ARONEX PHARMACEUTICALS INC
10-Q, 1998-08-14
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ----------------
                                    FORM 10-Q
(Mark One)
    (X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
                           For the Quarterly Period Ended June 30, 1998
                                                        OR
    (  ) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934
              For the transition period from _________ to _________
                           Commission File No. 0-20111
                          ARONEX PHARMACEUTICALS, INC.
             (Exact name of Registrant as specified in its charter)

               Delaware                                  76-0196535
    (State or other jurisdiction            (I.R.S. Employer Identification No.)
  of incorporation or organization)
          8707 Technology Forest Drive, The Woodlands, Texas 77381-1191
              (Address of principal executive offices and Zip Code)
       Registrant's telephone number, including area code: (281) 367-1666

         Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
Registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days. Yes (X) No( )

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

               Class                                Outstanding at June 30, 1998
  Common Stock, $.001 par value                           15,497,443 shares

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<PAGE>





                          ARONEX PHARMACEUTICALS, INC.
                         Quarterly Period June 30, 1998
<TABLE>

<CAPTION>
                                      INDEX
                                                                            Page

<S>                                                                          <C>
FACTORS AFFECTING FORWARD LOOKING STATEMENTS................................   3

PART I.           Financial Information

Item 1   Financial Statements...............................................   3

         Balance Sheets - December 31, 1997 and June 30, 1998 (unaudited)...   4

         Statements of Operations:
           Six Months Ended June 30, 1997 and June 30, 1998  
           (unaudited) and for the Period from Inception (June 13, 1986)
           through June 30, 1998 (unaudited)................................   5

         Statements of Cash Flows:
           Six Months Ended June 30, 1997 and June 30, 1998  
           (unaudited) and for the Period from Inception (June 13, 1986)
           through June 30, 1998 (unaudited)................................   6

         Notes to Financial Statements - June 30, 1998......................   7

Item 2   Management's Discussion and Analysis of Financial
           Condition and Results of Operations..............................   9


PART II.           Other Information

Item 4   Submission of Matters to Vote of Security Holders..................  12

Item 6   Exhibits and Reports on Form 8-K...................................  13


SIGNATURES        ..........................................................  14

</TABLE>





                                      - 2-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)

                  FACTORS AFFECTING FORWARD-LOOKING STATEMENTS

         This   Quarterly   Report  on  Form  10-Q   includes   "forward-looking
statements"  within the meaning of Section 27A of the Securities Act of 1933, as
amended, and Section 21E of the Securities Exchange Act of 1934, as amended. The
words  "anticipate,"  "believe,"  "expect,"  "estimate,"  "project"  and similar
expressions are intended to identify forward-looking statements. Such statements
are subject to certain risks, uncertainties and assumptions.  Should one or more
of these risks or uncertainties  materialize,  or should underlying  assumptions
prove  incorrect,  actual results may vary  materially  from those  anticipated,
believed,  expected,  estimated or projected.  For additional discussion of such
risks,  uncertainties and assumptions,  see "Item 1. Business -- Manufacturing,"
"-- Sales and  Marketing,"  "-- Patents,  Proprietary  Rights and Licenses," "--
Government  Regulation,"  "--  Competition"  and "-- Additional  Business Risks"
included in the Company's Annual Report on Form 10-K for the year ended December
31,  1997,  and "Item 2.  Management's  Discussion  and  Analysis  of  Financial
Condition and Results of  Operations"  and "-- Liquidity and Capital  Resources"
included elsewhere in this report.

PART I.       FINANCIAL INFORMATION

Item 1.       Financial Statements

     The following unaudited financial statements have been prepared pursuant to
the rules and  regulations of the Securities  and Exchange  Commission.  Certain
information  and  note  disclosures   normally   included  in  annual  financial
statements prepared in accordance with generally accepted accounting  principles
have been condensed or omitted pursuant to those rules and regulations, although
the Company  believes that the disclosures  made herein are adequate to make the
information presented not misleading.  These financial statements should be read
in  conjunction  with the financial  statements  for the year ended December 31,
1997  included in the  Company's  Annual  Report on Form 10-K for the year ended
December  31,  1997,  filed  pursuant  to Section 13 or 15(d) of the  Securities
Exchange Act of 1934.

     The  information  presented in the  accompanying  financial  statements  is
unaudited,  but in the opinion of management,  reflects all  adjustments  (which
include only normal  recurring  adjustments)  necessary  to present  fairly such
information.




                                      - 3-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)

                                 BALANCE SHEETS
                  (All amounts in thousands, except share data)

<TABLE>
<CAPTION>

                                     ASSETS
                                                                                                         June 30,
                                                                                   December 31,            1998
                                                                                       1997             (Unaudited)
<S>                                                                            <C>                  <C>          

Current Assets:
   Cash and cash equivalents.............................................      $         2,029      $       6,265
   Short-term investments................................................               17,783             13,457
   Accounts receivable...................................................                  100                 --
   Prepaid expenses and other assets.....................................                  474                774
                                                                               ---------------      -------------
        Total current assets.............................................               20,386             20,496

Long-term investments....................................................               10,142              1,509
Furniture, equipment and leasehold improvements, net                                     1,107              2,161
Deposits.................................................................                  490                 --
                                                                               ---------------      -------------
        Total assets.....................................................      $        32,125      $      24,166
                                                                               ===============      =============

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable and accrued expenses.................................      $         1,977      $       2,786
   Accrued payroll.......................................................                  554                822
   Advance from Genzyme..................................................                2,000              2,000
   Current portion of notes payable......................................                  191                218
   Current portion of obligations under capital leases...................                   18                 16
                                                                               ---------------      -------------
        Total current liabilities........................................                4,740              5,842

Long-term obligations:
   Notes payable, net of current portion.................................                   --              1,097
   Obligations under capital leases, net of current portion..............                    6                 --
                                                                               ---------------      -------------
        Total long-term obligations......................................                    6              1,097

Commitments and contingencies

Stockholders' equity:
   Preferred stock $.001 par value, 5,000,000 shares authorized,
        none issued and outstanding......................................                 --                   --
   Common stock $.001 par value, 30,000,000 shares authorized,
        14,597,247 and 15,497,443 shares issued and outstanding,
        respectively.....................................................                   15                 15
   Additional paid-in capital............................................               96,606             97,635
   Common stock warrants.................................................                  967                 50
   Treasury stock........................................................                  (11)               (11)
   Deferred compensation.................................................                 (907)              (684)
   Unrealized loss on investments.......................................                   (87)               (87)
   Deficit accumulated during development stage..........................              (69,204)           (79,691)
                                                                               ---------------      -------------
        Total stockholders' equity......................................                27,379             17,227
                                                                               ---------------      -------------
   Total liabilities and stockholders' equity...........................       $        32,125      $      24,166
                                                                               ===============      =============
</TABLE>

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

                                      - 4-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)


                            STATEMENTS OF OPERATIONS
             (All amounts in thousands, except loss per share data)
                                   (Unaudited)

<TABLE>
<CAPTION>





                                                                                                            
                                                                                                           Period
                                                                                                            from
                                                                                                          Inception
                                                                                                          (June 13,
                                                    Six Months Ended             Three Months Ended         1986)
                                                        June 30,                      June 30,             through
                                                                                                           June 30,         
                                                  1997           1998           1997           1998         1998
                                             ---------      ----------      ---------      ---------     ---------- 
<S>                                          <C>            <C>             <C>            <C>           <C>       
 
Revenues:
    Interest income....................      $   1,123      $      748      $     531      $     331     $    6,329
     Research and development
         grants and contracts...........           316             193             30             90          5,243
                                             ---------      ----------      ---------      ---------     ----------
              Total revenues............         1,439             941            561            421         11,572

Expenses:
     Research and development...........         6,652           9,867          3,167          5,345         63,002
     Purchase of in-process
         research and development.......            --              --             --             --         11,625
     General and administrative.........           931           1,547            475            643         15,351
     Interest expense and other.........           150              14            120              9          1,285
                                             ---------      ----------      ---------      ---------     ----------
              Total expenses............         7,733          11,428          3,762          5,997         91,263
                                             ---------      ----------      ---------      ---------     ----------
Net loss................................     $  (6,294)     $  (10,487)     $  (3,201)     $  (5,576)    $  (79,691)
                                             ---------      ==========      ---------      =========     ==========

Basic and diluted loss per share........     $   (0.43)     $    (0.68)     $   (0.22)     $   (0.36)
                                                 =====           =====          =====          =====
Weighted average shares used in
     computing basic and diluted loss
     per share..........................        14,646          15,464         14,671         15,468

</TABLE>












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

                                      - 5-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)

                            STATEMENTS OF CASH FLOWS
                           (All amounts in thousands)
                                   (Unaudited)
<TABLE>
<CAPTION>

                                                                                                                   Period from
                                                                                                                    Inception
                                                                                                                 (June 13, 1986)
                                                                                       Six Months Ended              through
                                                                                           June 30,                  June 30,
                                                                                    1997              1998             1998
                                                                                ---------        ----------        -----------   
                                                                             
<S>                                                                           <C>               <C>               <C>           
 
Cash flows from operating activities:
  Net loss. . . . . . ................................................          $  (6,294)       $  (10,487)       $   (79,691)

   Adjustments to reconcile net loss to net cash provided by
     (used in) operating activities--
        Depreciation and amortization..................................               475               360              4,386
        Loss (gain) on disposal of assets..............................               107               (2)                198
        Compensation expense related to stock and stock options........               315               268              3,504
        Charge for purchase of in-process research and development.....                --                --             11,547
        Unrealized loss on investment .................................               (31)               --                (87)
        Acquisition costs, net of cash received........................                --                --               (270)
        Loss in affiliate..............................................                --                --                500
        Changes in assets and liabilities:
           Increase in prepaid expenses and other assets...............              (178)             (300)              (589)
           Decrease in accounts receivable.............................                78               100                 --
           Increase (decrease) in accounts payable and accrued
                   expenses............................................               (63)            1,077              3,535
           Increase in deferred revenue................................                --                --               (353)
        Accrued interest payable converted to stock....................                --                --                 97
                                                                                ---------         ---------        ----------- 
                  Net cash used in operating activities................            (5,591)           (8,984)           (57,223)
                                                                                ---------         ---------        ----------- 
Cash flows from investing activities:
   Net sales (purchases) of investments................................              7,976           12,959             (9,231)
   Purchase of furniture, equipment and leasehold improvements.........               (206)          (1,421)            (5,542)
   Proceeds from sale of assets........................................                 34                9                 63
   Decrease (increase) in deposits.....................................               (147)             490                 --
   Investment in affiliate.............................................                 --               --               (500)
                                                                              
                  Net cash provided by (used in) investing activities..              7,657           12,037            (15,210)
Cash flows from financing activities:
   Proceeds from notes payable and capital leases......................                 --            1,369              6,041
   Repayment of notes payable and principal payments under capital
     lease obligations.................................................               (155)            (254)            (2,712)
   Purchase of treasury stock..........................................                 --               --                (11)
   Proceeds from issuance of stock.....................................                143               68             75,380
                                                                                ----------        ---------        ----------- 
                 Net cash provided by (used in) financing activities ..                (12)           1,183             78,698
                                                                                ----------        ---------        -----------    
                                                                              
Net increase in cash and cash equivalents..............................              2,054            4,236              6,265
Cash and cash equivalents at beginning of period.......................              4,179            2,029                 --
                                                                                ----------        ---------        ----------- 
                                                                              

Cash and cash equivalents at end of period.............................         $    6,233        $   6,265        $     6,265
                                                                                ==========        =========        ===========
                                                                              

Supplemental disclosures of cash flow information:
   Cash paid during the period for interest............................         $       43        $      14        $       799
Supplemental schedule of noncash financing activities:
   Conversion of notes payable and accrued interest to common stock             $       --        $      --        $     3,043
</TABLE> 

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


                                      - 6-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)

                          NOTES TO FINANCIAL STATEMENTS
                                  June 30, 1998
                                   (Unaudited)

1.   Organization and Basis of Presentation

     Aronex  Pharmaceuticals,  Inc. ("Aronex  Pharmaceuticals" or the "Company")
was  incorporated  in  Delaware  on  June  13,  1986  and  merged  with  Triplex
Pharmaceutical   Corporation  ("Triplex")  and  Oncologix,   Inc.  ("Oncologix")
effective September 11, 1995 ("Merger"). Aronex Pharmaceuticals is a development
stage company which has devoted substantially all of its efforts to research and
product development and has not yet generated any significant  revenues,  nor is
there any assurance of significant  future  revenues.  In addition,  the Company
expects to continue to incur losses for the foreseeable  future and there can be
no assurance  that the Company will complete the  transition  from a development
stage company to successful operations.  The research and development activities
engaged in by the  Company  involve a high degree of risk and  uncertainty.  The
ability  of the  Company to  successfully  develop,  manufacture  and market its
proprietary products is dependent upon many factors.  These factors include, but
are not limited to, the need for additional financing,  attracting and retaining
key personnel and consultants, and successfully developing manufacturing,  sales
and marketing operations.  The Company's ability to develop these operations may
be impacted by  uncertainties  related to patents and proprietary  technologies,
technological  change  and  obsolescence,   product  development,   competition,
government   regulations  and  approvals,   health  care  reform,   third  party
reimbursement  and  product  liability  exposure.  Additionally,  the Company is
reliant upon  collaborative  arrangements for research,  contractual  agreements
with corporate partners, and its exclusive license agreements with M.D. Anderson
Cancer Center ("MD  Anderson").  Further,  during the period required to develop
its  products,  the  Company  will  require  additional  funds  which may not be
available to it. The Company  expects that its existing cash  resources  will be
sufficient to fund its cash requirements  through mid-1999.  Accordingly,  there
can be no assurance of the Company's future success.

     The balance sheet at June 30, 1998 and the related statements of operations
and cash flows for the six month  periods  ending June 30, 1998 and 1997 and the
period from inception (June 13, 1986) through June 30, 1998 are unaudited. These
interim financial statements should be read in conjunction with the December 31,
1997 financial  statements and related notes.  The unaudited  interim  financial
statements  reflect all  adjustments  which are,  in the opinion of  management,
necessary for a fair statement of results for the interim periods  presented and
all such adjustments are of a normal recurring  nature.  Interim results are not
necessarily indicative of results for a full year.

2.   Accounting Policies

     The Company has adopted Statement of Financial Accounting Standards No. 130
("SFAS 130"), Reporting Comprehensive Income. SFAS 130 requires the reporting of
comprehensive  income in addition to net income from  operations.  Comprehensive
income  is a  more  inclusive  financial  reporting  methodology  that  includes
disclosure  of certain  financial  information  that  historically  has not been
recognized in the  calculation  of net income.  Comprehensive  income (loss) was
$(6,325,000) and  $(10,487,000) for the six months ended June 30, 1997 and 1998,
respectively.

3.   Cash, Cash Equivalents and Investments

     Cash and cash  equivalents  include money market  accounts and  investments
with an  original  maturity of less than three  months.  At June 30,  1998,  all
short-term  investments are held to maturity securities consisting of high-grade
commercial paper and United States  Government backed securities with a carrying
value of $13,457,000,  which approximates fair market value and cost.  Long-term
investments at June 30, 1998 are available for sale securities  which are United
States  mortgage  backed  securities  with various  maturity dates over the next
several years that have an amortized cost of $1,596,000,  a fair market value of
$1,509,000 and a gross  unrealized loss of $87,000 at June 30, 1998. The Company
currently has no trading securities.


