EXHIBIT 1.1


[RBC LOGO] RBC
           Capital
           Markets

                                                                   July 28, 2004


CONFIDENTIAL
- ------------

Cynthia L. Sullivan
President and Chief Executive Officer
Immunomedics, Inc.
300 American Road
Morris Plains, NJ 07950

Dear Cindy:

The purpose of this letter agreement (the "Agreement") is to set forth the terms
of the engagement by Immunomedics, Inc. (the "Company") of RBC Capital Markets
Corporation ("RBC") to act as exclusive placement agent to the Company with
respect to, and to assist the Company in connection with, a Transaction (as
hereinafter defined).

1.    Engagement. The Company hereby engages RBC exclusively to render
      investment-banking services to the Company concerning a potential offering
      of the Company's debt or equity securities or any combination thereof (the
      "Securities") pursuant to a registration statement under the Securities
      Act of 1933, as amended (the "Securities Act"), of up to U.S.$20 million
      ("Transaction" or "Registered Placement"). The final terms of the
      Registered Placement, however, will be negotiated between the Company and
      the investors who purchase Securities in the Registered Placement. RBC
      hereby accepts such engagement on a "reasonable efforts" basis upon the
      terms and conditions set forth herein. This Agreement shall not give rise
      to any commitment by RBC to purchase any of the Securities, and RBC shall
      have no authority to bind the Company. This Agreement shall not give rise
      to any commitment by the Company to engage RBC with respect to any matter
      other than a Transaction, and RBC shall have no authority to bind the
      Company or to take any action with respect to any matter other than a
      Transaction.

2.    Term. The term of this Agreement shall run for six months from the date of
      this letter, and may be extended by mutual consent of the parties, subject
      to the provisions set forth below in the section captioned Termination
      (the "Term").

3.    Services to be Provided by RBC. In undertaking this assignment, RBC will
      provide the following services to the Company in connection with a
      Transaction, subject to the provisions set forth below in the sections
      captioned Certain Agreements of the Company



Immunomedics, Inc.
July 28, 2004
Page 2


      and Termination:

      (a)   familiarize itself, to the extent it deems feasible and appropriate,
            with the historical and projected business and financial performance
            of the Company;

      (b)   formulate a strategy for consummating a Transaction, including the
            identification of parties that may have an interest in a Transaction
            with the Company, and develop procedures and timetables for
            implementing a Transaction;

      (c)   cooperate with the Company in the preparation of its prospectus
            supplement for use in connection with a Transaction;

      (d)   in connection with a Transaction, approach Interested Parties (as
            hereinafter defined), provide such Interested Parties with the
            prospectus supplement, and coordinate due diligence investigations
            of the Company by such Interested Parties;

      (e)   assist the Company in evaluating proposals from Interested Parties
            regarding a possible Transaction, including, without limitation, in
            connection with deal terms and pricing parameters; and

      (f)   in connection with a Transaction, formulate negotiation strategies
            and assist in negotiations with Interested Parties.

      For purposes of this Agreement, "Interested Parties" shall include (i) any
      party identified in writing by RBC to the Company and approached by RBC
      with respect to a possible Transaction and (ii) any party identified in
      writing to RBC by the Company for the purpose of having such party
      approached by RBC in connection with a possible Transaction; provided,
      however, that nothing herein shall require the Company to identify any
      prospective Interested Party to RBC.

4.    Certain Agreements of the Company. The Company represents and warrants or
      agrees, as applicable, that:

      (a)   it shall make available to RBC all information concerning the
            business, assets, operations and financial condition of the Company
            which RBC reasonably requests in connection with the performance of
            its services hereunder and notify RBC of any material adverse
            change, or development that may lead to a material adverse change,
            in the business, properties, operations or financial condition of
            the Company. The Company shall also provide RBC monthly financial
            updates on the Company during the Term and shall inform RBC
            immediately of any material events or developments concerning
            prospective material events that may come to the attention of the
            Company at any point during the Term. None of the information
            provided to RBC shall contain an untrue statement of a material fact
            or omit to state a material fact necessary to make the statements
            therein, in light of the circumstances under which they were made,
            not misleading. RBC will be



