ILEX ONCOLOGY INC
SC 13D, 1999-07-27
MEDICAL LABORATORIES
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934

                               Ilex Oncology, Inc.
                               -------------------
                                (Name of Issuer)

                                  Common Stock
                         ------------------------------
                         (Title of Class of Securities)
                                   0004519231
                                 --------------
                                 (CUSIP Number)

                                 Eileen McCarthy
                       One Post Office Square, Suite 3800
                                Boston, MA 02109
                                 (617) 482-8020
                       ----------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 July 16, 1999
                       -----------------------------------
             (Date of Event which Requires Filing of this Statement)

       If the filing person has previously  filed a statement on Schedule 13G to
report the acquisition  which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(b)(3) or (4), check the following box :.

       Check the following box if a fee is being paid with this  statement :. (A
fee is not required only if the reporting person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto  reporting  beneficial  ownership of five percent or less of such class.
(See Rule 13d-7).

       Note:  Six copies of this  statement,  including all exhibits,  should be
filed with the  Commission.  See Rule  13d-1(a) for other parties to whom copies
are to be sent.

       * The  remainder  of this cover page shall be filled out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

       The information required on the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934,  as  amended  (the  "Exchange  Act") or  otherwise  subject  to the
liabilities  of that  section  of the  Exchange  Act but shall be subject to all
other provisions of the Exchange Act.

                        (Continued on following page(s))

                               Page 1 of 41 pages


<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                              13D                            Page 2 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta Partners
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       California
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          1,194,600
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        -0-


                                                                       (9)      Sole Dispositive Power     1,194,600


                                                                       (10)     Shared Dispositive Power   -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IA
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 2 of 41 pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                            13D                            Page 3 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Partners, L.P.
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          742,547
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        -0-


                                                                       (9)      Sole Dispositive Power     742,547


                                                                       (10)     Shared Dispositive Power   -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  742,547
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  4.5%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  PN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 3 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 4 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta Embarcadero BioPharma, LLC
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       California
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          27,988
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        -0-


                                                                       (9)      Sole Dispositive Power     27,988


                                                                       (10)     Shared Dispositive Power   -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  27,988
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  .2%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 4 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                            13D                            Page 5 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Ilex Chase Partners (Alta Bio), LLC
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          424,065
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        -0-


                                                                       (9)      Sole Dispositive Power     424,065


                                                                       (10)     Shared Dispositive Power   -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  424,065
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  2.6%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 5 of 41 pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                            13D                            Page 6 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Management, LLC
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          742,547
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        452,053


                                                                       (9)      Sole Dispositive Power     742,547


                                                                       (10)     Shared Dispositive Power   452,053


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 6 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 7 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta/Chase BioPharma Management, LLC
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          424,065
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        770,535


                                                                       (9)      Sole Dispositive Power     424,065


                                                                       (10)     Shared Dispositive Power   770,535


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 7 of 41 pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 8 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Jean Deleage
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 8 of 41 pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 9 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Garrett Gruener
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 9 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 10 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

      Daniel Janney
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 10 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 11 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alix Marduel
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 11 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 12 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Guy Nohra
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 12 of 41 pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 13 of 41 Pages
<S>                                                                                      <C>               <C>
- ------------------------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Marino Polestra
- ------------------------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a) :
                                                                                        (b) X
- ------------------------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- ------------------------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- ------------------------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- ------------------------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- ------------------------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                       (7)      Sole Voting Power          -0-
Beneficially Owned
By Each Reporting
Person With                                                            (8)      Shared Voting Power        1,194,600


                                                                       (9)      Sole Dispositive Power     -0-


                                                                       (10)     Shared Dispositive Power   1,194,600


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,194,600
- ------------------------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- ------------------------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  7.3%
- ------------------------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- ------------------------------------------------------------------------------------------------------------------------------------
<FN>
                                                *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                         Page 13 of 41 pages
<PAGE>

Item 1.  Security and Issuer.

         This  Statement on Schedule D relates to the Common  Stock,  $0.001 par
value per share (the "Shares"),  of Ilex Oncology,  Inc., a Delaware corporation
(the "Company").  The principal  executive offices of the Company are located at
11550 IH-10 West Suite 300, San Antonio, Texas 78245.


Item 2.  Identity and Background.

         (a) This  Statement  is  filed  by Alta  BioPharma  Partners,  L.P.,  a
Delaware limited partnership ("Alta BioPharma"), and Alta Embarcadero BioPharma,
LLC, a California limited liability company  ("Embarcadero LLC"), and Ilex Chase
Partners  (Alta Bio),  LLC, a Delaware  LLC ("Ilex Alta Bio") by virtue of their
direct beneficial  ownership of Shares, by Alta BioPharma  Management  Partners,
LLC, a Delaware  limited  liability  company ("Alta  Management"),  by virtue of
being the sole  general  partner  of Alta  BioPharma,  by  Alta/Chase  BioPharma
Management LLC, a Delaware limited liability company (Alta/Chase  Management) by
virtue of being the sole managing  director of Ilex Chase  Partners  (Alta Bio),
LLC and by Alta Partners, a California corporation ("Alta Partners"),  by virtue
of being the management  advisory  company of these  entities.  Alta  BioPharma,
Embarcadero LLC, Ilex Alta Bio, Alta Management,  Alta/Chase Management and Alta
Partners are collectively  referred to as the "Reporting Persons." Jean Deleage,
Garrett Gruener, Dan Janney, Alix Marduel, Guy Nohra and Marino Polestra are the
managing  directors of Alta  Management,  Alta/Chase  Management and officers of
Alta Partners (the "Partners").  By virtue of the relationships  described above
and  their  roles  with Alta  Partners,  each of the  Partners  may be deemed to
control Alta Partners,  Alta/Chase Management,  Alta Management, and, therefore,
may be deemed to possess  indirect  beneficial  ownership  of the Shares held by
each  entity.  However,  none of the  Partners,  acting  alone,  has  voting  or
investment  power with respect to the Shares directly  beneficially  held by the
entities and, as a result,  the Partners  disclaim  beneficial  ownership of the
Shares directly beneficially owned by each entity, except to the extent of their
pecuniary interest in each entity.  Embarcadero LLC is a side company that makes
all  investments  pro rata to the capital of Alta BioPharma with all allocations
made to its  members  based on  paid-in  capital.  Certain of the  Partners  are
members of Embarcadero LLC and certain members of Embarcadero LLC are affiliates
of Alta Partners.

         (b) The principal executive offices of Alta BioPharma, Embarcadero LLC,
Ilex Alta Bio, Alta Management, Alta/Chase Management and Alta Partners, and the
business address of each Partner,  are located at One Embarcadero Center,  Suite
4050, San Francisco, California 94111.

         (c) Alta  Partners  provides  investment  advisory  services to venture
capital firms.  Alta BioPharma,  Ilex Alta Bio and  Embarcadero  LLC's principal
business is acting as venture capital investment vehicles. Alta/Chase Management
and Alta Management's  principal business is acting as managing director of Ilex
Alta Bio and  Alta  BioPharma,  respectively.  Each of the  Partners'  principal
business is acting as a managing  director  of Alta  Management  and  Alta/Chase
Management and as an officer of Alta Partners.

         (d) None of the Reporting Persons or, to the knowledge of the Reporting
Persons, any of the Partners, has been convicted in a criminal proceeding in the
past five years (excluding traffic violations or similar misdemeanors).

         (e) During the past five years,  none of the  Reporting  Persons or, to
the knowledge of the Reporting  Persons,  and of the Partners,  was a party to a
civil proceeding of a judicial or administrative body of competent  jurisdiction
as a result of which such  person was or is  subject  to a  judgment,  decree or
final  order  enjoining  future  violations  of,  or  prohibiting  or  mandating
activities subject to, federal or state securities laws of finding any violation
with respect to such laws.

                               Page 14 of 41 pages

<PAGE>

         (f) Alta  Partners is a  California  corporation.  Alta  BioPharma is a
Delaware limited partnership.  Embarcadero LLC is a California limited liability
corporation.  Ilex Alta Bio is a Delaware liability company. Alta Management and
Alta/Chase  Management are Delaware  limited  liability  companies.  Each of the
Managing Directors is a citizen of the United States.