                                      - 7-

<PAGE>


                          ARONEX PHARMACEUTICALS, INC.
                          (A development stage company)


                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)

4.   Federal Income Taxes

     At  December  31,  1997,   the  Company  had  net  operating  loss  ("NOL")
carryforwards  for federal income tax purposes of  approximately  $79.0 million.
The Tax  Reform  Act of 1986  provided  a  limitation  on the use of NOL and tax
credit  carryforwards  following  certain ownership changes that could limit the
Company's  ability  to  utilize  these NOLs and tax  credits.  Accordingly,  the
Company's  ability to utilize  its NOLs and tax credit  carryforwards  to reduce
future taxable  income and tax  liabilities  may be limited.  As a result of the
Merger  with  Triplex and  Oncologix,  a change in control as defined by federal
income tax law occurred,  causing the use of these  carryforwards  to be limited
and possibly  eliminated.  Additionally because United States tax laws limit the
time during which NOLs and the tax credit  carryforwards  may be applied against
future taxable income and tax  liabilities,  the Company may not be able to take
full advantage of its NOLs and tax credit  carryforwards  for federal income tax
purposes.  The carryforwards will begin to expire in 2001 if not otherwise used.
Due to the possibility of not reaching a level of profitability  that will allow
for the utilization of the Company's deferred tax assets, a valuation  allowance
has been  established  to offset these tax assets.  The Company has not made any
income tax payments since inception.



                                      - 8-

<PAGE>
     Item 2.  Management's  Discussion  and Analysis of Financial  Condition and
Results of Operations

Results of Operations

     Overview

     Since  its  inception  in  1986,  Aronex  Pharmaceuticals,   Inc.  ("Aronex
Pharmaceuticals"  or the "Company") has primarily  devoted its resources to fund
research,  drug discovery and development.  The Company has been unprofitable to
date and  expects to incur  substantial  operating  losses for the next  several
years  as it  expends  its  resources  for  product  research  and  development,
preclinical  and clinical  testing and  regulatory  compliance.  The Company has
sustained  losses of  approximately  $79.7  million  through June 30, 1998.  The
Company has  financed its research and  development  activities  and  operations
primarily  through  public and private  offerings of  securities.  The Company's
operating  results have fluctuated  significantly  during each quarter,  and the
Company  anticipates  that such  fluctuations,  largely  attributable to varying
commitments and  expenditures  for clinical trials and research and development,
will continue for the next several years.

     Three and Six Month Periods Ended June 30, 1997 and 1998

     Interest  income was  $331,000 and $531,000 for the three months ended June
30, 1998 and 1997,  respectively,  a decrease of $200,000.  Interest  income was
$748,000  and  $1,123,000  for the six  months  ended  June 30,  1998 and  1997,
respectively,  a decrease of $375,000.  These  decreases were primarily due to a
decrease of funds available for investment.

     Revenues from research and  development  grants and contracts  were $90,000
and $30,000 for the three months ended June 30, 1998 and 1997, respectively,  an
increase of $60,000. Research and development grants and contracts were $193,000
and $316,000 for the six months  ended June 30, 1998 and 1997,  respectively,  a
decrease of  $123,000.  For the six months  ended June 30,  1997,  research  and
development  revenue was composed of (i) $150,000 in revenue from the initiation
of a license  agreement  with  Boehringer  Mannheim  GmbH and (ii)  $166,000  in
development  revenue from  Targeted  Genetics,  Incorporated  ("Targeted").  The
three-year agreement with Targeted ended in the second quarter of 1997. Research
and development  revenue for the six months ended June 30, 1998 represents Small
Business   Innovative   Grant  Research   ("SBIR")  grant  revenue  relating  to
ZintevirTM.

     Research and  development  expenses were  $5,345,000 and $3,167,000 for the
three  months  ended  June 30,  1998 and  1997,  respectively,  an  increase  of
$2,178,000. Research and development expenses were $9,867,000 and $6,652,000 for
the six months  ended  June 30,  1998 and 1997,  respectively,  an  increase  of
$3,215,000.  These  increases  were primarily due to increases of $1,675,000 and
$2,810,000  in clinical  investigation  costs for the three and six months ended
June 30,  1998,  respectively.  The  majority of these costs  relate to clinical
trials of the Company's lead products,  NYOTRANTM and ATRAGEN(R).  The increases
in research and  development  expenses  also  reflect  increases of $456,000 and
$626,000 in medical  affairs and  regulatory  salaries and payroll costs for the
three  and six  months  ended  June 30,  1998,  respectively,  as the  number of
personnel in these departments increased  significantly from the same periods in
1997.  These  increases  were  partially  offset by  decreases  of $324,000  and
$648,000 in internal  research  expenses for the three and six months ended June
30,  1998 as a  result  of the  elimination  of the  majority  of the  Company's
internal research efforts in the second quarter of 1997.

                                      -9-
<PAGE>
     General and  administrative  expenses  were  $643,000  and $475,000 for the
three  months  ended  June 30,  1998 and  1997,  respectively,  an  increase  of
$168,000.  General and administrative  expenses were $1,547,000 and $931,000 for
the six months  ended  June 30,  1998 and 1997,  respectively,  an  increase  of
$616,000.  These  increases  were primarily due to (i) increases of $121,000 and
$506,000 in salaries and payroll costs; (ii) increases of $29,000 and $60,000 in
business  travel relating  mainly to business  development  activities and (iii)
increases of $53,000 and $25,000 in investor and public  relations  expenses for
the three and six month periods ended June 30, 1998,  respectively.  Several new
positions have been added since the first quarter of 1997 and a Chief  Executive
Officer was added in the fourth  quarter of 1997.  Additionally,  the  Company's
President,  who  resigned in January  1998,  is  entitled  to certain  severance
payments in accordance  with a  termination  and  severance  agreement  with the
Company.  These severance  payments,  which continue  through January 1999, were
recorded as compensation expense in the first quarter of 1998.
                                      
     Interest  expense and other was $9,000 and  $120,000  for the three  months
ended June 30, 1998 and 1997,  respectively,  a decrease of  $111,000.  Interest
expense  and other was $14,000 and  $150,000  for the six months  ended June 30,
1998 and 1997, respectively, a decrease of $136,000. These decreases in interest
expense and other  resulted  primarily  from a loss on disposal of equipment and
leasehold  improvements of $107,000 in the quarter ended June 30, 1997 that were
formerly used in  now-discontinued  research  activities.  These  decreases were
partially  offset by a decrease in interest expense as a result of a decrease in
the average amount of outstanding debt relating to laboratory equipment obtained
through leases and loans.

     Net loss was  $5,576,000 and $3,201,000 for the three months ended June 30,
1998 and 1997,  respectively,  an increase of  $2,375,000.  Net loss for the six
months  ended  June  30,  1998  and  1997,  respectively,  was  $10,487,000  and
$6,294,000, an increase of $4,193,000. These increases were primarily due to the
increase in research and development expenses.

Liquidity and Capital Resources

     Since its  inception,  the Company's  primary  source of cash has been from
financing  activities,  which  have  consisted  primarily  of  sales  of  equity
securities.  The Company has raised an  aggregate of  approximately  $75 million
from the sale of equity  securities from its inception through June 30, 1998. In
July 1992, the Company raised net proceeds of approximately $10.7 million in the
initial  public  offering of its Common Stock.  In September  1993,  the Company
entered into a  collaborative  agreement  with Genzyme  Corporation  ("Genzyme")
relating to the development and  commercialization of ATRAGEN(R),  in connection
with which the Company received net proceeds of approximately  $4.5 million from
the sale of Common Stock to Genzyme.  In November 1993 and May 1996, the Company
raised net proceeds of approximately $11.5 and $32.1 million,  respectively,  in
public  offerings of Common Stock.  From October 1995 through June 30, 1998, the
Company received  aggregate net proceeds of approximately  $6.5 million from the
exercise of certain warrants issued in its 1995 merger with Oncologix.  From its
inception  until June 30, 1998,  the Company also  received an aggregate of $4.9
million cash from collaborative arrangements and SBIR grants.

     The Company's primary use of cash to date has been in operating  activities
to fund research and  development,  including  preclinical  studies and clinical
trials, and general and administrative  expenses.  Cash of $8.9 million and $5.6
million was used in operating activities during the first six months of 1998 and
1997,  respectively.  The Company had cash,  cash-equivalents and short-term and
long-term investments of $21.2 million as of June 30, 1998, consisting primarily
of cash and money market accounts,  and United States government  securities and
investment grade commercial paper.

     The Company has experienced  negative cash flows from operations  since its
inception  and  has  funded  its   activities  to  date  primarily  from  equity
financings. The Company has expended, and will continue to require,  substantial
funds to continue research and development,  including  preclinical  studies and
clinical trials of its products,  and to commence sales and marketing efforts if
Food and Drug  Administration and other regulatory  approvals are obtained.  The
Company expects that its existing  capital  resources will be sufficient to fund
its capital requirements through mid- 1999. Thereafter, the Company will need to
raise  substantial  additional  capital to fund its  operations.  The  Company's
capital  requirements  will  depend on many  factors,  including  the  problems,
delays,  expenses and complications  frequently encountered by development stage
companies;  the progress of the  Company's  research,  development  and clinical

                                      - 10-
<PAGE>

trial  programs;  the  extent and terms of any  future  collaborative  research,
manufacturing,  marketing or other funding arrangements; the costs and timing of
seeking regulatory approvals of the Company's products; the Company's ability to
obtain  regulatory  approvals;  the success of the Company's sales and marketing
programs;  costs of filing,  prosecuting  and defending and enforcing any patent
claims  and  other  intellectual  property  rights;  and  changes  in  economic,
regulatory  or  competitive   conditions  of  the  Company's  planned  business.
Estimates  about the adequacy of funding for the Company's  activities are based
on certain  assumptions,  including the  assumption  that testing and regulatory
procedures  relating to the  Company's  products  can be  conducted at projected
costs.  There can be no  assurance  that changes in the  Company's  research and
development plans, acquisitions,  or other events will not result in accelerated
or unexpected expenditures. To satisfy its capital requirements, the Company may
seek to raise  additional  funds in the public or private capital  markets.  The
Company's  ability to raise  additional  funds in the public or private  markets
will be  adversely  affected if the  results of its  current or future  clinical
trials are not  favorable.  The  Company  may seek  additional  funding  through
corporate collaborations and other financing vehicles. There can be no assurance
that any such funding will be available to the Company on favorable  terms or at
all. If adequate funds are not available, the Company may be required to curtail
significantly one or more of its research or development  programs, or it may be
required to obtain funds through arrangements with future collaborative partners
or others that may require  the Company to  relinquish  rights to some or all of
its  technologies  or  products.  If the  Company  is  successful  in  obtaining
additional  financing,  the  terms of such  financing  may have  the  effect  of
diluting or adversely affecting the holdings or the rights of the holders of the
Company's Common Stock.


      Year 200

     Year 2000 issues result from the inability of certain computer  programs or
computerized  equipment to accurately calculate,  store or use a date subsequent
to December 31,  1999.  The  erroneous  date can be  interpreted  in a number of
different  ways;  typically the year 2000 is represented as the year 1900.  This
could  result in a system  failure or  miscalculations  causing  disruptions  of
operations,  including,  among other  things,  a temporary  inability to process
transactions, send invoices or engage in similar normal business.

     The Company is in the process of assessing all  financial  and  operational
systems and equipment to ensure year 2000 compliance,  and plans to complete the
assessment  by  December  31,  1998.  Based on reviews  to date and  preliminary
information,  the Company does not anticipate that it will incur any significant
costs  relating to the  assessment  and  remediation  of year 2000  issues.  The
Company  believes  that the potential  impact,  if any, of its systems not being
year 2000  compliant  should not impact the  Company's  ability to continue  its
research and development activities. However, there can be no assurance that the
Company,  its business partners,  vendors or customers will successfully be able
to identify and remedy all potential year 2000 problems or that a system failure
resulting from a failure to identify any such problems would not have a material
adverse effect on the Company.


                                      - 11-

<PAGE>



PART II.          OTHER INFORMATION

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

     The Annual Meeting of the Stockholders of Aronex Pharmaceuticals,  Inc. was
held on June 11, 1998 to consider and vote upon the following proposals:

(i)  Election of Class I Directors. The following individuals were nominated and
     elected as Class I directors,  with the  following  numbers of shares voted
     for and against and withheld for each director:
<TABLE>
<CAPTION>

                                                                       For                     Withheld
<S>                                                                <C>                               <C>    
                    Ronald J. Brenner, Ph.D.                       13,615,107                   168,212
                    Martin P. Sutter                               13,744,518                    38,801

                                                                      For          Against       Abstain
(ii) Approval and adoption of 1998 Stock Option Plan               11,376,223     2,291,320      49,623

(iii) Ratification and approval of Arthur Andersen LLP
     as independent public accountants                             13,711,914     51,431         19,974
</TABLE>




                                                      - 12-

<PAGE>



Item 6.    Exhibits and Reports on Form 8-K

   (a) Exhibits

          10.1 Aronex Pharmaceuticals, Inc. 1998 Stock Option Plan.

          10.2 Employment  Agreement dated June 12, 1998 between the Company and
               Praveen Tyle, Ph.D.

          10.3 Employment  Agreement  dated June 12,1998 between the Company and
               Paul A. Cossum, Ph.D.

          10.4 Employment  Agreement dated June 12, 1998 between the Company and
               Terance A. Murnane.

          11.1 Statement regarding computation of per share earnings.

          27.1 Financial data schedule.

   (b) Reports on Form 8-K

       None


                                      - 13-

<PAGE>





                                   SIGNATURES

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



                                                    ARONEX PHARMACEUTICALS, INC.




Dated:     August 12, 1998                          By:/S/GEOFFREY F. COX
                                                       ------------------
                                                    Geoffrey F. Cox, Ph.D.
                                                    Chief Executive Officer







Dated:     August 12, 1998                          By:/S/TERANCE A. MURNANE
                                                       ---------------------
                                                    Terance A. Murnane
                                                    Controller
 
                                     - 14-

                          ARONEX PHARMACEUTICALS, INC.
                             1998 STOCK OPTION PLAN

                                    ARTICLE I

                                      PLAN

     1.1  PURPOSE.  This Plan is a plan for  employees  and  consultants  of the
Company and its  Affiliates and is intended to advance the best interests of the
Company,  its  Affiliates,  and its  stockholders by providing those persons who
have substantial responsibility for the management and growth of the Company and
its  Affiliates  with  additional  incentives  and an  opportunity  to obtain or
increase their proprietary interest in the Company,  thereby encouraging them to
continue in the employ of the Company or any of its Affiliates.

     1.2  EFFECTIVE  DATE OF PLAN.  This Plan shall be effective  March 19, 1998
(the  "Effective  Date"),  if within  one year of that  date it shall  have been
approved  by at least a  majority  vote of  stockholders  voting in person or by
proxy  at a  duly  held  stockholders'  meeting,  or if  the  provisions  of the
corporate  charter,  by-laws or applicable state law prescribes a greater degree
of  stockholder  approval for this  action,  the approval by the holders of that
percentage,  at a duly held meeting of stockholders.  No Option shall be granted
pursuant to this Plan after March 19, 2008.


                                   ARTICLE II

                                   DEFINITIONS

     The words and phrases  defined in this  Article  shall have the meaning set
out in these  definitions  throughout this Plan, unless the context in which any
such  word or  phrase  appears  reasonably  requires  a  broader,  narrower,  or
different meaning.

     2.1   "AFFILIATE"   means  any  parent   corporation   and  any  subsidiary
corporation. The term "parent corporation" means any corporation (other than the
Company) in an unbroken chain of corporations ending with the Company if, at the
time of the  action or  transaction,  each of the  corporations  other  than the
Company owns stock  possessing 50% or more of the total combined voting power of
all  classes of stock in one of the other  corporations  in the chain.  The term
"subsidiary  corporation"  means any corporation  (other than the Company) in an
unbroken chain of corporations beginning with the Company if, at the time of the
action or transaction,  each of the corporations other than the last corporation
in the unbroken  chain owns stock  possessing  50% or more of the total combined
voting  power of all  classes of stock in one of the other  corporations  in the
chain.

     2.2 "BOARD OF DIRECTORS" means the board of directors of the Company.