Immunomedics, Inc.
July 28, 2004
Page 3


            relying, without independent verification, on the accuracy and
            completeness of all financial and other information that is and will
            be furnished to it by the Company and the Company acknowledges and
            agrees that with respect to any financial forecasts and projections
            made available to RBC, RBC is entitled to assume that such forecasts
            and projections have been reasonably prepared and reflect the best
            currently available estimates and judgments of the Company
            management;

      (b)   it shall have the sole responsibility for the accuracy and
            completeness of the prospectus supplement, the related base
            prospectus and any documents incorporated by reference therein
            (together, the "Prospectus"), and the Prospectus will (i) include
            all information required to be provided to investors under
            applicable securities laws and regulations and (ii) not contain an
            untrue statement of a material fact or omit to state a material fact
            necessary to make the statements therein, in light of the
            circumstances under which they were made, not misleading;

      (c)   it understands that this Agreement and the services set forth above
            in the section captioned Services to be Provided by RBC in no way
            constitute a guarantee that a Transaction will be successful.
            Management acknowledges that the Company is ultimately responsible
            for the successful completion of a Transaction;

      (d)   the Securities will be offered only by approaching prospective
            purchasers on an individual basis. No general solicitation or
            general advertising in any form will be used in connection with the
            offering of the Securities. From and after the execution of this
            Agreement until the completion of the Registered Placement, the
            Company shall pre-clear any proposed press release which mentions
            this Agreement or the Registered Placement with RBC;

      (e)   neither the Company, nor any of its directors, officers or
            shareholders, should in any way rely on RBC to perform any due
            diligence with respect to the Company. It is expressly understood
            and agreed that to the extent due diligence is conducted, it will be
            conducted by the Registered Placement investors;

      (f)   promptly following execution of this Agreement, the Company shall
            prepare and, following review and approval by RBC's counsel, file
            with the SEC a preliminary and/or final prospectus supplement. From
            time to time in connection with any particular sale of Securities,
            the Company will, at its own expense, obtain any registration or
            qualification required to sell any Securities under the Blue Sky
            laws of any applicable jurisdictions, as reasonably requested by
            RBC, and shall pay any filing fees required by NASD Regulation, Inc.
            in connection with their review of the terms of this Agreement, if
            so required;

      (g)   (i) it has full right, power and authority to enter into this
            Agreement and to perform all of its obligations hereunder; (ii) this
            Agreement has been duly authorized and executed by and constitutes a
            valid and binding agreement of the Company



Immunomedics, Inc.
July 28, 2004
Page 4


            enforceable in accordance with its terms; and (iii) the execution
            and delivery of this Agreement and the consummation of the
            transactions contemplated hereby do not conflict with or result in a
            breach of (X) the Company's certificate of incorporation or by-laws
            or (Y) any agreement to which the Company is a party or by which any
            of its property or assets is bound;

      (h)   it is eligible to use a shelf registration on Form S-3 under the
            Securities Act ("Registration Statement") for this Registered
            Placement. As of the date hereof, the Registration Statement is
            effective, and the Company shall ensure that the Registration
            Statement remains effective during the Term; the Company will notify
            RBC immediately if it determines it is either (i) no longer eligible
            to use the Registration Statement or (ii) the Registration Statement
            is otherwise no longer effective;

      (i)   the closing of the sale of the Securities shall be subject to
            customary closing conditions, including the provision by the Company
            to RBC of officers' certificates, opinions of counsel and "cold
            comfort" letters from the Company's auditors; and

      (j)   it shall be responsible to make all necessary notifications of and
            filings with all federal and state securities regulatory
            authorities.

5.    Placement Agency Fee. If (i) a Transaction is consummated during the Term,
      or (ii) during the Term, a definitive agreement or letter of intent or
      other evidence of commitment is entered into by the Company with an
      Interested Party which subsequently results in a sale of Securities that
      is consummated during the Term or within the six-month period following
      the Term (an "Other Transaction"), then, in either case, the Company
      hereby agrees to pay RBC a cash fee (the "Registered Placement Fee") in
      the amount of 6.0% of the gross proceeds raised from any Transaction or
      Other Transaction, as applicable. The Registered Placement Fee shall be
      paid in its entirety to RBC at the closing of the Transaction or Other
      Transaction, as applicable.