Item 3.  Source and Amount of Funds or Other Consideration.

         The total  amount of funds  required by Alta  BioPharma  to acquire the
742,547 shares of Common Stock reported in Item 5(a) was  $6,215,859,  the total
amount of funds  required by  Embarcadero  LLC to acquire  the 27,988  shares of
Common  Stock  reported in Item 5(a) was  $234,289 and the total amount of funds
required by Ilex Alta Bio to acquire the 424,065 shares of Common Stock reported
in Item 5(a) was $3,549,852.  Such funds were provided by each entities' capital
available for investment.


Item 4.  Purpose of Transaction.

         Alta BioPharma,  Embarcadero LLC, and Ilex Alta Bio acquired the Common
Stock reported in Item 5(c) for investment only. Depending upon their evaluation
of the  Company's  investments  and  prospects,  and  upon  future  developments
(including,  but not limited to, market for the Shares,  the effective  yield on
the Shares,  availability of funds,  alternative uses of funds, and money, stock
market and general economic conditions),  each of the Reporting Persons may from
time to time  purchase  the  Common  Stock,  dispose  of all or a portion of the
Common Stock that it holds,  or cease buying or selling  Common Stock.  Any such
additional  purchases  or sales of the  Common  Stock  may be in open  market or
privately-negotiated transactions or otherwise.

         On July 16, 1999,  Alta  BioPharma,  Embarcadero  LLC and Ilex Alta Bio
entered into a Common Stock  Purchase  Agreement  (the "Common  Stock"  Purchase
Agreement") with the Company  pursuant to which Alta BioPharma,  Embarcadero LLC
and Ilex Alta Bio acquired,  for an aggregate  purchase price of $10,000,000,  a
total of 1,194,600 Shares of Common Stock.

Item 5.  Interest in Securities of the Issuer.

         (a) Alta BioPharma is the direct  beneficial owner of 742,547 shares of
Common  Stock or  approximately  4.5% of the shares  deemed  outstanding  by the
Company (16,368,879) as of July 16, 1999. Ilex Alta Bio is the direct beneficial
owner of  424,065  shares of Common  Stock or  approximately  2.6% of the shares
deemed outstanding by the Company (16,368,879) as of July 16, 1999.  Embarcadero
LLC is the  direct  beneficial  owner  of  27,988  shares  of  Common  Stock  or
approximately .2% of the shares deemed  outstanding by the Company  (16,368,879)
as of July 16, 1999.

         (b) Each entity has the power to direct the disposition of and vote the
stock held by it. By virtue of the relationships  previously reported under Item
2 of this Statement,  Alta Management,  Alta/Chase  Management and Alta Partners
may be deemed to have indirect beneficial  ownership of the shares owned by such
entities.

         (c) On July 16, 1999 Alta BioPharma, Ilex Alta Bio, and Embarcadero LLC
acquired  the  Shares  described  in Item 3 of  this  Statement  in a  privately
negotiated   transaction  with  the  Company  for  aggregate   consideration  of
$6,215,859, $3,549,852 and $234,289, respectively.

Except as set forth above,  neither the Reporting  Persons nor the Partners have
effected any transaction in the Shares during the past 60 days.

                               Page 15 of 41 pages

<PAGE>

         (d) Alta  BioPharma,  Ilex Alta Bio and  Embarcadero  LLC each have the
right to receive  dividends  and proceeds  from the sale of Common Stock held by
it. By virtue of the  relationships  reported in Item 2 of this Statement.  Alta
Management,  Alta/Chase  Management  and Alta Partners may be deemed to have the
power to direct the receipt of dividends  and the proceeds  from the sale of the
Common Stock held by each entity.

         (e) Not Applicable

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
Securities of the Issuer.

         The Ilex Oncology Inc. Stock Purchase  Agreement dated July 16, 1999 is
hereby incorporated in its entirety by this reference.

Item 7.  Material to be Filed as Exhibits.

         Exhibit A:  Joint Filing Statement

         Exhibit B:  Ilex Oncology Inc. Stock Purchase Agreement dated
         July 16, 1999.

         Exhibit C:  Alta  BioPharma  Partners  Limited  Partnership  Management
         Rights Agreement dated July 16, 1999.

                               Page 16 of 41 pages

<PAGE>

Signature


         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.


Date:  July 26, 1999
<TABLE>
<CAPTION>
<S>                                                           <C>
Alta Partners                                                 Alta BioPharma Partners, L.P.

By:               /s/ Eileen McCarthy                         By:  Alta BioPharma Management, LLC
     --------------------------------------------                  Its General Partner
     Eileen McCarthy, Vice President


Alta BioPharma Management, LLC                                By:             /s/ Eileen McCarthy
                                                                   --------------------------------------------
                                                                   Eileen McCarthy, Member

By:               /s/ Eileen McCarthy                         Ilex Chase Partners (Alta Bio), LLC
     --------------------------------------------
     Eileen McCarthy, Member
                                                              By:  Alta/Chase BioPharma Management, LLC
Alta/Chase BioPharma Management, LLC                               Its Managing Member

By:               /s/ Eileen McCarthy                         By:             /s/ Eileen McCarthy
     --------------------------------------------                  --------------------------------------------
     Eileen McCarthy, Member                                       Eileen McCarthy, Member

Alta Embarcadero BioPharma, LLC


By:               /s/ Eileen McCarthy
     --------------------------------------------
     Eileen McCarthy, Member


     /s/ Jean Deleage                                              /s/ Guy Nohra
- ------------------------------------                          ------------------------------------
Jean Deleage                                                  Guy Nohra

     /s/ Garrett Gruener                                           /s/ Marino Polestra
- ------------------------------------                          ------------------------------------
Garrett Gruener                                               Marino Polestra

     /s/ Daniel Janney                                             /s/ Alix Marduel
- ------------------------------------                          ------------------------------------
Daniel Janney                                                 Alix Marduel

</TABLE>

                                        Page 17 of 41 pages

<PAGE>


                                            EXHIBIT A

                                     Joint Filing Statement

         We, the  undersigned,  hereby  express our agreement  that the attached
Schedule 13D is filed on behalf of each of us.


Date:  July 26, 1999
<TABLE>
<CAPTION>
<S>                                                           <C>
Alta Partners                                                 Alta BioPharma Partners, L.P.

By:               /s/ Eileen McCarthy                         By:  Alta BioPharma Management, LLC
     --------------------------------------------                  Its General Partner
     Eileen McCarthy, Vice President


Alta BioPharma Management, LLC                                By:             /s/ Eileen McCarthy
                                                                   --------------------------------------------
                                                                   Eileen McCarthy, Member

By:               /s/ Eileen McCarthy                         Ilex Chase Partners (Alta Bio), LLC
     --------------------------------------------
     Eileen McCarthy, Member
                                                              By:  Alta/Chase BioPharma Management, LLC
Alta/Chase BioPharma Management, LLC                               Its Managing Member

By:               /s/ Eileen McCarthy                         By:             /s/ Eileen McCarthy
     --------------------------------------------                  --------------------------------------------
     Eileen McCarthy, Member                                       Eileen McCarthy, Member

Alta Embarcadero BioPharma, LLC


By:               /s/ Eileen McCarthy
     --------------------------------------------
     Eileen McCarthy, Member


     /s/ Jean Deleage                                              /s/ Guy Nohra
- ------------------------------------                          ------------------------------------
Jean Deleage                                                  Guy Nohra

     /s/ Garrett Gruener                                           /s/ Marino Polestra
- ------------------------------------                          ------------------------------------
Garrett Gruener                                               Marino Polestra

     /s/ Daniel Janney                                             /s/ Alix Marduel
- ------------------------------------                          ------------------------------------
Daniel Janney                                                 Alix Marduel

</TABLE>

                                        Page 18 of 41 pages

<PAGE>



                            STOCK PURCHASE AGREEMENT

         THIS STOCK PURCHASE  AGREEMENT  ("Agreement") is entered into as of the
16th  day of  July,  1999,  by and  between  ILEX  Oncology,  Inc.,  a  Delaware
corporation,  (the "Company"),  and each of the Investors listed on the Schedule
of Investors  attached hereto as Schedule A  (collectively,  the "Investors" and
individually, each an "Investor").