     2.3 "CAUSE," when used in connection  with the termination of an Employee's
employment or  Consultant's  engagement  by the Company,  means (i) any material
failure of the Employee or Consultant to perform his duties under any employment
or consulting  agreement with the Company (other than any such failure resulting
from the Employee or Consultant's incapacity due to Disability),  subject to any
written  notice and  opportunity  to cure  provided  for by such  employment  or
consulting  agreement,  (ii) the Employee or  Consultant's  gross  negligence or
willful or  intentional  wrongdoing or misconduct  relating to his employment or
engagement by the Company, (iii) a material breach by the Employee or Consultant
of any proprietary information,  inventions or non-competition agreement between
the  Employee  or  Consultant  and the  Company,  (iv) a material  breach by the
Employee or Consultant of any insider trading, business ethics or similar policy
of the Company,  or (iv)  conviction  of the Employee or  Consultant of a felony
offense or a crime involving moral turpitude.


WOD01:4414.1
                                       -1-

<PAGE>



     2.4 "CHANGE OF CONTROL" means:

          (i) the acquisition after the Effective Date by any individual, entity
     or group  (within  the  meaning  of Section  13(d)(3)  or  14(d)(2)  of the
     Securities  Exchange Act of 1934,  as amended) (a  "Person") of  beneficial
     ownership of 30 percent or more of either (i) the then  outstanding  shares
     of common stock of the Company (the "Outstanding Common Stock") or (ii) the
     combined  voting power of the then  outstanding  voting  securities  of the
     Company  entitled  to vote  generally  in the  election of  directors  (the
     "Outstanding  Voting  Securities"),  provided  that  for  purposes  of this
     subsection (i), the following acquisitions shall not constitute a Change of
     Control: (A) any acquisition directly from the Company, (B) any acquisition
     by the  Company,  (C) any  acquisition  by any  employee  benefit  plan (or
     related  trust)  sponsored or maintained by the Company or any  corporation
     controlled  by the  Company,  or (D)  any  acquisition  by any  corporation
     pursuant to a transaction  which  complies with clauses (A), (B) and (C) of
     subsection (iii) hereof; or

          (ii) individuals,  who, as of the Effective Date, constitute the Board
     (the  "Incumbent  Board")  cease for any  reason to  constitute  at least a
     majority of the Board,  provided  that any  individual  becoming a director
     subsequent  to  the  Effective  Date  whose  nomination  or  election,   or
     nomination  for election by the Company's  stockholders,  was approved by a
     vote of at least a majority of the directors then  comprising the Incumbent
     Board shall be  considered  as though such  individual  was a member of the
     Incumbent Board, but excluding, for this purpose, any such individual whose
     initial  assumption of office occurs as a result of an actual or threatened
     election  contest  with  respect to the election or removal of directors or
     other  actual or  threatened  solicitation  of proxies or consents by or on
     behalf of a Person other than the Board; or


WOD01:4414.1
                                       -2-
<PAGE>

          (iii)  consummation  after  the  Effective  Date of a  reorganization,
     merger  or   consolidation   or  sale  or  other   disposition  of  all  or
     substantially all of the assets of the Company (a "Corporate  Transaction")
     unless, in each case, following such Corporate Transaction,  (A) (1) all or
     substantially  all of the  persons  who were the  beneficial  owners of the
     Outstanding  Common Stock immediately  prior to such Corporate  Transaction
     beneficially own, directly or indirectly,  more than 60 percent of the then
     outstanding  shares of common stock of the corporation  resulting from such
     Corporate Transaction,  and (2) all or substantially all of the persons who
     were the beneficial owners of the Outstanding Voting Securities immediately
     prior  to  such  Corporate   Transaction   beneficially   own  directly  or
     indirectly,  more than 60 percent of the combined  voting power of the then
     outstanding voting securities entitled to vote generally in the election of
     directors of the  corporation  resulting  from such  Corporate  Transaction
     (including,  without  limitation,  a corporation  which as a result of such
     transaction owns the Company or all or  substantially  all of the Company's
     assets   either   directly  or  through  one  or  more   subsidiaries)   in
     substantially  the same  proportions as their  ownership of the Outstanding
     Common Stock and the outstanding  Voting  Securities  immediately  prior to
     such Corporate  Transaction,  as the case may be, (B) no Person  (excluding
     (1) any  corporation  resulting  from  such  Corporate  Transaction  or any
     employee benefit plan (or related trust) of the Company or such corporation
     resulting from such Corporate  Transaction  and (2) any Person  approved by
     the Incumbent Board) beneficially owns, directly or indirectly,  20 percent
     or more of the then  outstanding  shares of common stock of the corporation
     resulting from such Corporate  Transaction or the combined  voting power of
     the then outstanding  voting  securities of such corporation  except to the
     extent that such ownership existed prior to such Corporate  Transaction and
     (C) at least a majority  of the  members of the board of  directors  of the
     corporation  resulting from such Corporate  Transaction were members of the
     Incumbent Board at the time of the execution of the initial agreement or of
     the action of the Board providing for such Corporate Transaction.

     2.5 "CODE" means the internal Revenue Code of 1986, as amended.

     2.6 "COMMITTEE" means the Compensation  Committee of the Board of Directors
or such other  committee  designated  by the Board of  Directors.  The Committee
shall be comprised solely of at least two members who are Non-Employee Directors
and Outside Directors.

     2.7 "COMPANY" means Aronex Pharmaceuticals, Inc., a Delaware corporation.

     2.8  "CONSULTANT"  means a person  who is  engaged  by the  Company  or any
Affiliate to render consulting services and to whom an Option is granted.


WOD01:4414.1
                                       -3-

<PAGE>



     2.9 "DISABILITY" means a physical or mental infirmity which, in the opinion
of a  physician  selected  by the  Committee,  shall  prevent  the  Employee  or
Consultant  from  earning  a  reasonable  livelihood  with  the  Company  or any
Affiliate  and which can be  expected  to result in death or which has lasted or
can be expected to last for a  continuous  period of not less than 12 months and
which:  (a) was not  contracted,  suffered  or  incurred  while the  Employee or
Consultant was engaged in, or did not result from having engaged in, a felonious
criminal  enterprise;  (b)  did not  result  from  alcoholism  or  addiction  to
narcotics;  and (c) did not result from an injury incurred while a member of the
Armed Forces of the United States for which the Employee or Consultant  receives
a military pension.

     2.10 "EMPLOYEE"  means a person employed by the Company or any Affiliate to
whom an Option is granted.

     2.11  "FAIR  MARKET  VALUE" of the Stock as of any date  means (a) the last
sale price of the Stock on that date (or, if there was no sale on such date, the
next preceding date on which there was such a sale) as reported on the principal
securities  exchange  on which the Stock is  listed;  or (b) if the Stock is not
listed on a securities  exchange,  the last sale price of the Stock on that date
(or, if there was no sale on such date,  the next  preceding date on which there
was such a sale) as reported on the Nasdaq Stock Market;  or (c) if the Stock is
not  listed on the  Nasdaq  Stock  Market,  the  average of the high and low bid
quotations  for the Stock on that date as  reported  by the  National  Quotation
Bureau Incorporated; or (d) if none of the foregoing is applicable, an amount at
the election of the Committee  equal to (x) the average  between the closing bid
and ask  prices  per share of Stock on the last  preceding  date on which  those
prices were reported or (y) an amount as determined by the Committee in its sole
discretion.

     2.12  "INCENTIVE  OPTION" means an Option  granted under this Plan which is
designated as an "Incentive  Option" and satisfies the  requirements  of Section
422 of the Code.

     2.13 "NON-EMPLOYEE  DIRECTOR" means a "non-employee  director" as that term
is defined in Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

     2.14  "NONQUALIFIED  OPTION" means an Option  granted under this Plan other
than an Incentive Option.

     2.15 "OPTION"  means either an Incentive  Option or a  Nonqualified  Option
granted under this Plan to purchase shares of Stock.

     2.16  "OPTION  AGREEMENT"  means the written  agreement  which sets out the
terms of an Option.

     2.17 "OPTIONEE" means a person who is granted an Option under this Plan.

     2.18 "OUTSIDE DIRECTOR" means a member of the Board of Directors serving on
the Committee who satisfies the criteria of Section 162(m) of the Code.

     2.19 "PLAN" means the Aronex Pharmaceuticals,  Inc. 1998 Stock Option Plan,
as set out in this document and as it may be amended from time to time.

     2.20 "STOCK"  means the common  stock of the  Company,  par value $.001 per
share,  or, in the event that the  outstanding  shares of common stock are later
changed into or exchanged  for a different  class of stock or  securities of the
Company or another corporation, that other stock or security.

     2.21 "10%  STOCKHOLDER"  means an individual who, at the time the Option is
granted,  owns stock possessing more than 10% of the total combined voting power
of all classes of stock of the Company or of any Affiliate.  An individual shall
be considered as owning the stock owned,  directly or indirectly,  by or for his
brothers and sisters  (whether by the whole or half blood),  spouse,  ancestors,
and lineal descendants; and stock owned, directly or indirectly,

WOD01:4414.1
                                       -4-

<PAGE>



by or for a corporation,  partnership,  estate, or trust, shall be considered as
being  owned   proportionately   by  or  for  its   stockholders,   partners  or
beneficiaries.


                                   ARTICLE III

                                   ELIGIBILITY

     The individuals who shall be eligible to receive Incentive Options shall be
those key  employees of the Company or any of its  Affiliates  as the  Committee
shall  determine  from time to time.  The  individuals  who shall be eligible to
receive Nonqualified Options shall be those key employees and consultants of the
Company or any of its Affiliates as the Committee  shall  determine from time to
time. No member of the  Committee  shall be eligible to receive any Option or to
receive stock, stock options,  or stock appreciation rights under any other plan
of the Company or any of its Affiliates,  if to do so would cause the individual
not to be a Non-Employee Director or an Outside Director. The Board of Directors
may designate one or more  individuals  who shall not be eligible to receive any
Option under this Plan or under other similar plans of the Company.


                                   ARTICLE IV

                     GENERAL PROVISIONS RELATING TO OPTIONS

     4.1  AUTHORITY  TO  GRANT  OPTIONS.   The  Committee  may  grant  to  those
individuals,  as it shall from time to time  determine,  Options under the terms
and conditions of this Plan. Subject only to any applicable  limitations set out
in this  Plan,  the  number of shares of Stock to be covered by any Option to be
granted to an Employee  or  Consultant  of the Company or any of its  Affiliates
shall be as determined by the Committee.

     4.2 DEDICATED  SHARES.  The total number of shares of Stock with respect to
which  Options may be granted  under the Plan shall be 750,000  shares of Stock.
The shares may be treasury shares or authorized but unissued  shares.  The total
number of shares of Stock with respect to which Incentive Options may be granted
under the Plan shall be 750,000 shares.  The maximum number of shares subject to
Options which may be issued to any Optionee  under the Plan during any period of
three consecutive  years is 250,000 shares.  The number of shares stated in this
Section 4.2 shall be subject to adjustment in accordance  with the provisions of
Section 4.5.

     In the event that any outstanding  Option shall expire or terminate for any
reason or any  Option is  surrendered,  the  shares  of Stock  allocable  to the
unexercised  portion of that Option may again be subject to an Option  under the
Plan.

     4.3 NON-TRANSFERABILITY.  Options shall not be transferable by the Optionee
otherwise than (i) by will or under the laws of descent and distribution or (ii)
pursuant  to a qualified  domestic  relations  order as defined in the Code,  in
Title I of the  Employee  Retirement  Income  Security  Act, or in the rules and
regulations  as may be in  effect  from  time to time  thereunder,  and shall be
exercisable, during the Optionee's lifetime, only by him.

     4.4 REQUIREMENTS OF LAW. The Company shall not be required to sell or issue
any Stock under any Option if issuing that Stock would constitute or result in a
violation by the Optionee or the Company of any  provision of any law,  statute,
or regulation of any governmental  authority.  Specifically,  in connection with
any applicable statute or regulation relating to the registration of securities,
upon  exercise  of any Option,  the  Company  shall not be required to issue any
Stock unless the  Committee  has  received  evidence  satisfactory  to it to the
effect  that the holder of that  Option will not  transfer  the Stock  except in
accordance  with  applicable  law,  including  receipt  of an opinion of counsel
satisfactory  to the Company to the effect that any proposed  transfer  complies
with applicable law. The  determination by the Committee on this matter shall be
final,  binding  and  conclusive.  The  Company  may,  but  shall in no event be
obligated  to,  register any Stock  covered by this Plan  pursuant to applicable
securities  laws of any country or any political  subdivision.  In the event the
Stock issuable on exercise of an Option is not registered, the Company

WOD01:4414.1
                                       -5-

<PAGE>



may imprint on the certificate  evidencing the Stock any legend that counsel for
the Company considers  necessary or advisable to comply with applicable law. The
Company shall not be obligated to take any other affirmative  action in order to
cause the exercise of an Option and the issuance of shares thereunder, to comply
with any law or regulation of any governmental authority.

     4.5  CHANGES  IN  THE  COMPANY'S  CAPITAL   STRUCTURE.   The  existence  of
outstanding  Options  shall  not  affect  in any way the  right  or power of the
Company   or  its   stockholders   to  make  or   authorize   any   adjustments,
recapitalizations,  reorganizations  or other changes in the  Company's  capital
structure or its business, or any merger or consolidation of the Company, or any
issue of bonds,  debentures,  preferred  or prior  preference  stock ahead of or
affecting the Stock or its rights,  or the  dissolution  or  liquidation  of the
Company,  or any sale or transfer of all or any part of its assets or  business,
or any other  corporate  act or  proceeding,  whether of a similar  character or
otherwise.

     If the Company shall effect a  subdivision  or  consolidation  of shares or
other capital  readjustment,  the payment of a stock dividend, or other increase
or reduction of the number of shares of the Stock outstanding, without receiving
compensation for it in money,  services or property then (a) the number,  class,
and per share price of shares of Stock subject to outstanding Options under this
Plan shall be appropriately  adjusted in such a manner as to entitle an Optionee
to  receive  upon  exercise  of  an  Option,   for  the  same   aggregate   cash
consideration,  the  equivalent  total  number and class of shares he would have
received  had he  exercised  his Option in full  immediately  prior to the event
requiring the  adjustment;  and (b) the number and class of shares of Stock then
reserved to be issued under the Plan shall be adjusted by  substituting  for the
total number and class of shares of Stock then  reserved,  that number and class
of shares of Stock that would have been received by the owner of an equal number
of  outstanding  shares  of such  class  of  Stock as the  result  of the  event
requiring the adjustment.

     If the Company is merged or consolidated  with another  corporation and the
Company is not the  surviving  corporation,  or if the Company is  liquidated or
sells or otherwise  disposes of substantially  all its assets while  unexercised
Options  remain  outstanding  under this Plan,  (a) subject to the provisions of
clause  (c)  below,  after  the  effective  date of the  merger,  consolidation,
liquidation,  sale or other  disposition,  as the case may be, each holder of an
outstanding  Option shall be entitled,  upon exercise of the Option, to receive,
in lieu of shares of Stock,  the  number and class or classes of shares of stock
or other securities or property to which the holder would have been entitled if,
immediately  prior  to the  merger,  consolidation,  liquidation,  sale or other
disposition,  the  holder had been the holder of record of a number of shares of
Stock  equal  to the  number  of  shares  as to  which  the  Option  shall be so
exercised;  (b) the Committee  shall waive any limitations set out in or imposed
under  this  Plan so that  all  Options,  from  and  after a date  prior  to the
effective  date  of  the  merger,  consolidation,  liquidation,  sale  or  other
disposition,  as  the  case  may  be,  specified  by  the  Committee,  shall  be
exercisable  in full;  and (c) all  outstanding  Options  may be canceled by the
Committee as of the effective  date of any merger,  consolidation,  liquidation,
sale or other disposition,  if (i) notice of cancellation shall be given to each
holder of an Option  and (ii) each  holder of an Option  shall have the right to
exercise that Option in full (without  regard to any  limitations  set out in or
imposed under this Plan or the Option  Agreement  granting that Option) during a
period  set by  the  Committee  preceding  the  effective  date  of the  merger,
consolidation,  liquidation,  sale or other disposition and, if in the event all
outstanding  Options may not be  exercised in full under  applicable  securities
laws  without  registration  of the shares of Stock  issuable on exercise of the
Options,  the  Committee  may limit the exercise of the Options to the number of
shares of Stock,  if any, as may be issued without  registration.  The method of
choosing  which Options may be exercised,  and the number of shares of Stock for
which  Options may be exercised,  shall be solely  within the  discretion of the
Committee.

