, generally accepted
                  principles  of  Good  Clinical  Practice,  which  include  the
                  Declaration of Helsinki and the ICH -Note for Guidance on Good
                  Clinical   Practice  and  the  United  States  Food  and  Drug
                  Administration ("FDA") requirements.

         d)       instruct  Investigators  orally and in writing to ensure  that
                  written  informed  consent is obtained from all trial subjects
                  and  properly  signed  with the  exceptions  described  in the
                  national regulations applicable to


                                       2





                  the conduct of the Studies;

         e)       have clinical  laboratory tests conducted only at laboratories
                  having the required licences or approvals;

         f)       require the  Investigators  to notify Covance  promptly of any
                  SAE (defined  below)  occurring to a trial subject  during the
                  Studies.  Assuming  the  Investigators  have  satisfied  their
                  reporting  obligations  to Covance,  Covance  shall inform the
                  Sponsor  within the time  frames  required  by the  respective
                  authorities  as stated in the Adverse  Event  Reporting  Plan,
                  specified in Exhibit B, attached hereto;

         g)       upon prior notification by the Sponsor,  assist the Sponsor in
                  co-monitoring Investigator sites and in conducting its audits;

         h)       notify the Sponsor  and supply all  pertinent  information  in
                  case  any  government  or  regulatory  authority  conducts  an
                  inspection  of any  investigational  site or takes  any  other
                  regulatory  action affecting the Studies and grant the Sponsor
                  the right to be present at any such  inspection  or regulatory
                  action;

         i)       regularly  inform  designated  personnel of the Sponsor on the
                  progress of the Studies by furnishing status reports including
                  in  particular  the  number  of   patients/subjects   entered,
                  withdrawn  and  completed  and  information  on  visits to the
                  Studies sites;

         j)       Covance  shall  instruct the study sites to destroy all unused
                  clinical supplies upon completion of the Studies;

         k)       disclose  promptly  to the  Sponsor or its nominee any and all
                  patentable inventions, discoveries and improvements concerning
                  the Drug or its use made  while  performing  the tasks for the
                  Studies and assign all its interests therein to the Sponsor at
                  the Sponsor's  first request and do all such acts which may be
                  necessary  for  patent  application  and  registration  in any
                  country,  provided  that the Sponsor  shall  fully  compensate
                  Covance for all time and money  spent,  and these  obligations
                  shall continue  beyond the  termination of this agreement with
                  respect to patentable inventions, discoveries and improvements
                  conceived or made by Covance while  providing  services to the
                  Sponsor pursuant to this agreement,  and shall be binding upon
                  Covance's   assignees,    administrators   and   other   legal
                  representatives;


                                       3





         l)       shall  indemnify  the  Sponsor  and its  officers,  directors,
                  employees  and agents from any loss,  damage,  cost or expense
                  (including reasonable attorney's fees) (a "Loss") arising from
                  any claim, demand,  assessment,  action, suit or proceeding (a
                  "Claim") for personal injury to study participants or personal
                  injury to any  employee  of the  Sponsor  or  property  damage
                  arising or  occurring  during the  conduct of the studies as a
                  result of Covance's gross negligence or intentional misconduct
                  or  inaction;  provided  that if such Loss or Claim  arises in
                  whole  or in  part  from  the  Sponsors  gross  negligence  or
                  intentional  misconduct  or  inaction,  then the amount of the
                  Loss that Covance shall indemnify the Sponsor for, pursuant to
                  this agreement, shall be reduced by an amount in proportion to
                  the  percentage  of the  Sponsor's  responsibilities  for such
                  Loss.


         m)       document  all data  received  in the course of the Studies and
                  store such data and related  records  until  completion of the
                  Studies  unless  otherwise  required  by  applicable  laws and
                  regulations.

3. OBLIGATIONS OF THE SPONSOR

                  The Sponsor shall  cooperate with and support Covance in order
                  that the Studies be completed  in a timely  manner and perform
                  the tasks  specified  in the TCE,  which are  allocated to the
                  Sponsor as specified therein. In addition, the Sponsor shall

                  a)       provide Covance  promptly with all information on the
                           Drug   relevant   to   the   Studies   including   an
                           Investigational Drug Brochure and any new information
                           concerning the Drug,  which becomes  available in the
                           course of the Studies,  specifically, any information
                           which  may  require  a change  in the  design  of the
                           Studies or its conduct;  especially,  any information
                           that may  indicate  changes  to the risk or health of
                           trial subjects in the Studies;

                  b)       submit in a timely manner  required  information  and
                           documents   to   relevant   authorities   and  ethics
                           committees,  including  required  updates  and obtain
                           necessary  licenses and approvals,  or enable Covance
                           to make such submissions, if applicable;

                  c)       keep adequate records of the clinical  supplies made,
                           and keep such information available for Covance's use
                           and provide suitable information to Covance to enable
                           Covance to instruct Investigators how


                                       4






                  to properly record, safely handle, store and use such clinical
                  supplies;

         d)       appoint a properly  qualified  person to liaise  with  Covance
                  concerning the conduct of the Studies;

         e)       In the  event  that  the  TCE  specifies  that  Covance  takes
                  responsibilty  for the reporting of the SAEs,  Covance will be
                  available 24 hours a day to deal with all SAEs and to take any
                  and all appropriate  measures with respect to SAEs required by
                  any laws, statutes,  ordinances and regulations.  For purposes
                  of  this  Agreement  an"SAE"is  as  described  in the  Serious
                  Adverse Event Reporting Plan (Exhibit B attached).

         f)       promptly provide full compensation and adequate  treatment for
                  trial subjects in the event of Studies related injury or death
                  according to national laws, and provide  indemnity  (legal and
                  financial  cover)  for the  Investigators  except  for  claims
                  resulting from malpractice and/or gross negligence;

         g)       promptly  analyse any reports received from Covance and notify
                  Covance of any apparent  inconsistencies  or suspected errors,
                  mistakes or risks;

         h)       shall indemnify Covance,  formerly Corning Besselaar, Inc. and
                  their  respective  affiliates and their  respective  officers,
                  directors, employees and agents from any CLAIM or LOSS arising
                  from or related to;
                  (i) personal injury directly or indirectly  caused by the Drug
or related to the Drug's harmful or otherwise unsafe effects, including a claim,
based on the use, consumption, sale or marketing of the Drug,
                  (ii) Covance's  performance of the Studies or its  obligations
                  under this  agreement,  the Studies or any aspect  thereof set
                  forth in the PROTOCOL that violates any applicable  law, rule,
                  regulation or ordinance or
                  (iii)  the   negligence,   gross   negligence  of  intentional
misconduct  or  inaction  of the  Sponsor;  provided  that if such LOSS or CLAIM
hereof arises in whole or in part from Covance's gross negligence or intentional
misconduct  or  inaction,  then the amount of such LOSS that the  Sponsor  shall
indemnify  Covance for pursuant to this agreement  shall be reduced by an amount
in proportion to the percentage of Covance's responsibilities for such LOSS.

                  Under no  circumstances  shall  the  Sponsor  be  entitled  to
incidental,  indirect,  consequential  or special  damages in connection  with a
default

                                       5






or breach of Covance's obligations under this agreement or any documents related
         hereto.

         i)       notify  Covance and supply all pertinent  information  in case
                  any government or regulatory authorities conduct an inspection
                  of any  investigational  site or  take  any  other  regulatory
                  action  affecting the Studies and permit Covance to be present
                  at any such inspection or regulatory action;

         j)       retain on file and  archive  all  records  and items  relating
                  specifically  to the  Studies  for the time  period and manner
                  required by applicable  law and  regulations  upon  completion
                  thereof  (e.g.,  complete case report forms,  other test data,
                  project  management  and  investigator's  files,  data  tapes,
                  reports,  etc.).  The Sponsor will make said records and items
                  available  to Covance  at no cost to enable  Covance to comply
                  with any and all regulatory  requests,  inspections or audits,
                  even after expiry of this agreement;

         k)       comply with all  obligations of the Sponsor under ICH-Note for
                  Guidance of Good Clinical  Practice and FDA  requirements  not
                  specifically  transferred to Covance by this agreement and its
                  Exhibit(s).

