EXHIBIT 99.6


                               EXCHANGE AGREEMENT

     This EXCHANGE AGREEMENT (the "Exchange Agreement") is entered into as of
this ____ day of _______________, 2002 (the "Effective Date") between US
Oncology, Inc., a Delaware corporation (the "Company"), and JPMORGAN CHASE BANK,
a New York banking corporation (the "Exchange Agent").

                                    RECITALS

     A. This Exchange Agreement is entered into in connection with the offer by
the Company (the "Exchange Offer") to exchange $175,000,000 principal amount of
its 9 5/8 Senior Subordinated Notes due 2012 (the "Exchange Notes"), which have
been registered under the Securities Act of 1933, as amended, pursuant to a
Registration Statement on Form S-4 (File No. 333-_________), as may be amended
(the "Registration Statement"), filed with the Securities and Exchange
Commission, for each $175,000,000 principal amount of its outstanding 9 5/8
Senior Subordinated Notes due 2012 (the "Old Notes" and, together with the
Exchange Notes, the "Notes") tendered pursuant to the terms and conditions set
forth in the final prospectus dated ___________, 2002 (the "Prospectus"), the
related Letter of Transmittal (the "Letter of Transmittal") and, if applicable,
the Notice of Guaranteed Delivery (the "Notice of Guaranteed Delivery")
described in Section 2 below. Capitalized terms used herein and not defined
shall have the respective meanings ascribed to them in the Prospectus or the
Letter of Transmittal.

     B. Holders (as hereinafter defined) may tender some or all of their Old
Notes in exchange for Exchange Notes (the "Exchange"), which Notes are issued
pursuant to that certain Indenture dated as of February 1, 2002, by and between
the Company and JPMorgan Chase Bank, as Trustee.

     C. The Exchange Offer is expected to be commenced by the Company on or
about ___________, 2002. Unless sooner terminated by the Company, the Exchange
Offer shall expire at 5:00 p.m., New York City time, on ______, 2002 or on such
later date and time to which the Company may, in its sole discretion, extend the
Exchange Offer (as may be extended, the "Expiration Date"). The Company
expressly reserves the right to extend the Exchange Offer from time to time as
provided in the Letter of Transmittal and may extend the Exchange Offer by
giving oral (confirmed in writing) or written notice to the Exchange Agent
before 9:00 a.m., New York City time, on the next business day after the
previously scheduled Expiration Date.

     D. The Company expressly reserves the right, in its sole discretion, to
amend or terminate the Exchange Offer, and not to accept for exchange any Old
Notes not theretofore accepted by the Company for exchange. The Company will
give oral (confirmed in writing) or written notice of any amendment, termination
or nonacceptance to the Exchange Agent as promptly as practicable.

                                   AGREEMENTS

     Section 1.  APPOINTMENT OF EXCHANGE AGENT.  The Exchange Agent is hereby
appointed by the Company to serve as the exchange agent in connection with the
Exchange Offer and the Exchange Agent hereby accepts such appointment.  By
accepting such appointment, the Exchange Agent hereby agrees:  (a) to effect the
Exchange in accordance with the terms and


conditions set forth in the Letter of Transmittal and this Exchange Agreement;
and (b) to act as agent for the holders (individually, a "Holder" and
collectively, the "Holders") of the Old Notes identified in the register for the
Old Notes in connection therewith.

     Section 2.  DELIVERY OF DOCUMENTS.  The Company shall deliver the following
documents (collectively, the "Exchange Documents") to the Exchange Agent prior
to the commencement of the Exchange Offer:

          (a) the Prospectus;

          (b) the form of the Letter of Transmittal to be used by the Holders in
     tendering Old Notes for surrender in connection with the Exchange Offer;

          (c) the form of the Notice of Guaranteed Delivery to be used, if
     applicable, by the Holders in tendering Old Notes for surrender in
     connection with the Exchange Offer;

          (d) the form of Letter to Registered Holders and Depository Trust
     Company Participants; and

          (e) the form of Letter to Clients.

     Any inconsistency between this Exchange Agreement, on the one hand, and the
Exchange Documents (as they may be amended from time to time), on the other
hand, shall be resolved in favor of the Exchange Documents, except with respect
to the duties, liabilities and indemnification of the Exchange Agent, which
shall be controlled by this Exchange Agreement.