     The issue by the  Company  of shares of stock of any class,  or  securities
convertible  into  shares of stock of any class,  for cash or  property,  or for
labor or services  either  upon  direct  sale or upon the  exercise of rights or
warrants to subscribe for them, or upon  conversion of shares or  obligations of
the Company  convertible into shares or other securities,  shall not affect, and
no  adjustment  by reason of such  issuance  shall be made with  respect to, the
number, class, or price of shares of Stock then subject to outstanding Options.

     4.6 CHANGES OF CONTROL. In the event of a Change of Control,  the Committee
may, in its discretion, at the time an Option is granted or any time thereafter:
(i) provide for the acceleration of any time period

WOD01:4414.1
                                       -6-

<PAGE>



relating to the  exercise of the Option,  (ii)  provide for the  purchase of the
Option upon the Optionee's  request for an amount of cash or other property that
could have been  received  upon the  exercise  of the Option had the Option been
then  currently  exercisable,  (iii)  adjust the terms of the Option in a manner
determined  by the  Committee  to reflect the Change of Control,  (iv) cause the
Option to be assumed, or new rights substituted therefore, by another entity, or
(v) make such other  provisions as the  Committee may consider  equitable and in
the best interest of the Company.


                                    ARTICLE V

                                     OPTIONS

     5.1 TYPE OF OPTION.  The  Committee  shall  specify  whether a given Option
shall constitute an Incentive Option or a Nonqualified Option.

     5.2 OPTION PRICE. The price at which Stock may be purchased under an Option
shall not be less than the greater of: (a) 100% of the Fair Market  Value of the
shares of Stock on the date the Option is granted or (b) the aggregate par value
of the shares of Stock on the date the Option is granted. In the case of any 10%
Stockholder,  the  price at which  shares  of Stock  may be  purchased  under an
Incentive  Option  shall not be less than 110% of the Fair  Market  Value of the
Stock on the date the Incentive Option is granted.

     5.3 DURATION OF OPTIONS;  TERMINATION. No Option shall be exercisable after
the expiration of 10 years from the date the Option is granted. In the case of a
10% Stockholder,  no Incentive Option shall be exercisable  after the expiration
of five years from the date the Incentive  Option is granted.  Unless  otherwise
provided in the Option Agreement or by the Committee:

               (a) If the employment or engagement of an Optionee by the Company
          shall  terminate  for any reason  other than  Cause,  Disability,  the
          voluntary  retirement of the Optionee in accordance with the Company's
          retirement policy as then in effect or the death of the Optionee:  (i)
          Options  granted  to such  Optionee,  to the  extent  that  they  were
          exercisable at the time of such termination,  shall remain exercisable
          until the expiration of 90 days after such termination,  on which date
          they shall expire,  and (ii) Options granted to such Optionee,  to the
          extent that they were not exercisable at the time of such termination,
          shall expire at the close of business on the date of such termination;
          provided,  however,  that no  Option  shall be  exercisable  after the
          expiration of its term.

               (b) If the employment or engagement of an Optionee by the Company
          shall terminate on account of the Disability, the voluntary retirement
          of the Optionee in accordance with the Company's  retirement policy as
          then in effect or the death of the  Optionee:  (i) Options  granted to
          such Optionee, to the extent that they were exercisable at the time of
          such termination, shall remain exercisable until the expiration of one
          year after such termination, on which date they shall expire, and (ii)
          Options  granted to such  Optionee,  to the extent  that they were not
          exercisable at the time of such termination, shall expire at the close
          of business on the date of such termination;  provided,  however, that
          no Option shall be exercisable after the expiration of its term.

               (c) In the event of the  termination of an Optionee's  employment
          or  engagement  for Cause,  all  outstanding  Options  granted to such
          Optionee shall expire at the  commencement  of business on the date of
          such termination.

     5.4 AMOUNT EXERCISABLE.  Each Option may be exercised from time to time, in
whole or in part, in the manner and subject to the conditions the Committee,  in
its sole discretion,  may provide in the Option Agreement, as long as the Option
is valid and  outstanding.  To the extent that the  aggregate  Fair Market Value
(determined  as of the time an  Incentive  Option is  granted) of the Stock with
respect to which  Incentive  Options  first become  exercisable  by the Optionee
during any calendar year (under this Plan and any other  incentive  stock option
plan(s) of the Company or any Affiliate) exceeds $100,000, the Incentive Options
shall  be  treated  as  Nonqualified  Options.  In  making  this  determination,
Incentive  Options  shall be taken into  account in the order in which they were
granted.

WOD01:4414.1
                                       -7-

<PAGE>



     5.5 EXERCISE OF OPTIONS.  Each Option shall be exercised by the delivery of
written notice to the Company, to the attention of its Secretary,  setting forth
the  number  of  shares  of Stock  with  respect  to which  the  Option is to be
exercised,  together with: (a) cash, wire transfer, certified check, bank draft,
or postal or express  money  order  payable to the order of the  Company  for an
amount  equal to the  option  price of the  shares,  or (b) if  approved  by the
Committee,  Stock at its Fair Market Value on the date of  exercise,  and/or any
other form of payment which is acceptable to the  Committee,  and specifying the
address to which the  certificates  for the shares are to be mailed.  Subject to
Sections  4.4 and 8.3,  as  promptly  as  practicable  after  receipt of written
notification and payment, the Company shall deliver to the Optionee certificates
for the number of shares  with  respect to which the Option has been  exercised,
issued in the  Optionee's  name.  If shares of Stock are used in  payment of the
exercise price,  the aggregate Fair Market Value of the shares of Stock tendered
must be equal to or less than the aggregate  exercise  price of the shares being
purchased upon exercise of the Option,  and any difference must be paid by cash,
certified  check,  bank draft,  or postal or express  money order payable to the
Company. Delivery of the shares shall be deemed effected for all purposes when a
stock transfer agent of the Company shall have deposited the certificates in the
United States mail,  addressed to the Optionee,  at the address specified by the
Optionee.

     Whenever an Option is exercised by exchanging  shares of Stock owned by the
Optionee,  the Optionee shall deliver to the Company certificates  registered in
the name of the Optionee  representing  a number of shares of Stock  legally and
beneficially owned by the Optionee,  free of all liens, claims, and encumbrances
of every kind,  accompanied by stock powers duly endorsed in blank by the record
holder of the shares represented by the certificates (with signature  guaranteed
by a commercial bank or trust company or by a brokerage firm having a membership
on a registered national stock exchange).  The delivery of certificates upon the
exercise of Options is subject to the condition  that the person  exercising the
Option  provide the Company with the  information  the Company might  reasonably
request pertaining to exercise, sale or other disposition of an Option.

     5.6 SUBSTITUTION OPTIONS.  Options may be granted under this Plan from time
to  time  in  substitution   for  stock  options  held  by  employees  of  other
corporations who are about to become employees of or affiliated with the Company
or any  Affiliate as the result of a merger or  consolidation  of the  employing
corporation with the Company or any Affiliate, or the acquisition by the Company
or any Affiliate of the assets of the employing corporation,  or the acquisition
by the Company or any  Affiliate of stock of the  employing  corporation  as the
result of which it becomes an Affiliate of the Company. The terms and conditions
of the substitute Options granted may vary from the terms and conditions set out
in this Plan  (including,  without  limitation,  the terms and  conditions  with
respect  to the price at which  Stock may be  purchased  under an Option) to the
extent the Committee,  at the time of grant, may deem appropriate to conform, in
whole or in part, to the  provisions of the stock  options in  substitution  for
which they are granted.

     5.7 NO  RIGHTS AS  STOCKHOLDER.  No  Optionee  shall  have any  rights as a
stockholder  with respect to Stock  covered by his Option until the date a stock
certificate is issued for the Stock.


                                   ARTICLE VI

                                 ADMINISTRATION

     This  Plan  shall  be  administered  by the  Committee.  All  questions  of
interpretation  and application of this Plan and Options shall be subject to the
determination of the Committee. A majority of the members of the Committee shall
constitute a quorum.  All  determinations  of the  Committee  shall be made by a
majority of its members.  Any decision or  determination  reduced to writing and
signed by a majority of the members shall be as effective as if it had been made
by a majority  vote at a meeting  properly  called and held.  This Plan shall be
administered  in such a manner as to permit the Options  granted  under it which
are  designated  to be  Incentive  Options to qualify as Incentive  Options.  In
carrying out its authority  under this Plan,  the Committee  shall have full and
final  authority  and  discretion,  including  but not limited to the  following
rights, powers and authorities, to:


WOD01:4414.1
                                       -8-

<PAGE>



               (a)  determine the persons to whom and the time or times at which
          Options will be made,

               (b)  determine  the  number of shares and the  purchase  price of
          Stock covered in each Option, subject to the terms of the Plan,

               (c)  determine  the  terms,  provisions  and  conditions  of each
          Option, which need not be identical,

               (d)  accelerate the time at which any  outstanding  Option may be
          exercised,

               (e)  define  the  effect,  if any,  on an  Option  of the  death,
          disability, retirement, or termination of employment of the Optionee,

               (f) prescribe,  amend and rescind rules and regulations  relating
          to administration of this Plan, and

               (g) make all  other  determinations  and take all  other  actions
          deemed   necessary,   appropriate,   or   advisable   for  the  proper
          administration of this Plan.

     The actions of the Committee in exercising all of the rights,  powers,  and
authorities  set out in this Article and all other  Articles of this Plan,  when
performed in good faith and in its sole judgment, shall be final, conclusive and
binding on all parties.


                                   ARTICLE VII

                        AMENDMENT OR TERMINATION OF PLAN

     The Board of Directors of the Company may amend,  terminate or suspend this
Plan at any time, in its sole and absolute discretion;  provided,  however, that
to the extent required to maintain the status of any Incentive  Option under the
Code, no amendment that would (a) change the aggregate number of shares of Stock
which may be issued under Incentive  Options,  (b) change the class of employees
eligible to receive  Incentive  Options,  or (c) decrease the exercise price for
Incentive  Options  below the Fair  Market  Value of the Stock at the time it is
granted,  shall be made  without  the  approval of the  Company's  stockholders.
Subject to the  preceding  sentence,  the Board shall have the power to make any
changes in this Plan and in the regulations and administrative  provisions under
it or in any outstanding  Incentive  Option as in the opinion of counsel for the
Company  may be  necessary  or  appropriate  from  time to time  to  enable  any
Incentive  Option granted under this Plan to continue to qualify as an incentive
stock option or such other stock  option as may be defined  under the Code so as
to receive preferential Federal income tax treatment.


                                  ARTICLE VIII

                                  MISCELLANEOUS

     8.1 NO  ESTABLISHMENT  OF A TRUST FUND. No property  shall be set aside nor
shall a trust  fund of any kind be  established  to  secure  the  rights  of any
Optionee under this Plan. All Optionees  shall at all times rely solely upon the
general  credit of the  Company for the  payment of any  benefit  which  becomes
payable under this Plan.

     8.2 NO  EMPLOYMENT  OBLIGATION.  The  granting  of  any  Option  shall  not
constitute  an  employment  contract,  express or  implied,  nor impose upon the
Company or any  Affiliate  any  obligation  to employ or  continue to employ any
Optionee.  The right of the Company or any Affiliate to terminate the employment
of any person shall not be  diminished or affected by reason of the fact that an
Option has been granted to him.


     WOD01:4414.1 
                                      -9-

<PAGE>



     8.3 TAX  WITHHOLDING.  The  Company or any  Affiliate  shall be entitled to
deduct from other  compensation  payable to each  Optionee any sums  required by
federal,  state,  or local tax law to be withheld  with  respect to the grant or
exercise of an Option. In the alternative,  the Company may require the Optionee
(or other person  exercising the Option) to pay the sum directly to the employer
corporation. If the Optionee (or other person exercising the Option) is required
to pay the sum  directly,  payment  in cash or by check of such  sums for  taxes
shall be  delivered  within  ten days  after  the date of  exercise  or lapse of
restrictions.  The Company shall have no obligation  upon exercise of any Option
until payment has been received,  unless  withholding  (or offset against a cash
payment) as of or prior to the date of exercise is  sufficient to cover all sums
due with respect to that exercise.  The Company and its Affiliates  shall not be
obligated to advise an Optionee of the  existence of the tax or the amount which
the employer corporation will be required to withhold.

     8.4 WRITTEN  AGREEMENT.  Each Option shall be embodied in a written  Option
Agreement  which shall be subject to the terms and  conditions  of this Plan and
shall be signed by the Optionee and by a member of the  Committee and an officer
of the Company on behalf of the Committee and the Company.  The Option Agreement
may contain any other provisions that the Committee in its discretion shall deem
advisable which are not inconsistent with the terms of this Plan.

     8.5  INDEMNIFICATION  OF THE  COMMITTEE  AND THE BOARD OF  DIRECTORS.  With
respect to administration of this Plan, the Company shall indemnify each present
and future member of the Committee and the Board of Directors against,  and each
member of the  Committee  and the Board of Directors  shall be entitled  without
further  action  his  part to  indemnity  from the  Company  for,  all  expenses
(including  attorneys'  fees, the amount of judgments and the amount of approved
settlements  made with a view to the  curtailment of costs of litigation,  other
than  amounts  paid  to  the  Company  itself)  reasonably  incurred  by  him in
connection  with or arising out of any action,  suit,  or proceeding in which he
may be involved by reason of his being or having been a member of the  Committee
and/or the Board of Directors, whether or not he continues to be a member of the
Committee   and/or  the  Board  of  Directors  at  the  time  of  incurring  the
expenses--including, without limitation, matters as to which he shall be finally
adjudged  in any  action,  suit or  proceeding  to have been  found to have been
negligent in the  performance of his duty as a member of the Committee or of the
Board of  Directors.  However,  this  indemnity  shall not include any  expenses
incurred by any member of the Committee and/or the Board of Directors in respect
of matters  as to which he shall be  finally  adjudged  in any  action,  suit or
proceeding to have been guilty of gross negligence or willful  misconduct in the
performance  of his duty as a member of the Committee or the Board of Directors.
In addition,  no right of indemnification  under this Plan shall be available to
or enforceable by any member of the Committee or the Board of Directors  unless,
within 60 days after  institution of any action,  suit or  proceeding,  he shall
have offered the Company, in writing,  the opportunity to handle and defend same
at its own expense.  This right of indemnification shall inure to the benefit of
the heirs,  executors or  administrators of each member of the Committee and the
Board of  Directors  and shall be in  addition  to all  other  rights to which a
member of the  Committee  and the Board of Directors may be entitled as a matter
of law, contract, or otherwise.

     8.6 GENDER. If the context requires,  words of one gender when used in this
Plan shall  include the others and words used in the  singular  or plural  shall
include the other.

     8.7   HEADINGS.   Headings  of  Articles  and  Sections  are  included  for
convenience of reference only and do not constitute  part of this Plan and shall
not be used in construing the terms of this Plan.

     8.8 OTHER  COMPENSATION  PLANS.  The adoption of this Plan shall not affect
any other stock  option,  incentive or other  compensation  or benefit  plans in
effect  for the  Company or any  Affiliate,  nor shall  this Plan  preclude  the
Company from establishing any other forms of incentive or other compensation for
employees of the Company or any Affiliate.

