ARONEX PHARMACEUTICALS INC
DEF 14A, 1999-10-05
PHARMACEUTICAL PREPARATIONS
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<PAGE>   1
                            SCHEDULE 14A INFORMATION


PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934


Filed by the Registrant [X]

Filed by a Party other than the Registrant [ ]

Check the appropriate box:

[ ]   Preliminary Proxy Statement

[ ]   Confidential, for Use of the Commission Only (as permitted by Rule
      14a-6(e)(2))

[X]   Definitive Proxy Statement

[ ]   Definitive Additional Materials

[ ]   Soliciting Material Pursuant to ss. 240.14a-11(c) or  ss. 240.14a-12

                          ARONEX PHARMACEUTICALS, INC.
                ------------------------------------------------
                (NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

     -----------------------------------------------------------------------
     (NAME OF PERSON(S) FILING PROXY STATEMENT IF OTHER THAN THE REGISTRANT)

Payment of Filing Fee (Check the appropriate box):

[X]   No fee required.

[ ]   Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

      1)     Title of each class of securities to which transaction applies:

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

      2)     Aggregate number of securities to which transaction applies:

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

      3)     Per unit price or other underlying value of transaction computed
             pursuant to Exchange Act Rule 0-11 (Set forth the amount on which
             the filing fee is calculated and state how it was determined):

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      4)     Proposed maximum aggregate value of transaction:

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

      5)     Total fee paid:

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[ ]   Fee paid previously with preliminary materials.

[ ]   Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the Form or Schedule and the date of its filing.

      1)     Amount Previously Paid:

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

      2)     Form, Schedule or Registration Statement No.:

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

      3)     Filing Party:

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

      4)     Date Filed:

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



<PAGE>   2




                          ARONEX PHARMACEUTICALS, INC.
                          8707 TECHNOLOGY FOREST PLACE
                         THE WOODLANDS, TEXAS 77381-1191

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



                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                             TO BE HELD MAY 11, 1999


To the Stockholders of Aronex Pharmaceuticals, Inc.:

         WHEN AND WHERE. The 1999 Annual Meeting of Stockholders of Aronex
Pharmaceuticals, Inc. will be held on Tuesday, May 11, 1999, at 1:30 p.m., local
time, in the Willow Room of The Houstonian Hotel, 111 North Post Oak Lane,
Houston, Texas.

         RECORD DATE. Only stockholders of record at the close of business on
March 19, 1999 will be entitled to notice of and to vote at the Annual Meeting.

         PURPOSE OF THE MEETING. The Annual Meeting has been called for the
following purposes:

                  1. To elect two Class III directors of the company, each to
         serve until the company's 2002 Annual Meeting of Stockholders or until
         their respective successors have been duly elected and qualified;

                  2. To vote upon a proposal to approve and adopt the amendment
         to the company's Certificate of Incorporation to increase the
         authorized number of shares of common stock from 30,000,000 to
         40,000,000;

                  3. To ratify and approve the appointment of Arthur Andersen
         LLP as the company's independent public accountants for its fiscal year
         ending December 31, 1999; and

                  4. To act upon such other business as may properly come before
         the meeting or any adjournments thereof.

         You will find more information on the nominees for director and the
proposals in the proxy statement. You will find further instructions on how to
vote beginning on page 2 of the proxy statement.

         YOUR VOTE COUNTS! IT IS IMPORTANT THAT YOUR SHARES BE REPRESENTED AT
THE ANNUAL MEETING REGARDLESS OF WHETHER YOU PLAN TO ATTEND. PLEASE MARK, SIGN
AND DATE THE ENCLOSED PROXY CARD AND RETURN IT IN THE ENVELOPE PROVIDED AS
PROMPTLY AS POSSIBLE. YOU MAY REVOKE YOUR PROXY AT ANY TIME BEFORE IT IS VOTED.




                                          By Order of the Board of Directors,

                                          /s/ TERANCE A. MURNANE
                                          --------------------------------------
                                          Terance A. Murnane
                                          Secretary

The Woodlands, Texas
April 5, 1999


<PAGE>   3




                          ARONEX PHARMACEUTICALS, INC.
                          8707 TECHNOLOGY FOREST PLACE
                         THE WOODLANDS, TEXAS 77381-1191

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


                                 PROXY STATEMENT
                                       FOR
                         ANNUAL MEETING OF STOCKHOLDERS

                             TO BE HELD MAY 11, 1999

<TABLE>
<CAPTION>

CONTENTS OF 1999 PROXY STATEMENT                                                                               PAGE
                                                                                                               ----
<S>                                                                                                              <C>

VOTING INFORMATION

         General Instructions on How to Vote Your Proxy...........................................................2
         Voting Rules.............................................................................................3


PROPOSALS

         Proposal 1: Election of Directors........................................................................5
         Proposal 2: Amendment to Certificate of Incorporation....................................................6
         Proposal 3: Appointment of Independent Accountants.......................................................7


COMPANY INFORMATION

         Information about Current and Continuing Directors.......................................................8
         Directors' Meetings and Compensation....................................................................10
         Board Committees and Their Functions....................................................................10
         Report of the Compensation Committee....................................................................11
         Executive Compensation..................................................................................12
         Transactions with Certain Affiliates....................................................................17
         Stock Ownership by the Company's Largest Stockholders and Management....................................18
         Compliance with Section 16(a)...........................................................................20
         Stockholder Proposals for the 2000 Annual Meeting.......................................................20
         Discretionary Voting of Proxies on Other Matters........................................................20
         1998 Form 10-K..........................................................................................21
</TABLE>

The principal executive offices of the company are located at 8707 Technology
Forest Place, The Woodlands, Texas 77381-1191. This proxy statement, and the
accompanying Notice of 1999 Annual Meeting of Stockholders and proxy card, are
first being mailed to the company's stockholders on or about April 5, 1999.


<PAGE>   4
                               VOTING INFORMATION

GENERAL INSTRUCTIONS ON HOW TO VOTE YOUR PROXY --

         Below are instructions on how to vote, as well as information on your
rights as a stockholder as they relate to voting. Some of the instructions will
differ depending on how your stock is held. It is important to follow the
instructions that apply to your situation.

         IF YOUR SHARES ARE HELD IN "STREET NAME," you should vote your shares
in the method directed by your broker or other nominee.

         IF YOU PLAN TO ATTEND THE MEETING AND VOTE IN PERSON, your instructions
will depend on how your shares are held:

         o     Shares registered in your name -- check the appropriate box on
               the enclosed proxy card and bring evidence of your stock
               ownership with you to the meeting. The proxy card and the
               evidence of your ownership will serve as your authorization to
               vote in person.

         o     Shares registered in the name of your broker or other nominee --
               ask your broker to provide you with a broker's proxy card in your
               name (which will allow you to vote your shares in person at the
               meeting) and bring evidence of your stock ownership from your
               broker.

Remember that attendance at the meeting will be limited to stockholders as of
the record date (or their authorized representatives) with evidence of their
share ownership and guests of the company.

         HOW TO REVOKE YOUR PROXY. If your shares are registered in your name,
you may revoke your proxy at any time before it is exercised by:

         o     filing with the Secretary of the company a written notice
               revoking it,

         o     executing and returning another proxy bearing a later date, or

         o     attending the Annual Meeting and expressing a desire to vote your
               shares of common stock in person.

         If your shares are held in street name, you must contact your broker to
revoke your proxy. Written notices to the company must be addressed to
Secretary, Aronex Pharmaceuticals, Inc., 8707 Technology Forest Place, The
Woodlands, Texas 77381-1191. No revocation by written notice will be effective
unless such notice has been received by the Secretary of the company prior to
the day of the Annual Meeting or by the inspector of election at the Annual
Meeting.


                                      -2-

<PAGE>   5




VOTING RULES --

         STOCKHOLDERS ENTITLED TO VOTE - THE RECORD DATE. The close of business
on March 19, 1999 has been fixed as the record date for the determination of
stockholders entitled to vote at the Annual Meeting and any adjournment(s)
thereof. As of the record date, the company had issued and outstanding
22,463,211 shares of common stock and no shares of the company's preferred
stock.

         QUORUM REQUIRED. A quorum must exist for us to hold the Annual Meeting.
For a quorum to exist, we will need the presence, either in person or by proxy,
of holders of a majority of the outstanding shares of the company's common stock
as of the record date. Abstentions and broker non-votes are counted for purposes
of determining whether a quorum is present. Broker non-votes occur when a
beneficial owner indicates on the proxy that some of the shares represented are
not being voted as to certain proposals, and the broker is not permitted to vote
on the proposal.