     Section 3. BOOK-ENTRY TRANSFER ACCOUNT. The Exchange Agent will, within two
business days after the date of the Prospectus, notify The Depository Trust
Company ("DTC") of the Exchange Offer with respect to the Old Notes. Any
financial institution that is a participant in DTC's systems may, until the
Expiration Date, make book-entry delivery of the Old Notes by causing DTC to
transfer such Old Notes to the Exchange Agent in accordance with DTC's Automated
Tender Offer Program ("ATOP").

     Section 4. MAILING TO HOLDERS. The Company shall mail or cause to be mailed
by first class mail or overnight mail by a reputable courier to each Holder and
to participants in DTC's book-entry system (pursuant to information provided by
DTC) one or more copies of each of the Exchange Documents on the day that the
Registration Statement has become effective under the Securities Act of 1933, as
amended, or as soon thereafter as reasonably practicable. Thereafter, at the
request of a Holder or an entity acting on behalf of a Holder or such
participant, the Company shall mail or cause to be mailed additional copies of
any one or more of the Exchange Documents to such Holder, entity or participant.

     Section 5. EXCHANGE PROCEDURE.

          (a) If the Old Notes are held through DTC's book-entry system, DTC
     shall receive from each DTC participant in accordance with DTC's ATOP,
     notice of a Holder's book-entry tender of its Old Notes for an equal
     principal amount of Exchange Notes as provided in Section 3. Such book-
     entry tender shall be in lieu of physical

                                                                               2


     delivery by such Holders of original Letters of Transmittal and
     certificates representing Old Notes; provided, however, that by tendering
     Old Notes pursuant to DTC's ATOP, such Holder agrees to be bound by the
     terms of the Letter of Transmittal as if such Holder had signed and
     physically delivered such document to the Exchange Agent.

          (b) If the Old Notes are held other than through DTC, the Exchange
     Agent shall receive the Old Notes being tendered, executed Letters of
     Transmittal, executed Notices of Guaranteed Delivery (if applicable), and
     any other documents required to be delivered in connection therewith, and
     shall examine the Old Notes, executed Letters of Transmittal, any Notices
     of Guaranteed Delivery and the other documents delivered or mailed to the
     Exchange Agent to ascertain whether they appear to be properly completed
     and executed in accordance with the instructions set forth in the Letter of
     Transmittal.

     Old Notes shall be considered properly tendered to the Exchange Agent only
if (i) tendered prior to the Expiration Date in the manner described in clause
(a) or (b) above and in accordance with the instructions set forth in the Letter
of Transmittal; (ii) the Company shall have provided its written notice of
acceptance for exchange of such Old Notes pursuant to clause (d) below; (iii)
such tenders of Old Notes have not been withdrawn in accordance with the terms
of the Exchange Offer; and (iv) if tender of such Old Notes is made pursuant to
the guaranteed delivery procedures contained in the Prospectus, the Old Notes
are received by the Exchange Agent within three (3) New York Stock Exchange
trading days after the Expiration Date.

     In the event any Letter of Transmittal or other document has been
improperly completed or executed or is not in proper form for tender (as
required by the instructions stated in the Letter of Transmittal), or if some
other irregularity in connection with the tender (whether pursuant to DTC's ATOP
or otherwise) of any of the Old Notes exists, the Exchange Agent shall consult
with an Authorized Representative (as defined in Section 7 hereof) as to proper
action to take to correct such irregularity, except that no such consultation
shall be necessary with respect to any such irregularity that is of a routine
nature and that is cured by the appropriate party delivering to the Exchange
Agent the items necessary for cure pursuant to the Exchange Agent's
instructions.  The Exchange Agent is authorized, and hereby agrees, to waive any
irregularity in connection with the tender of any of the Old Notes by any Holder
with the approval of an Authorized Representative.

     Determination of all questions as to any irregularity or the proper
completion, execution or delivery of any documents or instruments required in
connection with the Exchange Offer shall be made by the Company, in its sole
discretion, and such determination shall be final and binding.  The Company
shall have the absolute right to determine whether to reject any or all of the
tendered Old Notes not in proper form or to waive any irregularities or
conditions, and the Company's interpretation of the Letter of Transmittal (and,
if applicable, Notice of Guaranteed Delivery) and any other Exchange Documents
shall be final and binding.  Notwithstanding anything to the contrary herein, no
Old Note may be accepted for exchange until the Company shall have given the
Exchange Agent written notice of its acceptance for exchange of such Old Note.