4.       CLINICAL SUPPLIES

         a)       After necessary ethics committees approvals have been obtained
                  and all regulatory  requirements for starting the Studies have
                  been met, the Sponsor shall,  at its expense,  supply the Drug
                  and other  clinical  supplies  required for the Studies at the
                  time and to the location indicated by Covance.

         b)       The Sponsor  warrants  that such  clinical  supplies will have
                  been  manufactured in sufficient  quantities and in accordance
                  with applicable Good Manufacturing Practice, and that they are
                  suitably  packed and  labelled in such a way that any blinding
                  procedure is ensured. In the event that the TCE specifies that
                  Covance arrange the clinical  packaging with a sub-contractor,
                  the Sponsor shall provide  Covance the necessary  instructions
                  to package and label the clinical supplies.

         c)       The  Sponsor   shall  supply   Covance   with  the   necessary
                  documentation  to import the Drug into the countries where the
                  Studies will be conducted.


                                       6








5        CONFIDENTIAL INFORMATION

         a)       All   information   transmitted   in   conjunction   with  the
                  implementation of the Studies,  whether prior to or subsequent
                  to the  execution  of  this  agreement,  concerning  the  Drug
                  furnished to Covance or its affiliates, employees or agents by
                  the Sponsor for the purpose of  preparing  the Studies and the
                  data generated for and  incorporated in the Studies by Covance
                  shall  belong  exclusively  to  the  Sponsor  and be  held  in
                  confidence by Covance (the "Confidential  Information") during
                  the Studies hereunder and for ten (10) years after termination
                  of this  agreement for whatever  reason.  Covance will neither
                  use the  Confidential  Information for its own benefit nor the
                  benefit of others.

         b)       Disclosure  will  only be made by  Covance  to its  employees,
                  affiliates,  agents or sub-contractors who have a need to know
                  the  Confidential  Information  and to  hospital  authorities,
                  Investigators,  their staff,  ethics committees and others who
                  are involved in the Studies;

         c)       Upon   termination   of  this   agreement   all   Confidential
                  Information shall be returned to the Sponsor;

         d)       The obligation of confidentially  hereunder shall not apply to
                  information that is or becomes publicly  available  through no
                  fault of  Covance,  is  disclosed  to Covance by a third party
                  entitled to disclose it, is already  known to Covance as shown
                  by its prior written records or is required by law or order of
                  an authority to be disclosed;

         e)       Any publication allowing  identification of the Sponsor or the
                  Drug  shall be made by  Covance  only with the  prior  written
                  consent  of  the  Sponsor.  Any  publication  by  the  Sponsor
                  containing data generated by Covance, the sponsor shall inform
                  Covance and state that the data was generated by Covance.

6.       TIME SCHEDULE

         Covance shall use its best efforts to perform the tasks for the Studies
         within  the  time  frame as  estimated  in the  TCE.  The TCE  assumes,
         however, the full cooperation of the Sponsor,  regulatory  authorities,
         ethics committees and Investigators,  and shall be subject to amendment
         from time to time  (including  as to costs) if the work for the Studies
         is delayed due to circumstances not


                                       7







         attributable  to Covance,  which  include,  but are not limited to, the
         following:

         a)       failure of the  Sponsor to deliver  the  medical  supplies  or
                  Studies related information in due time, or

         b)       amendments to previously agreed upon protocols,  procedures or
                  documents  required  for the  Studies  at the  request  of the
                  Sponsor, or

         c)       significant  delays in pre-Study meetings or in other tasks to
                  be performed by Covance caused by the Sponsor, or

         d)       delays in obtaining or  subsequent  withdrawal  of  regulatory
                  approvals  concerning  the  Studies,  or delays  in  receiving
                  ethics committees' opinions, or

         e)       death or  disability  of any  Investigator  or other  research
                  specialist to continue his or her work for the Studies, or

         f)       higher  ratio  of   drop-outs   among  trial   subjects   than
                  anticipated in the TCE (Exhibit A), or

         g)       lower  enrolment  rates  than  expected  and  agreed to by the
                  Sponsor and Covance, or

         h)       unforeseen   changes  in  the   relevant   medical   practice,
                  regulations, or

         i)       any other event or circumstance outside of Covance's control.

         Data management and statistical  analysis  timelines are based upon [ ]
         ([ ]) from the end of monitoring to the production of the final report.
         Within the stated [] weeks,  [] has been  allocated for client  review.
         The actual  dates are also  dependant  upon but are not  limited to the
         above listed a) - i)

7. COMPENSATION (FIXED PRICE)

         a)       The total price for the Studies is described in the TCE, which
                  specifies  Covance's fixed fees and out-of-pocket  expenses in
                  addition  to  fees  and  other  disbursements  to be  paid  to
                  Investigator's,  subcontractor's  and trial subjects (if any),
                  relating to the Studies on a pass-through basis.


                                       8








         b)       The cost of  deviations  in the Studies  outside of  Covance's
                  control  or  changes  in the  scope  of the  Studies  will  be
                  discussed with the Sponsor and  additional  work in connection
                  with the Studies will not be performed by Covance  without the
                  signature of the Sponsor on the respective  Charge Order Form.
                  Covance  shall  not be  obliged  to  perform  any work for the
                  Studies without proper compensation by the Sponsor.

         c)       The fees shall be invoiced by Covance in  accordance  with the
                  scheduled  milestones contained in the TCE. All invoices shall
                  be payable net without deduction within 30 days after the date
                  of  invoice.  Covance,  at its  discretion,  may  charge  a 3%
                  reminder  fee per month for  invoices  delayed by more than 30
                  days.

         d)       This  agreement is  denominated  in UK sterling  (pound).  Any
                  exchange  differences  arising  from  fluctuation  in exchange
                  rates will  accrue to the Sponsor and will be the subject of a
                  separate quarterly credit note or invoice.

         e)       The  calculation  of costs in the TCE  incorporates  an annual
                  inflation  rate  of 5% as it  relates  to  the  pharmaceutical
                  industry. Any inflation rate beyond [] will result in separate
                  quarterly invoice.


8.       TERMS AND TERMINATION

         This  agreement  shall  become  effective  upon the  execution  by both
         parties and shall  continue  until the Studies under this agreement has
         been completed  unless this  agreement is terminated  earlier as proved
         hereinafter.

         The Sponsor may terminate this agreement prematurely as follows:

         a)       If  Covance  fails to  perform  or  performs  negligently  any
                  material  work  in  accordance  with  this  agreement,   which
                  continues  uncured for 30 days after receipt of written notice
                  from the Sponsor;

         b)       if the Sponsor and/or any regulatory authority recognizes that
                  any adverse drug reactions necessitate  discontinuation of the
                  work for the Studies;

         c)       if   continuation   of  the  work  for  the  Studies   becomes
                  commercially  unfeasible,  by giving  Covance [] prior written
                  notice;

                                       9





         d)       if the Sponsor  licenses  the Drug to a third party who wishes
                  to conduct the remaining  part of the Studies  themselves,  by
                  giving Covance [] prior written notice.

         In the event of  termination  under item a), Covance shall be paid only
         for work properly completed and costs to which it is actually obligated
         such as Investigators fees, etc.

         In all  other  cases  Covance  shall  be  fully  paid  for all the work
         performed and all expenses incurred until termination becomes effective
         and  all  costs  relating  to  severance  of  subcontracts  or  service
         agreements as a result of such  termination.  In addition,  the Sponsor
         shall pay Covance [].