         NUMBER OF VOTES. You are entitled to one vote per share of the
company's common stock that you own as of the record date on each matter that is
called to vote at the Annual Meeting.

         VOTING TO ELECT DIRECTORS. When voting to elect directors, you have
three options:

         o     Vote for each of the two nominees;

         o     Vote for only one of the nominees; or

         o     Withhold authority to vote for all of the nominees.

         If a quorum is present at the Annual Meeting, the two persons receiving
the greatest number of votes will be elected to serve as directors. Because of
this rule, any shares that are not voted or whose votes are withheld will not
influence the outcome of the election of directors.

         VOTING ON OTHER MATTERS. When voting on all other matters, you will
also have three options, but these options are different from those pertaining
to the election of directors:

         o     Vote FOR a given proposal;

         o     Vote AGAINST a given proposal; or

         o     ABSTAIN from voting on a given proposal.

         Each matter other than the election of directors requires the
affirmative vote of a majority of the shares present or represented at the
Annual Meeting and entitled to vote on the proposal. An abstention will have the
same effect as voting against a proposal. Non-voted shares will not affect the
results on a proposal, because shares held by brokers who withhold authority to
vote will be considered absent in the voting tallies on these proposals.

         The proxy confers discretionary authority to the persons named in the
proxy authorizing those persons to vote, in their discretion, on any other
matters properly presented at the Annual Meeting. The Board of Directors is not
currently aware of any such other matters.


                                       -3-

<PAGE>   6




         VOTING OF PROXIES WITH UNMARKED VOTES. All proxies that are properly
completed, signed and returned prior to the Annual Meeting will be voted. If you
return your proxy with no votes marked, your shares will be voted as follows:

         o     FOR the election of all two nominees for director.

         o     FOR the amendment to the Certificate of Incorporation to increase
               the authorized number of shares of common stock.

         o     FOR the appointment of Arthur Andersen LLP as the company's
               independent public accountants.

         It is possible for a proxy to indicate that some of the shares
represented are not being voted as to certain proposals. This occurs, for
example, when a broker is not permitted to vote on a proposal without
instructions from the beneficial owner of the stock. In these cases, non-voted
shares are considered absent for those proposals.

         WHO COUNTS THE VOTES. Votes will be counted by American Stock Transfer
& Trust Company, the company's transfer agent and registrar.

         INFORMATION ABOUT THIS SOLICITATION OF PROXIES. The solicitation of the
proxy accompanying this statement is being made by the company's Board of
Directors in connection with the 1999 Annual Meeting of Stockholders. In
addition to the solicitation of proxies by use of this proxy statement,
directors, officers and employees of Aronex Pharmaceuticals may solicit the
return of proxies by mail, personal interview, telephone or telegraph. Officers
and employees of the company will not receive additional compensation for their
solicitation efforts, but they will be reimbursed for any out-of-pocket expenses
incurred. Brokerage houses and other custodians, nominees and fiduciaries will
be requested, in connection with the stock registered in their names, to forward
solicitation materials to the beneficial owners of such stock.

         All costs of preparing, printing, assembling and mailing the Notice of
the 1999 Annual Meeting of Stockholders, this proxy statement, the enclosed form
of proxy card and any additional materials, as well as the cost of forwarding
solicitation materials to the beneficial owners of stock and all other costs of
solicitation, will be borne by Aronex Pharmaceuticals.


                                       -4-

<PAGE>   7




                                    PROPOSALS

PROPOSAL NUMBER 1: ELECTION OF DIRECTORS

         The company's Restated Certificate of Incorporation divides or
"classifies" the company's Board of Directors into three classes (Classes I, II
and III), with respect to the time for which the directors in each class
individually hold office. Each class consists, as nearly as possible, of
one-third of the entire Board. The company's Board of Directors is currently
fixed at six members. Each director is elected to hold office for a term ending
on the date of the third annual meeting following the annual meeting at which
such director was elected. The current term for Class III Directors will expire
at the Annual Meeting. The current terms for Class I and Class II Directors will
expire at the 2001 and 2000 Annual Meetings of Stockholders, respectively.

         The Board of Directors has nominated and urges you to vote for the
election of the two nominees identified below to serve as Class III directors
for a three-year term or until their successors are duly elected and qualified.
Each of the nominees listed below is a member of the company's present Board of
Directors. Proxies solicited hereby will be voted for both nominees unless
stockholders specify otherwise in their proxies.

         If, at the time of or prior to the Annual Meeting, any of the nominees
should be unable or decline to serve, the discretionary authority provided in
the proxy may be used to vote for a substitute or substitutes designated by the
Board of Directors. The Board of Directors has no reason to believe that any
substitute nominee or nominees will be required.

NOMINEES FOR DIRECTOR

         The two nominees for election as Class III directors and certain
additional information with respect to each of them, are as follows:

<TABLE>
<CAPTION>

                                                                                                     YEAR FIRST
                NAME                      AGE             POSITION WITH THE COMPANY               BECAME A DIRECTOR
                ----                      ---             -------------------------               -----------------

<S>                                       <C>             <C>                                      <C>
James R. Butler......................     58                Director (Class III)                        1997
Gregory F. Zaic......................     51                Director (Class III)                        1995
</TABLE>

         James R. Butler has served as a member of the Board of Directors since
June 1997. Mr. Butler is Senior Vice President, Sales and Marketing for ALZA
Corporation, a California-based pharmaceutical company developing therapeutics
using its proprietary drug delivery systems. Mr. Butler has overseen ALZA
Pharmaceuticals since August 1993. ALZA Pharmaceuticals has responsibility for
domestic sales and marketing, government affairs, ex-U.S. commercialization of
ALZA products, new product planning, and ALZA scientific. ALZA scientific is
responsible for all aspects of the ALZA product line. Prior to joining ALZA in
1993, Mr. Butler was Vice President and General Manager of Glaxo Inc.'s
Corporate Division. Mr. Butler held numerous sales and marketing positions
during his 23- year tenure at Glaxo.

         Gregory F. Zaic has served as a member of the Board of Directors since
September 1995. Mr. Zaic has been an investor primarily focused on medical and
life science investment opportunities since 1983. He currently is a General
Partner of Prince Ventures and has served as acting president and director of
many private and public companies, including GenVec, Inc., Thiktillos, Inc. and
Xylos Corporation. Before his investment career, Mr. Zaic served in several
financial, technical, and operational capacities, including heading the Special
Products Division of Baxter, a manufacturer of custom medical devices for the
cardiopulmonary and intravenous solution administration markets.

         THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE "FOR" THE
ELECTION OF EACH OF THE ABOVE-NAMED NOMINEES.

                                       -5-

<PAGE>   8




PROPOSAL NUMBER 2: INCREASE OF AMOUNT OF AUTHORIZED COMMON STOCK

         The Board of Directors has approved and determined to submit to Aronex
Pharmaceuticals' stockholders a proposal to amend the Amended and Restated
Certificate of Incorporation ("Articles") to increase the number of authorized
shares of common stock from 30,000,000 to 40,000,000 shares. As of March 31,
1999, there were issued and outstanding 22,494,671 shares of common stock.

         The Board of Directors of Aronex Pharmaceuticals is of the opinion that
the present balance of shares of common stock available for issuance is
insufficient to enable Aronex Pharmaceuticals to provide for its employee stock
option plans and to allow it to take advantage of business opportunities, such
as acquisitions and subsequent financings, that may arise. On April 4, 1997, at
the Annual Meeting of stockholders, the stockholders approved a decrease in
authorized shares of common stock from 75,000,000 to 30,000,000. Since that
time, Aronex Pharmaceuticals has issued 7,829,454 shares resulting mainly from
financings and the exercise of warrants and options (including the issuance of
6,000,000 shares in February 1999 in a registered public offering). The issuance
of these shares has reduced the number of shares of Aronex Pharmaceuticals
common stock available for future transactions, stock splits, and issuances
under stock purchase and option plans. The increase in authorized shares would
give Aronex Pharmaceuticals the flexibility to take advantage of various
business opportunities, including acquisitions, financings, stock splits and
stock dividends, the sale of shares of common stock in the open market or
otherwise, for other corporate purposes, as well as providing for future
employee stock option and purchase plans.

         Authorized but unissued shares may be issued at some later date upon
authorization by the Aronex Pharmaceuticals' Board of Directors, except as may
be limited by the Articles, bylaw, or by the rules of the Nasdaq National
Market. The holders of shares of Aronex Pharmaceuticals common stock are not
entitled to preemptive rights to purchase or have offered to them any shares of
common stock whether now or hereafter authorized. Although the proposed
amendment would increase the number of shares of common stock available for
issuance, the directors currently have the authority described above and the
amendment would not increase the authority of the Board to take such actions.
The Board has no present plans to issue shares of common stock for such
purposes.

