EXHIBIT 3.12

    CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR PORTIONS OF THIS DOCUMENT.
                   CONFIDENTIAL PROVISIONS HAVE BEEN OBSCURED.

                               BIOVATION LIMITED

                           EXCLUSIVE LICENSE AGREEMENT


This Exclusive License Agreement (this "Agreement") is made as of the 8th day of
March, 2004 (the "Effective Date") between BIOVATION LIMITED OF CROMBIE LODGE,
ABERDEEN SCIENCE PARK, BALGOWNIE DRIVE, ABERDEEN AB22 8GU, UK (hereinafter
called "Biovation," which expression includes its successors and assigns) of the
one part and VIVENTIA BIOTECH, INC., OF 10 FOUR SEASONS PLACE, SUITE 501,
TORONTO, ONTARIO, CANADA M9B 6H7 (hereinafter called "Viventia," which
expression includes its successors and permitted assignees) of the other part.
Each of Biovation and Viventia are herein sometimes referred to individually as
a "Party" and collectively as "Parties."

         WHEREAS, Biovation Controls certain proprietary Technology related to
the genetic engineering of biological materials, including proteins and the
removal of immunogenic sequences from proteins to produce genetic variants of
such proteins for therapeutic or in vivo diagnostic purposes.

         WHEREAS, Biovation and Viventia have entered into that certain Research
Agreement (the "Research Agreement") dated as of September 20, 2002.

         WHEREAS, Viventia has exercised its option to obtain an exclusive
license to certain proprietary Technology under Section 3.7 of the Research
Agreement.

         NOW, THEREFORE, IT IS HEREBY AGREED as follows:

1.       DEFINITIONS.

         Throughout this Agreement, where the context so requires, the use of
         the singular form of a word shall be construed to include the plural
         and the use of the plural shall be construed to include the singular,
         and the use of any gender shall include all genders. Any words used but
         not otherwise defined herein shall have the meanings ascribed to them
         in Section 1 of the Research Agreement. In this Agreement the following
         words and expressions shall be construed as follows:


         (a)      "Affiliate" shall mean any corporation, company, firm,
                  partnership or other entity that directly or indirectly
                  controls, is controlled by or is under common control with
                  either Party to this Agreement. For purposes of this
                  definition, "control" shall mean the ownership, directly or
                  indirectly, of fifty percent (50%) or more of the issued share
                  capital or shares of stock entitled to vote for the election
                  of directors, in the case of a corporation, or fifty percent
                  (50%) or more of the equity interests in the case of any other
                  entity or the legal power to direct or cause the direction of
                  the general management and policies of the entity in question.

         (b)      "Biovation Technology" shall mean Technology Controlled by
                  Biovation as of the Effective Date or developed hereafter
                  whether or





                  not in the course of the Research Program, by Biovation or
                  jointly by Biovation and Viventia or a third party that is
                  related to the genetic engineering of biological materials,
                  including proteins and plasmids and the removal of immunogenic
                  sequences from proteins or plasmids and the generation of
                  genetic variants thereof, provided that, any Technology
                  Controlled by Viventia or developed by Viventia that is
                  related to the Protein shall be deemed to be Viventia
                  Technology and Viventia shall have exclusive ownership and
                  control of same.

         (c)      "BLA" shall mean a Biologics License Application, or similar
                  application for marketing approval of a Licensed Product for
                  use in the Field submitted to the FDA, or a foreign equivalent
                  of the FDA.

         (d)      "Confidential Information" shall have the meaning set forth in
                  Section 15 of this Agreement.

         (e)      "Contract Year" shall mean the period beginning on the
                  Effective Date and ending on the first anniversary thereof
                  ("Contract Year 1"), and each succeeding twelve (12) month
                  period thereafter during the term of this Agreement (referred
                  to herein as "Contract Year 2," "Contract Year 3," etc.).

         (f)      "Control" or "Controlled" shall mean (i) with respect to any
                  Technology (other than proprietary materials of a Party)
                  and/or Patent Rights, the possession by a Party of the ability
                  to grant a license or sublicense of such Technology and/or
                  Patent Rights as provided herein without violating the terms
                  of any agreement or arrangement between such Party and any
                  third party and (ii) with respect to proprietary materials,
                  the possession by a Party of the ability to supply such
                  proprietary materials to the other Party as provided herein
                  without violating the terms of any agreement or arrangement
                  between such Party and any third party.

         (g)      "DeImmunised Proteins" shall mean the DeImmunised genetic
                  variants of the Protein developed by Biovation under the
                  Research Agreement identified on Schedule A, attached hereto
                  and incorporated herein by reference.

         (h)      "DeImmunised Plasmids" shall mean the genetically engineered
                  plasmids that encode the DeImmunised Protein identified on
                  Schedule A, attached hereto and incorporated herein by
                  reference.

         (i)      "Effective Date" shall have the meaning set forth above in the
                  introduction to this Agreement.

         (j)      "FDA" means the United States Food and Drug Administration or
                  its successor.