                                    ARTICLE I
                           PURCHASE AND SALE OF SHARES

         1.1 Purchase and Sale.  Subject to the terms and conditions hereof, the
Investors  agree to purchase from the Company,  and the Company  agrees to issue
and sell to the Investors, an aggregate number of shares of the Company's common
stock,  $.01  par  value,  equal  to  the  quotient  obtained  by  dividing  (x)
$20,000,000  by (y) 85% of the Market  Price  (the  "Shares")  for an  aggregate
purchase price of twenty million dollars  ($20,000,000)  (the "Purchase Price").
The  number  of  Shares  to be sold by the  Company  to  each  Investor  and the
aggregate  consideration to be received by the Company from each Investor is set
forth opposite  Investor's  name on the Schedule of Investors  attached  hereto.
"Market  Price"  shall mean the average of the closing bid and asked prices of a
share of Common Stock for the 30 consecutive  trading days immediately  prior to
the Closing Date.

         1.2 The Closing.  The closing  ("Closing")  of the purchase and sale of
the Shares  shall take place in such manner as the parties may  mutually  agree.
The date of the Closing is hereinafter referred to as the "Closing Date." At the
Closing, the Company shall deliver stock certificates representing the Shares in
such  denomination  and  registered in the name of each Investor as set forth on
the Schedule of Investors  upon  delivery to the Company by each Investor of the
aggregate  amount of the  purchase  price of the Shares to be  purchased by such
Investor as set forth on the Schedule of Investors in United  States  dollars in
immediately  available funds by wire transfer to an account  designated prior to
the Closing Date in writing by the Company for such purpose.


                                   ARTICLE II
                         REPRESENTATIONS OF THE COMPANY


         The Company represents and warrants to the Investors as follows:

         2.1 Organization, Good Standing and Qualification.  The Company: (a) is
a corporation  duly organized,  validly  existing and in good standing under the
laws of the  State  of  Delaware;  (b) has all  requisite  corporate  power  and
authority  to own and  operate  its  properties  and  assets and to carry on its
business as it is presently being conducted and as proposed to be conducted; and
(c) is qualified and is in good standing as a foreign  corporation  in all other

                               Page 19 of 41 pages

<PAGE>

jurisdictions  in which the failure so to qualify would have a material  adverse
effect on its business or properties.

         2.2  Capitalization.  Immediately prior to the Closing,  the authorized
capital of the Company  consists of 60,000,000  shares of Common Stock, of which
12,979,678  shares were issued and  outstanding  on July 15, 1999,  all of which
have been validly issued, and are fully paid and non-assessable,  and 20,000,000
shares of Preferred Stock, none of which were issued and outstanding on the date
hereof.

         2.3 Authorization.  All corporate action on the part of the Company and
its  officers,  directors  and  shareholders  necessary  for the  authorization,
execution and delivery of this Agreement,  the performance of all obligations of
the Company hereunder and the authorization, issuance and delivery of the Shares
has been taken or will be taken on or prior to the Closing,  and this  Agreement
constitutes a valid and legally binding obligation of the Company.

         2.4 Valid Issuance of Shares.  When issued in accordance with the terms
of this  Agreement,  the Shares shall be duly and validly  authorized and issued
(including, without limitation, issued in compliance with applicable federal and
state securities  laws),  fully paid and  non-assessable  and not subject to any
preemptive  rights,  liens,  claims or  encumbrances,  or other  restriction  on
transfer.  Furthermore,  the certificates representing the Shares will be in due
and proper form and have been duly and validly  executed by the  officers of the
Company named thereon.

         2.5   Governmental   Consents.   All   consents,   approvals,   orders,
authorizations,  registrations,  qualifications,  designations,  declarations or
filings of or with any  federal,  state or local  governmental  authority on the
part  of the  Company  required  in  connection  with  the  consummation  of the
transactions  contemplated  herein have been or shall be  obtained  prior to the
Closing and shall be effective as of the Closing.

         2.6   Litigation.   There  are  no  actions,   suits,   proceedings  or
investigations  pending or, to the best of the  Company's  knowledge and belief,
any basis  therefor or threat  thereof,  against or affecting  the Company which
question  the  validity of this  Agreement  or the right of the Company to enter
into it, or to consummate the transactions  contemplated  hereby, or which might
result, either individually or in the aggregate,  in any material adverse change
in the business, prospects,  conditions, affairs or operations of the Company or
in any of the properties or assets,  or in any material  impairment of the right
or  ability of the  Company  to carry on its  business  as now  conducted  or as
proposed to be conducted.  The foregoing includes,  without limitation,  actions
pending or threatened (or any basis therefor known to the Company) involving the
prior employment of any of the Company's  employees,  use in connection with the
Company's business of any information or techniques allegedly proprietary to any
former  employers of the Company's  employees,  or  obligations of the Company's
employees under any agreements with their prior employers.  The Company is not a
party or subject to the provisions of any order, writ,  injunction,  judgment or
decree  of any court or  governmental  agency  or  instrumentality.  There is no
action,  suit,  proceeding or investigation by the Company  currently pending or
which the Company intends to initiate.

                               Page 20 of 41 pages

<PAGE>


         2.7 No Conflict With Other Instruments. The Company is not in violation
or  default  of any  provisions  of its  Amended  and  Restated  Certificate  of
Incorporation  or Bylaws,  as amended,  or of any instrument,  judgment,  order,
writ,  decree or  contract to which it is a party or by which it is bound or, to
its knowledge,  of any provision of federal or state statute, rule or regulation
applicable  to the  Company,  which  violation  or default  would be  materially
adverse  to the  Company.  The  execution,  delivery  and  performance  of  this
Agreement  will  not  result  in any  violation  of,  be in  conflict  with,  or
constitute a default under, with or without the passage of time or the giving of
notice:  (a) any  provision of the Company's  Certificate  of  Incorporation  or
Bylaws; (b) any provision of any judgment,  decree or order to which the Company
is a party or by which it is bound;  (c) any material  contract,  obligation  or
commitment  to which the  Company is a party or by which it is bound;  or (d) to
the Company's knowledge, any statute, rule or governmental regulation applicable
to the Company.

         2.8 Securities and Financial Statement Matters.  Company has duly filed
in a timely  manner  (without  any  permitted  extension)  all reports (the "SEC
Reports")  required  to be filed by Company  with the  Securities  and  Exchange
Commission  (the "SEC") under the  Securities  Exchange Act of 1934,  as amended
(the "1934 Act"). The SEC Reports (including, in each case, without limiting the
generality thereof,  the audited and unaudited  financial  statements of Company
included  therein)  when filed  contained all  statements  required to be stated
therein in accordance with the 1934 Act and did not contain any untrue statement
of material fact or omit to state a material  fact  necessary to make any of the
statements  contained therein not misleading in light of the circumstances under
which they were made and  otherwise  complied in all material  respects with the
applicable  requirements of the 1934 Act. The consolidated  financial statements
included  in the  SEC  Reports  comply  as to  form  with  the  requirements  of
Regulation  S-X, as  promulgated by the SEC under the Securities Act of 1933, as
amended (the "1933 Act"),  and are derived from the applicable books and records
of Company,  have been prepared in conformity with generally accepted accounting
principles  (as required by  Regulation  S-X) and present  fairly the  financial
condition,  results of operations,  changes in security holders' equity and cash
flows of Company on a consolidated  basis,  as at the close of business,  or for
the period ended, on the date of each of such financial statements.