         The Board of Directors believes that an increase in the number of
authorized shares of common stock would not significantly impact any attempt to
gain control of Aronex Pharmaceuticals. It is possible, however, that the
availability of authorized but unissued shares of common stock could discourage
third parties from attempting to gain such control since the Board could
authorize the issuance of shares of common stock in a private placement or
otherwise to one or more persons. Such an issuance of shares of common stock
could dilute the voting power of a person attempting to acquire control of
Aronex Pharmaceuticals, increase the cost of acquiring such control, affect the
accounting treatment thereof or otherwise hinder such efforts.

         It is proposed that Article IV, Section A, of the company's Amended and
Restated Certificate of Incorporation, be amended to read as follows:

                  A. Classes of Stock

                  The number of shares of all classes of capital stock that the
         Corporation shall be authorized to issue is 45,000,000 shares, divided
         into the following: 5,000,000 shares of preferred stock, par value
         $.001 per share ("Preferred Stock"), and (ii) 40,000,000 shares of
         common stock, par value $.001 per share ("Common Stock").

         THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE "FOR" THE
         AMENDMENT TO THE COMPANY'S AMENDED AND RESTATED CERTIFICATION OF
         INCORPORATION.


                                       -6-

<PAGE>   9





PROPOSAL NUMBER 3: RATIFICATION AND APPROVAL OF INDEPENDENT PUBLIC ACCOUNTANTS

         The Board of Directors has appointed the firm of Arthur Andersen LLP as
the company's independent public accountants to make an examination of the
accounts of the company for the fiscal year ending December 31, 1999, subject to
ratification by the company's stockholders. Representatives of Arthur Andersen
LLP will be present at the Annual Meeting and will have an opportunity to make a
statement, if they desire to do so. They will also be available to respond to
appropriate questions from stockholders attending the Annual Meeting.

         THE BOARD OF DIRECTORS RECOMMENDS THAT STOCKHOLDERS VOTE "FOR"
RATIFICATION AND APPROVAL OF ARTHUR ANDERSEN LLP'S APPOINTMENT, AND PROXIES
EXECUTED AND RETURNED WILL BE SO VOTED UNLESS CONTRARY INSTRUCTIONS ARE
INDICATED THEREON.


                                       -7-

<PAGE>   10




                               COMPANY INFORMATION

INFORMATION ABOUT CURRENT AND CONTINUING DIRECTORS

<TABLE>
<CAPTION>

                         NAME                            AGE                           POSITION
                         ----                            ---                           --------

<S>                                                       <C>   <C>
Geoffrey F. Cox, Ph.D. ...............................    55    Chairman of the Board of Directors (Class II) and
                                                                Chief Executive Officer

Gabriel Lopez-Berestein, M.D..........................    51    Director (Class II) and Chief Scientific Advisor

James R. Butler.......................................    58    Director (Class III)

Phyllis I. Gardner, M.D...............................    48    Director (Class II)

Martin P. Sutter......................................    43    Director (Class I)

Gregory F. Zaic.......................................    51    Director (Class III)
</TABLE>

         Information regarding the business experience of Mr. Butler and Mr.
Zaic is set forth above under the heading "-- Nominees for Director."

         Geoffrey F. Cox, Ph.D. joined Aronex Pharmaceuticals as Chairman of the
Board and Chief Executive Officer in November 1997 and has served as a member of
the Board of Directors since January 1994. Dr. Cox joined Genzyme Corporation in
1984, was appointed Managing Director of Genzyme, Ltd. (U.K.) in 1986, Senior
Vice President of worldwide manufacturing operations in May 1988 and Executive
Vice President in 1996, with responsibility for manufacturing operations and the
Pharmaceuticals, Diagnostic Products and Genetic Diagnostic Products units of
Genzyme.

         Gabriel Lopez-Berestein, M.D., a co-founder of Aronex Pharmaceuticals,
has served as a member of the Board of Directors and our Chief Scientific
Advisor since January 1988. Dr. Lopez-Berestein is Professor of Medicine and
Chief of the Immunobiology and Drug Carriers Section at The University of Texas
M.D. Anderson Cancer Center, with which he has been affiliated since 1979. Dr.
Lopez-Berestein is the author of over 125 publications in the areas of
macrophage research and drug carrier technology. Dr. Lopez-Berestein is also the
recipient of a number of grants and awards, including a Scholar Award of the
Leukemia Society of America and various NIH awards.

         Phyllis I. Gardner, M.D. has served as a member of the Board of
Directors since September 1998. Dr. Gardner is the Senior Associate Dean for
Education and Student Affairs at Stanford University School of Medicine, and has
been a tenured associate professor in the departments of molecular pharmacology
and medicine at Stanford since 1984. Since 1994, Dr. Gardner has worked closely
with ALZA Corporation in the areas of drug formulation and drug delivery. From
1996 to 1998, she was Vice President of Research and Head of the ALZA Technology
Institute. Dr. Gardner is also a consultant or advisor to a number of companies
and serves as a member of the Board of Directors of Health Hero Network and Elim
Biopharmaceuticals, Inc.

         Martin P. Sutter, a co-founder of Aronex Pharmaceuticals, has served as
a director of the company since June 1986 and served as Chairman of the Board of
Directors of the company from 1986 to 1997. Since July 1988, Mr. Sutter has been
the managing General Partner of The Woodlands Venture Partners, L.P., a venture
capital firm based in The Woodlands, Texas, and the General Partner of The
Woodlands Venture Fund, L.P., one of the company's principal stockholders. In
addition, Mr. Sutter has been a General Partner of Essex Woodlands Health
Ventures IV, L.L.C., which is the general partner of Essex Woodlands Health
Ventures Fund IV, LP., a venture capital firm based in Chicago, Illinois and The
Woodlands, Texas. From January 1985 to July 1988, he served as President of The
Woodlands Venture Capital Company. Mr. Sutter is the Chairman of the Board of
Directors of Zonagen, Inc., a biotechnology company based in The Woodlands,
Texas, and a director of Targeted Genetics and several privately held healthcare
and biotechnology companies.


                                       -8-

<PAGE>   11




DIRECTORS' MEETINGS AND COMPENSATION

         During 1998, the Board of Directors met eight times and took certain
additional actions by unanimous written consent in lieu of meetings. During
1998, no director of Aronex Pharmaceuticals attended fewer than 75% of the
meetings of the Board of Directors, with the exception of James R. Butler, who
attended 5 of 8 meetings.

         Aronex Pharmaceuticals' directors do not receive any cash compensation
for service on the Board of Directors or any committee. The directors are,
however, reimbursed for expenses incurred in connection with attending each
board and committee meeting. Directors who are not employees of the company are
entitled to participate in the company's Amended and Restated 1993 Non-Employee
Director Stock Option Plan. Under the 1993 Non-Employee Director Plan, each
non-employee director receives (i) the grant of options to purchase 25,000
shares of the company's common stock upon his or her initial election to the
Board and (ii) an annual grant of options to purchase 7,500 shares of the
company's common stock at the end of each year of service as a director. The
1993 Non-Employee Director Plan also permits discretionary grants of options to
non-employee directors who do not serve on the Compensation Committee of the
Board of Directors.

BOARD COMMITTEES AND THEIR FUNCTIONS

         Aronex Pharmaceuticals' Board of Directors has an Audit Committee, a
Compensation Committee and a Nominating Committee.

         The Audit Committee's function includes making recommendations
concerning the engagement of independent public accountants, reviewing with the
independent public accountants the plan and results of the auditing engagement,
approving professional services provided by the independent public accountants
and reviewing the adequacy of the company's internal accounting controls. Dr.
Lopez-Berestein and Mr. Butler served as the members of the Audit Committee
during 1998. Mr. Zaic was added to the Audit Committee in June 1998.

         The Compensation Committee makes recommendations concerning
compensation, including incentive arrangements, for the company's officers. The
Compensation Committee also administers the company's Amended and Restated 1989
Stock Option Plan and 1998 Stock Option Plan (together, the "Incentive Plans").
Messrs. Sutter and Zaic served as members of the Compensation Committee during
1998. Dr. Lopez-Berestein was added to the Compensation Committee in June 1998.