     8.9 OTHER OPTIONS. The grant of an Option shall not confer upon an Optionee
the right to receive any future or other Options under this Plan, whether or not
Options may be granted to similarly situated Optionees,  or the right to receive
future Options upon the same terms or conditions as previously granted.

WOD01:4414.1
                                      -10-

<PAGE>


     8.10 ARBITRATION OF DISPUTES. Any controversy arising out of or relating to
the Plan or an Option  Agreement  shall be  resolved  by  arbitration  conducted
pursuant to the arbitration rules of the American Arbitration  Association.  The
arbitration shall be final and binding on the parties.

     8.11  GOVERNING  LAW.  The  provisions  of this  Plan  shall be  construed,
administered, and governed under the laws of the State of Delaware.



WOD01:4414.1
                                      -11-


                              EMPLOYMENT AGREEMENT

     This Employment Agreement (this "Agreement"), dated as of June 12, 1998, is
entered into by and between Aronex Pharmaceuticals, Inc., a Delaware corporation
(the "Company"), and Praveen Tyle, Ph.D. (the "Executive").

                                   WITNESSETH:

     WHEREAS,  the Company  desires to employ the  Executive,  and the Executive
desires  to  continue  in the  employment  of the  Company,  upon the  terms and
conditions and in the capacities set forth herein;

     NOW,  THEREFORE,  in  consideration  of the premises and for other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the Company and the Executive hereby agree as follows:

     1.  Employment and Term of Employment.  Subject to the terms and conditions
of this  Agreement,  the Company hereby agrees to employ the Executive,  and the
Executive hereby agrees to serve the Company, as Vice President,  Pharmaceutical
Development  and Operations for a term (the "Term of  Employment")  beginning on
the date  first  set  forth  above  (the  "Effective  Date")  and  ending on the
Expiration Date (defined below).  As used in this Agreement,  "Expiration  Date"
means  the  first  anniversary  of the  Effective  Date,  provided  that on each
anniversary of the Effective Date (each such anniversary  being referred to as a
"Renewal  Date"),  the  Expiration  Date  shall be  automatically  extended  one
additional  year  unless,  not less than 10 days prior to the  relevant  Renewal
Date, (i) either party shall have given written notice to the other that no such
automatic  extension  shall  occur  after the date of such notice or (ii) either
party shall have given a Notice of  Termination to the other pursuant to Section
5 hereof. Notwithstanding the foregoing, if either party gives a valid Notice of
Termination  pursuant  to  Section 5 hereof,  the Term of  Employment  shall not
extend beyond the termination date specified in such Notice of Termination.

     2. Scope of Employment.  (a) During the Term of  Employment,  the Executive
agrees to (i) serve as Vice President, Pharmaceutical Development and Operations
of the  Company  and shall  have and may  exercise  all the  powers,  duties and
functions as are normal and customary to such  position and that are  consistent
with the  responsibilities  set  forth  with  respect  to such  position  in the
Company's  by-laws and (ii) perform such other duties not inconsistent  with his
position as are  assigned to him,  from time to time,  by the Board of Directors
(the  "Board") or Chief  Executive  Officer of the  Company.  During the Term of
Employment,  the Executive shall devote  substantially all of his business time,
attention,  skill  and  efforts  to  the  faithful  performance  of  his  duties
hereunder.  Provided that the Executive  complies with the foregoing  obligation
and the other  obligations set forth in this Agreement,  the Executive may serve
on a Scientific  Advisory  Board or in a similar role for one or more  companies
other than the Company.

          (b) During the Term of Employment,  the Executive  agrees to serve, if
     elected,  as an officer or director of any  subsidiary  or affiliate of the
     Company so long as such service is commensurate  with the Employee's duties
     and responsibilities to the Company.

     3.  Compensation.  During the Term of Employment,  in  consideration of the
Executive's  services hereunder,  including,  without limitation,  service as an
officer or director of the Company or of any  subsidiary  or affiliate  thereof,
and in consideration of the Executive's  agreements set forth in the Proprietary
Information  and Inventions and  Non-Competition  Agreement  dated March 5, 1998
between  the  Executive  and  the  Company  (the  "Proprietary  Information  and
Inventions Agreement"):


<PAGE>



          (a) the Executive  shall receive a salary at a rate  equivalent to the
     Executive's  current annual salary in effect on the Effective Date (payable
     at such regular intervals as other employees of the Company are compensated
     in accordance with the Company's employment practices),  which salary shall
     be  subject  to review  annually  by the Board and may be  adjusted  at its
     discretion, provided that such salary may not be reduced at any time.

          (b) the Executive shall be entitled to receive an annual cash bonus of
     up to 20% of the  Executive's  salary  based upon the  achievement  of such
     milestones as may be agreed upon by the Executive and the Board.

     4. Additional Compensation and Benefits. (a) As additional compensation for
the Executive's services under this Agreement and the Executive's agreements set
forth in the Proprietary  Information and Inventions Agreement,  during the Term
of  Employment,  the Company  agrees to provide the Executive  with the non-cash
benefits provided by the Company to its other officers and key employees as they
may exist from time to time.  Such benefits shall include such leave or vacation
time (not less than three weeks),  medical and dental insurance,  life insurance
and other health care benefits,  and  retirement and disability  benefits as may
hereafter be provided by the Company in accordance with its policies, as well as
any  stock  option  plan or  similar  employee  benefit  program  for  which key
executives are or shall become eligible.

          (b) The Executive is authorized to incur reasonable  business expenses
     for  promoting  the  business  and  reputation  of the  Company,  including
     (without limitation) reasonable expenditures for travel, lodging, meals and
     client,  patron,  customer and/or  business  associate  entertainment.  The
     Company  shall  reimburse  the  Executive  within  30 days  for  reasonable
     expenses  incurred  by  the  Executive  in  furtherance  of  the  Company's
     business,  provided that such expenses are incurred in accordance  with the
     Company's  policies and upon  presentation of  documentation  in accordance
     with expense  reimbursement  policies of the Company as they may exist from
     time to time,  and submission to the Company of adequate  documentation  in
     accordance  with  federal  income  tax   regulations   and   administrative
     pronouncements.

     5. Termination.

          (a) General. The Executive's  employment hereunder shall automatically
     terminate on the earlier of his death or the Expiration Date. The Executive
     may, at any time prior to the  Expiration  Date,  terminate his  employment
     hereunder  for any reason by  delivering a Notice of  Termination  (defined
     below) to the Board.  The Company may, at any time prior to the  Expiration
     Date,  terminate  the  Executive's  employment  hereunder for any reason by
     delivering a Notice of Termination to the Executive. The giving of a notice
     pursuant to clause (i) of the proviso contained in the penultimate sentence
     of Section I hereof shall not be deemed a  termination  of the  Executive's
     employment  by the party  giving such  notice.  As used in this  Agreement,
     "Notice of Termination"  means a notice in writing  purporting to terminate
     the Executive's  employment in accordance with this Section 5, which notice
     shall (i) specify the effective date of such  termination (not prior to the
     date of such notice) and (ii) in the case of a  termination  by the Company
     for Cause or Disability or a termination by the Executive for Disability or
     Good  Reason (in each case as such terms are defined  below),  set forth in
     reasonable  detail  the  reason  for such  termination  and the  facts  and
     circumstances claimed to provide a basis for such termination.



<PAGE>



          (b) Automatic  Termination on Expiration  Date or Death.  In the event
     the Executive's  employment hereunder shall automatically  terminate on the
     Expiration  Date or as a result of the  Executive's  death,  the  Executive
     shall only be entitled to receive, to the extent applicable, (i) all unpaid
     compensation  accrued  as of the  termination  date  pursuant  to Section 3
     hereof,  (ii) all unused  vacation  time accrued by the Executive as of the
     termination  date,  (iii) all amounts owing to the Executive  under Section
     4(b)  hereof and (iv) those  benefits  under  Section 4 which are  required
     under the  Employee  Retirement  Income  Security  Act of 1974,  as amended
     ("ERISA"),  or other laws.  The amounts  described in clauses (i), (ii) and
     (iii) of the  foregoing  sentence  shall be paid to the Executive in a lump
     sum payment promptly after the Expiration Date.

          (c)  Termination by Company for Cause.  If the Company  terminates the
     Executive's  employment for Cause,  the Executive shall only be entitled to
     receive the  compensation  and other  payments  described in paragraph  (b)
     above,  such  compensation  and  other  payments  to  be  paid  as  if  the
     Executive's  employment had automatically  terminated without the giving of
     any Notice of Termination.  As used in this  Agreement,  "Cause" shall mean
     (i) any material  failure of the Executive to perform his duties  specified
     in Section 2 of this Agreement (other than any such failure  resulting from
     the Executive's  incapacity due to Disability) after written notice of such
     failure has been given to the Executive by the Board or the Company's Chief
     Executive  Officer and such failure shall have  continued for 30 days after
     receipt of such notice,  (ii) gross  negligence  or willful or  intentional
     wrongdoing or misconduct,  (iii) a material  breach by the Executive of the
     Proprietary  Information  and Inventions and  Non-Competition  Agreement of
     even  date  herewith  between  the  Execution  e and  the  Company  or  any
     subsequent  such agreement  between the Executive and the Company,  or (iv)
     conviction of the Executive of a felony offense or a crime  involving moral
     turpitude.

          (d)  Termination  for  Disability.   To  provide  for  the  event  the
     Executive's employment is terminated by either the Company or the Executive
     on account of Disability  (defined below), the Company shall provide or, as
     applicable,   cause  its  disability  insurance  carrier  to  provide,  the
     Executive  such  disability  benefits as may  hereafter  be provided by the
     Company in  accordance  with its  policies,  as they may exist from time to
     time. As used herein,  "Disability"  means any physical or mental condition
     of the Executive that (i) prevents the Executive from being able to perform
     the services required under this Agreement, (ii) has continued for at least
     180  consecutive  days during any 12- month period and (iii) is  reasonably
     expected to continue.

          (e) Termination by Company  Without Cause.  If the Company  terminates
     the  Executive's  employment  for any  reason  other  than for  Cause or on
     account of Disability, the Company shall:

               (i) pay to the Executive,  for the period of 12 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above; and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the  Company  shall be required  to provide  benefits  under the
          Consolidated  Omnibus  Budget  Reconciliation  Act of  1985  ("COBRA")
          following the date of such termination).


<PAGE>



          (f)  Termination by the Executive  with Good Reason.  If the Executive
     terminates his employment for Good Reason (as defined  below),  the Company
     shall:

               (i) pay to the Executive,  for the period of 24 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above; and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the Company  shall be required to provide  benefits  under COBRA
          following the date of such termination).

As used in this Agreement, "Good Reason" shall mean a material diminution in the
title,  powers,  duties,  responsibilities  or  functions  of the  Executive  as
described in Section 2 hereof  within one year  following  the  occurrence  of a
Change of Control.

As used in this Agreement, a "Change of Control" shall mean:

               (i) the  acquisition  after the Effective Date by any individual,
          entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of
          the  Securities  Exchange  Act of 1934,  as amended) (a  "Person")  of
          beneficial ownership of 50% or more of either (i) the then outstanding
          shares of common stock of the Company (the "Outstanding Common Stock")
          or (ii) the  combined  voting  power of the  then  outstanding  voting
          securities of the Company  entitled to vote  generally in the election
          of directors (the "Outstanding Voting Securities"),  provided that for
          purposes of this subsection (i), the following  acquisitions shall not
          constitute a Change of Control:  (A) any acquisition directly from the
          Company,  (B) any  acquisition by the Company,  (C) any acquisition by
          any employee  benefit plan (or related trust)  sponsored or maintained
          by the Company or any  corporation  controlled by the Company,  or (D)
          any  acquisition by any  corporation  pursuant to a transaction  which
          complies with clauses (A), (B) and (C) of subsection (ii) hereof; or

               (ii)  consummation  after the Effective Date of a reorganization,
          merger  or  consolidation  or  sale  or  other  disposition  of all or
          substantially   all  of  the  assets  of  the  Company  (a  "Corporate
          Transaction")   in  each  case,   unless,   following  such  Corporate
          Transaction,  (A) (1) all or substantially all of the persons who were
          the  beneficial  owners of the  Outstanding  Common Stock  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more  than 50% of the then  outstanding  shares of common
          stock of the  corporation  resulting from such Corporate  Transaction,
          and  (2)  all or  substantially  all  of  the  persons  who  were  the
          beneficial  owners of the Outstanding  Voting  Securities  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more than 50% of the  combined  voting  power of the then
          outstanding  voting  securities  entitled  to  vote  generally  in the
          election of directors of the corporation resulting from such Corporate
          Transaction (including,  without limitation,  a corporation which as a
          result of such  transaction  owns the Company or all or  substantially
          all of the  Company's  assets  either  directly or through one or more
          subsidiaries) in substantially the same proportions as their ownership
          of the Outstanding  Common Stock and the Outstanding Voting Securities
          immediately prior to such Corporate  Transaction,  as the case may be,
          (B) no  Person  (excluding  (1) any  corporation  resulting  from such
          Corporate  Transaction or any employee benefit plan (or related trust)
          of the  Company  orsuch  corporation  resulting  from  such  Corporate
          Transaction and (2) any Person approved by the members of the Board in
          office immediately prior to such Corporate  Transaction)  beneficially
          owns,  directly  or  indirectly,  50% or more of the then  outstanding
          shares  of  common  stock  of  the  corporation  resulting  from  such
          Corporate  Transaction  or the  combined  voting  power  of  the  then
          outstanding voting securities of such corporation except to the extent
          that such ownership  existed prior to such Corporate  Transaction  and
          (C) at least a majority  of the members of the board of  directors  of
          the corporation resulting from such Corporate Transaction were members
          of the Board at the time of the execution of the initial  agreement or
          of the action of the Board providing for such Corporate Transaction.
<PAGE>
     6.  Non-exclusivity  of Rights.  Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit,  bonus,
incentive  or  other  plan or  program  provided  by the  Company  or any of its
affiliated companies and for which the Executive may qualify, nor shall anything
herein limit or otherwise affect such rights as the Executive may have under any
stock  option or other  agreements  with the  Company  or any of its  affiliated
companies. Amounts which are vested benefits or which the Executive is otherwise
entitled  to  receive  under any plan or  program  of the  Company or any of its
affiliated  companies  at or  subsequent  to  the  date  of  termination  of the
Executive's  employment under this Agreement shall be payable in accordance with
such plan or program.

     7. Resolution of Disputes.

          (a) Negotiate.  The parties shall attempt in good faith to resolve any
     dispute  arising  out  of  or  relating  to  this  Agreement   promptly  by
     negotiations  between the Executive and an executive officer of the Company
     who has authority to settle the  controversy.  Any party may give the other
     party written  notice of any dispute not reveled in the normal course of
     business.  Within 10 days after the  effective  date of such  notice,  the
     Executive and an executive  officer of the Company shall meet at a mutually
     acceptable time and place within the Houston,  Texas metropolitan area, and
     thereafter as often as they reasonably deem necessary, to exchange relevant
     information  and to attempt to resolve the  dispute.  If the matter has not
     been resolved  within 30 days of the disputing  party's  notice,  or if the
     parties fail to meet within 10 days, either party may initiate  arbitration
     of the  controversy  or  claim as  provided  hereinafter.  If a  negotiator
     intends to be accompanied at a meeting by an attorney, the other negotiator
     shall be given at least three  business  days notice of such  intention and
     may also be accompanied by an attorney.  All negotiations  pursuant to this
     Section 7(a) shall be treated as compromise and settlement negotiations for
     the purposes of the federal and state rules of evidence and procedure.