         2.9 Absence of Certain  Changes or Events.  Except as  disclosed in the
financial  statements referred to in Section 2.8, the Company's Annual Report on
Form 10-K for the year  ended  December  31,  1998 and the  Company's  Quarterly
Report on Form  10-Q for the  quarter  ended  March 31,  1999,  or as  otherwise
disclosed in Section 2.9 of the Disclosure Schedule attached hereto, since March
31, 1999, neither Company nor any of its subsidiaries or affiliates has incurred
any  liabilities  or  obligations,  direct or  contingent,  or entered  into any
transactions,  not in the  ordinary  course of  business,  that are  material to
Company and its subsidiaries and affiliates, taken as a whole, and there has not
been  (i) any  material  change  in the  capital  stock  of the  Company  or its
subsidiaries  that would have a Material  Adverse  Effect (as defined  below) or
(ii) any event,  change or  occurrence  which  individually  or in the aggregate
might (x) have a material adverse effect on the condition  (financial or other),
assets,  business,  or results of operations of Company,  taken as a whole,  (y)
materially   adversely  affect  Company's  ability  to  consummate  any  of  the
transactions  contemplated  hereby or to  perform  its  obligations  under  this
Agreement or (each of (x) and (y) being referred to herein,  individually  or in
the aggregate as a

                               Page 21 of 41 pages
<PAGE>

"Material Adverse Effect"). No event has occurred since March
31,  1999,  with  respect to which  Company  would be required to file a Current
Report on Form 8-K under the 1934 Act.

         2.10  Corporate  Documents.  The Amended and  Restated  Certificate  of
Incorporation and Bylaws, as amended,  of the Company are in the form previously
provided to each Investor.

         2.11  Registration  Rights.  Except as provided in Section  2.11 of the
Disclosure Schedule,  the Company is under no contractual obligation to register
(now or in the future,  whether contingent or not) under the 1933 Act any of its
presently outstanding  securities or any of its securities that may subsequently
be issued.

         2.12 Brokers and Finders.  The Company has not retained any  investment
banker, broker,  finder,  consultant or intermediary and is not obligated to any
such person for any fee, in connection  with the  transactions  contemplated  by
this Agreement.

         2.13 SEC  Documents.  The Company has  provided  to each  Investor  its
Annual Report on Form 10-K for the year ended  December 31, 1998,  its Quarterly
Report  on Form  10-Q for the  quarter  ended  March  31,  1999,  and its  proxy
statement  with respect to the Annual  Meeting of  Stockholders  held on May 26,
1999.

         2.14 Investment Company Act. The Company is not an "investment company"
or a company controlled by an "investment  company" as such terms are defined in
the Investment Company Act of 1940, as amended.

         2.15  Compliance  with Law.  The  business  of the Company is not being
conducted  in  violation of any material  law,  ordinance or  regulation  of any
governmental   entity  (including,   without   limitation,   those  relating  to
environmental  protection and  occupational  safety and health  practices).  All
material  governmental  approvals,  permits and licenses required to conduct the
current  business of the Company  have been  obtained  and are in full force and
effect and are being complied with in all material respects.

         2.16 Form S-3.  The Company is a registrant  qualified  and entitled to
use a registration statement on Form S-3.


                                   ARTICLE III
                        REPRESENTATIONS OF EACH INVESTOR

         Each Investor represents and warrants to the Company as follows:

         3.1  Authorization.  The Investor has full power and authority to enter
into this  Agreement.  This  Agreement  constitutes a valid and legally  binding
obligation of each Investor.

         3.2 Brokers  and  Finders.  No Investor  has  retained  any  investment
banker, broker,  finder,  consultant or intermediary and is not obligated to any
such person for any fee, in connection  with the  transactions  contemplated  by
this Agreement.

                               Page 22 of 41 pages

<PAGE>

                                   ARTICLE IV
                                 SECURITIES LAWS


         4.1  Securities  Laws  Representations  and Covenants of the Investors.
Each Investor represents, warrants and covenants to the Company as follows:

         (a) Purchase  Entirely for Own Account.  The Shares are being  acquired
for investment for each Investor's own account,  not as a nominee or agent,  and
not  with a view to the  resale  or  distribution  of any part  thereof,  and no
Investor has any present intention of selling, granting any participation in, or
otherwise  distributing  the same.  No Investor has any  contract,  undertaking,
agreement  or   arrangement   with  any  person  to  sell,   transfer  or  grant
participation to such person or to any third person,  with respect to any of the
Shares.  No  Investor  was  organized  solely for the purpose of  acquiring  the
Shares.

         (b) Disclosure of Information.  Each Investor  believes it has received
all information it considers  necessary or appropriate  for deciding  whether to
purchase the Shares.  Each Investor has had an  opportunity to ask questions and
receive  answers  from the Company  regarding  the terms and  conditions  of the
offering of the Shares.

         (c) Investment  Experience.  Each Investor has  previously  invested in
companies  in  the  development  stage,  can  bear  the  economic  risks  of the
investment  and has such  knowledge  and  experience  in  financial  or business
matters that it is capable of evaluating  the merits and risks of its investment
in the Shares.

         (d)  Accredited  Investor.  Each Investor is an accredited  investor as
defined in Rule 501(a) of  Regulation  D, as amended,  of the SEC under the 1933
Act.

         (e) Restricted Securities. Each Investor understands that the Shares it
is  purchasing  pursuant to this  Agreement  are  characterized  as  "restricted
securities"  under  the  federal  securities  laws  inasmuch  as they are  being
acquired from the Company in a transaction  not involving a public  offering and
that under such laws and applicable regulations the Shares may be resold without
registration under the 1933 Act only in certain limited  circumstances.  In this
connection, each Investor is familiar with SEC Rule 144, as presently in effect,
and understands the resale limitations imposed thereby and by the 1933 Act.

         (f)  Disposition  of Shares.  No  Investor  will  dispose of any of the
Shares (other than pursuant to SEC Rules 144 or 144A or any similar or analogous
rule or rules)  unless  and until (i) such  Investor  shall  have  notified  the
Company  of the  proposed  disposition  and the  circumstances  surrounding  the
proposed disposition and, if reasonably requested by the Company,  such Investor
shall  have  furnished  the  Company  with  an  opinion  of  counsel  reasonably
satisfactory  in form and  substance  to the  Company  to the  effect  that such
disposition will not require  registration  under the 1933 Act; or (ii) there is
in effect a  registration  statement  under the 1933 Act  covering  the proposed
disposition  and  the  proposed  disposition  is made in  accordance  with  such
registration statement.

                               Page 23 of 41 pages

<PAGE>

         4.2  Legends.  The  certificates  evidencing  the  Shares  may bear the
restrictive legend set forth below:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
          "ACT"),  OR UNDER  ANY  APPLICABLE  STATE  SECURITIES  LAWS.
          NEITHER  THE  SECURITIES  NOR ANY  INTEREST  THEREIN  MAY BE
          OFFERED FOR SALE,  SOLD,  TRANSFERRED,  PLEDGED OR OTHERWISE
          DISPOSED  OF EXCEPT  PURSUANT TO AN  EFFECTIVE  REGISTRATION
          STATEMENT UNDER THE ACT AND SUCH STATE SECURITIES LAWS OR AN
          EXEMPTION  FROM  REGISTRATION  UNDER  SUCH ACT AND SUCH LAWS
          WHICH,  IN THE  OPINION OF  COUNSEL  FOR THE  HOLDER,  WHICH
          COUNSEL  AND  OPINION  ARE  REASONABLY  SATISFACTORY  TO THE
          COUNSEL FOR THIS CORPORATION, IS AVAILABLE.


                                    ARTICLE V
             CONDITIONS OF THE INVESTORS' OBLIGATIONS AT THE CLOSING

         The  obligations of the Investors  under this Agreement to purchase the
Shares from the Company are subject to the  fulfillment on or before the Closing
of each of the  following  conditions,  any of which may be waived in writing by
the Investors:

         5.1 Representations and Warranties.  The representations and warranties
of the Company contained in Article II of this Agreement shall be true on and as
of the Closing with the same effect as though such representation and warranties
had been made on and as of the Closing.

         5.2 Performance. The Company shall have performed and complied with all
agreements,  obligations  and  conditions  contained in this  Agreement that are
required to be performed or complied with by it on or before the Closing.

         5.3  Compliance  Certificate.  The Company shall have  delivered to the
Investors  a  certificate  dated as of the  Closing,  executed  by an  executive
officer of the  Company and in a form  reasonably  acceptable  to the  Investor,
certifying  that the  conditions  set  forth in  Sections  5.1 and 5.2 have been
satisfied  and that there has been no  material  adverse  change in the  assets,
properties,  prospects,  condition,  affairs,  operations  or  business  of  the
Company, as now conducted or as proposed to be conducted, since the date of this
Agreement.