         The Nominating Committee considers and proposes director nominees for
election at the Annual Meeting; selects candidates to fill Board vacancies as
they occur; makes recommendations to the Board of Directors regarding Board
committee memberships; and performs any other functions deemed appropriate by
the Board of Directors. The Nominating Committee will accept for consideration
shareholders' nominations for directors if made in writing. The nominee's
written consent to the nomination and sufficient background information on the
candidate must be included to enable the Committee to make proper judgments as
to his or her qualifications. Nominations should be addressed to the Nominating
Committee at the Company's headquarters. Messrs. Cox, Butler and Sutter served
as members of the Nominating Committee during 1998.

         During 1998, the Audit Committee met one time, the Compensation
Committee met three times and the Nominating Committee did not meet. During
1998, no director of the company attended fewer than 75% of the number of
meetings of committees on which he served, except for Dr. Lopez-Berestein, who
did not attend the audit committee meeting and one of the compensation committee
meetings.


                                       -9-

<PAGE>   12




REPORT OF THE COMPENSATION COMMITTEE

         The Compensation Committee of the company's Board of Directors
currently consists of Martin P. Sutter, Gregory F. Zaic and Gabriel
Lopez-Berestein, M.D., none of whom are officers or employees of the company.
The Compensation Committee is responsible for evaluating the performance of
management, determining the compensation for certain executive officers of
Aronex Pharmaceuticals and administering the company's Incentive Plans under
which grants may be made to the company's employees. The Committee has furnished
the following report on executive compensation for 1998:

         Under the supervision of the Compensation Committee, Aronex
Pharmaceuticals has developed a compensation policy which is designated to
attract and retain key executives responsible for the success of the company and
motivate management to enhance long-term stockholder value. The annual
compensation package for executive officers primarily consists of:

         o     a cash salary which reflects the responsibilities relating to the
               position and individual performance;

         o     variable performance awards payable in cash or stock and tied to
               the individual's or the company's achievement of certain goals or
               milestones; and

         o     long-term stock-based incentive awards which strengthen the
               mutuality of interests between the executive officers and the
               company's stockholders.

         In determining the level and composition of compensation of each of
Aronex Pharmaceuticals' executive officers, the Compensation Committee takes
into account various qualitative and quantitative indicators of corporate and
individual performance. Although no specific target has been established, the
Compensation Committee generally seeks to set salaries comparable to those of
peer group companies. In setting such salaries, the Compensation Committee
considers its peer group to be certain companies in the biotechnology industries
with market capitalizations similar to that of Aronex Pharmaceuticals. Such
competitive group does not necessarily include the companies comprising the
Nasdaq Pharmaceutical Index reflected in the performance graph in this proxy
statement, which is the industry categorization the company has been placed in
by its investment bankers. Because the company is still in the development
stage, the use of certain traditional performance standards (e.g., profitability
and return on equity) is not currently appropriate in evaluating the performance
of the company's executive officers. Consequently, in evaluating the performance
of management the Compensation Committee takes into consideration such factors
as the company's achieving specified milestones or goals in its clinical
development programs. In addition, the Compensation Committee recognizes
performance and achievements that are more difficult to quantify, such as the
successful supervision of major corporate projects, demonstrated leadership
ability and contributions to the industry. For 1998, the Compensation Committee
included in its evaluation the significant progress made by the company,
including the continuing clinical development and advancement of Aronex
Pharmaceuticals' products.

         Base compensation is established through negotiation between Aronex
Pharmaceuticals and the executive officer at the time the executive is hired,
and then subsequently adjusted when such officer's base compensation is subject
to review or reconsideration. While Aronex Pharmaceuticals has entered into
employment agreements with its executive officers, such agreements provide that
base salaries after the initial year will be determined by the Compensation
Committee after review. When establishing or reviewing base compensation levels
for each executive officer, the Compensation Committee, in accordance with its
general compensation policy, considers numerous factors, including the
responsibilities relating to the position, the qualifications of the executive
and the relevant experience the individual brings to the company, strategic
goals for which the executive has responsibility, and compensation levels of
companies at a comparable stage of development who compete with the company for
business, scientific, and executive talents. As stated above, such comparable
companies are generally those with similar market capitalizations and are not
necessarily among the companies comprising the Nasdaq Pharmaceutical Index
reflected in the performance graph in this Proxy Statement. No pre-determined
weights are given to any one of such factors. The base salaries for the
executive officers generally, and the Chief Executive Officer specifically, for
fiscal 1998 were comparable to the company's peer group companies.


                                      -10-

<PAGE>   13




         In addition to each executive officer's base compensation, the
Compensation Committee may award cash bonuses and/or grant awards under the
company's Incentive Plans to chosen executive officers depending on the extent
to which certain defined personal and corporate performance goals are achieved.
Such corporate performance goals are the same as discussed above.

         All employees of Aronex Pharmaceuticals, including its executive
officers, are eligible to receive long-term stock-based incentive awards under
the company's Incentive Plans as a means of providing such individuals with a
continuing proprietary interest in the company. Such grants further the
mutuality of interest between the company's employees and its stockholders by
providing significant incentives for such employees to achieve and maintain high
levels of performance. The company's Incentive Plans enhance the company's
ability to attract and retain the services of qualified individuals. Factors
considered in determining whether such awards are granted to an executive
officer of the company include:

         o     the executive's position in the Company,

         o     his or her performance and responsibilities,

         o     the amount of stock options, if any, currently held by the
               officer,

         o     the vesting schedules of any such options, and

         o     the executive officer's other compensation.

While the Compensation Committee does not adhere to any firmly-established
formulas or schedules for the issuance of awards such as options or restricted
stock, the Compensation Committee will generally tailor the terms of any such
grant to achieve its goal as a long-term incentive award by providing for a
vesting schedule encompassing several years or tying the vesting dates to
particular corporate or personal milestones.

COMPENSATION OF CHIEF EXECUTIVE OFFICER

         Geoffrey F. Cox, Ph.D. became the company's Chief Executive Officer in
November 1997. His base annual salary was set at $300,000 pursuant to his
employment agreement with the company, effective November 3, 1997 (the
"Employment Agreement"). His base salary was increased to $305,000 for 1999. In
setting the base salary for Dr. Cox, the Committee evaluated the compensation
package for chief executive officers of peer group biotechnology companies with
similar market capitalizations. The Committee expects that when it reevaluates
Dr. Cox's base salary level in the future, it will consider a variety of
factors, including Dr. Cox's responsibilities, his general background and
qualifications, his achievement of various corporate and personal milestones set
by the Committee from time to time, and compensation levels at peer group
companies for executives in Dr. Cox's position and with his background. The
Committee has not attached any particular relative weighting to the foregoing
factors (or any other factors which the Committee may also consider in reaching
compensation decisions for the company's executive officers).

         Dr. Cox received a sign-on bonus of $220,000, $110,000 of which was
paid to him in cash. He received the remaining $110,000 as a restricted stock
award under the 1989 Stock Option Plan, and accordingly, received 17,278 shares
of common stock, which grant was calculated based on the average closing sales
price of the company's common stock for the thirty-day period preceding November
3, 1997, $5.44 per share. Under the terms of Dr. Cox's Employment Agreement,
these shares were fully vested on the date of grant. The Employment Agreement
provides that Dr. Cox is eligible to receive future incentive bonus awards in an
amount up to 33% of his base annual salary. A bonus of $83,149 was paid to Dr.
Cox in 1999 for 1998. This bonus consisted of $42,650 in cash and 17,532 shares
of common stock at an assumed value of $2.31 per share. The Committee will
retain discretion to determine the amount of any future incentive bonus awards
to be paid to Dr. Cox, and the Committee expects that it will evaluate a number
of factors in reaching this decision, including the company's strategic goals
for which Dr. Cox has responsibility, his other responsibilities, his
initiatives and contributions to the company's achievement of various corporate
and strategic goals, and his own achievement of certain personal milestones as
determined by the Committee from time to time.


                                      -11-

<PAGE>   14




         Upon his hiring in November 1997, Dr. Cox was granted a stock option to
purchase 500,000 shares of common stock at an exercise price of $4.25 per share.
This option was negotiated by the company and Dr. Cox as part of the Employment
Agreement and the exercise price was the fair market value of the company's
stock specified in the Employment Agreement, which was September 3, 1997 the
date of a letter agreement pursuant to which Dr. Cox agreed to enter into
employment with the company. Twenty percent of the underlying shares vested on
the date of grant, and as long as he continues in the employ of the company, Dr.
Cox will be vested in 8,333 shares per month for the remaining 80% of the stock
option grant. The Committee expects that Dr. Cox will participate in the
Incentive Plans on the same general terms as other participants in the Plans
with respect to future stock option grants that he may be granted from time to
time, although the amount of shares underlying option grants to Dr. Cox will be
potentially larger than for other employees as a result of his position.