         (k)      "Field" shall mean the use of the DeImmunised Protein for
                  therapeutic and in vivo diagnostic purposes in humans.



                                       2



         (l)      "First Commercial Sale" shall mean the date of the first
                  commercial sale (other than for purposes of obtaining
                  Regulatory Approval) of a Licensed Product by or on behalf of
                  Viventia or any sublicensee.

         (m)      "IND" shall mean Investigational New Drug application filing
                  in the USA or its equivalent in any country in the European
                  Union for approval to undertake a controlled and lawful study
                  in humans of the Licensed Product that is designed to
                  demonstrate statistically whether such Licensed Product is
                  safe for use in humans in a manner sufficient to file a BLA or
                  New Drug Application or its equivalent to obtain regulatory
                  approval to market and sell that Licensed Product in the
                  United States or any country in the European Union.

         (n)      "Joint Patent Rights" shall mean all Patent Rights that claim
                  Joint Program Technology. Joint Patent Rights as of the
                  Effective Date are listed in Schedule B, attached hereto and
                  incorporated herein by reference.

         (o)      "Joint Program Technology" shall mean any and all Technology
                  relating to the Protein or any DeImmunised Plasmid or
                  DeImmunised Protein jointly made, developed conceived and/or
                  reduced to practice (a) by employees of, or consultants to,
                  both Parties, or (b) by Viventia through the material use of
                  Biovation Technology, provided that Joint Program Technology
                  shall not include Technology relating to (i) the Protein (ii)
                  the composition, manufacture, or use of antibodies, antibody
                  fragments (including single chain or single domain
                  antibodies), or peptide-based antibody mimics, whether by
                  themselves or conjugated to or associated with an active
                  molecule, or (iii) fusion proteins..

         (p)      "Licensed Patent Rights" shall mean all Patent Rights which
                  are Controlled by Biovation as of the Effective Date
                  (including Biovation's interest in Joint Patent Rights).
                  Licensed Patent Rights as of the Effective Date are listed in
                  Schedule C, attached hereto and incorporated herein by
                  reference.

         (q)      "Licensed Product" shall mean any product that (i)
                  incorporates DeImmunised Protein, (ii) is produced by use of a
                  DeImmunised Plasmid, or (iii) the manufacture, use, or sale of
                  which would, absent the license granted to Viventia hereunder,
                  infringe one or more of the claims included in the Licensed
                  Patent Rights that has not expired, been revoked or
                  disclaimed, or found to be invalid or unenforceable in an
                  unappealed or unappealable decision of a court of competent
                  jurisdiction.

         (r)      "Licensed Technology" shall mean all Biovation Technology and
                  Biovation's interest in Joint Program Technology.

         (s)      "New Drug Application" shall mean a new drug application (as
                  defined in Title 21 of the United States Code of Federal
                  Regulations, as amended from time to time) filed with the FDA
                  or its foreign


                                       3



                  equivalent seeking regulatory approval to market and sell any
                  Licensed Product in the United States or any country in the
                  European Union.

         (t)      "Net Sales" shall mean gross proceeds measured in Dollars as
                  of the date of sale resulting from the invoice price less (a)
                  usual trade and/or cash discounts actually allowed or taken;
                  (b) forwarding expenses, freight, postage and duties actually
                  paid or allowed and taxes imposed directly on licensee for
                  sales, all if separately identified in the invoice; and (c)
                  credits for goods actually returned. No deductions shall be
                  made for commissions paid or for the cost of collections. For
                  Licensed Products sold or otherwise transferred other than for
                  money, "Net Sales" shall be calculated based upon the "fair
                  market value" of the Licensed Product determined in an
                  arm's-length transaction. Net Sales shall be calculated on the
                  price from Viventia, a licensee, a sublicensee, or their
                  Affiliates to the first purchaser who is not a licensee, a
                  sublicensee or Affiliate and not on sales between or among
                  licensees, sublicensees, or their Affiliates.

         (u)      "Patent Rights" shall mean the rights and interests in and to
                  (i) issued patents and pending patent applications without
                  limitation to any country, including, without limitation, all
                  provisional applications, substitutions, continuations,
                  continuations-in-part, divisionals and renewals, all letters
                  patent granted thereon, if any, and all reissues,
                  reexaminations and extensions thereof, and supplemental
                  protection certificates of invention and utility models and
                  (ii) copyrights with respect to data Controlled by a Party.

         (v)      "Phase III Clinical Trial" shall mean, as to a particular
                  Licensed Product for a particular indication, a controlled and
                  lawful study in humans of the safety and efficacy of such
                  Licensed Product for such indication, which is prospectively
                  designed to demonstrate statistically whether such Licensed
                  Product is safe and effective for use in such indication in a
                  manner sufficient to file a BLA or New Drug Application or its
                  equivalent to obtain regulatory approval to market and sell
                  that Licensed Product in the United States or any country for
                  the indication under investigation in such study.