         In all cases of termination  hereunder,  the parties shall cooperate in
         order to ensure patient  safety,  continuity of treatment,  delivery of
         the works and compliance with all applicable regulations.


9.       FORCE MAJEURE

         No party  shall be liable  for any delay in  performance  or failure to
         perform this agreement, if due to an act of God or any other occurrence
         beyond the control of the respective  party;  provided,  however,  that
         performance  is resumed  promptly  following the end of the  occurrence
         causing delay or failure.

10.      MISCELLANEOUS PROVISIONS

         a)       Any  amendment  or  modification  to  this  agreement  and its
                  Exhibit(s)  shall be  effective  only if made in  writing  and
                  signed by both parties.

         b)       Except as expressly  provided  herein,  neither this agreement
                  nor any rights  arising  thereunder  shall be  assigned to any
                  third parties,  except  affiliates of the Sponsor and Covance,
                  without  the prior  written  consent of the other  party which
                  consent shall not be unreasonably withheld.

         c)       This agreement,  together with the attached  Exhibits,  is the
                  entire understanding between the parties hereto with regard to
                  the subject  matter  covered hereby and supersedes any and all
                  prior agreements or understandings between the parties whether
                  written or oral.

                                       10







         d)       Covance's  relationship  with the Sponsor under this agreement
                  shall  be  that  of  an  independent  contractor  and  nothing
                  contained herein or considered hereby shall constitute Covance
                  or any of its subcontractors,  auxiliaries or employees as the
                  Sponsor  or as  employees,  joint  venture,  or partner of the
                  Sponsor.

         e)       Neither party shall during the term of this  agreement and for
                  one year thereafter  solicit for employment either directly or
                  indirectly any employees of the other or its  affiliates,  who
                  became  familiar  with it as the  result  of the  work for the
                  Studies.

                  In case of  breach  of this  provision  by one party the other
                  party  shall,  in addition to other  remedies,  be entitled to
                  specific  performance  and  enforcement  thereof  by  judicial
                  injunction.

         f)       Should  any  of the  provisions  hereof  be  held  invalid  or
                  unenforceable, the validity and effect of the other provisions
                  of this agreement shall not be affected thereby.

         g)       The waiver or the  failure to claim a breach of any  provision
                  of this  agreement  by either  party  shall not  constitute  a
                  waiver or estoppel  with respect to any  subsequent  breach or
                  with respect to any other provision thereof.

         h)       Any notices given or required to be given  hereunder  shall be
                  effective  if delivered  personally  or mailed by certified or
                  registered  mail to the other party at the address first given
                  above or such other  address or  addresses of which such party
                  shall have given notice.

11.      GOVERNING LAW

         This agreement shall be governed by UK substantive law.


                                       11







IN WITNESS  WHEREOF,  the parties  have caused this  agreement to be executed by
their duly authorized officers.


                    /s/ Thomas Mizelle
- ------------------- -----------------------------
SIGNATURE                                 on behalf of Vion Pharmaceuticals Inc.

                    Thomas Mizelle
- ------------------- -----------------------------
PRINT NAME


                    Vice President Operations
- ------------------- -----------------------------
TITLE

                    6/25/97
- ------------------- -----------------------------
DATE


                    /s/ Dr F J Mills
- ------------------- -----------------------------
SIGNATURE                                      on behalf of Covance Clinical and
                                               Periapproval Services Ltd

                    Dr F J Mills
- ------------------- -----------------------------
PRINT NAME         

                    Senior Vice President, Europe
- ------------------- -----------------------------
TITLE

                    18th June 97
- ------------------- -----------------------------
DATE


                    /s/ Eddie Caffrey
- ------------------- -----------------------------
SIGNATURE                                         on behalf of Covance CRU Ltd.

                    Mr Eddie Caffrey
- ------------------- -----------------------------
PRINT NAME         


                    Managing Director
- ------------------- -----------------------------
TITLE

- ------------------- -----------------------------
DATE

                                       12










                            TIME AND COST ESTIMATION

                                       FOR

                            VION PHARMACEUTICALS INC.
                                FOUR SCIENCE PARK
                                    NEW HAVEN
                                    CT 06511
                                       USA





        =================================================================

                       PORFIROMYCIN IN HEAD & NECK CANCER

        =================================================================










This  estimation is valid for 30 days for the clinical trial in accordance  with
the assumptions  that have been listed within.  Materials  contained within this
proposal are confidential  and except for data provided by Vion  Pharmaceuticals
Inc are the property of Covance.

                                                           Dated: 23rd June 1997








                                TABLE OF CONTENTS
                                -----------------
I. INTRODUCTION................................................................3
II. BACKGROUND AND RATIONALE...................................................3
(I) PHASE II TEAM ONCOLOGY EXPERIENCE..........................................4
(II) EXAMPLES OF PERSONNEL PROFILES............................................5
III. STUDY DESIGN SUMMARY......................................................7
IV COVANCE TASKS...............................................................7
(A) OVERALL PROJECT MANAGEMENT.................................................7
(B) REGULATORY SUBMISSIONS.....................................................8
(C) PROTOCOL REVIEW............................................................8
(D) CASE REPORT FORM (CRF) AND MONITORING CONVENTIONS DEVELOPMENT..............8
(E) LABORATORY SELECTION.......................................................8
(F) INVESTIGATOR SELECTION.....................................................9
(G) PRE-STUDY SITE VISITS......................................................9
(H) INVESTIGATOR BUDGET MANAGEMENT.............................................9
(I) INVESTIGATOR PACKAGE......................................................10
(J) TRANSLATIONS..............................................................10
(K) INVESTIGATOR MEETINGS.....................................................11
(L) DRUG SUPPLY MANAGEMENT....................................................11
(M) INTERACTIVE VOICE RESPONSE SYSTEM (IVRS)..................................12
(N) INITIATION, MONITORING AND CLOSE OUT VISITS...............................12
(O) STATUS REPORTING..........................................................13
(P) ICH GCP SITE AUDITS.......................................................13
(Q) ADVERSE EXPERIENCE REPORTING..............................................14
(R) CLINICAL DATA MANAGEMENT AND BIOSTATISTICS................................15
   o Data Entry...............................................................15
   o Data Review and Clean-Up.................................................15
   o Programming..............................................................16
   o Preparation of the Interim Analyses......................................16
   o Statistical Analysis.....................................................16
   o Preparation of the Statistical and Clinical Trial Reports................17
(S) CONTRACT MANAGEMENT.......................................................17
(T) DEVELOPMENT AND MAINTENANCE OF AN E-MAIL SYSTEM...........................17
V STUDY SYNOPSIS AND TIMELINES................................................19
VI PROJECT RESPONSIBILITIES ASSESSMENT........................................20
VII. GLOBAL COST ESTIMATION...................................................21
VIII. CLINICAL AND BIOSTATISTICAL ASSUMPTIONS.................................22
IX. OUT OF POCKET STUDY COSTS.................................................23
X. PAYMENT SCHEDULE...........................................................24
XI. TOTAL ESTIMATED COSTS (EXCLUDING OUT-OF-POCKET EXPENSES)..................25
XII. SUMMARY AND CONCLUSIONS..................................................25
ATTACHMENT I.
ORGANOGRAM................................................................25

                                       2








                           INTRODUCTION AND BACKGROUND
                           ---------------------------

I.       INTRODUCTION

         Vion  Pharmaceuticals have asked Covance CRU Ltd (Covance) to provide a
         Time and Cost Estimate (TCE) for providing  Clinical and Biostatistical
         services for a Phase III, double-blind, randomised,  placebo-controlled
         study of porfiromycin  when used as an adjuvant to radiation therapy in
         patients with Head and Neck Cancer

         This proposal provides a description of the tasks Covance will perform,
         as discussed with Vion  Pharmaceuticals  to complete this program.  The
         proposal   also   provides   an   operational   plan   describing   the
         implementation and management of the program,  including  communication
         channels between Vion Pharmaceuticals and Covance world-wide. Timelines
         and costs associated with this program have been developed and outlined
         herewith in detail, including the assumptions that Covance has used for
         generation of this proposal.  Changes to these  assumptions may have an
         impact on the timelines and costs provided herein.