         His Employment Agreement also provides that for the next four years,
Dr. Cox will be eligible to receive an annual restricted stock grant of 25,000
shares of common stock if certain stock price objectives are achieved during
such fiscal years. The Employment Agreement contemplates that these shares will
be fully vested on issuance.

         Section 162(m) of the Internal Revenue Code of 1986 (the "Code"), added
by the Revenue Reconciliation Act of 1993, places a $1 million cap on the
deductible compensation that can be paid to certain executives of publicly-
traded corporations. Amounts that qualify as "performance based" compensation
under Section 162(m)(4)(c) of the Code are exempt from the cap and do not count
toward the $1 million limit. Generally, stock options will qualify as
performance-based compensation. The Compensation Committee has discussed and
considered and will continue to evaluate the potential impact of Section 162(m)
on the company in making compensation determinations, but has not established a
set policy with respect to future compensation determinations.

         The foregoing report is given by the following members of the
Compensation Committee:

                                Martin P. Sutter
                                 Gregory F. Zaic
                          Gabriel Lopez-Berestein, M.D.


EXECUTIVE COMPENSATION

EXECUTIVE OFFICERS

         Set forth below is certain information concerning the executive
officers of the company, including the business experience of each during the
past five years:

<TABLE>
<CAPTION>

                    NAME                          AGE                        POSITION WITH COMPANY
                    ----                          ---                        ---------------------

<S>                                                <C>    <C>
Geoffrey F. Cox, Ph.D........................      55     Chairman of the Board of Directors (Class II) and Chief
                                                          Executive Officer

Praveen Tyle, Ph.D...........................      38     Senior Vice-President, Development and Operations and
                                                          Chief Technical Officer

Paul A. Cossum, Ph.D.........................      46     Vice President, Preclinical Development

Janet M. Walter..............................      36     Vice President, Marketing and Business Development

Terance A. Murnane...........................      48     Controller and Secretary
</TABLE>


         Information regarding the business experience of Dr. Cox is set forth
above under the heading "Information about Current and Continuing Directors."

         Praveen Tyle, Ph.D. is currently Senior Vice President, Development and
Operations and Chief Technical Officer. Dr. Tyle joined the company in February
1997 as its Vice President of Pharmaceutical Development and Operations. Dr.
Tyle has more than 15 years of worldwide pharmaceutical industry experience,
serving most

                                      -12-

<PAGE>   15



recently (1991-97) as Senior Director, Pharmaceutical Development at Agouron
Pharmaceuticals, Inc., where he was responsible for the development of
preclinical and clinical products and their preparation toward
commercialization. From 1984 to 1991, Dr. Tyle held product development
positions at American Cyanamid Company and Novartis (formerly Sandoz
Pharmaceuticals Corporation). Dr. Tyle serves as a member of the Board of
Directors of Lipomed, Inc. and of the Scientific Advisory Board of a French
biotechnology company, Biovector Therapeutics, S.A., and is a scientific advisor
to Merck KGaA Biopharmaceuticals, Germany. Dr. Tyle also serves as an adjunct
Professor of Pharmaceutical Sciences at the University of Houston. He holds
several U.S. patents in the areas of drug development and delivery systems.

         Paul A. Cossum, Ph.D. joined Triplex Pharmaceutical Corporation as Vice
President of Preclinical Development in 1993 and assumed the position of Vice
President of Preclinical Development of Aronex Pharmaceuticals in September 1995
upon consummation of our mergers with Triplex and Oncologix. From 1992 to 1993,
he was the Director of Preclinical Development at Isis Pharmaceuticals. While at
Isis, he implemented preclinical programs to support the development INDs for
two anti-viral oligonucleotide compounds. Prior to his employment at Isis, Dr.
Cossum worked in the Department of Pharmacological Sciences at Genentech, Inc.,
where he participated in the filing of several INDs and NDAs for certain
endocrine, cardiovascular and neurologic therapeutic proteins. He has published
widely in the fields of metabolism and toxicology of oligonucleotides,
recombinant proteins and conventional drugs.

         Janet M. Walter joined Aronex Pharmaceuticals in August 1997 as Vice
President of Marketing and Business Development. Ms. Walter has more than ten
years of oncology marketing experience. From 1995-1997, she served as Director,
Global Marketing at Schering-Plough Pharmaceuticals, Inc. where she was
responsible for the worldwide development of INTRON A(R). From 1993 to 1995, she
served as Senior Product Manager for Bristol-Myers Squibb Oncology Division,
where she was responsible for the launch of TAXOL(R) in several different
markets, and Product manager at U.S. Bioscience. In addition, Ms. Walter has
several years of prior experience in oncology clinical research and field sales.

         Terance A. Murnane joined Aronex Pharmaceuticals in May 1990 as its
Controller and was appointed Secretary in January 1992. Mr. Murnane was a
self-employed accountant from February 1988 until April 1990. From October 1987
to February 1988, he served as the Controller for a privately-held wholesale
company. Prior to that time, he spent ten years in the Private Business/Audit
Department at KPMG Peat Marwick, an international accounting firm, serving most
recently as Senior Manager. Mr. Murnane is a Certified Public Accountant.


                                      -13-

<PAGE>   16




COMPENSATION OF EXECUTIVE OFFICERS

         SUMMARY COMPENSATION TABLE

         The following table provides certain summary information concerning
compensation paid or accrued during the last three years to Aronex
Pharmaceuticals' Chief Executive Officer and to each of the other executive
officers of the company, determined as of the end of the last fiscal year, whose
annual compensation exceeded $100,000. Further information with respect to each
of the named executive officer's compensation is described below the table.

<TABLE>
<CAPTION>

                                                                                          Long-Term
                                                 ANNUAL COMPENSATION                    Compensation
                                         ---------------------------------    ---------------------------
                                                                              Restricted      Securities
                                                                                Stock         Underlying      All Other
      Name and Principal Position        Year       Salary        Bonus         Awards        Options(#)     Compensation
- --------------------------------------   ----   ------------   -----------    -----------     -----------    -------------

<S>                                      <C>    <C>            <C>            <C>             <C>            <C>
Geoffrey F. Cox, Ph.D.................   1998   $    300,000   $  83,149(1)          --              --      $    27,475
   Chief Executive Officer               1997   $     50,000   $ 110,000      $  93,992         500,000      $       134
Praveen Tyle, Ph.D....................   1998   $    180,600   $  36,961(1)          --          80,000      $     1,376
   Senior Vice President, Development    1997   $    147,377   $  30,100      $  36,250         125,000      $    77,956
   and Operations and Chief Technical
   Officer
Paul A. Cossum, Ph.D..................   1998   $    168,000   $  27,384(1)          --          80,000      $     1,373
   Vice President, Preclinical           1997   $    168,000   $  33,600             --          41,000      $     1,302
   Development                           1996   $    163,000   $   2,000             --          44,800      $     1,292
Janet M. Walter.......................   1998   $    160,000   $  26,399(1)          --          50,000      $     1,353
   Vice President, Marketing and         1997   $     60,000   $  12,000             --         100,000      $     8,974
   Business Development
David S. Gordon, M.D.(2)..............   1998   $    213,000   $  34,080(1)          --          80,000      $    22,486
   Senior Vice President of Medical      1997   $    146,208   $  28,400             --         125,000      $    21,360
   Affairs and Chief Medical Officer
</TABLE>

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


(1)      Bonus for 1998 paid in 1999. A portion of the bonus paid to Dr. Cox,
         Dr. Tyle, Ms. Walter and Dr. Gordon ($40,499, $17,010, $12,959 and
         $17,253, respectively) was paid in shares of the company's common stock
         at an assumed value of $2.31 per share).

(2)      Dr. Gordon resigned from the company in March 1999.

         Dr. Cox joined Aronex Pharmaceuticals in November 1997 at an annual
base salary of $300,000. Dr. Cox's current salary is $305,000. The bonus in 1997
represents a cash bonus paid upon commencement of employment. The restricted
stock awards in 1997 represent a stock bonus of 17,278 shares of common stock
issued upon commencement of employment and were recorded at fair market value at
the time of issuance. Other compensation in 1998 represents $26,004 in
relocation costs, $471 in taxable life insurance and $1,000 in matching
contribution to our 401(k) savings plan. Other compensation in 1997 represents
taxable life insurance. We will pay the income tax related to the relocation
costs in 1999.