                                                                               3


          (c) The Exchange Agent shall provide by facsimile or electronic
     transmission or telephone, as provided in Section 13, to such person or
     persons as the Company may request, reports as and when tender activity
     occurs up to and including the Expiration Date as to the aggregate
     principal amount of Old Notes which have been tendered pursuant to the
     Exchange Offer and the items received by the Exchange Agent pursuant to the
     Exchange Offer and this Exchange Agent Agreement, separately reporting and
     giving cumulative totals as to items properly received and items improperly
     received. In addition, the Exchange Agent will also inform, and cooperate
     in making available to, the Company or any such other person or persons
     upon oral request made from time to time prior to or on the Expiration Date
     of such other information as it or he or she reasonably requests. Such
     cooperation shall include, without limitation, the granting by the Exchange
     Agent to the Company and such person or persons as the Company may request
     of access to those persons on the Exchange Agent's staff who are
     responsible for receiving tenders in order to ensure that immediately prior
     to the Expiration Date the Company shall have received information in
     sufficient detail to enable it to decide whether to extend the Exchange
     Offer. If and to the extent that Old Notes are duly tendered pursuant to
     the exchange procedures described above in this Section 5 and the Letter of
     Transmittal, the Exchange Agent shall request the Company to accept such
     Old Notes for exchange and to issue the Exchange Notes to which such
     Holders are entitled. Such request shall be substantially in the form of
     Exhibit A hereto.

          (d) The Company, upon receipt of the request described in the
     immediately preceding clause (c) from the Exchange Agent, shall (i) provide
     written notice to the Exchange Agent of whether the Company accepts such
     Old Notes for exchange and (ii) if so, issue the Exchange Notes to which
     such Holders are entitled and deliver the same to the Trustee for
     authentication. JPMorgan Chase Bank, acting in its capacity as Trustee
     under the Indenture, shall promptly cancel the Old Notes being exchanged
     for such Exchange Notes, authenticate such Exchange Notes and deliver such
     authenticated Exchange Notes to the appropriate parties, or, in the case of
     a global Exchange Note registered in the name of a nominee of DTC, retain
     such global Exchange Note as the custodian for DTC pursuant to the
     Indenture.

          (e) If the Company does not accept for exchange all or part of the Old
     Notes tendered, the Exchange Offer is terminated, Old Notes are tendered
     but properly withdrawn or partial tenders are made, the Exchange Agent
     shall promptly return certificates for unexchanged Old Notes (or affect
     appropriate book-entry transfer) to the persons who deposited them (or
     affected such book-entry transfer) or, to the extent required, the Exchange
     Agent shall submit to the Company a request for reissuance to, or upon the
     order of, the tendering Holder of certificates for the unexchanged Old
     Notes. Such certificates shall be returned by the Company to the Exchange
     Agent for distribution to the appropriate Holders of the Old Notes.

          (f) The Exchange Agent may (but shall have no obligation to) take any
     and all other actions it deems necessary or appropriate as the Exchange
     Agent in connection with the Exchange Offer and under the customs and
     practices normally applied to such transactions and arrangements; provided
     however, that it is understood and agreed that the Exchange Agent shall
     have no duty or obligation in its capacity as Exchange Agent

                                                                               4


     except for those specifically contemplated herein or as may be subsequently
     agreed to in writing between the Exchange Agent and the Company.

     Section 6. DOCUMENT RETENTION. The Letters of Transmittal (and, if
applicable, Notices of Guaranteed Delivery), book-entry confirmations, and any
other tender documents and the Old Notes shall be recorded by the Exchange Agent
as to the date and time of receipt and shall be preserved and retained by the
Exchange Agent until delivered to the Company or otherwise disposed of in
accordance with the Company's instructions or the provisions of this Exchange
Agreement. Upon the termination of this Exchange Agreement pursuant to Section
14 or upon the instruction of the Company, the Exchange Agent shall promptly
forward to the Company any certificates for Old Notes, funds or property then
held by the Exchange Agent in such capacity.