II.      BACKGROUND AND RATIONALE

         Covance's  European  Phase II  Clinical  group was  created in December
         1994.  Based in the  Maidenhead  office the group is  comprised  of ten
         Clinical Research  Associates  (CRAs),  who are supported by 2 Clinical
         Studies  Assistants  and a Project  Secretary.  The  clinical  team has
         experience of managing  projects in a number of  therapeutic  areas and
         six of the ten CRAs have experience of monitoring in Europe.

         Covance's European Phase II Biostatistics  group was created in 1995 to
         provide  data  management,  statistical  analysis  and  report  writing
         services  for Phase II  European-based  clinical  trials,  conducted by
         Covance.   In  addition  to  this,  the  group  is  ideally  suited  to
         stand-alone analysis and reporting of smaller trials from all phases of
         clinical research.

         Covance will be responsible for []

         The success of the Vion  program will depend upon many  factors,  which
         include: clarity of program goals and complexity, and the establishment
         of an enthusiastic and well-integrated Vion Pharmaceuticals and Covance
         project team with well-defined

 
                                        3





         roles and  responsibilities  for team members.  A Covance team has been
         actively  working  on  the  Vion  Pharmaceuticals   program  with  Vion
         Pharmaceuticals since [].

         The  productive  relationship  Vion  Pharmaceuticals  and Covance  have
         shared will help to minimise  the time spent on  administrative  issues
         such as establishing acceptable billing procedures,  standard operating
         procedures, and reporting of project information. Experienced personnel
         will be  placed  in key  positions  to ensure  that  Covance  meets its
         responsibilities for the program. The below table provides a summary of
         the Phase II personnel's specific oncology  experience.  Also, examples
         of  personnel  profile  for  clinical  and  biostatistical   staff  are
         enclosed.  An  organogram  of  specific  personnel  is  illustrated  in
         Attachment II.

<TABLE>
<CAPTION>
         (I)      PHASE II TEAM ONCOLOGY EXPERIENCE

         ------------------ -------------------- ----------- --------------- ======================================

            INDICATION             DRUG            PHASE        PATIENTS                    CENTRES

         ------------------ -------------------- ----------- --------------- ======================================
         <S>                <C>                  <C>         <C>             <C>    
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Breast Cancer      [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Pancreatic Cancer  [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Pancreatic Cancer  [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Pancreatic         [ ]                     [ ]           [ ]        [ ]
         Cancer
         ongoing
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Gastric Cancer     [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Breast Cancer      [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Ovarian Cancer     [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         All Solid Tumours  [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         NSCLC              [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         AML                [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================


                                       4






         ------------------ -------------------- ----------- --------------- ======================================
         SCLC               [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         Breast Cancer      [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
         ------------------ -------------------- ----------- --------------- ======================================
         CML                [ ]                     [ ]           [ ]        [ ]
         ------------------ -------------------- ----------- --------------- ======================================
</TABLE>

         In addition  to the above  experience  we have also  written a PK study
         protocol of []


         (II)     EXAMPLES OF PERSONNEL PROFILES

         EXAMPLE OF PERSONNEL PROFILE - CLINICAL
         ---------------------------------------

         This study will be managed by 1 Principal Clinical Research  Associate,
         4 Clinical Research Associates (based in the UK, Spain and Germany) and
         assisted by 1 Clinical Studies  Assistant.  The team may draw upon CRAs
         in other European offices as required.

         Project Director is a Principal Clinical Research Associate (PCRA). The
         PCRA has []  years  monitoring  experience  throughout  Europe  and has
         experience of monitoring and managing oncology studies.

         Project  Physician is a Medical  Oncologist  who also has several years
         experience  in  Medical  Oncology  within the  Pharmaceuticals  and CRO
         industry.

         Monitors are [] Clinical  Research  Associate  (CRA).  The CRAs have at
         least [] years monitoring  experience  throughout  Europe and will have
         experience of monitoring and managing oncology studies.

         The US study will be managed by an RMS Project  Leader and  assisted by
         [] RMS Associates.

         Regional  Monitoring  Services  Project  Leader  (RMS PL).  The Project
         Leader has [] years  experience  in  monitoring  and managing  clinical
         trials.

         Regional Monitoring Services Monitoring Associate (RMS Assoc.). The RMS
         Assoc.'s have at least [] years  monitoring  experience  throughout the
         US.

         Clinical Studies Assistant (CSA) would provide  Administrative  support
         to the study.

                                       5







         EXAMPLE OF PERSONNEL PROFILE - BIOSTATISTICS
         --------------------------------------------

         The  biostatistical  function  of  the  study  will  be  managed  by  a
         Biometrics  Manager and  assisted by data entry,  data  management  and
         statistical programming personnel.

         Project   Coordinator   is  a  Biometrics   Manager   within  Phase  II
         Biostatistics  with  appropriate  data  management and  programming and
         statistical  experience,  in a  Clinical  Research  Organisation  (CRO)
         environment  and  pharmaceutical  company.  The PC has a  post-graduate
         qualification  in statistics and has worked in a variety of therapeutic
         areas.

         Statistical Programmer will provide statistical programming support for
         production of Tables,  Figures and Listings. The statistical programmer
         has a first degree in a statistical subject.

         Data Coordinator will carry out data management of Case Report Forms to
         provide the  statistician  with a clean database.  The data coordinator
         has a first degree in a life science.

         Data Entry  Operators  will carry out data entry of Case Report  Forms.
         The data entry  supervisor has [] years  experience of working within a
         Clinical Research Organisation.

         The PC and project  team are focused by the needs of the  customer  and
         are  responsible for ensuring that the project meets all the objectives
         against the agreed specifications.


                                       6







III.     STUDY DESIGN SUMMARY

         The Vion  Pharmaceuticals  Phase III trial for the  treatment of Head &
         Neck cancer will be conducted in the UK, France, Spain, Germany and the
         U.S. The trial is a double-blind, randomised,  placebo-controlled study
         of  porfiromycin  when used as an adjuvant to  radiation  therapy.  The
         primary  endpoint  is the  time to  treatment  failure  over a two year
         follow-up. In addition, secondary endpoints are tumour recurrence rate,
         disease free survival time and overall survival.

         The  statistical  analysis  will be carried  out on an  intent-to-treat
         basis.  Patients must have received  radiation therapy and at least one
         dose of study medication.

         [] will be performed unblinded by an independent Covance Statistician.

         []

         []

         []

         []

         Statistical  analysis will be performed using SAS. Tables,  figures and
         listings  will be produced by SAS and stored in ASCII  output files for
         inclusion in the clinical trial report.

IV       COVANCE TASKS

         (A)      OVERALL PROJECT MANAGEMENT

                  Overall  responsibility  for this  study  lies with the Global
                  Project  Director,  as shown on the organogram,  Attachment I.
                  Vion  Pharmaceuticals  and Covance  will discuss on an ongoing
                  basis any modification to the project team that is required to
                  expedite the program.

 
                                        7







         (B)      REGULATORY SUBMISSIONS

                  Covance will  prepare the  regulatory  submissions  for Europe
                  (France,  UK, Spain and Germany) and the USA. Covance European
                  Regulatory group have a separate  agreement directly with Vion
                  Pharmaceuticals.

         (C)      PROTOCOL REVIEW

                  Vion  Pharmaceuticals  has  prepared  the head and neck cancer
                  trial  protocol,  no.  PORF-96-001.  Covance  will  review the
                  protocol extensively in preparation for investigator selection
                  and pre-study visits.