         Dr. Tyle joined Aronex Pharmaceuticals in February 1997 at an annual
base salary of $168,000. Dr. Tyle's current annual base salary is $210,000. The
restricted stock awards in 1997 represent a stock bonus of 5,000 shares of
common stock issued upon commencement of employment and recorded at fair market
value at the time of issuance. Other compensation in 1997 represents $46,386 in
relocation costs, $30,397 in estimated federal income taxes relating to his
relocation costs, which were reimbursed by the company in 1998, $173 in taxable
life insurance and $1,000 in matching contributions to our 401(k) savings plan.
Other compensation in 1998 represents $376 in taxable life insurance and $1,000
in matching contribution to our 401(k) savings plan.

         Dr. Cossum joined Aronex Pharmaceuticals in September 1995 at an annual
base salary of $160,000. Dr. Cossum's current annual base salary is $176,400.
Other compensation represents $1,000 in matching contributions to our 401(k)
savings plan in 1996, 1997 and 1998, respectively, and taxable life insurance of
$292, $302 and $373 in 1996, 1997 and 1998 respectively.


                                      -14-

<PAGE>   17




         Janet M. Walter joined Aronex Pharmaceuticals in August 1997 at an
annual base salary of $160,000. Other compensation in 1997 represents $7,924 in
relocation costs, $50 in taxable life insurance and $1,000 in matching
contributions to our 401(k) savings plan. Other compensation in 1998 represents
$353 in taxable life insurance and $1,000 in matching contributions to our
401(k) savings plan.

         Dr. Gordon joined Aronex Pharmaceuticals in April 1997 at an annual
base salary of $213,000. Other compensation in 1998 represents $21,000 in
housing allowance, $486 in taxable life insurance and $1,000 in matching
contributions to our 401(k) savings plan. Other compensation in 1997 represents
$6,952 in relocation costs, $12,250 in housing allowance, $1,158 in taxable life
insurance and $1,000 in matching contributions to our 401(k) savings plan. Dr.
Gordon resigned from Aronex Pharmaceuticals in March 1999. Pursuant to his
employment termination agreement, the company is obligated to pay his base
salary and benefits for a twelve-month period.

         OPTION GRANTS DURING 1998

         The following table provides certain information with respect to
options granted to the Chief Executive Officer and to each of the executive
officers named below during the fiscal year ended December 31, 1998, under our
Incentive Plans. The SEC requires disclosure of the potential realizable value
or present value of each grant. The disclosure assumes the options will be held
for the full seven-year term prior to exercise. These options may be exercised
prior to the end of the seven-year term. The actual value, if any, an executive
officer may realize will depend upon the excess of the stock price over the
exercise price on the date the option is exercised. There can be no assurance
that the stock price will appreciate at the rates shown in the table.

<TABLE>
<CAPTION>

                                             INDIVIDUAL GRANTS
                     ----------------------------------------------------------------     --------------------------------
                      NUMBER OF    PERCENT OF                                              POTENTIAL REALIZABLE VALUE AT
                     SECURITIES   TOTAL OPTIONS                 MARKET                        ASSUMED ANNUAL RATES OF
                     UNDERLYING    GRANTED TO    EXERCISE      PRICE ON                      STOCK PRICE APPRECIATION
                      OPTIONS     EMPLOYEES IN  PRICE PER      DATE OF    EXPIRATION             FOR OPTION TERM(1)
       NAME          GRANTED(#)   FISCAL YEAR     SHARE         GRANT        DATE              5%                  10%
- ------------------   ----------   ------------  ---------      --------   -----------     --------------------------------

<S>                    <C>        <C>          <C>           <C>          <C>             <C>              <C>
Geoffrey F. Cox            --          --      $      --     $       --            --     $         --     $           --
Praveen Tyle           80,000        11.7%     $    3.88     $     3.88      03/19/08     $    126,364     $      290,184
Paul A. Cossum         80,000        11.7%     $    3.88     $     3.88      03/19/08     $    126,364     $      290,184
Janet M. Walter        50,000         7.3%     $    2.44     $     2.44      12/10/08     $     49,666     $      114,054
David S. Gordon        80,000        11.7%     $    3.88     $     3.88      03/19/08     $    126,364     $      290,184
</TABLE>

         YEAR-END OPTION VALUES

         The following table sets forth certain information regarding (1) the
number of shares of common stock underlying unexercised options held by the
Chief Executive Officer and each named executive officer as of December 31,
1998, and (2) the value, at December 31, 1998, of exercisable and unexercisable
"in-the-money" stock options held by the Chief Executive Officer and each
executive officer named in the Summary Compensation Table. Neither the Chief
Executive Officer nor any other named executive officer exercised any stock
options during the year ended December 31, 1998. A stock option is
"in-the-money" if the closing market price of Aronex Pharmaceuticals' common
stock exceeds the exercise price of the stock option. The value of
"in-the-money" unexercised stock options set forth in the foregoing table
represents the difference between the exercise price of these options and the
closing sales price of our common stock on December 31, 1998, as reported by the
Nasdaq Stock Market, $2.00 per share.


                               1998 OPTION VALUES

<TABLE>
<CAPTION>

                                        NUMBER OF SECURITIES            VALUE OF UNEXERCISED
                                       UNDERLYING UNEXERCISED           IN-THE-MONEY OPTIONS
                                      OPTIONS AT FISCAL YEAR-END         AT FISCAL YEAR END
                                    -----------------------------  -----------------------------
              NAME                  EXERCISABLE     UNEXERCISABLE  EXERCISABLE     UNEXERCISABLE
- ---------------------------------   -----------     -------------  -----------     -------------

<S>                                  <C>               <C>         <C>            <C>
Geoffrey F. Cox, Ph.d............    249,157           283,343     $       --     $        --
Praveen Tyle, Ph.d...............     63,735            86,265     $       --     $        --
Paul A. Cossum, Ph.d.............     72,200           133,100     $   15,833     $        --
Janet M. Walter..................     71,226           126,569     $       --     $        --
David S. Gordon, M.d.............     67,500           137,500     $       --     $        --
</TABLE>



                                      -15-



<PAGE>   18
PERFORMANCE GRAPH

         The following performance graph compares the performance of the
company's common stock to the Nasdaq Composite Index and to the Nasdaq Index of
Pharmaceutical Companies. The graph covers the period from December 31, 1993 to
December 31, 1998. The graph assumes that the value of the investment in the
company's common stock and each index was 100 at December 31, 1993 and that all
dividends were reinvested.
[GRAPHIC OMITTED]


<TABLE>
<CAPTION>

                                 12/31/92    12/31/93     12/31/94    12/31/95     12/31/96     12/31/97    12/31/98
- ------------------------------ ------------------------ ------------------------ ------------ ------------------------

<S>                               <C>          <C>          <C>         <C>          <C>          <C>         <C>
Aronex Pharmaceuticals, Inc.      100.00       57.14        24.29       50.00        53.57        24.29       11.43
Nasdaq Composite Index            100.00      114.77       112.19      158.68       195.13       239.39      336.52
Nasdaq Pharmaceutical Index       100.00       89.11        67.07      123.01       123.40       127.41      163.09
</TABLE>

                     [COMPARATIVE STOCK PERFORMANCE GRAPH]


                                      -16-

<PAGE>   19


401(k) PLAN

         Aronex Pharmaceuticals maintains a retirement savings plan, effective
as amended on January 1, 1991, in which any employee of the Company who has
completed one month of employment may elect to participate. The plan is an
individual account plan providing for deferred compensation as described in
Section 401(k) of the Code and is subject to, and intended to comply with, the
Employee Retirement Income Security Act of 1974. Each eligible employee is
permitted to contribute up to 20% of his or her annual salary up to the
applicable statutory maximum prescribed in the Code. The company may, in its
discretion, contribute an amount equal to the employee's contribution, but this
company certification may not exceed an amount equal to six percent of the
employee's compensation. The company currently contributes an amount equal to
25% of the employee's contribution up to $1,000 per year. A participant is 50%
vested in the accrued benefits derived from the company's contributions after
completion of one year of employment following his or her election to
participate in the plan, and 100% vested in such contributions after completion
of two years of employment following such election. Participants may receive
hardship loans under the terms of the plan. The plan provides for distributions
in the event a participant dies, reaches the age of 65, becomes disabled or
terminates his employment prior to the age of 65. The company made contributions
of approximately $56,500 under the 401(k) plan in 1998.