         (w)      "Protein" shall mean the starting protein as specified in
                  Schedule A hereto.

         (x)      "Technology" shall mean and include all inventions,
                  discoveries, improvements, trade secrets and proprietary
                  methods and materials, whether or not patentable, including,
                  but not limited to (i) samples of, methods of production or
                  use of, and structural and functional information pertaining
                  to, chemical compounds, proteins or other biological
                  substances and (ii) technical and scientific information
                  (including any negative results), data, formulations,
                  techniques and know-how.

         (y)      For clarity, is is agreed that "Deliverables" (as defined in
                  the Research Agreement and incorporated in this Agreement)
                  include deimmunised


                                       4



                  [                                        ] and the expression
                  products of the inserts of such plasmids.

2.       COMMENCEMENT.

         This Agreement shall be deemed to have been made as of the Effective
         Date and shall be read and construed accordingly.

3.       GRANT OF RIGHTS.

         (a)      Biovation hereby grants to Viventia an exclusive world-wide,
                  royalty-bearing license under Licensed Technology and Licensed
                  Patent Rights solely to develop, have developed, make, have
                  made, use, sell, distribute for sale, have sold, import and/or
                  have imported Licensed Products in the Field, together with
                  the right to grant sublicenses. For clarity, this grant of an
                  exclusive license to Viventia with respect to Licensed
                  Products (including Deliverables, Deimmunised Plasmids and
                  Deimmunised Proteins) shall not prevent Biovation from
                  granting licenses to others under the Biovation Technology,
                  Biovation Patent Rights and Biovation's interest in Joint
                  Program Technology and Joint Patent Rights outside the scope
                  of the exclusive license granted to Viventia.

         (b)      Viventia shall notify Biovation of the grant of each
                  sublicense within thirty (30) days of its effective date, such
                  notification to include the name and address of the
                  sublicensee and the general nature and subject matter of the
                  sublicense. Viventia shall use its best efforts to ensure that
                  any sublicensee performs its obligations under any such
                  sublicense and shall remain liable for the performance of
                  Viventia's obligations hereunder. Biovation will not establish
                  any contact with the sublicensee in relation to the sublicense
                  without the prior written consent of Viventia.

4.       PAYMENTS.

4.1      General. The Parties acknowledge that the principal value contributed
         by Biovation under this Agreement is the Licensed Technology. Viventia
         acknowledges and agrees that the value it receives hereunder is in its
         access to the Licensed Technology. Accordingly, Viventia has agreed to
         pay the license fees and milestones for access to and use of Licensed
         Technology as set forth herein even though Biovation may not Control
         patent applications or patents covering the manufacture, sale, use or
         importation of a particular Licensed Product and, regardless of whether
         a Licensed Product is covered by a patent application or patent within
         the Licensed Patents.

4.2      Upfront Payment. In consideration for the exclusive license granted
         pursuant to Section 3(a) hereof Viventia shall pay to Biovation the sum
         of [                                                ] upon signature of
         this Agreement.

4.3      Milestone Payments. Viventia shall pay Biovation the following amounts
         upon the achievement of the milestones set forth below:



                                       5



         (a)      [
                             ] upon the commencement of [
                                          ] of each and every Licensed Product
                  for a distinct indication. By way of example, the start of two
                  such trials would incur two milestones if the same product was
                  being tested for two indications or if two different products
                  were being tested for the same indication, but would incur
                  only one milestone if each was of the same product for the
                  same indication. Each such milestone payment shall be reduced
                  to a minimum of [
                                 ] according to the following formula if the
                  event triggering such milestone also triggers a milestone
                  payment by Viventia to a third party:

                  Milestone Rate in U.S. dollars = [



                                                             ]

         (b)      [
                             ] upon [
                                          ] the commencement of which triggered
                  a milestone under subsection (a) above. Each such milestone
                  payment shall be reduced to a minimum of [
                                                             ] according to the
                  following formula if the event triggering such milestone also
                  triggers a milestone payment by Viventia to a third party:

                  Milestone Rate in U.S. dollars = [



                                                             ]

         (c)      [
                             ] upon submission of [
                             ] for each and every Licensed Product for each and
                  every clinical indication. Each such milestone payment shall
                  be reduced to a minimum of [
                                                         ] according to the
                  following formula if the event triggering such milestone also
                  triggers a milestone payment by Viventia to a third party:

                  Milestone Rate in U.S. dollars = [


                                                             ]


         (d)      [
                             ] upon approval of [        ] the submission of
                  which triggered a milestone payment under subsection (c)
                  above. Each such milestone payment shall be reduced to a
                  minimum of [
                                           ] according to the following formula
                  if the


                                       6


                  event triggering such milestone also triggers a milestone
                  payment by Viventia to a third party:

                  Milestone Rate in U.S. dollars = [



                                                                       ]

4.4      Fees.

         (a)      Viventia shall pay Biovation a sublicense fee of [
                                                             ] for each and
                  every sublicense that it grants hereunder.