         5.4  Proceedings  and  Documents.  All corporate and other  proceedings
taken by the Company in connection  with the  transactions  contemplated by this
Agreement and all documents incident thereto shall be reasonably satisfactory in
form and substance to the Investors,  and the Investors  shall have received all
such documents as it may have reasonably requested.

         5.5  Acquisition of  Convergence.  The Company shall have completed the
acquisition of Convergence Pharmaceuticals, Inc.

                               Page 24 of 41 pages

<PAGE>

         5.6 Opinion of Counsel.  The  Investors  shall have received an opinion
from the Company's counsel,  dated as of the Closing and in a form and substance
reasonably acceptable to the Investors, to the effect that:

         (a) The Company is a corporation  duly organized,  validly existing and
in good  standing  under the laws of the State of Delaware,  and the Company has
the requisite corporate power and authority to own its properties and to conduct
its business;

         (b) The  Company  has the  corporate  power and  authority  to execute,
deliver and  perform  its  obligations  under the terms of the  Agreement.  This
Agreement  has been duly  authorized,  executed and delivered by the Company and
constitutes a legal,  valid and binding  obligation  of the Company  enforceable
against  it in  accordance  with its  terms,  except  (i) as the  enforceability
thereof may be limited by  bankruptcy,  insolvency  or other laws relating to or
affecting  creditors'  rights  generally,   (ii)  as  rights  to  indemnity  and
contribution  may be limited  under  applicable  law or by  principles of public
policy and (iii) as such  enforceability  may be limited or  affected by general
principles of equity, whether applied by a court of law or equity;

         (c) The  execution,  delivery and  performance  by the Company with the
terms  of  this  Agreement  do  not  violate  any  provision  of  the  Company's
Certificate of Incorporation or By-laws and, to such counsel's knowledge, do not
conflict  with or  constitute a default  under the  provisions  of any judgment,
writ,  decree or order known to such counsel or any material  agreement to which
the  Company is a party or by which it is bound and which is filed as an exhibit
to, or incorporated by reference in, the Company's Form 10-K for the fiscal year
ended December 31, 1998, and the Company's Form 10-Q for the quarter ended March
31, 1999;

         (d) All  consents,  approvals,  orders or  authorizations  of,  and all
qualifications,  registrations, designations, declarations, or filings with, any
federal,  Delaware or Texas governmental  authority required to be made prior to
the Closing in connection with the consummation of the transactions contemplated
by this  Agreement  have  been made or  obtained,  and are  effective,  and such
counsel is not aware of any proceedings,  or threat thereof,  which question the
validity thereof;

         (e) Based in part upon the  representations  of the Investors set forth
in this  Agreement,  the offer and sale of the Shares  pursuant  to the terms of
this Agreement are exempt from the registration requirements of Section 5 of the
Securities Act;

         (f) To such  counsel's  knowledge,  there is no action,  proceeding  or
investigation  pending or threatened  against the Company,  which  questions the
validity of this Agreement, or any action be taken by the Company pursuant to or
in connection with the Agreement;

         (g) The Shares have been duly authorized and, when issued in compliance
with this Agreement,  will be fully paid and  non-assessable and will be free of
any liens or encumbrances created by the Company; and

                               Page 25 of 41 pages

<PAGE>

         (h) There are no  preemptive  rights with  respect to the  issuance and
sale of the Shares and there are no restrictions on transfer of the Shares other
than those arising under federal and state securities laws.

         5.7  SBA  Sideletter.  The  Company  shall  have  executed  the  letter
agreement between the Company,  Chase Venture Capital Associates,  L.P. and ILEX
Chase Partners (Alto Bio),  LLC attached  hereto as Exhibit 5.7 regarding  small
business matters (the "Small Business Sideletter").

                                   ARTICLE VI
             CONDITIONS OF THE COMPANY'S OBLIGATIONS AT THE CLOSING

         The  obligations  of the Company under this Agreement to issue and sell
the  Shares to the  Investor  are  subject to the  fulfillment  on or before the
Closing  of each of the  following  conditions,  any of which  may be  waived in
writing by the Company:

         6.1 Representations  and Warranties.  The representation and warranties
of each Investor contained in Article III and Article IV of this Agreement shall
be  true  on  and as of  the  Closing  with  the  same  effect  as  though  such
representations and warranties had been made on and as of the Closing.

         6.2 Payment of Purchase  Price.  The Investors shall at the Closing pay
the Purchase  Price upon delivery by the Company of a  certificate  representing
the Shares.


                                   ARTICLE VII
                      POST-CLOSING COVENANTS OF THE COMPANY

         With a view to making  available to the  Investors  the benefits of SEC
Rule 144 and any other rule or regulation of the SEC that may at any time permit
the  Investors  to  sell  securities  of  the  Company  to  the  public  without
registration,  the Company  agrees to use best efforts to file with the SEC in a
timely manner all reports and other documents  required of the Company under the
1933 Act and the 1934 Act.

                               Page 26 of 41 pages

<PAGE>

                                  ARTICLE VIII
                               REGISTRATION RIGHTS

         8.1  Registration  Rights.  As  soon  after  Closing  as is  reasonably
practicable,  the  Company  will use its  best  efforts  to file a  registration
statement  on Form S-3 (or any  successor  to Form  S-3) (or  other  appropriate
registration  statement) with the SEC and such  applications or other filings as
required under applicable state securities or blue sky laws sufficient to permit
the public  offering of the Shares to be made on a continuous  basis pursuant to
Rule 415 under  the 1933 Act,  and  shall  use its best  efforts  to cause  such
registration  statement  to be  declared  effective  so that the Shares  will be
registered for the offering on such Form.  Notwithstanding  the  foregoing,  the
Company shall not be obligated to effect a  registration  (i) in any  particular
jurisdiction in which the Company would be required to execute a general consent
to  service  of  process  in  effecting  such  registration,   qualification  or
compliance unless the Company is already subject to service in such jurisdiction
and except as may be  required  by the 1933 Act;  or (ii) if the  Company  shall
furnish to the  Investors a  certificate  signed by the President of the Company
stating that in the good faith judgment of the Board of Directors of the Company
the filing of a registration  statement would require the disclosure of material
information  that the Company has a bona fide business purpose for preserving as
confidential and that is not then otherwise  required to be disclosed,  then the
Company's  obligation to use its best efforts to file a  registration  statement
shall be  deferred  for a period  not to  exceed  180 days from the date of such
notice.

         8.2  Registration  Procedures and Expenses.  As provided in Section 8.1
hereof,  the Company shall, as  expeditiously as is reasonably  practicable,  do
each of the following:

                  (a)  prepare  and file with the SEC a  registration  statement
with respect to the Shares and,  subject to the  limitations  under  Section 8.1
hereof,  use its best  efforts to cause such  registration  statement  to become
effective and remain effective for two years as provided herein;

                  (b) cooperate with the Investors and any underwriter who shall
sell  the  Shares  in  connection  with  their  review  of the  Company  made in
connection with such registration;

                  (c)  prepare  and  file  with  the  SEC  such  amendments  and
supplements to such registration statement and the prospectus used in connection
therewith  as may be  necessary to keep such  registration  statement  effective
until the earlier to occur of the sale of all of the Shares by the  Investors or
the second anniversary of the effectiveness of the registration  statement,  and
to comply with the  provisions of the 1933 Act and the 1934 Act, with respect to
the  disposition  of all the Shares covered by such  registration  statement for
such period;

                  (d)  furnish  to the  Investors  such  number of copies of the
prospectus  forming  a part  of  such  registration  statement  (including  each
preliminary  prospectus),  in conformity with the  requirements of the 1933 Act,
and such other  documents as the  Investors may  reasonably  request in order to
facilitate the disposition of the Shares; and

                  (e)  notify  the  Investors,  at any  time  when a  prospectus
relating to the Shares is required  to be  delivered  under the 1933 Act, of the
happening  of any event as a result of which  the  prospectus  forming a part of
such registration  statement, as then in effect, includes an untrue

                               Page 27 of 41 pages

<PAGE>

statement of a material  fact or omits to state any material fact required to be
stated therein or necessary to make the statements therein not misleading in the
light of the circumstances then existing,  prepare and furnish to the Investor a
reasonable  number of  copies  of any  supplement  to or any  amendment  of such
prospectus  that  may be  necessary  so that,  as  thereafter  delivered  to the
purchasers of the Shares, such prospectus shall not include any untrue statement
of a  material  fact or omit to state a  material  fact  required  to be  stated
therein or necessary to make the  statements  therein not misleading in light of
the circumstances then existing.