          (b)  Arbitration.  Any  dispute  arising  out of or  relating  to this
     Agreement or the breach,  termination  or validity  thereof,  which has not
     been  resolved by  non-binding  means as provided in Section 7(a) within 60
     days of the  initiation  of such  procedure,  shall be  finally  settled by
     arbitration  conducted  expeditiously  in  accordance  with the  Center for
     Public Resources,  Inc. ("CPR") Rules for  Non-Administered  Arbitration of
     Business Disputes by three independent and impartial  arbitrators,  of whom
     each party shall appoint one,  provided that if one party has requested the
     other to participate in a non-binding procedure and the other has failed to
     participate,  the  requesting  party may  initiate  arbitration  before the
     expiration of such period.  Any such arbitration shall take place in Harris
     County,  Texas.  Any arbitrator not appointed by a party shall be appointed
     from the CPR Panels of Neutrals.  The arbitration  shall be governed by the
     United States  Arbitration Act and any judgment upon the award decided upon
     by the arbitrators may be entered by any court having jurisdiction thereof.
     Each party hereby  acknowledges that compensatory  damages include (without
     limitation) any benefit or right of indemnification  given by another party
     to the other under this Agreement


<PAGE>




     8.  GOVERNING  LAW.  This  Agreement  shall be governed by and construed in
accordance with the internal laws of the State of Texas.  Venue and jurisdiction
of any act on relating to this agreement  shall lie in Harris County,  Texas. 

     9.  Notice.  Any  notice,  payment,  demand or  communication  required  or
permitted  to  be  given  by  this  Agreement  shall  be  deemed  to  have  been
sufficiently given or served for all purposes if delivered personally or if sent
by registered or certified  mall,  return receipt  requested,  postage  prepaid,
addressed to such party at its address set forth below such party's signature to
this  Agreement or to such other address as shall have been furnished in writing
by such party for whom the  communication is intended.  Any such notice shall be
deemed to be given on the date so delivered.

     1O.  Severability.  In the event any provisions hereof shall he modified or
held ineffective by any court, such adjudication  shall not invalidate or render
ineffective the balance of the provisions hereof.

     11.  Entire  Agreement.  This  Agreement,  together  with  the  Proprietary
Information and Inventions Agreement, constitutes the sole agreement between the
parties  with  respect to the  employment  of the  Executive  by the Company and
supersedes any and all other agreements, oral or written, between the parties.

     12.  Amendment  and Waiver.  This  Agreement may not be modified or amended
except by a writing  signed by the  parties.  Any waiver or breach of any of the
terms of this  Agreement  shall not  operate as a waiver of any other  breach of
such  terms or  conditions,  or any  other  terms or  conditions,  nor shall any
failure to enforce any  provisions  hereof operate as a waiver of such provision
or any other provision hereof.

     13. Assignment.  This Agreement is a personal  employment  contract and the
rights and  interests of the Executive  hereunder may not be sold,  transferred,
assigned or pledged.  The Company may assign its rights under this  Agreement to
(i) any entity  into or with which the Company is merged or  consolidated  or to
which the Company  transfers all or substantially  all of its assets or (ii) any
entity, which at the time of such assignment  controls,  is under common control
with, or is  controlled  by the Company,  provided that the Company will require
any successor (whether direct or indirect, by purchase, merger, consolidation or
otherwise)  to all or  substantially  all of the business  and/or  assets of the
Company,  by  agreement  in form  and  substance  reasonably  acceptable  to the
Executive,  to expressly  assume and agree to perform this Agreement in the same
manner and to the same extent  that the Company  would be required to perform it
if not such succession had taken place.

     14.  Successors.  This  Agreement  shall be  binding  upon and inure to the
benefit of the  Executive  and his heirs,  executors,  administrators  and legal
representatives.  This Agreement  shall be binding upon and inure to the benefit
of the Company and its successors and assigns.

     15.  Section  Headings.  The section  headings in this  Agreement have been
inserted for convenience and shall not be used for  interpretive  purposes or to
otherwise construe this Agreement.


<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
he date first written above and intended that this  Agreement have the effect of
a sealed instrument.

                                               By: /S/PRAVEEN TYLE, Ph.D.
                                               --------------------------
                                               Praveen Tyle, Ph.D.


                                               ARONEX PHARMACEUTICALS, INC.

                                               By: /S/GEOFFREY F. COX, Ph.D.
                                               -----------------------------
                                               Geoffrey F. Cox, Ph.D.
                                               Chief Executive Officer




                              EMPLOYMENT AGREEMENT



     This Employment Agreement (this "Agreement"), dated as of June 12, 1998, is
entered into by and between Aronex Pharmaceuticals, Inc., a Delaware corporation
(the "Company"), and Paul A. Cossum, Ph.D. (the "Executive").

                                   WITNESSETH:

     WHEREAS,  the Company  desires to employ the  Executive,  and the Executive
desires  to  continue  in the  employment  of the  Company,  upon the  terms and
conditions and in the capacities set forth herein;

     NOW,  THEREFORE,  in  consideration  of the premises and for other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the Company and the Executive hereby agree as follows:

     1.  Employment and Term of Employment.  Subject to the terms and conditions
of this  Agreement,  the Company hereby agrees to employ the Executive,  and the
Executive  hereby agrees to serve the Company,  as Vice  President,  Preclinical
Research and Development for a term (the "Term of Employment")  beginning on the
date first set forth above (the  "Effective  Date") and ending on the Expiration
Date (defined  below).  As used in this Agreement,  "Expiration  Date" means the
first  anniversary of the Effective Date,  provided that on each  anniversary of
the  Effective  Date  (each such  anniversary  being  referred  to as a "Renewal
Date"), the Expiration Date shall be automatically  extended one additional year
unless,  not less than 10 days prior to the relevant  Renewal  Date,  (i) either
party  shall  have  given  written  notice to the other  that no such  automatic
extension  shall occur after the date of such notice or (ii) either  party shall
have given a Notice of  Termination  to the other  pursuant to Section 5 hereof.
Notwithstanding  the  foregoing,  if  either  party  gives  a  valid  Notice  of
Termination  pursuant  to  Section 5 hereof,  the Term of  Employment  shall not
extend beyond the termination date specified in such Notice of Termination.

     2. Scope of Employment.  (a) During the Term of  Employment,  the Executive
agrees to (i) serve as Vice President,  Preclinical  Research and Development of
the Company and shall have and may exercise all the powers, duties and functions
as are normal and  customary to such position and that are  consistent  with the
responsibilities  set forth  with  respect  to such  position  in the  Company's
by-laws and (ii) perform such other duties not inconsistent with his position as
are assigned to him, from time to time, by the Board of Directors  (the "Board")
or Chief Executive  Officer of the Company.  During the Term of Employment,  the
Executive shall devote substantially all of his business time, attention,  skill
and efforts to the faithful performance of his duties hereunder.

          (b) During the Term of Employment,  the Executive  agrees to serve, if
     elected,  as an officer or director of any  subsidiary  or affiliate of the
     Company so long as such service is commensurate  with the Employee's duties
     and responsibilities to the Company.

     3.  Compensation.  During the Term of Employment,  in  consideration of the
Executive's  services hereunder,  including,  without limitation,  service as an
officer or director of the Company or of any  subsidiary  or affiliate  thereof,
and in consideration of the Executive's  agreements set forth in the Proprietary
Information  and Inventions and  Non-Competition  Agreement  dated June 12, 1998
between  the  Executive  and  the  Company  (the  "Proprietary  Information  and
Inventions Agreement"):





<PAGE>



          (a) the Executive  shall receive a salary at a rate  equivalent to the
     Executive's  current annual salary in effect on the Effective Date (payable
     at such regular intervals as other employees of the Company are compensated
     in accordance with the Company's employment practices),  which salary shall
     be  subject  to review  annually  by the Board and may be  adjusted  at its
     discretion, provided that such salary may not be reduced at any time.

          (b) the Executive shall be entitled to receive an annual cash bonus of
     up to 20% of the  Executive's  salary  based upon the  achievement  of such
     milestones as may be agreed upon by the Executive and the Board.

     4. Additional Compensation and Benefits. (a) As additional compensation for
the Executive's services under this Agreement and the Executive's agreements set
forth in the Proprietary  Information and Inventions Agreement,  during the Term
of  Employment,  the Company  agrees to provide the Executive  with the non-cash
benefits provided by the Company to its other officers and key employees as they
may exist from time to time.  Such benefits shall include such leave or vacation
time (not less than three weeks),  medical and dental insurance,  life insurance
and other health care benefits,  and  retirement and disability  benefits as may
hereafter be provided by the Company in accordance with its policies, as well as
any  stock  option  plan or  similar  employee  benefit  program  for  which key
executives are or shall become eligible.

          (b) The Executive is authorized to incur reasonable  business expenses
     for  promoting  the  business  and  reputation  of the  Company,  including
     (without limitation) reasonable expenditures for travel, lodging, meals and
     client,  patron,  customer and/or  business  associate  entertainment.  The
     Company  shall  reimburse  the  Executive  within  30 days  for  reasonable
     expenses  incurred  by  the  Executive  in  furtherance  of  the  Company's
     business,  provided that such expenses are incurred in accordance  with the
     Company's  policies and upon  presentation of  documentation  in accordance
     with expense  reimbursement  policies of the Company as they may exist from
     time to time,  and submission to the Company of adequate  documentation  in
     accordance  with  federal  income  tax   regulations   and   administrative
     pronouncements.

     5. Termination.

          (a) General. The Executive's  employment hereunder shall automatically
     terminate on the earlier of his death or the Expiration Date. The Executive
     may, at any time prior to the  Expiration  Date,  terminate his  employment
     hereunder  for any reason by  delivering a Notice of  Termination  (defined
     below) to the Board.  The Company may, at any time prior to the  Expiration
     Date,  terminate  the  Executive's  employment  hereunder for any reason by
     delivering a Notice of Termination to the Executive. The giving of a notice
     pursuant to clause (i) of the proviso contained in the penultimate sentence
     of Section I hereof shall not be deemed a  termination  of the  Executive's
     employment  by the party  giving such  notice.  As used in this  Agreement,
     "Notice of Termination"  means a notice in writing  purporting to terminate
     the Executive's  employment in accordance with this Section 5, which notice
     shall (i) specify the effective date of such  termination (not prior to the
     date of such notice) and (ii) in the case of a  termination  by the Company
     for Cause or Disability or a termination by the Executive for Disability or
     Good  Reason (in each case as such terms are defined  below),  set forth in
     reasonable  detail  the  reason  for such  termination  and the  facts  and
     circumstances claimed to provide a basis for such termination.

          (b) Automatic  Termination on Expiration  Date or Death.  In the event
     the Executive's  employment hereunder shall automatically  terminate on the
     Expiration  Date or as a result of the  Executive's  death,  the  Executive
     shall only be entitled to receive, to the extent applicable, (i) all unpaid
     compensation  accrued  as of the  termination  date  pursuant  to Section 3
     hereof,  (ii) all unused  vacation  time accrued by the Executive as of the
     termination  date,  (iii) all amounts owing to the Executive  under Section
     4(b)  hereof and (iv) those  benefits  under  Section 4 which are  required
     under the  Employee  Retirement  Income  Security  Act of 1974,  as amended
     ("ERISA"),  or other laws.  The amounts  described in clauses (i), (ii) and
     (iii) of the  foregoing  sentence  shall be paid to the Executive in a lump
     sum payment promptly after the Expiration Date.
<PAGE>
          (c)  Termination by Company for Cause.  If the Company  terminates the
     Executive's  employment for Cause,  the Executive shall only be entitled to
     receive the  compensation  and other  payments  described in paragraph  (b)
     above,  such  compensation  and  other  payments  to  be  paid  as  if  the
     Executive's  employment had automatically  terminated without the giving of
     any Notice of Termination.  As used in this  Agreement,  "Cause" shall mean
     (i) any material  failure of the Executive to perform his duties  specified
     in Section 2 of this Agreement (other than any such failure  resulting from
     the Executives  incapacity due to Disability)  after written notice of such
     failure has been given to the Executive by the Board or the Company's Chief
     Executive  Officer and such failure shall have  continued for 30 days after
     receipt of such notice,  (ii) gross  negligence  or willful or  intentional
     wrongdoing or misconduct,  (iii) a material  breach by the Executive of the
     Proprietary  Information  and Inventions and  Non-Competition  Agreement of
     even date herewith  between the Executive and the Company or any subsequent
     such agreement between the Executive and the Company, or (iv) conviction of
     the Executive of a felony offense or a crime involving moral turpitude.

          (d)  Termination  for  Disability.   To  provide  for  the  event  the
     Executive's employment is terminated by either the Company or the Executive
     on account of Disability  (defined below), the Company shall provide or, as
     applicable,   cause  its  disability  insurance  carrier  to  provide,  the
     Executive  such  disability  benefits as may  hereafter  be provided by the
     Company in  accordance  with its  policies,  as they may exist from time to
     time. As used herein,  "Disability"  means any physical or mental condition
     of the Executive that (i) prevents the Executive from being able to perform
     the services required under this Agreement, (ii) has continued for at least
     180  consecutive  days during any 12-month  period and (iii) is  reasonably
     expected to continue.

          (e) Termination by Company  Without Cause.  If the Company  terminates
     the  Executive's  employment  for any  reason  other  than for  Cause or on
     account of Disability, the Company shall:

               (i) pay to the Executive,  for the period of 12 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above; and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the  Company  shall be required  to provide  benefits  under the
          Consolidated  Omnibus  Budget  Reconciliation  Act of  1985  ("COBRA")
          following the date of such termination).

          (f)  Termination by the Executive  with Good Reason.  If the Executive
     terminates his employment for Good Reason (as defined  below),  the Company
     shall:




<PAGE>



               (i) pay to the Executive,  for the period of 24 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above: and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the Company  shall be required to provide  benefits  under COBRA
          following the date of such termination).

As used in this Agreement,  Good Reason" shall mean a material diminution in the
title,  powers,  duties,  responsibilities  or  functions  of the  Executive  as
described in Section 2 hereof  within one year  following  the  occurrence  of a
Change of Control.

As used in this Agreement, a "Change of Control" shall mean:

               (i) the  acquisition  after the Effective Date by any individual,
          entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of
          the  Securities  Exchange  Act of 1934,  as amended) (a  "Person")  of
          beneficial ownership of 50% or more of either (i) the then outstanding
          shares of common stock of the Company (the "Outstanding Common Stock")
          or (ii) the  combined  voting  power of the  then  outstanding  voting
          securities of the Company  entitled to vote  generally in the election
          of directors (the "Outstanding Voting Securities"),  provided that for
          purposes of this subsection (i), the following  acquisitions shall not
          constitute a Change of Control:  (A) any acquisition directly from the
          Company,  (B) any  acquisition by the Company,  (C) any acquisition by
          any employee  benefit plan (or related trust)  sponsored or maintained
          by the Company or any  corporation  controlled by the Company,  or (D)
          any  acquisition by any  corporation  pursuant to a transaction  which
          complies with clauses (A), (B) and (C) of subsection (ii) hereof; or

               (ii)  consummation  after the Effective Date of a reorganization,
          merger  or  consolidation  or  sale  or  other  disposition  of all or
          substantially   all  of  the  assets  of  the  Company  (a  "Corporate
          Transaction")   in  each  case,   unless,   following  such  Corporate
          Transaction,  (A) (1) all or substantially all of the persons who were
          the  beneficial  owners of the  Outstanding  Common Stock  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more  than 50% of the then  outstanding  shares of common
          stock of the  corporation  resulting from such Corporate  Transaction,
          and  (2)  all or  substantially  all  of  the  persons  who  were  the
          beneficial  owners of the Outstanding  Voting  Securities  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more than 50% of the  combined  voting  power of the then
          outstanding  voting  securities  entitled  to  vote  generally  in the
          election of directors of the corporation resulting from such Corporate
          Transaction (including,  without limitation,  a corporation which as a
          result of such  transaction  owns the Company or all or  substantially
          all of the  Company's  assets  either  directly or through one or more
          subsidiaries) in substantially the same proportions as their ownership
          of the Outstanding  Common Stock and the Outstanding Voting Securities
          immediately prior to such Corporate  Transaction,  as the case may be,
          (B) no  Person  (excluding  (1) any  corporation  resulting  from such
          Corporate  Transaction or any employee benefit plan (or related trust)
          of the  Company  or such  corporation  resulting  from such  Corporate
          Transaction and (2) any Person approved by the members of the Board in
          office immediately prior to such Corporate  Transaction)  beneficially
          owns,  directly  or  indirectly,  50% or more of the then  outstanding
          shares  of  common  stock  of  the  corporation  resulting  from  such
          Corporate  Transaction  or the  combined  voting  power  of  the  then
          outstanding voting securities of such corporation except to the extent
          that such ownership  existed prior to such Corporate  Transaction  and
          (C) at least a majority  of the members of the board of  directors  of
          the corporation resulting from such Corporate Transaction were members
          of the Board at the time of the execution of the initial  agreement or
          of the action of the Board providing for such Corporate Transaction.
<PAGE>
     6.  Non-exclusivity  of Rights.  Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit,  bonus,
incentive  or  other  plan or  program  provided  by the  Company  or any of its
affiliated companies and for which the Executive may qualify, nor shall anything
herein limit or otherwise affect such rights as the Executive may have under any
stock  option or other  agreements  with the  Company  or any of its  affiliated
companies. Amounts which are vested benefits or which the Executive is otherwise
entitled  to  receive  under any plan or  program  of the  Company or any of its
affiliated  companies  at or  subsequent  to  the  date  of  termination  of the
Executive's  employment under this Agreement shall be payable in accordance with
such plan or program.