         (b)      Viventia shall also pay to Biovation an annual license fee of
                  [                                                ] for the
                  maintenance of the license granted pursuant to Section 3 of
                  this Agreement for each Contract Year during the term of this
                  Agreement. Such annual license fees shall be due and payable
                  to Biovation on the first day of each Contract Year during the
                  term of this Agreement and are not creditable against amounts
                  owed by Viventia to Biovation pursuant to Sections 4.3 and
                  4.5. In the event that Licensee does not receive approval for
                  an IND by the end of Contract Year 5, then the Licensee shall
                  make an additional annual payment of [
                              ] in addition to the annual license fee payable
                  for the relevant Contract Year (each, an "Additional Annual
                  Payment"). Such Additional Annual Payments shall be due and
                  payable on the first day of Contract Year 6 and each
                  subsequent Contract Year until an IND is approved at which
                  time such Additional Annual Payments will cease. All
                  Additional Annual Payments to be paid under this Section
                  4.4(b) shall be creditable against amounts required to be paid
                  by Viventia to Biovation under Section 4.3 of this Agreement
                  subsequent to the payment of such Additional Annual Payment.

         (c)      All of the payments set forth in sections 4.2, 4.3 and 4.4 are
                  to be understood net, exclusive of Value Added Tax.

4.5      Royalties.

         Viventia shall pay Biovation a [ ]% royalty based on aggregate Net
         Sales of each Licensed Product sold during the License Term (as defined
         in Section 5 below) by Viventia and/or its Affiliates and sublicensees.

         The [ ]% royalty rate to be paid to Biovation shall be subject to a
         reduction if Viventia's total undiscounted royalty to Biovation and
         third parties on aggregate Net Sales of each Licensed Product would
         otherwise exceed [  ]%. In such an event, the royalty payable to
         Biovation will be discounted based on the following formula: [






                                       7



                                                                        ]

4.6      Accounting.

         (a)      All payments under this Agreement shall be due in the case of
                  Section 4.3 within thirty (30) days of the occurrence of the
                  relevant milestone event and, in the case of Section 4.4(a)
                  within thirty (30) days of the execution of the sublicense, in
                  each case without the requirement for an invoice from
                  Biovation. Viventia will promptly notify Biovation of the
                  achievement of any milestone event for which a payment to
                  Biovation is required under this Section 4. After the
                  beginning of commercialization of each Licensed Product, all
                  payments relating thereto under this Agreement pursuant to
                  Section 4.5 above shall be due within thirty (30) days
                  following the end of each calendar quarter.

         (b)      The Net Sales used for computing the royalties payable
                  hereunder shall be computed and the royalties shall be paid,
                  in U.S. Dollars. For purposes of determining the amount of
                  royalties due from Viventia, the amount of Net Sales in any
                  foreign currency shall be computed by converting such amount
                  into dollars at the prevailing commercial rate of exchange for
                  purchasing dollars with such foreign currency as reported in
                  The Wall Street Journal as of the last business day of the
                  relevant quarter.

         (c)      Viventia agrees to keep true and accurate records and books of
                  account containing all data necessary for the calculation of
                  the royalties payable to Biovation under Section 4 of this
                  Agreement. Such records and books of account shall upon
                  reasonable notice having been given by Biovation be open
                  during business hours for inspection by a duly authorised, but
                  neutral and independent accountant, who shall be acceptable to
                  both parties without prejudice. Biovation will bear the full
                  cost of such audit unless such audit discloses an underpayment
                  of more than five percent (5%) from the amount of total
                  payments due. In such case, Viventia shall bear the full cost
                  of such audit. The terms of this Section 4.6(c) shall survive
                  any termination or expiration of this Agreement for a period
                  of three (3) years.

         (d)      Viventia shall prepare a statement in respect of each calendar
                  quarter of this Agreement which shall show for the calendar
                  quarter in question Viventia's Net Sales on sales by it, its
                  Affiliates or sublicensees of the Licensed Products on a
                  country by country basis, details of the quantities of
                  Licensed Products manufactured and sold in each country and
                  the royalty and VAT due, if any, to Biovation thereon pursuant
                  to Section 4 above. Such statement shall be submitted to
                  Biovation within thirty (30) days following the end of the
                  calendar quarter or part thereof to which it relates together
                  with a remittance for the royalties and VAT due to Biovation,
                  if any. If Biovation shall give notice to Viventia within
                  thirty (30) days of the receipt of any such statement that it
                  does not accept the same such statement shall be


                                       8


                  certified by an independent chartered accountant appointed by
                  mutual agreement between the parties hereto or, in default of
                  such an agreement, within fourteen (14) days, by the President
                  for the time being of the Institute of Chartered Accountants
                  of England and Wales in London. Viventia shall make available
                  all books and records required for the purpose of such
                  certification at reasonable times during normal business hours
                  and the statement so certified shall be binding between the
                  parties to this Agreement. The costs of such certification
                  shall be the responsibility of Biovation if the certification
                  shows the original statement to have been accurate and
                  otherwise shall be the responsibility of Viventia. Following
                  any such certification the Parties shall make any adjustments
                  necessary in respect of the royalties already paid to
                  Biovation in relation to the year in question.