EMPLOYMENT AGREEMENTS

         Aronex Pharmaceuticals has entered into employment agreements with Dr.
Cox, Dr. Cossum, Dr. Tyle, Ms. Walter and Mr. Murnane that establish their
annual salaries and provide for the payment of bonus compensation as may be
awarded by the Board of Directors and for their participation in all employee
benefit plans sponsored by us. The employment agreement for Dr. Cox has a
primary term ending in 2000, with automatic monthly renewals starting in May
1999 for an on-going eighteen months unless terminated by either party. Dr.
Cox's agreement provides that if he is terminated for any reason other than
cause, the company is obligated to pay him a lump-sum payment equal to 1.5 times
his annual salary and continue the provision of employment benefits for eighteen
months following termination. If Dr. Cox terminates his employment as a result
of a material reduction in job duties following a change in control of the
company, the company is obligated to pay him a lump sum payment equal to 2.5
times his annual base salary. All other employment agreements are for a one-year
period and renew automatically for one-year periods unless terminated by either
party. These agreements provide that if the employee is terminated for any
reason other than cause, Aronex Pharmaceuticals is obligated to pay to the
employee an amount equal to one year's annual base salary and continue the
provision of employment benefits for one year following termination. If any of
Dr. Tyle, Dr. Cossum, Ms. Walter or Mr. Murnane terminates his or her employment
as a result of a material reduction in job duties following a change in control
of the company, Aronex Pharmaceuticals is obligated to pay each of them an
amount equal to two years' annual base salary. Dr. Gordon resigned in March 1999
and the company is obligated to pay his monthly salary of $19,083 and certain
benefits for a twelve month period after termination.

TRANSACTIONS WITH CERTAIN AFFILIATES

         In February 1998, Aronex Pharmaceuticals amended its consulting
agreement with the company's chief scientific advisor and board member, Dr.
Gabriel Lopez-Berestein, for a three-year period ending December 31, 2000,
whereby the company is committed to pay consulting fees of $156,000 per year
through December 31, 2000. One-half of the amount to be paid over the next three
years will be paid in cash and one-half will be paid in common stock. Aronex
Pharmaceuticals paid cash of $144,000, $156,000, and $78,000 for the years ended
December 31, 1996, 1997 and 1998, respectively, and issued him 18,352 shares of
common stock in 1998, pursuant to this agreement.



                                      -17-

<PAGE>   20
STOCK OWNERSHIP BY THE COMPANY'S LARGEST STOCKHOLDERS AND MANAGEMENT

         The following table presents certain information regarding the
beneficial ownership of equity securities of Aronex Pharmaceuticals (which
includes shares that may be acquired on the exercise of the currently vested
portion of stock options) at February 28, 1999 by:

         o     each person who is known by us to own beneficially more than five
               percent of the outstanding shares of common stock;

         o     each director of the company;

         o     our chief executive officer and each of the other executive
               officers of the company named in the tables under Executive
               Compensation; and

         o     all directors and officers as a group, including all stock
               options vested through April 30, 1999.

Except as described below, each of the persons listed in the table has sole
voting and investment power with respect to the shares listed.

<TABLE>
<CAPTION>


                                                                                    STOCK         % OF TOTAL
                         NAME                              NUMBER OF SHARES     OPTIONS (11)      OUTSTANDING
- -------------------------------------------------------    ----------------     ------------      -----------

<S>                                                        <C>                  <C>               <C>
Essex Woodlands Health Ventures IV, L.L.C. (1)
2170 Buckthorne Place, Suite 170
The Woodlands, Texas 77380.............................        2,285,715             --             10.2%

Paragon Associates and Paragon Associates II
Joint Venture and the Bradbury Dyer Foundation(2)
500 Crescent Court, Suite 260
Dallas, Texas 75201....................................        1,751,000             --              7.8%

Hillman Medical Venture Partnerships(3)
824 Market Street, Suite 900
Wilmington, Delaware 19801.............................        1,187,925             --              5.3%

Geoffrey F. Cox(4).....................................          341,684         282,491             1.5%
Martin P. Sutter(5)....................................          570,625         105,625             2.5%
Gabriel Lopez-Berestein(6).............................          181,241          85,000               *
Gregory F. Zaic(7).....................................          452,739          47,500             2.0%
James R. Butler(8).....................................           38,000          32,500               *
Phyllis I. Gardner.....................................           25,000          25,000               *
Praveen Tyle...........................................          111,186          86,167               *
Paul A. Cossum(9)......................................           92,756          86,348               *
Janet M. Walter........................................           75,313          69,703               *
David S. Gordon(10)....................................           99,332          84,000               *
All directors and officers as a group (10 persons)
(4)-(10)...................................................    2,039,511                             9.1%
</TABLE>


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

*Less than one percent.

(1)      Shares are held directly by Essex Woodlands Health Ventures Fund IV,
         L.P. Essex Woodlands Health Ventures IV, L.L.C. is the sole general
         partner of Essex Woodlands Health Ventures Fund IV, L.P. Mr. Sutter, a
         director of the company, serves as one of three Managing Directors of
         Essex Woodlands Health Ventures IV, L.L.C. However, Mr. Sutter is not
         deemed to control Essex Woodlands Ventures IV, L.L.C. and Mr. Sutter
         disclaims beneficial ownership of these shares.

(2)      Consists of 1,731,000 shares beneficially owned by Paragon Associates
         II Joint Venture, which includes ownership of Paragon Associates and
         Paragon Associates II, and 20,000 shares owned by the Bradbury Dyer
         Foundation. The sole general partner of Paragon Associates and Paragon
         Associates II Joint Venture, Bradbury Dyer III, may be deemed to be the
         beneficial owners of 1,751,000 shares.

                                      -18-

<PAGE>   21
(3)      Consists of 141,232 shares owned by Hillman Medical Ventures 1989 L.P.,
         441,383 shares owned by Hillman Medical Ventures 1990 L.P. and 605,310
         shares owned by Hillman Medical Ventures 1991 L.P. The general partners
         of the Hillman Medical Venture Partnerships are Cashon Biomedical
         Associates, L.P. and Hillman/Dover Limited Partnership. The general
         partner of Hillman/Dover Limited Partnership is a wholly-owned
         subsidiary of The Hillman Company, a firm engaged in diversified
         investments and operations. The Hillman Company is controlled by Henry
         L. Hillman, Elsie Hilliard Hillman and C.G. Grefenstette, Trustees of
         the Henry L. Hillman Trust, which Trustees may be deemed the beneficial
         owners of the 1,187,925 shares owned by the Hillman Medical Venture
         Partnerships.

(4)      Includes 17,278 shares owned by Dr. Cox's spouse which may be
         considered to be beneficially owned.

(5)      Includes 463,883 shares owned by The Woodlands Venture Fund, L.P. Mr.
         Sutter is a general partner of The Woodlands Venture Partners, L.P.,
         which is the general partner of The Woodlands Venture Fund, L.P. Mr.
         Sutter disclaims beneficial ownership of the 463,883 shares owned by
         The Woodlands Venture Fund, L.P. Mr. Sutter is also one of three
         managing directors of Essex Woodlands Ventures IV, L.L.C., which is the
         general partner of Essex Woodlands Health Ventures Fund IV, L.P.
         However, Mr. Sutter is not deemed to control Essex Woodlands Ventures
         IV, L.L.C. and Mr. Sutter disclaims beneficial ownership of these
         shares.

(6)      Excludes 19,697 shares held by a relative of Dr. Lopez-Berestein, to
         which he disclaims beneficial ownership.

(7)      Includes 403,539 shares owned by Prince Venture Partners III, L.P. Mr.
         Zaic is the general partner of Prince Ventures, L.P., which is a
         general partner of Prince Venture Partners III, L.P. Mr. Zaic disclaims
         beneficial ownership of the shares held by Prince Venture Partners III,
         L.P.

(8)      Includes 3,000 shares owned through The Butler Living Trust and 2,500
         shares owned by the spouse of Mr. Butler which may be considered to be
         beneficially owned.

(9)      Includes 1,000 shares owned by two daughters of Dr. Cossum which may be
         considered to be beneficially owned.

(10)     Includes 3,000 shares owned by Gordon Strategic, Inc. which is wholly
         owned by Dr. Gordon and 500 shares owned by Dr. Gordon's spouse which
         may be considered to be beneficially owned.

(11)     The number of shares of common stock underlying stock options shown in
         this column are included in the column entitled "Number of Shares".

                                      -19-

<PAGE>   22





COMPLIANCE WITH SECTION 16(a)

         Section 16(a) of the Securities Exchange Act of 1934 requires the
company's directors and officers, and persons who own more than 10% of the
company's common stock, to file initial reports of ownership and reports of
changes in ownership (Forms 3, 4, and 5) of common stock with the Securities and
Exchange Commission and The Nasdaq Stock Market. Officers, directors and greater
than 10% stockholders are required by SEC regulations to furnish the company
with copies of all such forms that they file.