     Section 7. INSTRUCTIONS. The Exchange Agent may rely and act on any
instructions from any Authorized Representative with respect to all matters
pertaining to this Exchange Agreement and the transactions contemplated hereby.
"Authorized Representative" is hereby defined as the Chairman of the Board, the
President, the Chief Executive Officer, any Vice President, the Chief Financial
Officer, the Treasurer or any Assistant Treasurer of, and legal counsel to, the
Company.

     Any instructions given to the Exchange Agent orally by any Authorized
Representative shall be confirmed in writing (including by facsimile
transmission) by such Authorized Representative as soon as reasonably
practicable.  The foregoing notwithstanding, the Exchange Agent shall not be
liable or responsible and shall be fully authorized and protected from acting,
or failing to act, in accordance with any oral instructions that do not conform
with the written confirmation received in accordance with this section after
such action or omission.

     Section 8. PAYMENT FOR SERVICES RENDERED AND EXPENSES. For services
rendered as the Exchange Agent hereunder, the Exchange Agent shall be entitled
to compensation as set forth in Exhibit B hereto. The Exchange Agent will
present the Company with an invoice for payment promptly after termination of
this Exchange Agreement as provided in Section 14. The Company shall make
payment as soon as practicable after receipt of the invoice.

     Section 9.  EXCULPATION.  The Exchange Agent shall:

          (a) have no obligation to expend its own funds with respect to the
     Exchange Offer or any of its duties hereunder or to otherwise make payment
     with respect to any tendered Old Note or any Exchange Note distributed
     hereunder;

          (b) have no duties or obligations other than those specifically
     contemplated herein, or as may subsequently be agreed to in writing by the
     Exchange Agent and the Company;

          (c) not be required to make and shall make no representations as to
     and shall have no responsibilities regarding the determination of the
     validity, sufficiency, value or genuineness of any Old Note tendered in the
     Exchange Offer (other than verification of the principal amounts reflected
     on the Old Notes tendered to the Exchange Agent in connection with the
     Exchange Offer) and will not be required to make and shall not make

                                                                               5


     any representations as to the validity, value or genuineness of the
     transactions contemplated by the Exchange Offer or in the Exchange
     Documents or as to the accuracy or otherwise as to any of the terms of the
     Exchange Documents;

          (d) not be obligated to take any legal action hereunder that might in
     the Exchange Agent's reasonable judgment involve any expenses or liability,
     unless the Exchange Agent has been furnished with reasonable indemnity
     therefor from the Company;

          (e) not be liable for any lost profits, lost savings or other special,
     exemplary or consequential damages;

          (f) conclusively rely on, and act upon, any instrument, opinion,
     notice, certificate, letter, facsimile transmission, telegram or other
     document delivered to the Exchange Agent in accordance with this Exchange
     Agreement or the Letter of Transmittal and reasonably and in good faith
     believed by it to be genuine and to have been signed by the proper party or
     parties;

          (g) conclusively rely on and shall be fully protected by the Company
     in acting in accordance with the written or oral instructions of any
     Authorized Representative with respect to any matter relating to the
     Exchange Agent's actions specifically covered by this Exchange Agreement;
     and

          (h) be permitted to consult with counsel satisfactory to the Exchange
     Agent and the written advice or opinion of such counsel shall be full and
     complete authorization and protection in respect of any action taken,
     suffered or omitted by the Exchange Agent hereunder and under any of the
     Exchange Documents in good faith and in accordance with such written advice
     or opinion of such counsel.