      It is anticipated that the Company may offer Interested Parties who
      purchase Securities in the Registered Placement the opportunity to
      purchase additional Securities following the Registered Placement
      ("Additional Purchases"; such purchasers, the "Additional Purchasers").
      The Company hereby agrees to pay RBC a cash fee in the amount of 6.0% of
      the gross proceeds raised from any Additional Purchasers in connection
      with any such Additional Purchases during the Term or within the six-month
      period following the Term. Any such fee shall be paid in its entirety at
      the closing related to any such Additional Purchase.

6.    Expenses. In addition to any fees that may be payable hereunder and
      regardless of whether any proposed transaction is consummated, the Company
      hereby agrees to reimburse RBC for all reasonable travel, legal and other
      out-of-pocket expenses incurred in performing the services described
      herein (including reasonable fees and disbursements



Immunomedics, Inc.
July 28, 2004
Page 5


      of RBC's legal counsel). Aggregate expenses (including legal fees and
      disbursements) in excess of $35,000 shall require prior written approval
      by the Company, which approval shall not be unreasonably withheld.

7.    Additional Services. To the extent that the Company requires any of the
      following additional services (whether or not such additional services are
      related to a Registered Placement) from the date hereof until a period of
      180 days following the completion of a Registered Placement ("Additional
      Services"), the Company will consider using RBC and/or a member of the RBC
      Financial Group to provide such Additional Services:

      (a)   Sole bookrunning and lead manager, or lead initial purchaser, or
            lead placement agent, as the case may be, for any equity or debt
            financing; or

      (b)   Lead agent, arranger or underwriter for any bank financing,
            including but not limited to any bridge loan(s) or other short-term
            financing; or

      (c)   Sole financial advisor for any M&A advisory and/or transaction.

      To the extent RBC is engaged by the Company to provide any Additional
      Services, the terms and conditions relating to such services will be
      outlined in a separate proposal and the fees for such services will be in
      addition to fees payable hereunder. Any such proposal will be negotiated
      separately and in good faith, set forth in a separate written agreement,
      and be consistent with then prevailing industry practice.

      The agreement set forth in this Section 7 is neither an expressed nor
      implied commitment by RBC to provide any additional services (including
      but not limited to any bank financing).

8.    Termination. This Agreement may be terminated with or without cause on
      either the Company's or RBC's written request with 30 days notice,
      provided that such termination shall not affect the exculpation,
      indemnification and contribution obligations of the Company or RBC or the
      right of RBC to receive any fees payable hereunder, any fees which have
      accrued prior to such termination, or the right of RBC to receive
      reimbursement for its out-of-pocket expenses described above. It is
      expressly understood that neither RBC nor the Company shall have any
      continuing obligation or liability to one another under this Agreement
      upon termination hereof, except in respect of the matters specifically
      referenced in this section.

9.    Disclosure. The Company agrees that, except as required by applicable law,
      any advice to be provided by RBC under this Agreement shall not be
      disclosed publicly or made available to third parties without the prior
      approval of RBC, which approval shall not be unreasonably withheld.

10.   Co-agents. RBC reserves the right to use co-agents to assist with respect
      to any Registered Placement, provided that any such co-agent shall have
      prior written approval



Immunomedics, Inc.
July 28, 2004
Page 6


      by the Company, which approval shall not be unreasonably withheld.

11.   Publicity. The Company and RBC acknowledge and agree that RBC may,
      subsequent to the closing of any Transaction, make public its involvement
      with the Transaction.

12.   Complete Agreement and Acknowledgement by Company. This Agreement
      incorporates the entire understanding of the parties with respect to the
      subject matter of this Agreement. The Company acknowledges and agrees that
      this Agreement and the services to be provided by RBC, as described above,
      in no way constitute a guarantee that any Transaction will be successful.