         To the company's knowledge, based solely on the company's review of the
copies of such reports received by Aronex Pharmaceuticals and on written
representations by certain reporting persons that no reports on Form 5 were
required, the company believes that during the fiscal year ended December 31,
1998, all Section 16(a) filing requirements applicable to its officers,
directors and 10% stockholders were complied with in a timely manner.

STOCKHOLDER PROPOSALS FOR THE 2000 ANNUAL MEETING

         Under our Bylaws, if you wish to bring any matter (other than
stockholder nominations of director candidates) before the 2000 Annual Meeting,
you must notify the company's Secretary in writing between 50 and 75 days prior
to the meeting. If notice or public announcement of the meeting date comes less
than 65 days prior to the meeting, stockholders are required to submit a notice
of nomination or proposal within 15 days after the meeting date is announced.

         Notices regarding each matter must contain:

         o     a brief description of the business to be brought before the
               Annual Meeting and the reason for conducting the business at the
               Annual Meeting;

         o     the name and address of record of the stockholder proposing the
               business;

         o     the class and number of shares of stock that are beneficially
               owned by the stockholder; and

         o     any material interest of the stockholder in the business to be
               conducted.

         If you do not provide the proper notice by such date, the Chairman of
the meeting may exclude the matter, and it will not be acted upon at the
meeting. If the Chairman does not exclude the matter, the proxies may vote in
the manner they believe appropriate, as the SEC's rules allow.

         For a stockholder proposal to be considered for possible inclusion in
the proxy statement for the 2000 Annual Meeting, the proposal must be received
by the company's Secretary no later than December 5, 1999. A nomination or
proposal that does not supply adequate information about the nominee or proposal
will be disregarded.

DISCRETIONARY VOTING OF PROXIES ON OTHER MATTERS

         The company's management does not currently intend to bring any
proposals to the 1999 Annual Meeting other than the election of directors and
the proposals described in this proxy statement. If new proposals requiring a
vote of the stockholders are brought before the meeting in a proper manner, the
persons named in the accompanying proxy card intend to vote the shares
represented by them in accordance with their best judgement.

1998 FORM 10-K

         A copy of the company's Annual Report on Form 10-K, including any
financial statements and schedules and exhibits thereto, may be obtained without
charge by written request to Connie Stout, Associate Director, Corporate
Communications, Aronex Pharmaceuticals, Inc., 8707 Technology Forest Place, The
Woodlands, Texas 77381-1191.


                                      -20-

<PAGE>   23


                                      By Order of the Board of Directors


                                      /s/ TERANCE A. MURNANE
                                      -----------------------------------------
                                      Terance A. Murnane
                                      Secretary

April 5, 1999
The Woodlands, Texas



                                      -21-
<PAGE>   24


                                                                       EXHIBIT A


                            CERTIFICATE OF AMENDMENT
                                       OF
                AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                          ARONEX PHARMACEUTICALS, INC.


         Aronex Pharmaceuticals, Inc. (the "Corporation"), organized and
existing under and by virtue of the General Corporation Law of the State of
Delaware (the "DGCL") does hereby certify:

         FIRST: That the Board of Directors of the Corporation duly adopted
resolutions setting forth the following amendment to the Amended and Restated
Certificate of Incorporation of the Corporation (the "Amendment"), declaring the
Amendment to be advisable and calling for the submission of the proposed
Amendment to the stockholders of the Corporation for consideration thereof. The
resolution setting forth the proposed Amendment is as follows:

         ARTICLE IV of the Amended and Restated Certificate of Incorporation of
Aronex Pharmaceuticals, Inc., a Delaware corporation, is hereby amended by
deleting Section A, and inserting the following as Section A:

         A. Classes of Stock

                  The number of shares of all classes of capital stock that the
Corporation shall be authorized to issue is 45,000,000 shares, divided into the
following: (i) 5,000,000 shares of preferred stock, par value $.001 per share
("Preferred Stock"), and (ii) 40,000,000 shares of common stock, par value $.001
per share ("Common Stock").

         SECOND: That thereafter pursuant to a resolution of the Board of
Directors, a meeting of the stockholders of the Corporation was duly called and
held, upon notice in accordance with Section 222 of the DGCL at which meeting
the necessary number of shares as required by statute were voted in favor of the
Amendment.

         THIRD: That the Amendment was duly adopted in accordance with the
provisions of Section 242 of the DGCL.

         FOURTH: That the Amendment shall be effective on the date this
Certificate of Amendment is filed and accepted by the Secretary of State of the
State of Delaware.

         IN WITNESS WHEREOF, the Corporation has caused this certificate to be
signed by Geoffrey F. Cox, its Chief Executive Officer, and attested by Terance
A. Murnane, its Secretary, this 24th day of May, 1999.


                                          ARONEX PHARMACEUTICALS, INC.



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

ATTEST: /s/ TERANCE A. MURNANE
        --------------------------------
             Terance A. Murnane
             Secretary
<PAGE>   25
                          ARONEX PHARMACEUTICALS, INC.

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
                     ANNUAL MEETING TO BE HELD MAY 11, 1999

  The undersigned hereby appoints Geoffrey F. Cox, Ph.D. and Terance A. Murnane
and each of them, as proxies, each with the power to appoint his substitute,
and hereby authorizes them to represent and vote, as designated on the reverse
side, all of the shares of the common stock of Aronex Pharmaceuticals, Inc.
(the "Company") held of record by the undersigned on March 19, 1999 at the
Annual Meeting (the "Annual Meeting") of Stockholders of the Company to be held
on Tuesday, May 11, 1999, at 1:30 p.m., local time, in the Willow Room of The
Houstonian Hotel, 111 North Post Oak Lane, Houston, Texas, and any
adjournment(s) thereof.

  IT IS IMPORTANT THAT YOUR SHARES BE REPRESENTED AT THE ANNUAL MEETING
REGARDLESS OF WHETHER YOU PLAN TO ATTEND. THEREFORE, PLEASE MARK, SIGN AND DATE
THE ENCLOSED PROXY AND RETURN IT IN THE ACCOMPANYING POSTPAID ENVELOPE AS
PROMPTLY AS POSSIBLE. IF YOU ARE PRESENT AT THE ANNUAL MEETING, AND WISH TO DO
SO, YOU MAY REVOKE THE PROXY AND VOTE IN PERSON.

                    (TO BE DATED AND SIGNED ON REVERSE SIDE)
<PAGE>   26
                        PLEASE DATE, SIGN AND MAIL YOUR
                      PROXY CARD BACK AS SOON AS POSSIBLE!


                         ANNUAL MEETING OF STOCKHOLDERS
                          ARONEX PHARMACEUTICALS, INC.

                                  MAY 11, 1999


              o PLEASE DETACH AND MAIL IN THE ENVELOPE PROVIDED o


       PLEASE MARK YOUR
 A     VOTES AS IN THIS
   [X] EXAMPLE.

                                           WITHHOLD
                                FOR        AUTHORITY
1. To elect two Class III       [ ]           [ ]     Nominees: James R. Butler
   directors of the Company,                                    Gregory F. Zaic
   each to serve until the
   Company's 2002
   Annual Meeting of Stockholders or until their respective
   successors have been duly elected and qualified.
(INSTRUCTION: To withhold authority to vote for any individual
nominee, write such name or names in the space provided below)

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

                                                          FOR   AGAINST  ABSTAIN
2. To vote upon a proposal to approve and adopt the       [ ]     [ ]      [ ]
   amendment of the Company's Certificate of
   Incorporation to increase the authorized shares of
   Common Stock from 30,000,000 to 40,000,000

3. To ratify and approve the appointment of Arthur        [ ]     [ ]      [ ]
   Andersen LLP as the Company's independent
   public accountants for its fiscal year ending
   December 31, 1999; and

   To act upon such other business as may properly come before the meeting or
   any adjournment thereof.

   Only stockholders of record at the close of business on March 19, 1999, will
   be entitled to notice of and to vote at the Annual Meeting.

<TABLE>
<S>                               <C>              <C>                              <C>
SIGNATURE                         Date             SIGNATURE                        DATE
         ------------------------     ------------          -----------------------     ------------
                                                                 Signature if
                                                                 held jointly
</TABLE>

Note:   Please execute the Proxy as your name appears hereon. When shares are
        held by joint tenants, both should sign. When signing as attorney,
        executor, administrator, trustee or guardian, please give full title as
        such. If a corporation, please sign in full corporate name by the
        president or other authorized officer. If a partnership, please sign in
        partnership name by authorized person.


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