         (D)      CASE REPORT FORM (CRF) AND MONITORING CONVENTIONS DEVELOPMENT

                  Covance  will  develop  a CRF.  The CRF will be  reviewed  and
                  approved according to the Covance CRF review process.  The CRF
                  will be  designed to capture all  pertinent  information  in a
                  format that allows for rapid review and data entry.

                  The same CRF will be utilised for Europe and the USA.  Covance
                  will produce monitoring conventions.

                  The final size of the CRF is 176 pages, this is the assumption
                  used in the cost estimation.

                  Covance  will be  responsible  for  managing  the printing and
                  shipping  of  the  CRFs,  monitoring   conventions  and  other
                  ancillary forms to the investigational sites.

                  All CRFs  will be  printed  in the UK.  Covance  will  monitor
                  investigational site's needs requesting shipment of additional
                  supplies  and  verifying  shipment of supplies  (ie;  CRFs and
                  accompanying forms) to the sites.


         (E)      LABORATORY SELECTION

                  The hospital laboratory at each investigational centre will be
                  used for routine clinical  chemistry,  haematology and urinary
                  evaluations.

                                       8





         (F)      INVESTIGATOR SELECTION

                  Covance  in  collaboration  with  Vion   Pharmaceuticals  will
                  identify  an adequate  number of  potential  investigators  to
                  yield a total of [] qualified investigators.

                  The physicians  that Covance  recruit for this trial will have
                  the relevant and necessary  oncology  experience  required for
                  the purpose of this program.

                  Covance  anticipates that [] will be located in the USA and []
                  will be located in Europe.

                  For  purposes  of this  Time and Cost  Estimate,  Covance  has
                  assumed that the total number of investigational sites is [].


         (G)      PRE-STUDY SITE VISITS

                  Covance has assumed that its monitors  will conduct a total of
                  [] pre-study site visits in order that a selection of [] sites
                  may be determined to conduct this program.

                  During each  pre-study  site visit,  the Covance  monitor will
                  evaluate   the   investigator   in  detail  for   professional
                  experience  and  training,   prior  experience  in  conducting
                  clinical  drug  trials,   access  to  an  adequate  number  of
                  appropriate    patients,   an   adequate   interest   in   and
                  understanding  of the protocol,  a required  level of staffing
                  (preferably    including   the   availability   of   a   study
                  co-ordinator), adequacy of facilities, current workload and an
                  understanding of regulatory requirements.

                  Vion  Pharmaceuticals  and  Covance  will  agree on the  final
                  selection of investigators.


         (H)      INVESTIGATOR BUDGET MANAGEMENT

                  Covance will be responsible for negotiation,  maintenance, and
                  payment of investigator budgets for all investigational  sites
                  in liaison with Vion Pharmaceuticals. Vion Pharmaceuticals has
                  provided   Covance  with   guidelines  for   negotiating   all
                  investigator  budgets.  Investigator  costs  are  pass-through
                  costs (out-of-pocket expenses) to Vion Pharmaceuticals.

 
                                        9





         (I)      INVESTIGATOR PACKAGE

                  An Investigator package is a collection of documents including
                  Regulatory  Authority  and Ethical  Committee  approval  for a
                  study and individual  sites.  The purpose of the  investigator
                  package is to ensure that all  necessary  documentation  is in
                  place for a study and a site before study drug is released.

                  Covance Regulatory  Affairs and Clinical Research  Departments
                  will  prepare an  investigator  package  plan  describing  the
                  requirements  and general  procedures  regarding  the content,
                  review and approval of the investigator  package necessary for
                  the release of study medication to clinical study sites.  This
                  approval is called the "regulatory green light".  Covance will
                  verify the  completeness and accuracy of the first package for
                  each country before  approving  shipment of study  medication.
                  Covance will be  responsible  for approving  shipment of study
                  medication for subsequent shipments within each country.

                  Covance  will  prepare  and  submit   local   clinical   trial
                  applications where appropriate in European countries.

                  Additionally,  Covance will be  responsible  for ensuring that
                  the   Principal   Investigator   maintains   and   updates  an
                  Investigator/Regulatory  Documents file at each site. The file
                  will   include  but  not  be  limited  to:  the  protocol  and
                  amendments,   Investigators'  Drug  Brochure,  IRB  or  Ethics
                  Committee  approval  letters,  FDA 1572 form,  consent  forms,
                  safety   updates,   correspondence,   and   other   regulatory
                  documents.


         (J)      TRANSLATIONS

                  Covance will be responsible for ensuring accurate and complete
                  translation of informed consent forms, IRB or Ethics Committee
                  approval letters,  and significant  regulatory  correspondence
                  upon request.  Costs have not been included for translation of
                  investigator  CVs.  Covance  will use  translators  located in
                  Covance's  European  offices  or will  contract  with  outside
                  translators  for  translation  into 3 languages (ie;  Spanish,
                  French  and   German).   Covance  will  be   responsible   for
                  back-translation to English.

                  Covance will be responsible  for the  translation and drafting
                  of country  specific  labels.  Covance will be responsible for
                  back-translation certification of the final labels.


                                       10






         (K)      INVESTIGATOR MEETINGS

                  Covance will organise and conduct two Investigators'  Meetings
                  for the Vion  Pharmaceuticals  program.  One  meeting  will be
                  conducted in Europe for the European investigational sites and
                  one meeting will be  conducted in the U.S. for North  American
                  sites.  Each  meeting  will  gather  investigators  and  study
                  co-ordinators participating in the trial.

                  Covance  will  work  to  produce  the  meeting  agenda  and be
                  responsible for the organisation of the meetings. Each meeting
                  will  be  conducted  in  English.  In  Europe,  local  Covance
                  representatives  will  assist  with  translation  in  case  of
                  English translation difficulties.  If necessary, data flow and
                  management operations will be highlighted. Expeditable Adverse
                  Experience  reporting  processes will be emphasised as well as
                  ICH-GCP guidelines.  Procedures for screening patients will be
                  reviewed in detail.



         (L)      DRUG SUPPLY MANAGEMENT

                  Covance will be  responsible  for managing all  packaging  and
                  primary labelling of clinical drug supplies for the trial. For
                  Europe,  Covance will be responsible  for the  translation and
                  drafting  of  country  specific  labels,   including  national
                  regulatory  requirements.  Covance  will  be  responsible  for
                  back-translation certification of the final labels.

                  Covance  will be  responsible  for  shipment of clinical  drug
                  supplies to  investigational  sites in North America.  Covance
                  Packaging  will be  responsible  for shipment of clinical drug
                  supplies to investigational  sites in Europe.  Covance will be
                  responsible for obtaining  import licenses where it is a local
                  requirement.

                  Covance  Packaging will be responsible for affixing  secondary
                  labels to the clinical  drug  supplies at the time of shipment
                  to an investigational  site in Europe.  These secondary labels
                  will  include  the  investigators  name,  address,   telephone
                  number, and site number.

                  Covance will have procedures in place to allow for shipment of
                  clinical drug supplies to an investigational site when Covance
                  has authorised the regulatory  package  approval for the site.
                  Vion  Pharmaceuticals  will be  responsible  for ensuring that
                  ample supply of study medication is available for the duration
                  of the program for  re-supply  of  clinical  drug  supplies to
                  investigational sites.

  
                                       11





                  At the investigational  level, Covance will be responsible for
                  drug   management,   inventory,   and  resupply   through  the
                  Interactive  Voice  Response  System  (IVRS).  Covance will be
                  responsible    for    monitoring   of   drug    accountability
                  documentation  and  destruction  of  clinical   supplies,   as
                  requested, either centrally at a subcontractor or locally.