         (e)      Viventia shall pay royalties to Biovation free and clear of
                  and without deduction or deferment in respect of any demand,
                  set-off, counterclaim or other dispute and so far as is
                  legally possible such payment shall be made free and clear of
                  any taxes imposed by or under the authority of any government
                  or public authority and in particular but without limitation
                  where any sums due to be paid to Biovation hereunder are
                  subject to any withholding or similar tax. Viventia shall pay
                  such additional amount as shall be required to ensure that the
                  net amount received by Biovation hereunder will equal the full
                  amount which would have been received by it had not such tax,
                  including VAT, been imposed or withheld. Viventia and
                  Biovation, without prejudice to the foregoing, shall use their
                  best endeavours to do all such lawful acts and things and to
                  sign all such lawful deeds and documents as will enable
                  Viventia to take advantage of any applicable legal provision
                  or any double taxation treaties with the object of paying the
                  sums due to Biovation without imposing or withholding any tax.
                  Sums are expressed in this Agreement as exclusive of value
                  added tax. Biovation agrees to provide Viventia with a VAT
                  invoice in respect of every payment affected by VAT.

         (f)      Where Biovation does not receive payment of any sums due to it
                  within the period specified hereunder in respect thereof,
                  interest shall accrue on the sum outstanding at the rate of
                  one percent (1%) per month calculated on a daily basis without
                  prejudice to Biovation's right to receive payment on the due
                  date therefor.

5.       LICENSE TERM AND TERMINATION.

         (a)      Subject to the terms and conditions of this Agreement, the
                  term of the license (the "License Term") granted pursuant
                  hereto shall commence upon the Effective Date and continue in
                  force on a country-by-country and product-by-product basis
                  until the longer of (a) the expiration of the last to expire
                  of the Licensed Patent Rights in the country covering the
                  Licensed Product and (b) ten (10) years from the first
                  commercial sale in such country of such Licensed Product. Upon
                  expiration of the Licence Term for each Licensed Product,
                  Viventia shall have a worldwide, exclusive fully paid up,
                  royalty-free licence under any and


                                       9


                  all Licensed Technology and/or Licensed Patent Rights covering
                  the Licensed Product to the extent necessary or useful to
                  develop, have developed, make, have made, use, sell,
                  distribute for sale, have sold, import and/or have imported
                  Licensed Products in the Field.

         (b)      Viventia may terminate this Agreement and the licenses granted
                  pursuant hereto by giving to Biovation six (6) months prior
                  written notice to Biovation of the same. Such termination
                  shall not prejudice Biovation in its enforcement of the
                  Licensed Patents in the event of subsequent manufacture of
                  Licensed Products by Viventia.

         (c)      Termination of this Agreement or of such licenses shall be
                  without prejudice to any rights of either Party against the
                  other which may have accrued up to the date of such
                  termination and Viventia shall pay to Biovation the
                  appropriate royalties hereunder on all inventory of Licensed
                  Products (on which royalties have not already been paid) held
                  at the date of termination by Viventia or any person engaged
                  by Viventia to manufacture the Licensed Products and shall
                  thereafter be free to sell such Licensed Products on which
                  applicable royalties have been paid to Biovation. Sections
                  5(a), 9, 11, 14, 15, 16, 19, 20 and 21 shall survive the
                  expiration or termination of this Agreement.

         (d)      Neither Party may terminate this Agreement for breach without
                  first giving the alleged breaching Party written notice of the
                  acts or omissions alleged to constitute a breach and providing
                  a reasonable period of time to cure such alleged breach of not
                  less than sixty (60) days with respect to the payment of money
                  and not be less than one hundred twenty (120) days for any
                  other acts.

6.       MUTUAL REPRESENTATIONS AND WARRANTIES.

         Each Party hereby represents and warrants to the other Party as
follows:

         (a)      It is duly organized, validly existing and in good standing
                  under the laws of the jurisdiction in which it is
                  incorporated, and has full power and authority and the legal
                  right to own and operate its property and assets and to carry
                  on its business as it is now being conducted and as
                  contemplated in this Agreement, including, without limitation,
                  the right to grant the licenses granted hereunder.

         (b)      As of the Effective Date, (i) it has the power and authority
                  and the legal right to enter into this Agreement and perform
                  its obligations hereunder; (ii) it has taken all necessary
                  corporate action on its part required to authorize the
                  execution and delivery of the Agreement and the performance of
                  its obligations hereunder; and (iii) the Agreement has been
                  duly executed and delivered on behalf of such Party, and
                  constitutes a legal, valid and binding obligation of such
                  Party and is enforceable against it in accordance with its
                  terms.