13.   Amendments; Governing Law; Miscellaneous. This Agreement may not be
      amended or modified except in writing and shall be governed by and
      construed in accordance with the laws of the State of New York without
      regard to the conflicts of laws provisions thereof. The invalidity or
      unenforceability of any provision of this Agreement shall not affect the
      validity or enforceability of any other provision of this Agreement which
      shall remain in full force and effect. The Company is a sophisticated
      business enterprise that has retained RBC for the limited purpose set
      forth in this Agreement, and the parties acknowledge and agree that their
      respective rights and obligations are contractual in nature. Each party
      disclaims an intention to impose fiduciary or other non-contractual
      obligations on the other by virtue of the engagement contemplated by this
      Agreement. Each of the Company and RBC (each on its own behalf and, to the
      extent permitted by applicable law, on behalf of its shareholders) hereby
      irrevocably waives any right that it may have to a trial by jury in
      respect of any claim, counter-claim or action based on or arising out of
      this Agreement, RBC's or the Company's performance under this Agreement or
      the transactions contemplated hereby. This Agreement may be executed in
      counterparts and facsimile signatures will be acceptable with original
      signed copies of this Agreement to follow to all parties.

14.   Indemnification. Recognizing that transactions of the type contemplated in
      this Agreement sometimes result in litigation and that RBC's role is
      advisory, the Company agrees to indemnify and hold harmless each of RBC,
      its partners, employees, agents, affiliates and persons deemed to be in
      control of RBC within the meaning of either Section 15 of the Securities
      Act or Section 20 of the Securities Exchange Act of 1934, as amended (the
      "Exchange Act") (collectively, the "Indemnified Parties"), from and
      against any claims, damages, expenses (including reasonable attorneys'
      fees and legal costs) and liabilities, joint or several, related to or
      arising in any manner out of any transaction, proposal or any other matter
      (the "Matters") contemplated by the engagement of RBC hereunder. The
      Company also agrees that neither RBC nor any other Indemnified Party shall
      have any liability to the Company or its affiliates, partners, directors,
      agents, employees, controlling persons or securityholders for any losses,
      claims or expenses related to or arising out of any Matters, except as
      provided in this section. The Company will promptly reimburse any
      Indemnified Party for all expenses as reasonably incurred in connection
      with the investigation of, preparation for or defense of any pending or
      threatened claim related to or arising in any manner out of any Matter
      contemplated by



Immunomedics, Inc.
July 28, 2004
Page 7


      the engagement of RBC hereunder, or any action or proceeding arising
      therefrom.

      The Company may assume the defense of any litigation or proceeding in
      respect of which indemnity may be sought hereunder, including the
      employment of counsel and experts reasonably satisfactory to RBC and the
      payment of the fees and expenses of such counsel and experts, in which
      event, except as provided below, the Company shall not be liable for the
      fees and expenses of any other counsel or expert retained by any
      Indemnified Party in connection with such litigation or proceeding. In any
      such litigation or proceeding the defense of which the Company shall have
      so assumed, any Indemnified Party shall have the right to participate in
      such litigation or proceeding and to retain its own counsel and experts,
      but the fees and expenses of such counsel and experts shall be at the
      expense of such Indemnified Party unless (i) the Company and such
      Indemnified Party shall have mutually agreed in writing to the retention
      of such counsel or experts, (ii) the Company shall have failed in a timely
      manner to assume the defense and employ counsel or experts reasonably
      satisfactory to RBC in such litigation or proceeding, or (iii) the named
      parties to any such litigation or proceeding (including any impleaded
      parties) include the Company and such Indemnified Party and representation
      of the Company and any Indemnified Party by the same counsel or experts
      would, in the reasonable opinion of RBC, be inappropriate due to actual or
      potential differing interests between the Company and any such Indemnified
      Party.

      The Company shall not, without the prior written consent of RBC, settle
      any litigation relating to this Agreement or any Matter unless such
      settlement includes an express, complete and unconditional release of RBC
      and its affiliates (and their respective control persons, partners,
      directors, officers, employees, consultants and agents) with respect to
      all claims asserted in such litigation or relating to this Agreement or
      any Matter; such release to be set forth in an instrument signed by all
      parties to such settlement. Neither the Company nor an Indemnified Party
      shall be liable for any settlement of any litigation or proceeding
      effected without its written consent, unless such settlement, compromise
      or consent includes an unconditional release of the Company or each
      Indemnified Party, as the case may be, from all liability arising out of
      such claim, action, suit or proceeding.