         (M)      INTERACTIVE VOICE RESPONSE SYSTEM (IVRS)

                  Covance's IVRS will be utilised for this trial.  The IVRS will
                  provide   computerised   patient   randomisation  and  patient
                  assignment using  touch-tone  telephone input and computerised
                  voice output.  The system will be multi-lingual and provide an
                  option for randomisation in either English, French, Spanish or
                  German. Accessibility will be provided via toll-free telephone
                  numbers for all  countries and the system will be available 24
                  hours a day for patient assignment.

         (N)      INITIATION, MONITORING AND CLOSE OUT VISITS

                  INITIATION VISITS:
                  ------------------

                  Investigational  sites  will be  initiated  by a member of the
                  Covance project team.  Prior to each  Investigators'  Meeting,
                  Covance will conduct a training session for all CRAs that will
                  be  conducting  initiation  visits.  Covance will schedule the
                  initiation  visit  once  Covance  Regulatory  Department  have
                  approved the package of  investigators'  regulatory  documents
                  that Covance has compiled and authorised  shipment of clinical
                  drug supply. The visit will involve all appropriate members of
                  the  investigators'  team. The Covance  monitor will conduct a
                  thorough review of the protocol, CRF, regulatory requirements,
                  inventory and storage of clinical drug supplies, and any other
                  study specific issues.

                  MONITORING & CLOSE-OUT VISITS:
                  -----------------------------

                  Covance  has  assumed  that  the  initial  monitoring  of each
                  investigational  site will occur shortly after the study staff
                  has  enrolled  its first  patient  at the site.  Covance  will
                  conduct subsequent routine monitoring visits []. If necessary,
                  Covance will monitor  sites more  frequently.  However,  costs
                  have not been  included  in this  proposal  for []. The actual
                  monitoring  frequency  of a site  will  depend  upon  the site
                  meeting its enrolment goals and the number of studies the site
                  is conducting. Covance will review the monitoring needs of the
                  project regularly. Covance has assumed a total of []


                                       12







                  routine monitoring visits for Europe and [] routine monitoring
                  visits for the USA in this Time and Cost Estimate.

                  Covance believes that on-site monitoring is the most important
                  step in the data quality  assurance  process.  Thus, our field
                  monitoring  is intense  and  includes  verification  of source
                  documents   against  CRF  entries.   Covance  monitors  verify
                  information   recorded   in  a  CRF   for   completeness   and
                  transcription accuracy against the information included in the
                  patient's medical chart. Documentation required in the medical
                  charts  and other  sources  include  inclusion  and  exclusion
                  criteria, primary efficacy endpoints, adverse experiences, and
                  concomitant  medications.   Covance  will  develop  monitoring
                  conventions specific to this trial.

                  As part of routine  monitoring,  Covance  monitors will review
                  the Study File Notebook and pharmacy drug dispensing  records,
                  inspect drug supplies, and ensure appropriate drug storage.

                  Covance  will  produce   monitoring   trip  reports  for  each
                  monitoring  visit  within []  working  days of the  monitoring
                  visit.  This  will be  available  to Vion  Pharmaceuticals  on
                  request.  Covance  anticipates that these reports will provide
                  detailed   information   about   patient   accrual,    adverse
                  experiences, regulatory compliance, and study conduct. Between
                  monitoring  visits,  Covance will maintain frequent  telephone
                  contact  with each  investigational  site to  discuss  patient
                  accrual  activity,  adverse  experiences,  and any other study
                  related issues.

                  Covance will close out each  investigational  site at the time
                  of the final  monitoring  visit.  Covance monitors will ensure
                  that all site  documentation  is complete and  accessible  for
                  future  audits,  that the  investigator  is  aware of  his/her
                  responsibilities,   and  that  all  remaining  clinical  trial
                  materials  to be returned to Vion  Pharmaceuticals  or Covance
                  Packaging are removed from the  investigational  site. Covance
                  will provide a final visit report to Vion  Pharmaceuticals for
                  each site.


         (O)      STATUS REPORTING

                  Covance will provide  monthly  project  status reports to Vion
                  Pharmaceuticals.


         (P)      ICH GCP SITE AUDITS

                  Covance will conduct ICH GCP field audits for this study.  The
                  field audits will include  sites  audited on a random basis or
                  for-cause.  Random  audits will involve  visits to an adequate
                  number of investigational sites to ensure that the

  
                                     13






                  investigator is conducting the study according to the protocol
                  and applicable  regulations.  Covance has estimated a total of
                  [] site  audits to be  conducted  ([] in Europe and [] in USA)
                  for the  purpose of this cost  estimate.  Covance  has assumed
                  that [], this  depends on the number of patients  recruited at
                  each investigational site.


         (Q)      ADVERSE EXPERIENCE REPORTING

                  Up to [] all adverse experiences will be collected on the case
                  report form and all expeditable adverse  experiences  (serious
                  adverse   experience,   unexpected   adverse   experience   or
                  withdrawals  due to  adverse  experiences)  will be  collected
                  using the Covance SWAER form.

                  After [] and until the patient  withdraws from the study,  all
                  serious adverse  experiences  will continue to be collected on
                  the case report form.  The Covance  SWAER form will be used to
                  collect all deaths, all unexpected adverse experiences and any
                  adverse experiences that are related to the study drug.

                  Once the Covance  SWAER form is  completed  it will be sent to
                  Drug Safety  Co-ordination,  Europe for all  European  adverse
                  experiences  and to  the  Clinical  Project  Team  for  all US
                  adverse  experiences.  Once in Covance the expeditable adverse
                  experience  will  have  a  narrative  written  (if  one is not
                  already  available),  be  medically  reviewed and entered into
                  Clintrace.  Printed  Covance SWAER forms will be generated and
                  sent to Vion Pharmaceuticals with a copy to the Global Project
                  Director,  the Project Physician,  the US Project Manager (for
                  US adverse experiences only) and the site monitor.

                  Drug Safety Co-ordination, Europe or Princeton (depending upon
                  the  Regulatory  Authority)  will make the  submission  to the
                  Regulatory Authorities on behalf of Vion Pharmaceuticals.

                  24 HOUR MEDICAL COVER

                  In order to comply with the  guidelines  applicable to the UK,
                  it is necessary to provide 24hr medical  cover for this trial.
                  This service will be extended to all sites in all countries.

                  The patient  will be advised to contact  his/her  investigator
                  should they have any concerns or experience any adverse event.
                  They will be issued a patient alert card for this purpose.

                  The  investigator  will be able to contact  the site  monitor,
                  Project  Director,  medical  monitor or other Covance  on-call
                  medic.


                                       14




                  Work  performed  by the  Global Medic  will be accrued  on  an
                  hourly basis and invoiced periodically.

         (R)      CLINICAL DATA MANAGEMENT AND BIOSTATISTICS

                  Covance will be  responsible  for data  management  activities
                  through provision of a Clinical Trial Report.

                  Covance   will  conduct  all  data   management,   statistical
                  programming and statistical analysis activities at Maidenhead,
                  UK.

                  For the purposes of this Time and Cost  Estimate,  Covance has
                  assumed that the CRF for this trial be 176 pages in length.


                  o        DATA ENTRY

                  Covance will design the database structure.

                  The Case  Report  Forms  (CRFs)  will be  returned  by Covance
                  monitors  from the sites to,  Maidenhead,  where  they will be
                  inventoried,   and  logged  into  the  CRF  Tracking   System.
                  Following the logging process, CRFs will be prepared for entry
                  into the computer.  Data Processing  personnel create and test
                  the data entry screens corresponding to the Case Report Forms.
                  Entry of the data will be performed on an ongoing basis by two
                  independent  operators;  one operator  performs the entry step
                  and the second operator performs the double-key,  verification
                  step.  No CRF is released from Data Entry unless all data have
                  been verified.


                  o        DATA REVIEW AND CLEAN-UP

                  The data validation process will begin with the preparation of
                  a Data Handling  Manual (DHM) that specifies the  computerised
                  validation checks,  table  specifications,  query conventions,
                  data dictionary, and coding plan. The DHM will be developed at
                  the time  the CRF  Monitoring  Conventions  (i.e.,  rules  for
                  completing  the CRF) are developed to assure  consistency  and
                  appropriateness in approach to data collection and handling.