         (c)      As of the Effective Date, it has sufficient legal and/or
                  beneficial title under its intellectual property rights
                  necessary to perform activities


                                       10


                  contemplated under this Agreement and to grant the licenses
                  contained in this Agreement exclusively to Viventia free and
                  clear of the rightful claim of any third party.

7.       LIMITATION ON WARRANTIES.

         (a)      Nothing in this Agreement or in any licenses granted pursuant
                  to this Agreement shall be construed as a representation or
                  warranty that any of the Licensed Patent Rights are valid or
                  that any manufacture, use, sale or other disposal of the
                  Licensed Products is not an infringement of any patents or
                  other rights not vested in Biovation.

         (b)      BIOVATION MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
                  IMPLIED, REGARDING THE LICENSED TECHNOLOGY AND LICENSED PATENT
                  RIGHTS, DEIMMUNISED PLASMIDS, OR DEIMMUNISED PROTEINS,
                  INCLUDING WITHOUT LIMITATION, ANY REPRESENTATION OR WARRANTY
                  REGARDING VALIDITY, ENFORCEABILITY, MERCHANTABILITY, FITNESS
                  FOR A PARTICULAR PURPOSE, INCLUDING ANY CLINICAL PURPOSE OR
                  OTHER USE WITH RESPECT TO HUMANS OR NON-INFRINGEMENT OF THIRD
                  PARTY RIGHTS. ALL TECHNOLOGY PROVIDED TO VIVENTIA BY BIOVATION
                  HEREUNDER IS PROVIDED "AS IS."

8.       VIVENTIA COVENANTS.

         (a)      Viventia shall promote the sale of the Licensed Products of
                  good marketable quality and shall use reasonable endeavours to
                  meet the market demand therefore.

         (b)      Viventia will use all Licensed Technology and Licensed Patent
                  Rights, licensed hereunder, in compliance with all applicable
                  laws and regulations, including but not limited to, those
                  relating to animal testing, biotechnological research or the
                  handling and containment of biohazardous materials.

9.       INDEMNIFICATION BY VIVENTIA.

         Viventia shall indemnify, defend and hold harmless Biovation, its
         Affiliates and their respective directors, officers, employees, and
         agents and their respective successors, heirs and assigns (the
         "Biovation Indemnitees"), against any liability, damage, loss or
         expense (including reasonable attorneys' fees and expenses of
         litigation) (collectively, "Losses") incurred by or imposed upon the
         Biovation Indemnitees, or any one of them, in connection with any
         claims, suits, actions, demands or judgments of third parties,
         including without limitation personal injury and product liability
         matters and claims of suppliers and Viventia employees (except in cases
         where such claims, suits, actions, demands or judgments result from a
         material breach of this Agreement, negligence or wilful misconduct on
         the part of Biovation) arising out of (a) the breach or alleged breach
         of any representation, warranty or covenant of


                                       11


         Viventia under Sections 6, 7 or 8 hereof, (b) the negligence or
         misconduct of Viventia, its Affiliates or their respective employees or
         agents; or (c) the development, testing, production, manufacture,
         promotion, import, sale or use by any person of any Licensed Product
         which is manufactured or sold by Viventia or by an Affiliate,
         sublicensee, distributor or agent of Viventia.

10.      DILIGENCE.

         Viventia agrees to exercise reasonable commercial efforts to seek
         regulatory approval to market Licensed Products and develop markets for
         and market Licensed Products.

11.      OWNERSHIP OF LICENSED TECHNOLOGY AND LICENSED PATENT RIGHTS.

         (a)      Viventia acknowledges and agrees that as between the Parties,
                  Biovation shall own all Licensed Technology, and Licensed
                  Patent Rights.

         (b)      Except as provided in paragraph (c) below, Biovation and its
                  Affiliates shall have the right, but not the obligation to
                  prosecute, file and maintain any patent applications or
                  patents relating to any Licensed Patent Rights. To the extent
                  that Biovation decides not to prosecute, file, or maintain any
                  Licensed Patent Rights, it shall notify Viventia of same and
                  Viventia shall have the right, but not the obligation to
                  prosecute, file and maintain any patent applications or
                  patents with respect to Licensed Patent Rights reasonably
                  related to Licensed Products; Biovation shall reasonably
                  cooperate with Viventia in such filings.

         (c)      Viventia shall have the right, but not the obligation, to
                  prosecute, file and maintain any patent applications or
                  patents relating to any Licensed Patent Rights that claim or
                  are otherwise directed to Deliverables, Deimmunised Plasmids
                  and Deimmunised Proteins (including compositions comprising
                  same and methods of making or using all of the foregoing. To
                  the extent that Viventia decides not to prosecute, file or
                  maintain any such patents or applications, it shall notify
                  Biovation of same and Biovation shall have the right, but not
                  the obligation to prosecute, file and maintain them; Vivenia
                  shall reasonably cooperate with Biovation in such filings.

12.      INFRINGEMENT.

         (a)      Each Party shall notify the other promptly after such Party
                  becomes aware of any alleged infringement of any Licensed
                  Patent Rights in any country through the sale of a Licensed
                  Product.