     7. Resolution of Disputes.

          (a)  Negotiation.  The parties  shall attempt in good faith to resolve
     any  dispute  arising  out of or  relating  to this  Agreement  promptly by
     negotiations  between the Executive and an executive officer of the Company
     who has authority to settle the  controversy.  Any party may give the other
     party  written  notice of any dispute not resolved in the normal  course of
     business.  Within 10 days  after the  effective  date of such  notice,  the
     Executive and an executive  officer of the Company shall meet at a mutually
     acceptable time and place within the Houston,  Texas metropolitan area, and
     thereafter as often as they reasonably deem necessary, to exchange relevant
     information  and to attempt to resolve the  dispute.  If the matter has not
     been resolved  within 30 days of the disputing  party's  notice,  or if the
     parties fail to meet within 10 days, either party may initiate  arbitration
     of the  controversy  or  claim as  provided  hereinafter.  If a  negotiator
     intends to be accompanied at a meeting by an attorney, the other negotiator
     shall be given at least three  business  days' notice of such intention and
     may also be accompanied by an attorney.  All negotiations  pursuant to this
     Section 7(a) shall be treated as compromise and settlement negotiations for
     the purposes of the federal and state rules of evidence and procedure.

          (b)  Arbitration.  Any  dispute  arising  out of or  relating  to this
     Agreement or the breach,  termination  or validity  thereof,  which has not
     been  resolved by  non-binding  means as provided in Section 7(a) within 60
     days of the  initiation  of such  procedure,  shall be  finally  settled by
     arbitration  conducted  expeditiously  in  accordance  with the  Center for
     Public Resources,  Inc. ("CPR") Rules for  Non-Administered  Arbitration of
     Business Disputes by three independent and impartial  arbitrators,  of whom
     each party shall appoint one,  provided that if one party has requested the
     other to participate in a non-binding procedure and the other has failed to
     participate,  the  requesting  party may  initiate  arbitration  before the
     expiration of such period.  Any such arbitration shall take place in Harris
     County,  Texas.  Any arbitrator not appointed by a party shall be appointed
     from the CPR Panels of Neutrals.  The arbitration  shall be governed by the
     United States  Arbitration Act and any judgment upon the award decided upon
     by the arbitrators may be entered by any court having jurisdiction thereof.
     Each party hereby  acknowledges that compensatory  damages include (without
     limitation) any benefit or right of indemnification  given by another party
     to the other under this Agreement.


<PAGE>



     8.  GOVERNING  LAW.  This  Agreement  shall be governed by and construed in
accordance with the internal laws of the State of Texas.  Venue and jurisdiction
of any act on relating to this agreement shall lie in Harris County, Texas.

     9.  Notice.  Any  notice,  payment,  demand or  communication  required  or
permitted  to  be  given  by  this  Agreement  shall  be  deemed  to  have  been
sufficiently given or served for all purposes if delivered personally or if sent
by registered or certified  mall,  return receipt  requested,  postage  prepaid,
addressed to such party at its address set forth below such party's signature to
this  Agreement or to such other address as shall have been furnished in writing
by such party for whom the  communication is intended.  Any such notice shall be
deemed to be given on the date so delivered.

     10.  Severability.  In the event any provisions hereof shall he modified or
held ineffective by any court, such adjudication  shall not invalidate or render
ineffective the balance of the provisions hereof:

     11.  Entire  Agreement.  This  Agreement,  together  with  the  Proprietary
Information and Inventions Agreement, constitutes the sole agreement between the
parties  with  respect to the  employment  of the  Executive  by the Company and
supersedes any and all other agreements, oral or written, between the parties.

     12.  Amendment  and waiver.  This  Agreement may not be modified or amended
except by a writing  signed by the  parties.  Any waiver or breach of any of the
terms of this  Agreement  shall not  operate as a waiver of any other  breach of
such  terms or  conditions,  or any  other  terms or  conditions,  nor shall any
failure to enforce any  provisions  hereof operate as a waiver of such provision
or any other provision hereof.

     13. Assignment.  This Agreement is a personal  employment  contract and the
rights and  interests of the Executive  hereunder may not be sold,  transferred,
assigned or pledged.  The Company may assign its rights under this  Agreement to
(i) any entity  into or with which the Company is merged or  consolidated  or to
which the Company  transfers all or substantially  all of its assets or (ii) any
entity, which at the time of such assignment,  controls, is under common control
with, or is  controlled  by the Company,  provided that the Company will require
any successor (whether direct or indirect, by purchase, merger, consolidation or
otherwise)  to all or  substantially  all of the business  and/or  assets of the
Company,  by  agreement  in form  and  substance  reasonably  acceptable  to the
Executive,  to expressly  assume and agree to perform this Agreement in the same
manner and to the same extent  that the Company  would be required to perform it
if not such succession had taken place.

     14.  Successors.  This  Agreement  shall be  binding  upon and inure to the
benefit of the  Executive  and his heirs,  executors,  administrators  and legal
representatives.  This Agreement  shall be binding upon and inure to the benefit
of the Company and its successors and assigns.

     15.  Section  Headings.  The section  headings in this  Agreement have been
inserted for convenience and shall not be used for  interpretive  purposes or to
otherwise construe this Agreement.



<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first written above and intend that this Agreement have the effect of a
sealed instrument.


                                           By: /S/PAUL A. COSSUM, Ph.D.
                                           ----------------------------
                                           Paul A. Cossum, Ph.D.


                                           ARONEX PHARMACEUTICALS, INC.

                                           By: /S/GEOFFREY F. COX, Ph.D.
                                           -----------------------------
                                           Geoffrey F. Cox Ph.D.
                                           Chief Executive Officer



                              EMPLOYMENT AGREEMENT


     This Employment Agreement (this "Agreement"), dated as of June 12, 1998, is
entered into by and between Aronex Pharmaceuticals, Inc., a Delaware corporation
(the "Company"), and Terance A. Murnane (the "Executive").

                                   WITNESSETH:

     WHEREAS  the Company  desires to employ the  Executive,  and the  Executive
desires  to  continue  in the  employment  of the  Company,  upon the  terms and
conditions and in the capacities set forth herein;

     NOW,  THEREFORE,  in  consideration  of the premises and for other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged, the Company and the Executive hereby agree as follows:

     1.  Employment and Term of Employment.  Subject to the terms and conditions
of this  Agreement,  the Company hereby agrees to employ the Executive,  and the
Executive hereby agrees to serve the Company,  as Controller and Secretary for a
term (the "Term of Employment") beginning on the date first set forth above (the
"Effective  Date") and ending on the Expiration Date (defined below). As used in
this Agreement,  "Expiration  Date" means the first anniversary of the Effective
Date,  provided  that on each  anniversary  of the  Effective  Date  (each  such
anniversary being referred to as a "Renewal Date"), the Expiration Date shall be
automatically  extended one additional year unless,  not less than 10 days prior
to the relevant  Renewal Date,  (i) either party shall have given written notice
to the other that no such automatic extension shall occur after the date of such
notice or (ii)  either  party  shall have given a Notice of  Termination  to the
other pursuant to Section 5 hereof.  Notwithstanding  the  foregoing,  if either
party gives a valid Notice of Termination pursuant to Section 5 hereof, the Term
of Employment  shall not extend beyond the  termination  date  specified in such
Notice of Termination.

     2. Scope of  Employment  (a) During the Term of  Employment,  the Executive
agrees to (i) serve as  Controller  and  Secretary of the Company and shall have
and may  exercise  all the  powers,  duties  and  functions  as are  normal  and
customary to such position and that are consistent with the responsibilities set
forth with respect to such  position in the  Company's  by-laws and (ii) perform
such other  duties not  inconsistent  with his  position as are assigned to him,
from time to time, by the Board of Directors  (the  "Board") or Chief  Executive
Officer of the  Company.  During the Term of  Employment,  the  Executive  shall
devote substantially all of his business time,  attention,  skill and efforts to
the faithful performance of his duties hereunder.

          (b) During the Term of Employment,  the Executive  agrees to serve, if
     elected,  as an officer or director of any  subsidiary  or affiliate of the
     Company so long as such service is commensurate  with the Employee's duties
     and responsibilities to the Company.

     3.  Compensation.  During the Term of Employment,  in  consideration of the
Executive's  services hereunder,  including,  without limitation,  service as an
officer or director of the Company or of any  subsidiary  or affiliate  thereof,
and in consideration of the Executive's  agreements set forth in the Proprietary
Information  and  Inventions  and  Non-Competition  Agreement  dated May 6, 1991
between  the  Executive  and  the  Company  (the  "Proprietary  Information  and
Inventions Agreement"):


<PAGE>



          (a) the Executive  shall receive a salary at a rate  equivalent to the
     Executive's  current annual salary in effect on the Effective Date (payable
     at such regular intervals as other employees of the Company are compensated
     in accordance with the Company's employment practices),  which salary shall
     be  subject  to review  annually  by the Board and may be  adjusted  at its
     discretion, provided that such salary may not be reduced at any time.

          (b) the Executive shall be entitled to receive an annual cash bonus of
     up to 20% of the  Executive's  salary  based upon the  achievement  of such
     milestones as may be agreed upon by the Executive and the Board.

     4. Additional Compensation and Benefits. (a) As additional compensation for
the Executive's services under this Agreement and the Executive's agreements set
forth in the Proprietary  Information and Inventions Agreement,  during the Term
of  Employment,  the Company  agrees to provide the Executive  with the non-cash
benefits provided by the Company to its other officers and key employees as they
may exist from time to time.  Such benefits shall include such leave or vacation
time (not less than three weeks),  medical and dental insurance,  life insurance
and other health care benefits,  and  retirement and disability  benefits as may
hereafter be provided by the Company in accordance with its policies, as well as
any  stock  option  plan or  similar  employee  benefit  program  for  which key
executives are or shall become eligible.

          (b) The Executive is authorized to incur reasonable  business expenses
     for  promoting  the  business  and  reputation  of the  Company,  including
     (without limitation) reasonable expenditures for travel, lodging, meals and
     client,  patron,  customer and/or  business  associate  entertainment.  The
     Company  shall  reimburse  the  Executive  within  30 days  for  reasonable
     expenses  incurred  by  the  Executive  in  furtherance  of  the  Company's
     business,  provided that such expenses are incurred in accordance  with the
     Company's  policies and upon  presentation of  documentation  in accordance
     with expense  reimbursement  policies of the Company as they may exist from
     time to time,  and submission to the Company of adequate  documentation  in
     accordance  with  federal  income  tax   regulations   and   administrative
     pronouncements.

     5. Termination.

          (a) General. The Executive's  employment hereunder shall automatically
     terminate on the earlier of his death or the Expiration Date. The Executive
     may, at any time prior to the  Expiration  Date,  terminate his  employment
     hereunder  for any reason by  delivering a Notice of  Termination  (defined
     below) to the Board.  The Company may, at any time prior to the  Expiration
     Date,  terminate  the  Executive's  employment  hereunder for any reason by
     delivering a Notice of Termination to the Executive. The giving of a notice
     pursuant to clause (i) of the proviso contained in the penultimate sentence
     of Section I hereof shall not be deemed a  termination  of the  Executive's
     employment  by the party  giving such  notice.  As used in this  Agreement,
     "Notice of Termination"  means a notice in writing  purporting to terminate
     the Executive's  employment in accordance with this Section 5, which notice
     shall (i) specify the effective date of such  termination (not prior to the
     date of such notice) and (ii) in the case of a  termination  by the Company
     for Cause or Disability or a termination by the Executive for Disability or
     Good  Reason (in each case as such terms are defined  below),  set forth in
     reasonable  detail  the  reason  for such  termination  and the  facts  and
     circumstances claimed to provide a basis for such termination.

          (b) Automatic  Termination on Expiration  Date or Death.  In the event
     the Executive's  employment hereunder shall automatically  terminate on the
     Expiration  Date or as a result of the  Executive's  death,  the  Executive
     shall only be entitled to receive, to the extent applicable, (i) all unpaid
     compensation  accrued  as of the  termination  date  pursuant  to Section 3
     hereof,  (ii) all unused  vacation  time accrued by the Executive as of the
     termination  date,  (iii) all amounts owing to the  Executive  underSection
     4(b)  hereof and (iv) those  benefits  under  Section 4 which are  required
     under the  Employee  Retirement  Income  Security  Act of 1974,  as amended
     ("ERISA"),  or other laws.  The amounts  described in clauses (i), (ii) and
     (iii) of the  foregoing  sentence  shall be paid to the Executive in a lump
     sum payment promptly after the Expiration Date.
<PAGE>
          (c)  Termination by Company for Cause.  If the Company  terminates the
     Executive's  employment  for Cause the Executive  shall only be entitled to
     receive the  compensation  and other  payments  described in paragraph  (b)
     above,  such  compensation  and  other  payments  to  be  paid  as  if  the
     Executive's  employment had automatically  terminated without the giving of
     any Notice of Termination.  As used in this  Agreement,  "Cause" shall mean
     (i) any material  failure of the Executive to perform his duties  specified
     in Section 2 of this Agreement (other than any such failure  resulting from
     the Executive's  incapacity due to Disability) after written notice of such
     failure has been given to the Executive by the Board or the Company's Chief
     Executive  Officer and such failure shall have  continued for 30 days after
     receipt of such notice,  (ii) gross  negligence  or willful or  intentional
     wrongdoing or misconduct,  (iii) a material  breach by the Executive of the
     Proprietary  Information  and Inventions and  Non-Competition  Agreement of
     even date herewith  between the Executive and the Company or any subsequent
     such agreement between the Executive and the Company, or (iv) conviction of
     the Executive of a felony offense or a crime involving moral turpitude.

          (d)  Termination  for  Disability.   To  provide  for  the  event  the
     Executive's employment is terminated by either the Company or the Executive
     on account of Disability  (defined below), the Company shall provide or, as
     applicable,   cause  its  disability  insurance  carrier  to  provide,  the
     Executive  such  disability  benefits as may  hereafter  be provided by the
     Company in  accordance  with its  policies,  as they may exist from time to
     time. As used herein,  "Disability"  means any physical or mental condition
     of the Executive that (i) prevents the Executive from being able to perform
     the services required under this Agreement, (ii) has continued for at least
     180  consecutive  days during any 12-month  period and (iii) is  reasonably
     expected to continue.