     Section 10. LIABILITY OF EXCHANGE AGENT; INDEMNIFICATION. The Exchange
Agent and its officers, directors, employees, agents, subsidiaries and
affiliates shall not be liable for any action taken or suffered by the Exchange
Agent or such agent of the Exchange Agent reasonably and in good faith in
accordance with the Exchange Offer, this Exchange Agreement, the Exchange
Documents or the instructions of any Authorized Representative, other than any
liability arising out of the negligence, willful misconduct or bad faith of the
Exchange Agent or such other persons or entities. The Company hereby covenants
and agrees to indemnify and hold the Exchange Agent and its officers, directors,
employees, agents, subsidiaries and affiliates harmless from and against any
fees, costs, expenses (including reasonable expenses of legal counsel), losses,
liabilities, claims or damages (collectively the "Indemnified Liabilities"),
which without negligence, willful misconduct or bad faith on its part or the
part of any other such persons or entities, may be paid, incurred or suffered by
it, or to which it may become subject, in any such case by reason of or as a
result of the administration or performance of the Exchange Agent's duties
hereunder or under any Exchange Document, or by reason of or as a result of the
Exchange Agent's compliance with the instructions set forth herein or with any
written or oral instruction delivered to it in accordance with the terms hereof,
or as a result of defending itself against any claim or liability resulting from
its actions as Exchange Agent hereunder or under any of the Exchange Documents,
including any claim against the Exchange Agent by any

                                                                               6


Holder, beneficial owner or other person or entity. To the extent any indemnity
contained herein is contrary to or unenforceable under applicable law, the
Company hereby agrees to contribute to the Exchange Agent the maximum amount of
the Indemnified Liabilities permitted under applicable law. The Exchange Agent
shall be entitled to participate at its own expense in the defense of any such
action, proceeding, suit or claim.

     In no case shall the Company be liable under this indemnity with respect to
any claim against the Exchange Agent or any other indemnified person or entity
unless the Company shall be notified by the Exchange Agent, by letter or by
facsimile confirmed by letter, of the assertion of a claim against the Exchange
Agent or any other indemnified person or entity or any other action commenced
against the Exchange Agent or any other indemnified person or entity, promptly
after the Exchange Agent or any other indemnified person or entity shall have
become aware of such assertion or received notice of commencement of such
action.  The Company shall be entitled to participate at its own expense in the
defense of any such claim or other action, and, if the Company so elects, the
Company shall assume the defense of any pending or threatened suit brought to
enforce any such claim.  In the event that the Company shall assume the defense
of any such suit, the Company shall not be liable for any subsequently incurred
fees and expenses of any counsel retained by the Exchange Agent or any other
indemnified person or entity so long as the Company shall retain counsel
reasonably satisfactory to the Exchange Agent to defend such suit, and so long
as the Exchange Agent has not determined, in the Exchange Agent's reasonable
judgment, based upon the advice of counsel, that a conflict of interest exists
between the Exchange Agent and the Company.  Notwithstanding anything herein to
the contrary, the Exchange Agent shall not enter into any settlement or other
compromise with respect to any losses, liabilities, costs or expenses for which
the Exchange Agent or any other indemnified party is seeking indemnification
hereunder without the prior written consent of the Company, which shall not be
unreasonably withheld or delayed.

     Section 11. NO SET-OFF. The Exchange Agent hereby expressly waives any
lien, encumbrance or right of set-off whatsoever that the Exchange Agent may
have with respect to any funds deposited with the Exchange Agent for the payment
of transfer taxes for compensation owed to the Exchange Agent hereunder.

     Section 12. GOVERNING LAW; SUCCESSORS AND ASSIGNS. This Exchange Agreement
shall be construed and enforced in accordance with the laws of the State of New
York without regard to conflicts of laws principles that would result in the
application of the laws of another state. This Exchange Agreement shall be
binding upon and inure solely to the benefit of each party hereto and nothing in
this Exchange Agreement, express or implied, is intended to or shall confer upon
any other person any right, benefit or remedy of any nature whatsoever under or
by reason of this Exchange Agreement. Without limitation of the foregoing, the
parties hereto expressly agree that no holder of Old Notes or Exchange Notes
shall have any right, benefit or remedy of any nature whatsoever under, or by
reason of, this Exchange Agreement. Neither party may assign its rights or
obligations hereunder without the prior written consent of the other party
hereto, which consent shall not be unreasonably withheld or delayed.