                  Medications mapping will be provided by Covance.  Data element
                  mapping  will use the  following  coding  dictionaries  unless
                  otherwise indicated by Vion Pharmaceuticals:

                  -        Adverse Events will use the COSTART mapping terms


                                       15








                  -        Concomitant Medication will use the WHO mapping terms

                  To assure data quality,  Covance will conduct a database audit
                  (a sampling of the database  verified  with the hard copy CRF,
                  item by item). Data  Co-ordination  personnel will conduct the
                  random sample audit of datapoints against the Case Report Form
                  to quantify the keying error rate of the files. In addition, a
                  []  of   complete   CRFs  and  a  []  (as  agreed   with  Vion
                  Pharmaceuticals)  will be checked against the database. If the
                  error rate is 0.5% or less, Covance accepts the file. [].


                  o        PROGRAMMING

                  Covance will be responsible for all the  programming  tasks to
                  include  programming  for  computerised  diagnostics,  Tables,
                  Figures and  Listings,  Final  analyses and data  transfers to
                  Vion Pharmaceuticals as necessary.

                  All  programs  used will be  documented  and  validated  using
                  standard  programming  conventions  established in the Covance
                  Statistical Programming Guidelines.


                  o        PREPARATION OF THE INTERIM ANALYSES

                  Covance will prepare an [] (as detailed in the protocol) after
                  [].  Covance will  perform the  analysis and generate  summary
                  tables.  The [] will be performed on "clean"  (i.e.,  reviewed
                  and corrected) data for the above  mentioned data  parameters.
                  An  independent  statistician  from  Covance will perform this
                  analysis  and will be  identified  to serve as a liaison  with
                  Vion Pharmaceuticals.  To maintain the integrity of the study,
                  results will remain blinded except to the liaison from Covance
                  and Vion Pharmaceuticals.


                  o        STATISTICAL ANALYSIS

                  Covance will be responsible  for  development of a Statistical
                  Analysis  Plan (SAP)  which  details the way in which the data
                  will be presented and analysed. The SAP will include a written
                  section  followed  by  mock-ups  of the  Tables,  Figures  and
                  Listings.


                                       16








                  Covance will be responsible for the final statistical analysis
                  and the Clinical  Trial  Report.  The SAP will be sent to Vion
                  Pharmaceuticals for review and approval.


                  o        Preparation  of the  Statistical  and Clinical  Trial
                           Reports

                  Covance will be  responsible  for generation of Clinical Trial
                  Reports.  The  Clinical  Trial  Report  will be  based  on the
                  standard   Covance  Clinical  Trial  Report  unless  otherwise
                  stipulated by Vion Pharmaceuticals.  A skeleton Clinical Trial
                  Report will be sent to Vion  Pharmaceuticals  for  approval of
                  style and contents.


         (S)      CONTRACT MANAGEMENT

                  The  contract  with  Vion  will be held by the  Phase II group
                  based  in  Maidenhead,  UK.  The  Phase II  group  issues  its
                  contracts  in the  name of  Covance  Clinical  Research  Unit,
                  Leeds.

                  The Time and Cost  Estimate  will be  denominated  in  English
                  pounds sterling  ((pound)) and will be fixed price for Covance
                  fees with out-of-pockets and Investigator payments being first
                  estimated and later invoiced to the client on a monthly basis.

                  Any exchange  differences arising from fluctuation in exchange
                  rates  will  accrue  to Vion  Pharmaceuticals  and will be the
                  subject of a separate quarterly credit note or invoice.

                  Covance   Phase  II   business   development   staff  will  be
                  responsible  for the issue of any Change  Order due to changed
                  assumptions  which has an impact on the costing.  The Time and
                  Cost Estimate  will be reviewed  every two months until such a
                  time as Covance  and Vion  Pharmaceuticals  agree a  different
                  frequency.

                  It is the  intention of the Covance Phase II group to obtain a
                  signed  contract  (Clinical   Development   Agreement)  before
                  enrolling patients into the trial.


         (T)      DEVELOPMENT AND MAINTENANCE OF AN E-MAIL SYSTEM

                  Covance will  develop and maintain an E-mail  system that will
                  allow communication  between Vion  Pharmaceuticals and Covance
                  offices  world-wide  for exchange of messages  and  documents.
                  Covance  currently  has an E-Mail  system that is  operational
                  within Vion  Pharmaceuticals.  The existing E-mail  connection
                  between Vion Pharmaceuticals and Covance will be used to


                                       17






                  transfer messages between organisations.  Vion Pharmaceuticals
                  and  Covance  will  develop  a list of  project  team  members
                  needing E-mail access.



                                       18






                    ESTIMATION FOR CLINICAL STUDY MANAGEMENT

The estimated cost described  below  specifies  Covance's  fixed fees and out of
pocket  expenses.  Any deviations in the assumptions  described in this Time and
Cost Estimation,  which are out of Covance's control, or changes in the scope of
the study  will be  discussed  with Vion  Pharmaceuticals  Inc and any  required
additional  work for this study will not be  performed  by Covance  without  the
signature of Vion Pharmaceuticals Inc on the respective change order.

<TABLE>
<CAPTION>
V    STUDY SYNOPSIS AND TIMELINES

<S>                          <C>                                  <C>
- ---------------------------- ========================================================================
   Sponsor                       Vion Pharmaceuticals Inc
- ---------------------------- ========================================================================
   Drug                          Porfiromycin
- ---------------------------- ========================================================================
   Indication                    Head and Neck Cancer
- ---------------------------- ========================================================================
   Design                        Phase III, Double-blind, Randomised, Placebo-controlled
- ---------------------------- ========================================================================
   Sites                                       []                                   []
- ---------------------------- ==================================== ===================================
   Countries                     UK, France, Belgium, Germany,               North America
                                            Spain
- ---------------------------- ==================================== ===================================
   Recruited Patients                          []                                   []
- ---------------------------- ==================================== ===================================
</TABLE>



<TABLE>
<CAPTION>
- ------------------------------------- --------------------------- ===================================
                 TASK                             EUROPE                       NORTH AMERICA
- ------------------------------------- --------------------------- ===================================
<S>                                   <C>                         <C>
   Agreement Reached                       []                          []
- ------------------------------------- --------------------------- ===================================
   Final Protocol Available                []                          []
- ------------------------------------- --------------------------- ===================================
   Site Initiations Commence               []                          []
- ------------------------------------- --------------------------- ===================================
   First Patient In                        []                          []
- ------------------------------------- --------------------------- ===================================
   Last Patient In                         []                          []
- ------------------------------------- --------------------------- ===================================
   Last Patient Out                        []                          []
- ------------------------------------- --------------------------- ===================================
   Clinical Trial Report To                []                          []
   Vion Pharmaceuticals Inc
- ------------------------------------- --------------------------- ===================================
</TABLE>
*  Patient  Recruitment  will  commence  when the  signed  Clinical  Development
   Agreement is received in-house at Covance.
** These timelines are assuming that there is one Ethical  Committee  Review and
that all other regulatory requirements have not been delayed.