          (e) Termination by Company  Without Cause.  If the Company  terminates
     the  Executive's  employment  for any  reason  other  than for  Cause or on
     account of Disability, the Company shall:

               (i) pay to the Executive,  for the period of 12 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above; and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the  Company  shall be required  to provide  benefits  under the
          Consolidated  Omnibus  Budget  Reconciliation  Act of  1985  ('COBRA")
          following the date of such termination).

          (f)  Termination by the Executive  with Good Reason.  If the Executive
     terminates his employment for Good Reason (as defined  below),  the Company
     shall:





<PAGE>
               (i) pay to the Executive,  for the period of 24 months commencing
          on the date of such  termination,  an amount equal to the  Executive's
          then current annual salary  (payable at such regular  intervals as the
          employees  of the  Company  are  compensated  in  accordance  with the
          Company's employment practices);

               (ii)  pay the  Executive  the  compensation  and  other  payments
          described in paragraph (b) above; and

               (iii)  continue,  for the period of 12 months  commencing  on the
          date of such  termination,  to provide the  benefits  contemplated  by
          Section 4(a) of this Agreement (provided that the continuation of such
          benefits  shall be  construed  so as not to extend the  period  during
          which the Company  shall be required to provide  benefits  under COBRA
          following the date of such termination).

As used in this Agreement, "Good Reason" shall mean a material diminution in the
title,  powers,  duties,  responsibilities  or  functions  of the  Executive  as
described in Section 2 hereof  within one year  following  the  occurrence  of a
Change of Control.

As used in this Agreement, a "Change of Control" shall mean:

               (i) the  acquisition  after the Effective Date by any individual,
          entity or group (within the meaning of Section 13(d)(3) or 14(d)(2) of
          the  Securities  Exchange  Act of 1934,  as amended) (a  "Person")  of
          beneficial ownership of 50% or more of either (i) the then outstanding
          shares of common stock of the Company (the "Outstanding Common Stock")
          or (ii) the  combined  voting  power of the  then  outstanding  voting
          securities of the Company  entitled to vote  generally in the election
          of directors (the "Outstanding Voting Securities"),  provided that for
          purposes of this subsection (i), the following  acquisitions shall not
          constitute a Change of Control:  (A) any acquisition directly from the
          Company,  (B) any  acquisition by the Company,  (C) any acquisition by
          any employee  benefit plan (or related trust)  sponsored or maintained
          by the Company or any  corporation  controlled by the Company,  or (D)
          any  acquisition by any  corporation  pursuant to a transaction  which
          complies with clauses (A), (B) and (C) of subsection (ii) hereof; or

               (ii)  consummation  after the Effective Date of a reorganization,
          merger  or  consolidation  or  sale  or  other  disposition  of all or
          substantially   all  of  the  assets  of  the  Company  (a  "Corporate
          Transaction")   in  each  case,   unless,   following  such  Corporate
          Transaction,  (A) (1) all or substantially all of the persons who were
          the  beneficial  owners of the  Outstanding  Common Stock  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more  than 50% of the then  outstanding  shares of common
          stock of the  corporation  resulting from such Corporate  Transaction,
          and  (2)  all or  substantially  all  of  the  persons  who  were  the
          beneficial  owners of the Outstanding  Voting  Securities  immediately
          prior to such  Corporate  Transaction  beneficially  own,  directly or
          indirectly,  more than 50% of the  combined  voting  power of the then
          outstanding  voting  securities  entitled  to  vote  generally  in the
          election of directors of the corporation resulting from such Corporate
          Transaction (including,  without limitation,  a corporation which as a
          result of such  transaction  owns the Company or all or  substantially
          all of the  Company's  assets  either  directly or through one or more
          subsidiaries) in substantially the same proportions as their ownership
          of the Outstanding  Common Stock and the Outstanding Voting Securities
          immediately prior to such Corporate  Transaction,  as the case may be,
          (B) no  Person  (excluding  (1) any  corporation  resulting  from such
          Corporate  Transaction or any employee benefit plan (or related trust)
          of the  Company  or such  corporation  resulting  from such  Corporate
          Transaction and (2) any Person approved by the members of the Board in
          office immediately prior to such Corporate  Transaction)  beneficially
          owns,  directly  or  indirectly,  50% or more of the then  outstanding
          shares  of  common  stock  of  the  corporation  resulting  from  such
          Corporate  Transaction  or the  combined  voting  power  of  the  then
          outstanding voting securities of such corporation except to the extent
          that such ownership  existed prior to such Corporate  Transaction  and
          (C) at least a majority  of the members of the board of  directors  of
          the corporation resulting from such Corporate Transaction were members
          of the Board at the time of the execution of the initial  agreement or
          of the action of the Board providing for such Corporate Transaction.
<PAGE>
     6.  Non-exclusivity  of Rights.  Nothing in this Agreement shall prevent or
limit the Executive's continuing or future participation in any benefit,  bonus,
incentive  or  other  plan or  program  provided  by the  Company  or any of its
affiliated companies and for which the Executive may qualify, nor shall anything
herein limit or otherwise affect such rights as the Executive may have under any
stock  option or other  agreements  with the  Company  or any of its  affiliated
companies. Amounts which are vested benefits or which the Executive is otherwise
entitled  to  receive  under any plan or  program  of the  Company or any of its
affiliated  companies  at or  subsequent  to  the  date  of  termination  of the
Executive's  employment under this Agreement shall be payable in accordance with
such plan or program.

     7. Resolution of Disputes.

     (a)  Negotiation.  The parties  shall  attempt in good faith to resolve any
dispute  arising out of or relating to this Agreement  promptly by  negotiations
between the Executive and an executive  officer of the Company who has authority
to settle the controversy.  Any party may give the other party written notice of
any dispute not resolved in the normal course of business.  Within 10 days after
the effective date of such notice,  the Executive and an executive of officer of
the  Company  shall  meet at a  mutually  acceptable  time and place  within the
Houston,  Texas  metropolitan  area, and thereafter as often as they  reasonably
deem necessary,  to exchange relevant  information and to attempt to resolve the
dispute.  If the matter has not been  resolved  within 30 days of the  disputing
party's notice,  or if the parties fail to meet within 10 days, either party may
initiate arbitration of the controversy or claim as provided  hereinafter.  If a
negotiator  intends to be  accompanied  at a meeting by an  attorney,  the other
negotiator shall be given at least three business days, notice of such intention
and may also be accompanied by an attorney.  All  negotiations  pursuant to this
Section 7(a) shall be treated as compromise and settlement  negotiations for the
purposes of the federal and state rules of evidence and procedure.

     (b)  Arbitration.  Any dispute arising out of or relating to this Agreement
or the breach,  termination or validity thereof,  which has not been resolved by
non-binding  means as provided in Section 7(a) within 60 days of the  initiation
of  such  procedure,   shall  be  finally   settled  by  arbitration   conducted
expeditiously in accordance with the Center for Public  Resources,  Inc. ("CPR")
Rules  for  Non-Arbitration  of  Business  Disputes  by  three  independent  and
impartial  arbitrators,  of whom each party shall appoint one,  provided that if
one party has requested the other to participate in a non-binding  procedure and
the  other  has  failed  to  participate,  the  requesting  party  may  initiate
arbitration  before the expiration of such period.  Any such  arbitration  shall
take place in Harris  County,  Texas.  Any  arbitrator  not appointed by a party
shall be appointed  from the CPR Panels of Neutrals.  The  arbitration  shall be
governed by the United  States  Arbitration  Act and any judgment upon the award
decided upon by the arbitrators may be entered by any court having  jurisdiction
thereof.  Each party  hereby  acknowledges  that  compensatory  damages  include
(without  limitation) any benefit or right of  indemnification  given by another
party to the other under this Agreement.




<PAGE>



     8.  GOVERNING  LAW.  This  Agreement  shall be governed by and construed in
accordance with the internal laws of the State of Texas.  Venue and jurisdiction
of any act on relating to this agreement shall lie in Harris County, Texas.

     9.  Notice.  Any  notice,  payment,  demand or  communication  required  or
permitted  to  be  given  by  this  Agreement  shall  be  deemed  to  have  been
sufficiently given or served for all purposes if delivered personally or if sent
by registered or certified  mall,  return receipt  requested,  postage  prepaid,
addressed to such party at its address set forth below such party's signature to
this  Agreement or to such other address as shall have been furnished in writing
by such party for whom the  communication is intended.  Any such notice shall be
deemed to be given on the date so delivered.

     10.  Severability.  In the event any provisions hereof shall he modified or
held ineffective by any court, such adjudication  shall not invalidate or render
ineffective the balance of the provisions hereof.

     11.  Entire  Agreement.  This  Agreement,  together  with  the  Proprietary
Information and Inventions Agreement, constitutes the sole agreement between the
parties  with  respect to the  employment  of the  Executive  by the Company and
supersedes any and all other agreements, oral or written, between the parties.

     12.  Amendment  and Waiver.  This  Agreement may not be modified or amended
except by a writing  signed by the  parties.  Any waiver or breach of any of the
terms of this  Agreement  shall not  operate as a waiver of any other  breach of
such  terms or  conditions,  or any  other  terms or  conditions,  nor shall any
failure to enforce any  provisions  hereof operate as a waiver of such provision
or any other provision hereof.

     13. Assignment.  This Agreement is a personal  employment  contract and the
rights and  interests of the Executive  hereunder may not be sold,  transferred,
assigned or pledged.  The Company may assign its rights under this  Agreement to
(i) any entity  into or with which the Company is merged or  consolidated  or to
which the Company  transfers all or substantially  all of its assets or (ii) any
entity, which at the time of such assignment,  controls, is under common control
with, or is  controlled  by the Company,  provided that the Company will require
any successor (whether direct or indirect, by purchase, merger, consolidation or
otherwise)  to all or  substantially  all of the business  and/or  assets of the
Company,  by  agreement  in form  and  substance  reasonably  acceptable  to the
Executive,  to expressly  assume and agree to perform this Agreement in the same
manner and to the same extent  that the Company  would be required to perform it
if not such succession had taken place.

     14.  Successors.  This  Agreement  shall be  binding  upon and inure to the
benefit of the  Executive  and his heirs,  executors,  administrators  and legal
representatives.  This Agreement  shall be binding upon and inure to the benefit
of the Company and its successors and assigns.

     15.  Section  Headings.  The section  headings in this  Agreement have been
inserted for convenience and shall not be used for  interpretive  purposes or to
otherwise construe this Agreement.





<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto have executed this Agreement as of
the date first written above and intend that this Agreement have the effect of a
sealed instrument.

                                            By:/S/TERANCE A. MURNANE
                                            ------------------------
                                            Terance A. Murnane



                                            ARONEX PHARMACEUTICALS, INC.


                                            By:/S/GEOFFREY F. COX, Ph.D.
                                            ----------------------------
                                            Geoffrey F. Cox, Ph.D.







                          ARONEX PHARMACEUTICALS, INC.

                                                                    Exhibit 11.1

              Statement Regarding Computation of Per Share Earnings

The following  reflects the information used in calculating the number of shares
in the  computation  of net loss per share for each of the  periods set forth in
the Statement of Operations.

<TABLE>
<CAPTION>

                                                                                               Average
                                                     Days            Shares                    Shares                       Loss Per
                                     Shares      Outstanding         X Days                  Outstanding         Loss         Share

<S>                   <C> <C>        <C>              <C>            <C>        
Six Months Ended June 30, 1997:      14,597,247       8              116,777,976
                                     14,606,972       12             175,283,664
                                     14,612,023       4               58,448,092
                                     14,612,499       21             306,862,479
                                     14,615,983       6               87,695,898
                                     14,616,981       1               14,616,981
                                     14,624,239       5               73,121,195
                                     14,625,111       2               29,250,222
                                     14,627,695       7              102,393,865
                                     14,628,567       6               87,771,402
                                     14,640,311       6               87,841,866
                                     14,643,658       6               87,861,948
                                     14,644,672       1               14,644,672
                                     14,644,816       7              102,513,712
                                     14,644,982       2               29,289,964
                                     14,645,277       4               58,581,108
                                     14,665,277       22             322,636,094
                                     14,665,665       9              131,990,985
                                     14,674,453       19             278,814,607
                                     14,678,042       6               88,068,252
                                     14,680,055       7              102,760,385
                                     14,680,344       19             278,926,536
                                     14,687,394       1               14,687,394
<S>                                                  <C>           <C>                 <C>      <C>             <C>             <C>
                                                     181           2,650,839,297      /181      14,645,521      (6,294,000)   (0.43)


Six Months Ended June 30, 1998:      15,459,166       11             170,050,826
                                     15,460,684       71           1,097,708,564
                                     15,465,729       1               15,465,729
                                     15,467,281       98           1,515,793,538
                                     15,497,443       1               15,497,443
                                                     182           2,814,516,100      /182      15,464,374     (10,487,000)   (0.68)


Quarter Ended June 30, 1997:         14,644,816       2               29,289,632
                                     14,644,982       2               29,289,964
                                     14,645,277       4               58,581,108
                                     14,665,277       22             322,636,094
                                     14,665,665       9              131,990,985
                                     14,674,453       19             278,814,607
                                     14,678,042       6               88,068,252
                                     14,680,055       7              102,760,385
                                     14,680,344       19             278,926,536
                                     14,687,394       1               14,687,394
                                                      91           1,335,044,957       /91      14,670,824      (3,201,000)   (0.22)

Quarter Ended June 30, 1998:         15,467,281       91           1,407,522,571
                                     15,497,443       1               15,497,443
                                                      92          1,423,020,014        /92      15,467,609      (5,576,000)   (0.36)
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>


                                                    

                                      FINANCIAL DATA SCHEDULE


                                   ARONEX PHARMACEUTICALS, INC.     Exhibit 27.1
<ARTICLE>                                                                      5
<LEGEND>                THIS SCHEDULE  CONTAINS  SUMMARY  FINANCIAL  INFORMATION
                    EXTRACTED   FROM  THE   FINANCIAL   STATEMENTS   OF   ARONEX
                    PHARMACEUTICALS,  INC. SET FORTH IN THE COMPANY'S  FORM 10-Q
                    FOR THE SIX MONTHS  ENDED JUNE 30, 1998 AND IS  QUALIFIED IN
                    ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                                   1
       
<S>                                                                          <C>
<PERIOD-TYPE>                                                              6-MOS
<FISCAL-YEAR-END>                                                    DEC-31-1998
<PERIOD-END>                                                         JUN-30-1998
<CASH>                                                                 6,265,000
<SECURITIES>                                                          14,966,000
<RECEIVABLES>                                                                  0
<ALLOWANCES>                                                                   0
<INVENTORY>                                                                    0
<CURRENT-ASSETS>                                                      20,496,000
<PP&E>                                                                 4,780,000
<DEPRECIATION>                                                         2,619,000
<TOTAL-ASSETS>                                                        24,166,000
<CURRENT-LIABILITIES>                                                  5,842,000
<BONDS>                                                                        0
<COMMON>                                                                  15,000
                                                          0
                                                                    0
<OTHER-SE>                                                            17,212,000
<TOTAL-LIABILITY-AND-EQUITY>                                          24,166,000
<SALES>                                                                        0
<TOTAL-REVENUES>                                                         941,000
<CGS>                                                                          0
<TOTAL-COSTS>                                                                  0 
<OTHER-EXPENSES>                                                      11,414,000
<LOSS-PROVISION>                                                               0
<INTEREST-EXPENSE>                                                        14,000
<INCOME-PRETAX>                                                     (10,487,000)
<INCOME-TAX>                                                                   0
<INCOME-CONTINUING>                                                 (10,487,000)
<DISCONTINUED>                                                                 0
<EXTRAORDINARY>                                                                0
<CHANGES>                                                                      0
<NET-INCOME>                                                        (10,487,000)
<EPS-PRIMARY>                                                              (.68)
<EPS-DILUTED>                                                              (.68)
        


</TABLE>


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