     Section 13. NOTICES. Unless otherwise provided herein, all reports, notices
and other communications required or permitted to be given hereunder shall be in
writing, shall be

                                                                               7


effective only upon receipt by the party addressed, and shall be delivered by
hand, overnight delivery, first-class mail, postage prepaid, electronic means or
facsimile as follows:


     IF TO THE COMPANY:

     US Oncology, Inc.
     16825 Northchase Drive, Suite 1300
     Houston, Texas  77060
     Attention:  Phillip H. Watts

     Telephone:  (832) 601-6188
     Telecopy:   (832) 601-6688

     IF TO THE EXCHANGE AGENT:

     JPMorgan Chase Bank
     600 Travis Street, Suite 1150
     Houston, Texas  77002
     Attention:  Gary Jones

     Telephone:  (713) 216-6877
     Telecopy:   (713) 577-5200

     Section 14. TERMINATION. Unless terminated earlier by mutual agreement of
the parties hereto or unless the Exchange Agent or the Company has not fully and
completely performed its respective obligations under this Exchange Agreement,
this Exchange Agreement shall automatically terminate 30 days after the
Expiration Date. Notwithstanding the foregoing, Sections 8, 10, 11, 12, 13 and
14 shall survive such termination. Notwithstanding Section 1 hereof, in the
event the Exchange Offer is terminated by the Company, this Exchange Agreement
shall also terminate, provided that the Company shall reimburse the Exchange
Agent for all Additional Expenses set forth on Exhibit B hereto incurred by the
Exchange Agent in connection with this Exchange Agreement and/or the Exchange
Documents, and Sections 10, 11, 12, 13 and 14 shall survive the termination of
this Exchange Agreement. Upon the termination of this Exchange Agreement, except
as provided in this Section 14, this Exchange Agreement shall be of no further
force and effect, without liability of any of the parties hereto, provided,
however, that nothing herein shall relieve a party from liability for any breach
prior to such termination. The Exchange Agent shall promptly forward any Letters
of Transmittal, Old Notes and other related documents received by the Exchange
Agent after the date of termination to the Company.

     Section 15. ENTIRE AGREEMENT; AMENDMENT. This Exchange Agreement represents
the complete and final agreement between the parties with respect to its subject
matter and may not be amended or waived, in whole or in part, except by an
instrument in writing signed by each of the parties.

     Section 16. COUNTERPARTS. This Exchange Agreement may be executed in any
number of counterparts and by the different parties on separate counterparts,
and each such counterpart shall be deemed to be an original, but all such
counterparts shall together constitute but one and the same Exchange Agreement.

                                                                               8


     Section 17. SEVERABILITY. In case any provision of this Exchange Agreement
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

                            [SIGNATURE PAGE FOLLOWS]

                                                                               9


                              US ONCOLOGY, INC.

                              By:
                                 ------------------------
                              Name:
                                    ---------------------
                              Title:
                                    ---------------------


                              JPMORGAN CHASE BANK,
                                 as Exchange Agent

                              By:
                                 ------------------------
                              Name:  John G. Jones
                              Title  Vice President and Trust Officer



                     [SIGNATURE PAGE TO EXCHANGE AGREEMENT]

                                                                              10


                                   EXHIBIT A

                                Exchange Request

                                     [Date]

 Re:  US Oncology, Inc. ("Company") exchange of its outstanding 9 5/8 Senior
      Subordinated Notes due 2012 (the "Old Notes") for 9 5/8 Senior
      Subordinated Notes due 2012 that have been registered under the Securities
      Act of 1933 (the "Exchange Notes") as contemplated in the Prospectus dated
      _____________, 2002.

     Pursuant to the Exchange Agreement dated as of _______ __, 2002, we have
received tenders of Old Notes and other necessary documents, representing
$________ aggregate principal amount of the Old Notes, and we hereby request the
Company to accept such tendered Old Notes and to issue Exchange Notes in like
principal amount to such Holders as follows:

     Please notify us of acceptance and issue the Exchange Notes.

     All documents received by the Exchange Agent which are related to the
tender of such Old Notes are available for inspection at 2001 Bryan Street, 9th
Floor, Dallas, Texas 75201.

     Upon completion of this exchange, the aggregate principal amount of Old
Notes outstanding will be $___________.

                              Very truly yours,

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                                   EXHIBIT B

EXCHANGE AGENT FEES

$3,500.00  For those duties specified in this Exchange Agreement.

Additional time spent on duties not anticipated above will be billed at $175 per
hour.

ADDITIONAL EXPENSES

Out-of-pocket expenses are in addition to fees quoted above.  This includes, but
is not limited to, reasonable legal fees and expenses, wire charges, printing
costs, overnight delivery charges, postage, long distance telephone charges and
any travel costs.

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