         8.3  Agreement  by each  Investor.  In the  event  that  each  Investor
participates,  pursuant to this Article 8, in the  offering of the Shares,  such
Investor shall:

                  (a) furnish the Company all  material  information  reasonably
requested by the Company concerning the Investor and the proposed method of sale
or other  disposition of the Shares and such other  information and undertakings
as shall be reasonably required in connection with the preparation and filing of
the  registration  statement  covering  the  Shares  in  order  to  ensure  full
compliance  with  the  1933  Act  and  the  rules  and  regulations  of the  SEC
thereunder;

                  (b)   cooperate  in  good  faith  with  the  Company  and  its
underwriters,  if any, in connection with such  registration,  including placing
the Shares in escrow or custody to facilitate the sale and distribution thereof,
provided that such escrow or custody  arrangement  shall be no more  restrictive
upon the  Investors  than upon any other  holder of stock of the Company for the
benefit of whom such registration is undertaken; and

                  (c) make no  further  sales or other  dispositions,  or offers
therefor,  of the  Shares  under  such  registration  statement  if,  during the
effectiveness of such registration  statement, an intervening event should occur
which, in the opinion of counsel to the Company,  makes the prospectus  included
in such  registration  statement no longer  comply with the 1933 Act, so long as
written  notice  containing the facts and legal  conclusions  relied upon by the
Company in this regard has been  received  by each  Investor  from the  Company,
until such time as each Investor has received from the Company  copies of a new,
amended or supplemented prospectus complying with the 1933 Act, which prospectus
shall be delivered to the Investors by the Company as soon as practicable  after
such notice.

         8.4  Allocation  of  Expenses.  The  Company  shall  pay the  costs and
expenses  in  connection  therewith,  other  than  the  attorneys'  fees  of the
Investors;  provided,  however,  that the Investors  shall pay all  underwriting
discounts,  selling  commissions  and stock transfer taxes  attributable  to the
Shares under such registration statement.

         8.5  Indemnification.

              (a) Upon the  registration of any of the Shares under the 1933 Act
pursuant to Article 8 hereof,  each of the  Investors  registering  such shares,
severally and not jointly,  shall indemnify and hold harmless the Company,  each
director  and  officer  of the  Company,  each  underwriter  and any  person who
controls the Company or such underwriter  within the meaning of Section 5 of the
1933 Act, and the Company's accountants and legal counsel, against all

                               Page 28 of 41 pages

<PAGE>

expenses,  claims, losses, damages and liabilities (or actions or proceedings in
respect  thereof)  including any of the foregoing  incurred in settlement of any
commenced  or  threatened  litigation,  arising  out of or based upon any untrue
statement (or alleged  untrue  statement) of any material  fact, or omission (or
alleged  omission)  of any  material  fact  required  to be  stated  therein  or
necessary to make the statements therein, in light of the circumstances in which
they were made, not  misleading  contained in any such  registration  statement,
preliminary prospectus or final prospectus, offering circular or other document,
or any  amendment  or  supplement  thereto,  incident  to any such  registration
qualification or compliance,  if such statement or omission was made in reliance
upon and in conformity with  information  furnished in writing to the Company or
its underwriter by or on behalf of such Investor specifically for use therein.

                  (b) The Company will indemnify each Investor,  with respect to
which  registration,  qualification or compliance has been effected  pursuant to
this Agreement,  and each underwriter,  if any, and each person who controls any
underwriter  within  the  meaning  of  Section  5 of the 1933 Act,  against  all
expenses,  claims, losses, damages and liabilities (or actions or proceedings in
respect thereof),  including any of the foregoing  incurred in settlement of any
commenced  or  threatened  litigation,  arising  out of or based upon any untrue
statement (or alleged  untrue  statement)  of a material  fact  contained in any
registration statement,  prospectus, offering circular or other document, or any
amendment   or   supplement   thereof,   incident  to  any  such   registration,
qualification  or  compliance,  or arising out of or based upon any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements  therein,  in the light of the circumstances
in which they were made, not  misleading,  provided that the Company will not be
liable to indemnify  such  Investor(s)  or a underwriter in any such case to the
extent that any such claim, loss, damage,  liability or expense arises out of or
is based on any untrue  statement  or omission or alleged  untrue  statement  or
omission,  made in reliance upon and in conformity with information furnished in
writing  to  the  Company  by  or  on  behalf  of a  Investor  or a  underwriter
specifically for use therein.

                  (c) Each party entitled to indemnification  under this Section
8.5 (the "Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the  Indemnifying  Party to assume  the  defense of any such claim or any
litigation  resulting  therefrom,  provided  that  counsel for the  Indemnifying
Party,  who shall  conduct  the  defense  of such claim or  litigation  shall be
approved by the  Indemnified  Party (whose  approval shall not  unreasonably  be
withheld).  Without  limiting the generality of the foregoing,  the  Indemnified
Party may  withhold  its consent to any such counsel who also acts as counsel to
the  Indemnifying  Party  (with  respect  to such  claim  or  otherwise)  if the
Indemnified  Party reasonably  believes that there exists a conflict of interest
between the Indemnified  Party and the Indemnifying  Party, with respect to such
claim or  litigation.  In such  event,  the  Indemnifying  Party  shall bear the
expense of another  counsel who shall  represent the  Indemnified  Party and any
other persons or entities who have indemnification  rights from the Indemnifying
Party hereunder, with respect to such claim or litigation, and shall be selected
as provided in the first sentence of this Section 8.5(c).  The Indemnified Party
may  participate in such defense at such party's  expense  (except to the extent
that the  Indemnifying  Party is  required  to pay the  expense of such  counsel
pursuant to this Section  8.5(c),  and provided  further that the failure of any
Indemnified  Party to give  notice as  provided  herein  shall not

                               Page 29 of 41 pages

<PAGE>

relieve the Indemnifying  Party of its obligations under this Agreement,  unless
such failure causes material harm to the Indemnifying Party's defense such claim
or  litigation.  No  Indemnifying  Party,  in the  defense  of any such claim or
litigation, shall, except with the consent of each Indemnified Party, consent to
entry of any judgment or enter into any settlement  which does not include as an
unconditional  term  thereof  the giving by the  claimant or  plaintiff  to such
Indemnified  Party of a release from all liability with respect to such claim or
litigation.

                  (d) If the indemnification provided for in this Section 8.5(d)
is held by a court of competent jurisdiction to be unavailable to an Indemnified
Party with respect to any loss, liability,  claim, damage or expense referred to
therein,  then the Indemnifying  Party, in lieu of indemnifying such Indemnified
Party  hereunder,  shall  contribute  to the  amount  paid  or  payable  by such
Indemnified Party as a result of such loss,  liability,  claim damage or expense
in such  proportion  as is  appropriate  to reflect  the  relative  fault of the
Indemnifying  Party on the one hand and of the Indemnified Party on the other in
connection  with the  statements  or  omissions  which  resulted  in such  loss,
liability,  claim,  damage or  expense as well as any other  relevant  equitable
considerations.  The  relative  fault  of  the  Indemnifying  Party  and  of the
Indemnified  Party shall be  determined  by reference  to,  among other  things,
whether  the  untrue or  alleged  untrue  statement  of a  material  fact or the
omission  to state a material  fact  relates to  information  supplied  by or on
behalf of the  Indemnifying  Party or by the Indemnified  Party and the parties'
relative intent, knowledge,  access to information and opportunity to correct or
prevent such statement or omission.

                  (e)  Notwithstanding  the  foregoing,  to the extent  that the
provisions on  indemnification  and  contribution  contained in the underwriting
agreement entered into in connection with an underwritten public offering are in
conflict  with the foregoing  provisions,  the  provisions  in the  underwriting
agreement shall control.