      Notwithstanding any provision herein to the contrary, the Company shall
      not be liable hereunder for indemnification to an Indemnified Party, and
      the Indemnified Party shall not be exculpated, indemnified or reimbursed,
      in respect of any claims, damages, losses, liabilities or expenses that
      are finally judicially determined to have resulted primarily and directly
      from the gross negligence or willful misconduct of such Indemnified Party.
      Subject to the foregoing sentence, in no event, regardless of the legal
      theory advanced, shall any Indemnified Party be liable for any
      consequential, indirect, incidental or special damages of any nature.

      The Company agrees that the exculpation, indemnification and reimbursement
      commitments set forth in this Agreement shall apply whether or not such
      Indemnified Party is a formal party to any such claim, action or
      proceeding.



Immunomedics, Inc.
July 28, 2004
Page 8


      The Company agrees that if any exculpation, indemnification or
      reimbursement sought pursuant to this letter were for any reason not to be
      available to any Indemnified Party or insufficient to hold any Indemnified
      Party harmless as and to the extent contemplated hereby, then the Company
      shall contribute to the amount paid or payable by the Indemnified Party as
      a result of the claims, damages, losses, expenses and liabilities in such
      proportion as is appropriate (i) to reflect the relative benefits to the
      Company and its securityholders on the one hand, and RBC on the other
      hand, in connection with the transaction to which such exculpation,
      indemnification or reimbursement relates or (ii) if the allocation on that
      basis is not permitted by applicable law, to reflect not only the relative
      benefits referred to in clause (i) above but also the relative fault of
      each such Indemnified Party, respectively, and the Company as well as any
      other relevant equitable considerations. The Company and RBC agree that it
      would not be just and equitable if the contribution provided for herein
      were determined by pro rata allocation or any other method which does not
      take into account the equitable considerations referred to above. It is
      hereby agreed that the relative benefits to the Company, on the one hand,
      and RBC, on the other hand, with respect to this engagement shall be
      deemed to be in the same proportion as (i) the gross proceeds received (or
      to be received) by the Company and/or its securityholders in connection
      with any Transaction (whether or not consummated) for which RBC is engaged
      to render financial advisory services bears to (ii) the fee paid to RBC in
      connection with this engagement. In no event shall RBC contribute in
      excess of the fees actually received by RBC pursuant to the terms of this
      engagement.

      The exculpation, indemnity, reimbursement and contribution obligations of
      the Company shall survive the termination of this engagement, shall be in
      addition to any liability which the Company may otherwise have and shall
      be binding upon and inure to the benefit of any successors and assigns of
      the Company and any successors, assigns, heirs and personal
      representatives of an Indemnified Party.

      The exculpation, indemnity, reimbursement and contribution provided herein
      shall remain operative and in full force and effect regardless of any
      investigation made by or on behalf of any party hereto or any person
      controlling (within the meaning of Section 15 of the Securities Act or
      Section 20 of the Exchange Act) any party hereto.

14.   Notices. All notices and other communications required hereunder shall be
      in writing and shall be deemed effectively given upon personal delivery;
      upon confirmed transmission by telecopy or telex; or upon deposit with the
      United States Post Office, by first-class mail, postage prepaid, or
      otherwise delivered by hand or by messenger or courier, addressed (i) if
      to the Company, at the Company's address as set forth above or at such
      other address as the Company shall have furnished in writing to RBC,
      Attention: Chief Financial Officer, or (ii) if to RBC, to RBC Capital
      Markets, Two Embarcadero Center, Suite 1200, San Francisco, CA 94111,
      Attention: Michael J. Rosso, Director and Head of Equity Private
      Placements, or at such other address as RBC shall have furnished in
      writing to the Company.



Immunomedics, Inc.
July 28, 2004
Page 9


Please confirm that the foregoing is in accordance with our understandings and
agreements by signing and returning to RBC duplicates of this letter enclosed
herewith.

Very truly yours,

RBC CAPITAL MARKETS

By:   RBC Capital Markets Corporation

By:   /s/ Michael J. Rosso
- ------------------------------------------
      Michael J. Rosso
      Head of Equity Private Placements


Accepted and Agreed to:

By:   Immunomedics, Inc.

By:   /s/ Cynthia L. Sullivan
- ------------------------------------------
      Cynthia L. Sullivan
      President and Chief Executive Officer