         (b)      If any of the Licensed Patent Rights under which Viventia
                  holds a license is infringed by a third party through the sale
                  of a Licensed Product, Biovation shall have the right and
                  option, but not the obligation, to bring an action for
                  infringement, at its sole expense,


                                       12


                  against such third party in the name of Biovation and/or in
                  the name of Viventia, and to join Viventia as a plaintiff if
                  required. Biovation shall promptly notify Viventia of any such
                  action and shall keep Viventia informed as to the prosecution
                  of any action for such infringement. Biovation shall have the
                  full control over the conduct of such litigation including
                  settlement thereof; provided, however, that Biovation shall
                  make no decision, including, but not limited to, any
                  settlement with respect to such infringement which adversely
                  affects the validity or enforceability or scope of the
                  Licensed Patent Rights or detracts from the exclusivity of the
                  license granted to Viventia hereunder without the prior
                  written consent of Viventia. In the event that Biovation does
                  not institute an infringement proceeding against an infringing
                  third party within one hundred twenty (120) days after
                  becoming aware or receiving notice of any alleged infringement
                  through the sale of a Licensed Product for which it has a
                  right and option to bring an action under this Section 12(b),
                  then Viventia shall have the right and option, but not the
                  obligation, to institute such an action and to retain any
                  recovered damages. If by statute or regulation, a delay of one
                  hundred twenty (120) days would result in a diminshment of
                  rights, including by way of example but not limitation loss of
                  the opportunity for a stay of approval of an infringing
                  product, then the one hundred twenty (120) day period above
                  shall be shortened to the extent required to end ten (10) days
                  before the date on which the diminishment of rights would
                  occur.

         (c)      In any infringement suit either Party may institute to enforce
                  any rights pursuant to this Agreement, the other Party hereto
                  shall, at the request of the Party initiating such suit,
                  cooperate in all respects and, to the extent reasonably
                  possible (without adversely affecting the other Party's normal
                  business operations), have its employees testify when
                  requested and make available relevant records, papers,
                  information, samples, specimens, and the like. All reasonable
                  out-of-pocket costs incurred in connection with rendering
                  cooperation requested hereunder shall be paid by the Party
                  requesting cooperation.

         (d)      The costs and expenses of any action instituted pursuant to
                  this Section 12 including reasonable fees of attorneys and
                  other professionals) shall be borne by the Party instituting
                  the action, or, if the Parties elect to cooperate in
                  instituting and maintaining such action, such costs and
                  expenses shall be borne by the Parties in such proportions as
                  they may agree in writing. Each Party shall execute all
                  necessary and proper documents and take such actions as shall
                  be appropriate to allow the other Party to institute and
                  prosecute such infringement actions (if such other Party has
                  the right to institute and prosecute such infringement actions
                  pursuant to this Section 12).

13.      INSURANCE.

         Viventia shall maintain comprehensive general liability insurance in
         the amount of [                                           ] per
         occurrence during the term of this Agreement and Product Liability
         Insurance in the amount of


                                       13


         [                                           ] per occurrence for all
         periods during which it has a Licensed Product for sale. Viventia shall
         list Biovation as an "Additional Insured" under its insurance policies
         described above and shall provide a certificate of insurance to
         Biovation reflecting the same.

14.      NOTICES.

         (a) All notices and statements to either Party required under this
         Agreement shall be made in writing delivered via certified mail, return
         receipt requested, courier, provided that evidence of delivery is made,
         or facsimile with confirmation of such transmission addressed to such
         Party at the following addresses or faxed to the appropriate numbers
         set forth below (with the copies to other parties set forth below) or
         to such other address as may be designated from time to time:

         To Biovation:                  With a copy to:
         Biovation Limited              Mintz, Levin, Cohn, Ferris, Glovsky and
         Crombie Lodge                  Popeo PC
         Aberdeen Science Park          One Financial Center
         Balgownie Drive                Boston, MA 02111
         Aberdeen AB22 8GU              Attention: Jeffrey M. Wiesen, Esquire
         Scotland                       Tel: 617-542-6000
         Attention: Dr. Frank J. Carr   Fax: 617-542-2241
         President

         Tel:     44 1224 707337
         Fax:     44 1224 708816

         To Viventia:                   With a copy to:

         Viventia Biotech, Inc.         Kenyon & Kenyon
         10 Four Seasons Place          One Broadway
         Suite 501                      New York, NY 10004-1050
         Toronto, ON M9B 6H7            Attention: Richard L. DeLucia, Esq.
         Canada                         Tel:  212-425-7200
         Attention: Dr. Nick Glover     Fax:  212-425-5288
         President & CEO
         Tel:     1 416 291 1277
         Fax:     1 416 335 9306

         (b)      All notices and statements provided to a Party hereunder shall
                  be deemed to have been given as of the date received, or at
                  the time of delivery of a facsimile to the relevant facsimile
                  number above.