                               Page 30 of 41 pages

<PAGE>

                                   ARTICLE IX
                                  MISCELLANEOUS

         9.1 Entire Agreement.  This Agreement (together with any attachments or
exhibits  including,  without  limitation,  the Registration  Rights  Agreement)
constitutes the entire agreement between the Company and the Investors  relating
to the subject matter hereof, and no party shall be liable or bound to the other
in  any  manner  by any  warranties,  representations  or  covenants  except  as
specifically set forth herein.

         9.2 Successors and Assigns.  The terms and conditions of this Agreement
shall inure to the benefit of and be binding upon the respective  successors and
assigns of the parties.  Except as expressly  provided in this Agreement and the
Registration Rights Agreement, nothing in this Agreement, express or implied, is
intended  to confer  upon any  party,  other  than the  parties  hereto or their
respective  successors  and  assigns,  any  rights,  remedies,   obligations  or
liabilities under or by reason of this Agreement.

         9.3 Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of Texas without application of the choice
of laws provisions of such laws.

         9.4  Counterparts.  This  Agreement  may be  executed  in  one or  more
counterparts,  each of  which  shall be  deemed  an  original,  but all of which
together shall constitute one and the same instrument.

         9.5 Headings.  The headings used in this Agreement are for  convenience
and shall not by themselves be  considered  in construing or  interpreting  this
Agreement.

         9.6 Notices.  Any notice required or permitted hereunder shall be given
in writing and shall be conclusively  deemed  effectively  given upon either (a)
personal  delivery;  (b) one day after  facsimile  transmission to the facsimile
number   indicated  below  and  evidenced  by  a  written  record  of  completed
transmission to such number; or (c) five days after deposit in the United States
mail,  by  registered  or  certified  mail,  postage  prepaid,  addressed to the
following  address,  or to such other  address as the party may designate by ten
(10) days' advance written notice to the other party:

         If to the Investors:

             At the address on the Company's stock ledger, or such other address
as may be provided by such Investor;

                               Page 31 of 41 pages

<PAGE>


         If to the Company:

                  ILEX Oncology, Inc.
                  11550 I.H. 10 West, Suite 100
                  San Antonio, Texas 78230
                  Attn:  President
                  Facsimile No: (210) 949-8227

         9.7  Survival  of  Warranties.  The  warranties,   representations  and
covenants of the parties  contained in or made pursuant to this Agreement  shall
survive the execution and deliver of this Agreement and the Closing and shall in
no way be affected by any  investigation  of the subject matter thereof by or on
behalf  of the  Investors;  provided,  however,  that such  representations  and
warranties  need only be accurate as of the date of such  execution and delivery
and as of the Closing.

         9.8 Finder's Fees. Each party agrees to indemnify and hold harmless the
other party from and against any liability for any commission or compensation in
the  nature of  investment  banking  or  finder's  fees in  connection  with the
transactions  contemplated  by this  Agreement  (and the costs and  expenses  of
defending   against  such  liability  or  asserted   liability)  for  which  the
indemnifying  party or any of its  officers,  employees  or  representatives  is
responsible.

         9.9 Expenses.  On the Closing Date, the Company will pay the reasonable
legal fees and expenses of the Investors up to $20,000,  in connection  with the
negotiation, execution, delivery and performance of this Agreement.

         9.10  Amendments  and  Waivers.  Except as  expressly  provided in this
Agreement,  any  provision of this  Agreement  may be amended only by the mutual
written  agreement  of the  parties  and  the  observance  of any  term  of this
Agreement may be waived (either generally or in a particular instance and either
retroactively  or  prospectively)  only in a written  document  executed  by the
waiving party.

         9.11 Severability. If one or more provisions of this Agreement are held
to be unenforceable  under applicable law, such provision shall be excluded from
this Agreement and the balance of this Agreement shall be interpreted as if such
provision  were so excluded  and shall be  enforceable  in  accordance  with its
terms.

         9.12  Regulatory  Matters.  Each Investor  agrees to cooperate with the
Company in all reasonable respects in complying with the terms and provisions of
the Small Business Sideletter, provided that no Investor shall be required under
this Section 9.12 to take any action that would adversely affect in any material
respect such  Investor's  rights under this Agreement or as a stockholder of the
Company.

                               Page 32 of 41 pages

<PAGE>

         IN WITNESS  WHEREOF the parties have executed this Agreement  effective
as of the day and year first above written.

                                   ILEX ONCOLOGY, INC.



                                   By:__________________________________________
                                            Richard L. Love
                                            President


                                   INVESTORS:

                                   ALTA BIOPHARMA PARTNERS, L.P.
                                   By: Alta BioPharma Management, LLC



                                   By:__________________________________________
                                                     Managing Partner

                                   ILEX CHASE PARTNERS (ALTA BIO), LLC
                                   By: Alta/Chase BioPharma Management, LLC



                                   By:__________________________________________
                                                     Member

                                   ALTA EMBARCADERO
                                     BIOPHARMA PARTNERS, LLC



                                   By:__________________________________________
                                            Member


                               Page 33 of 41 pages

<PAGE>

                                   CHASE VENTURE CAPITAL ASSOCIATES, L.P.

                                   By: ______________________________



                                   By:__________________________________________
                                            Managing Partner


                               Page 34 of 41 pages

<PAGE>





                                 ______________________________________________
                                  B. J. McCombs

                          ADVENT HEALTH CARE AND LIFE
                           SCIENCES II LIMITED PARTNERSHIP

                          By: Advent International Limited Partnership,
                                   General Partner
                          By: Advent International Corporation,
                                   General Partner


                                  By:___________________________________________
                                           Vice President/Senior
                                             Vice President


                          ADVENT HEALTH CARE AND LIFE
                           SCIENCES II BETEILIGUNG GMBH & CO. KG

                          By: Advent Health Care and Life Sciences II
                                   Verwaltungs GmbH, General Partner
                          By: Advent International Limited Partnership,
                                   Managing General Partner
                          By: Advent International Corporation, General Partner


                                  By: __________________________________________
                                           Vice President/Senior
                                             Vice President


                          ADVENT PARTNERS HLS II LIMITED PARTNERSHIP

                          By: Advent International Corporation, General Partner


                                  By:___________________________________________
                                           Vice President/Senior
                                             Vice President


                                         Page 35 of 41 pages

<PAGE>

                          ADVENT PARTNERS LIMITED PARTNERSHIP

                          By: Advent International Corporation, General Partner


                                   By:__________________________________________
                                            Vice President/Senior
                                              Vice President


                               Page 36 of 41 pages

<PAGE>

<TABLE>
                                   SCHEDULE A

                              SCHEDULE OF INVESTORS
<CAPTION>
- -----------------------------------------------------------------------------------------------

                                                                                    Aggregate
                                                          Number of Shares          Purchase
            Name and Address                               to be Purchased          Price ($)
- -----------------------------------------------------------------------------------------------
<S>                                                               <C>               <C>
Alta BioPharma Partners, L.P.                                     742,547           $6,215,859
- -----------------------------------------------------------------------------------------------

Alta Embarcadero BioPharma, LLC                                    27,988             $234,288
- -----------------------------------------------------------------------------------------------

ILEX Chase Partners (Alta Bio), LLC                               424,065           $3,549,852
- -----------------------------------------------------------------------------------------------

Chase Venture Capital Associates, L.P.                            238,920           $2,000,000
- -----------------------------------------------------------------------------------------------

B. J. McCombs                                                     119,460           $1,000,000
- -----------------------------------------------------------------------------------------------

Advent Health Care and Life Sciences II Limited
Partnership                                                       757,974           $6,345,000
- -----------------------------------------------------------------------------------------------

Advent  Health Care and Life  Sciences II
Beteiligung  GmbH & Co. KG                                         58,894             $493,000
- -----------------------------------------------------------------------------------------------

Advent Partners HLS II Limited Partnership                         16,844             $141,000
- -----------------------------------------------------------------------------------------------

Advent Partners Limited Partnership                                 2,509              $21,000
                                                                    -----               ------
- -----------------------------------------------------------------------------------------------

         TOTAL                                                  2,389,201          $20,000,000
                                                                =========          ===========
- -----------------------------------------------------------------------------------------------

</TABLE>

                               Page 37 of 41 pages

<PAGE>


                               Disclosure Schedule
                                       to
                            Stock Purchase Agreement
                                      among
                          the Company and the Investors
- --------------------------------------------------------------------------------

                                  Section 2.9
                                 Certain Changes

On May 26, 1999 the Board of Directors of ILEX approved a write-off of up to $20
million in largely non-cash value of investments in affiliates and certain other
non-productive assets and commitments in the CRO business.