                                       19






VI PROJECT RESPONSIBILITIES ASSESSMENT
- -------------------------------------------- --------- ===================
                       TASK                   COVANCE         VION 
                                                       PHARMACEUTICALS INC
- -------------------------------------------- --------- ===================
Overall Project Management                       []             []
Regulatory Submissions                           []             []
Protocol Review                                  []             []
CRF Development                                  []             []
Monitoring Conventions                           []             []
Laboratory Selection                             []             []
Investigator Selection                           []             []
Pre-Study Site Visits                            []             []
Investigator Budget Management                   []             []
Ethics Committee Submissions                     []             []
Drug Supply Management                           []             []
Translations                                     []             []
Investigator Meeting                             []             []
Initiation, Monitoring & Close-Out Visits        []             []
Site Audits                                      []             []
Adverse Experience Reporting                     []             []
CRF Review and Correction (in-house)             []             []
Status Reports                                   []             []
Data Management                                  []             []
Statistical Analysis                             []             []
Preparation of CTR                               []             []
Contract Management                              []             []
============================================ --------- ===================
Please note that some of the expenses  involved in the above tasks are accounted
for as out-of-pocket expenses, please see page 22


                                       20







VII.     GLOBAL COST ESTIMATION

The following estimation is for the clinical trial with study drug: Porfiromycin
in the treatment of Head and Neck Cancer. The study will be conducted  according
to ICH GCP Guidelines and FDA requirements as appropriate.
- -------------- -------------------------------------------------- ==============
                                        ACTIVITY                  ESTIMATED COST
                                                                     ((pound))
- -------------- -------------------------------------------------- ==============
PRE STUDY      IND Preparation / Maintenance / Updates                   []
               Protocol and CRF Design                                   []
               Protocol Amendments (x [])                                []
               Pre-Study Activities, including ethics submissions        []
CLINICAL PHASE Initiation Visits                                         []
               On-site Monitoring and Project Support Services           []
               Project Management                                        []
               Site Audits                                               []
               Expeditable Adverse Experience Reporting                  []
               Site Management                                           []
               Drug Supply Management *                                  []
               IVRS                                                      []
POST STUDY     In-house Data Query Resolution                            []
               Data Management                                           []
               Statistical Analysis & Programming                        []
               QA & Medical Writing                                      []
               Contract Management                                       []
============== ================================================== ==============
                                          TOTAL                          []
============== ================================================== ==============
                        Exchange Rate: [] ($ to (pound))
*  Drug Supply  Management,  excluding  packaging and  distribution  (Allentown,
   Horsham,  Tailleur ) will be regarded as Out of Pocket costs directly  passed
   through to the client.

                                       21






                              GLOBAL VION PROGRAMME
VIII. CLINICAL AND BIOSTATISTICAL ASSUMPTIONS

====================================== -------------- =====================
                                           EUROPE         NORTH AMERICA
                                       -------------- =====================
   No. of Patients                          [ ]                [ ]

   No. of Sites                             [ ]                [ ]

   Countries                                [ ]                [ ]

   No. of CRF Pages                         [ ]                [ ]

   No. of Pre-Study Visits                  [ ]                [ ]

   No. of Initiation Visits                 [ ]                [ ]

   Monitoring Frequency                     [ ]                [ ]
                                            [ ]                [ ]
                                            [ ]                [ ]
                                                               [ ]


   No. of Routine Monitoring Visits         [ ]                [ ]


   Frequency of SAEs / patient              [ ]                [ ]

   No. of  Covance QA Field Audits          [ ]                [ ]

   Number of  clinical personnel            [ ]                [ ]
   involved                                 [ ]                [ ]
                                            [ ]
                                            [ ]


   Number of biostatistical                 [ ]
   personnel involved                       [ ]
                                            [ ]
                                            [ ]
                                            [ ]

====================================== -------------- =====================

The costs that are illustrated in the Global Cost  Estimation  (Section VII) for
this frequency of  Expeditable  Adverse  Experiences  per patient is the maximum
cost that could be incurred for this particular task in this trial.  Any changes
that  are made in the  assumptions  above  along  with  any  alterations  in the
timelines during the course of the trial once a clinical  development  agreement
has been signed, may result in the production of a change order form.


                                       22




IX. OUT OF POCKET STUDY COSTS

For the purpose of an estimated Total Budget figure and from experience, Covance
estimates that the total study Out of Pocket costs will summate to a figure that
is [ ]. This is based on the assumption that the following tasks may be included
in the Out of Pocket costs:

o        Investigator Fees
o        Investigator Meeting Costs
o        Ethics Committee Meeting Costs
o        Global Team Meetings
o        Patient Travel Costs
o        Travel Costs
o        Accommodation Costs
o        Clinical Personnel Daily Subsistence
o        Central Laboratory Costs
o        CRF Printing Costs
o        Courier Charges
o        Drug packaging & distribution (Horsham, Allentown and Tailleur)

It is important to note that this estimate is based on a "rule of thumb" but may
vary considerably from study to study.

Detailed estimates of expected  out-of-pocket  costs will be provided as soon as
these can be determined


                                       23






X. PAYMENT SCHEDULE
                                       [ ]




                                       24







XI. TOTAL ESTIMATED COSTS (EXCLUDING OUT-OF-POCKET EXPENSES)


================================================================================
                              ESTIMATED TOTAL COSTS
                            VION PORF-96-001 PROGRAM

================================================================================
- ---------------------------------------------------- ===========================
Category                                                          Cost ((pound))
- ---------------------------------------------------- ===========================
Covance Clinical Fees                                                       [ ]

- ---------------------------------------------------- ===========================
- ---------------------------------------------------- ===========================
Covance Biostatistical and Report Writing Fees                              [ ]
- ---------------------------------------------------- ===========================
- ---------------------------------------------------- ===========================
Covance Regulatory Fees                                                     [ ]
- ---------------------------------------------------- ===========================
- ---------------------------------------------------- ===========================
Total                                                                       [ ]

- ---------------------------------------------------- ===========================
- ---------------------------------------------------- ===========================
OUT-OF POCKETS                                                    To be Advised
- ---------------------------------------------------- ===========================


XII. SUMMARY AND CONCLUSIONS

     o   Time and Cost  Estimates  for the  conduct  of this  program  have been
         presented.

     o   Many  aspects  of  the  tasks  and   responsibilities   are  undergoing
         discussion and finalisation (e.g.,  Investigator  Selection,  etc.). As
         with other projects Covance encourages  frequent and open communication
         with Vion  Pharmaceuticals  during the planning  process and throughout
         the conduct of this study.


                                       25



ATTACHMENT I
                                       [ ]





                                       26



<TABLE> <S> <C>


<ARTICLE>                     5
       
<S>                             <C>
<PERIOD-TYPE>                   6-Mos
<FISCAL-YEAR-END>                              Dec-31-1997
<PERIOD-START>                                 Jan-01-1997
<PERIOD-END>                                   Jun-30-1997
<CASH>                                         4,352,877
<SECURITIES>                                   329,200
<RECEIVABLES>                                  0
<ALLOWANCES>                                   0
<INVENTORY>                                    0
<CURRENT-ASSETS>                               4,772,822
<PP&E>                                         933,461
<DEPRECIATION>                                 0
<TOTAL-ASSETS>                                 6,158,122
<CURRENT-LIABILITIES>                          1,886,571
<BONDS>                                        0
                          0
                                    9,794
<COMMON>                                       84,892
<OTHER-SE>                                     3,871,836
<TOTAL-LIABILITY-AND-EQUITY>                   6,158,122
<SALES>                                        0
<TOTAL-REVENUES>                               48,221
<CGS>                                          0
<TOTAL-COSTS>                                  0
<OTHER-EXPENSES>                               5,377,228
<LOSS-PROVISION>                               0
<INTEREST-EXPENSE>                             21,802
<INCOME-PRETAX>                                (5,172,780)
<INCOME-TAX>                                   0
<INCOME-CONTINUING>                            (5,172,780)
<DISCONTINUED>                                 0
<EXTRAORDINARY>                                0
<CHANGES>                                      0
<NET-INCOME>                                   (5,172,780)
<EPS-PRIMARY>                                  (.60)
<EPS-DILUTED>                                  (.60)
        


</TABLE>


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