                                  Section 2.11
                               Registration Rights

Registration Rights Agreement dated July 16, 1999, among ILEX Oncology, Inc. and
Shareholders of Convergence Pharmaceuticals, Inc.

Registration Rights Agreement dated January 22, 1999, among ILEX Oncology,  Inc.
and Eli Lilly and Company.

Registration  Rights  Agreement  dated as of July 9, 1997,  among ILEX Oncology,
Inc. and PRN Research, Inc.

Fourth Amended and Restated  Registration  Rights  Agreement  dated December 11,
1996.

                               Page 38 of 41 pages

<PAGE>
                                LETTER AGREEMENT



Alta BioPharma
One Embarcadero, Suite 4050
San Francisco, California 94111


         In connection with the closing of the transactions  contemplated by the
Stock Purchase  Agreement,  dated as of the __ day of July, 1999, by and between
the undersigned, ILEX Oncology, Inc., a Delaware corporation (the "Undersigned")

                                Management Rights

1.  Investor  shall be entitled  to consult  with and advise  management  of the
    Company on significant  business  issues,  including  management's  proposed
    annual  operating  plans,  and management will meet with Investor  regularly
    during each year at the Company's facilities at mutually agreeable times for
    such consultation and advice and to review progress in achieving said plans.

2.  Investor  may  examine  the books and records of the Company and inspect its
    facilities  and may request  information  at reasonable  times and intervals
    concerning  the general  status of the  Company's  financial  condition  and
    operations,   provided  that  access  to  highly  confidential   proprietary
    information and facilities need not be provided.

3   If Investor is not  represented  on the Company's  Board of  Directors,  the
    Company shall invite a representative of the Investor to attend all meetings
    of its Board of  Directors  in a nonvoting  observer  capacity,  and in this
    respect  shall  give such  representative  copies of all  notices,  minutes,
    consents and other  material  that it provides to its  directors;  provided,
    however,  that the Company reserves the right to exclude such representative
    from  access to any  material  or meeting or portion  thereof if the company
    believes upon advice of counsel that such exclusion is reasonably  necessary
    to preserve the  attorney-client  privilege,  to protect highly confidential
    proprietary  information or for other similar reasons.  Such  representative
    may participate in discussions of matters brought to the Board.

    Investor agrees,  and any representative of the Investor will agree, to hold
    in confidence and trust and not use or disclose any confidential information
    provided  to or  learned by it in  connection  with its  rights.  The rights
    described herein shall terminate upon the date that Alta BioPharma Partners,
    L.P. no longer owns 50% (fifty  percent) of the shares of ILEX Common  Stock
    it is  purchasing  pursuant to the Stock  Purchase  Agreement  to which this
    letter agreement is being entered into.

    Investor will not purchase or sell the  Company's  stock while in possession
    of material information that has not been publicly disseminated.


                               Page 39 of 41 pages

<PAGE>

    The rights described herein are nonassignable.

    The investor, Alta BioPharma Partners, L.P., requires that the Company be in
    compliance with the terms of the Investments  Relating To Certain Countries,
    the  Indemnification  of Alta BioPharma  Partners,  L.P. and the Indemnified
    Parties,   and  the   SuperFund   requirements   of  CERCLA   (Comprehensive
    Environmental Response Compensation and Liability Act):

INVESTMENTS RELATING TO CERTAIN FOREIGN COUNTRIES
     The  Company  has  not  participated  and  is  not   participating  in,  an
     anti-Israeli  boycott within the scope of chapter 7 of Part 2 of Division 4
     of Title 2 of the  California  Government  Code as in  effect  from time to
     time.

INDEMNIFICATION
     The Company will use its reasonable efforts to limit the liability,  to the
     fullest extent  permissible under the governing law of such company's state
     of incorporation,  of any director  representing  Alta BioPharma  Partners,
     L.P. and each of his or her affiliated parties.

CERCLA
SUPERFUND REQUIREMENTS
1    The Company has not caused or allowed,  nor has the Company contracted with
     any party for, the generation, use, transportation,  treatment,  storage or
     disposal of any  Hazardous  Substances  (as defined  below),  other than in
     accordance with the  Environmental  Laws, in connection with the operations
     of its business or otherwise.

2.   The Company, the operations of its business, and any real property that the
     Company owns, leases, or otherwise occupies or uses (the "Premises") are in
     compliance  with all applicable  Environmental  Laws (as defined below) and
     orders or directives of any governmental  authorities  having  jurisdiction
     under  such  Environmental   Laws  including,   without   limitation,   any
     Environmental  Laws or orders or directives  with respect to any cleanup or
     remediation of any release or threat of release of Hazardous Substances.

3.   The Company  has not  received  any  citation,  directive,  letter or other
     communication, written or oral, or any notice of any proceedings, claims or
     lawsuits,  from any person, entity or governmental authority arising out of
     the  ownership  or  occupation  of  the  Premises,  or the  conduct  of its
     operations, nor is it aware of any basis thereof.

4.   The Company has  obtained and is  maintaining  in full force and effect all
     necessary  permits,  licenses and approvals  required by any  Environmental
     Laws  applicable  to the  Premises and the  business  operations  conducted
     thereon (including  operations conducted by tenants on the Premises) and is
     in compliance with all such permits, licenses and approvals.

                               Page 40 of 41 pages

<PAGE>

ALTA BIOPHARMA PARTNERS


5.   The Company has not caused,  or allowed a release,  or a threat of release,
     of any Hazardous Substance unto, nor to the best of the Company's knowledge
     has the Premises or any property at or near the Premises  ever been subject
     to a release, or a threat of a release, of any Hazardous Substance.

The term,  "Environmental  Laws"  shall  mean any  federal,  state or local law,
ordinance or  regulation  pertaining  to the  protection  of human health or the
environment  including,  without  limitation,  the  Comprehensive  Environmental
Response,  Compensation  and Liability  Act, 42 U.S.C.  Sections  9601, et seq.,
Emergency Planning and Community Right-to-Know Act, 42 U.S.C. Sections 11001, et
seq., and the Resource  Conservation and Recovery Act, 42 U.S.C.  Sections 6901,
et seq.

     The  term,  "Hazardous  Substance"  includes  oil and  petroleum  products,
asbestos,  polychlorinated  biphenyls  and  urea  formaldehyde,  and  any  other
materials classified as hazardous or toxic under any Environmental Laws.

           1. QUALIFIED SMALL BUSINESS

The Company  represents  and warrants to the Investor  that,  to the best of its
knowledge,  the Company is a "qualified  small  business"  within the meaning of
Section  1202(d) of the Internal  Revenue Code of 1986, as amended (the "Code"),
as of the date hereof,  the shares being acquired by Investor  should qualify as
"qualified small business stock" as defined in Section 1202(c) of the Code as of
the date hereof.  The Company  further  represents  and warrants that, as of the
date hereof,  it meets the "active  business  requirement" of Section 1202(d) of
the Code,  and it as made no  "significant  redemptions"  within the  meaning of
Section  1202(c)(3)(B)  of the Code. The Company will use reasonable  efforts to
comply with the reporting and recordkeeping  requirements of Section 1202 of the
Code,  any  regulations  promulgated  thereunder  and any similar state laws and
regulations.  The  Company  further  agrees not to  repurchase  any stock of the
Company if such repurchase would cause the shares being acquired by Investor not
to so  qualify  as a  "qualified  small  business  stock"  unless  the  Board of
Directors  determines  that  such  repurchase  is in the best  interests  of the
Company.

     I  ACKNOWLEDGE  AND AGREE TO THE TERMS OF THIS  DOCUMENT  IN REGARDS TO THE
ALTA BIOPHARMA PARTNERS L.P. MANAGEMENT RIGHTS,  INVESTMENTS RELATING TO CERTAIN
FOREIGN COUNTRIES, INDEMNIFICATION AND THE CERCLA REQUIREMENTS.


DATE: ________________________                    By: __________________________

                                                  Title: _______________________

                               Page 41 of 41 pages




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