         (c)      Each Party hereto may change its address and contact
                  information set forth above for the purpose of this Agreement
                  by providing written notice to the other Party of the same
                  from time to time.



                                       14




15.      TREATMENT OF CONFIDENTIAL INFORMATION.

         For purposes of this Agreement, "Confidential Information" shall mean
         with respect to a Party (the "Receiving Party"), all information,
         including without limitation, any Technology disclosed by the other
         Party (the "Disclosing Party") to the Receiving Party or to any of its
         employees, consultants, Affiliates, or sublicensees, whether in
         writing, or by oral or visual disclosure or presentation, provided,
         however, that "Confidential Information" shall not include information
         that:

         (a)      was known to Receiving Party at the time such Confidential
                  Information was received by the Receiving Party or its
                  Affiliates, as shown by written documentation, other than by
                  virtue of a prior confidential disclosure to such Receiving
                  Party or its Affiliates; or

         (b)      was publicly known when received from Disclosing Party or
                  thereafter becomes publicly known through no fault or omission
                  of Receiving Party; or

         (c)      is made known to Receiving Party by a third party who did not
                  derive it from Disclosing Party and who has a lawful right to
                  make such disclosure free from any obligation of
                  confidentiality to the Disclosing Party; or

         (d)      is independently developed by or for the Receiving Party
                  without reference to or reliance upon any Confidential
                  Information; or

         (e)      is approved for disclosure by prior written consent of
                  Disclosing Party; or

         (f)      is required to be disclosed by government authority; provided;
                  however, that Receiving Party has provided reasonable advance
                  notice of the impending disclosure to Disclosing Party and
                  will disclose the Confidential Information to the extent
                  necessary and to such authority only.

         The Receiving Party agrees that it will hold the Confidential
         Information received from the Disclosing Party in secrecy and
         confidence and will not disclose it to any third party, nor use it for
         any purpose other than for the purpose of the performance of this
         Agreement (which includes with respect to Viventia the full enjoyment
         of the license rights granted to it by Biovation). Each Party further
         agrees that it will restrict disclosure of the Confidential Information
         within its own organisation and affiliates to those persons having a
         need to know it for the purpose of this Agreement, and that such
         persons will be advised of the obligation set forth in this Agreement
         and obligated in like fashion. The above obligations of the Receiving
         Party with respect to its treatment of Confidential Information shall
         commence as of the Effective Date and continue through the term of this
         Agreement and for a period of five (5) years thereafter. This Agreement
         shall not be construed as granting any license rights with respect to
         the Confidential Information. Except as otherwise required by
         applicable laws and regulations, the Parties hereby


                                       15


         agree that any disclosure of the terms and conditions of this Agreement
         (including disclosure in connection with potential stock exchange
         listings, if any) shall be subject to the other Party's prior written
         mutual agreement; provided, however, that each Party may disclose the
         terms and conditions of this Agreement to a prospective investor, and
         Viventia may disclose the terms of this Agreement to a prospective
         sublicensee or marketing partner for a Licensed Product, pursuant to a
         written confidentiality agreement.

16.      WAIVER.

         The waiver by Biovation of any breach, default or omission in the
         performance or observance of any of the terms of this Agreement by
         Viventia shall not be deemed to be a waiver of any other such breach,
         default or omission.

17.      FORCE MAJEURE.

         If the performance of this Agreement or any obligation hereunder
         (except for the payment of money) is prevented, restricted or
         interfered with by reason of fire or other casualty or accident,
         strikes or labour disputes, inability to procure raw materials, power
         or supplies, war, invasion, civil commotion or other violence,
         compliance with any order of any governmental authorities or any other
         act or conditions whatsoever beyond reasonable control of either Party
         hereto, the Party so affected upon giving a prompt notice to the other
         Party shall be excused from such performance to the extent of such
         prevention, restriction or interference; provided however that the
         Party so affected shall use commercially reasonable efforts to avoid or
         remove such causes of non-performance and shall continue performance
         hereunder with the utmost dispatch whenever such causes are removed, to
         the extent commercially reasonable.

18.      ASSIGNMENT.

         This Agreement shall not be assigned by either Party without the prior
         written consent of the other Party, which consent shall not be
         unreasonably withheld. Notwithstanding the foregoing, in the event of a
         merger, consolidation or similar reorganization of either Party with or
         into another party, or in the event of a sale of all or substantially
         all of the assets of a Party, or with respect to Viventia in the event
         of the sale of the business unit or Licensed Product to which this
         Agreement pertains, this Agreement shall be assigned to or become the
         obligation and liability of the acquiring entity, subject to the
         written notification of such acquisition or merger to the other Party.
         Any purported assignment in violation of this Section 18 shall be void.
         The terms and conditions of this Agreement shall be binding upon and
         inure to the benefit of the permitted successors and assigns of the
         Parties.

19.      GOVERNING LAW.

         This Agreement shall be governed and interpreted in accordance with the
         laws of New York without reference to its choice-of-law rules, except
         that any issue


                                       16


         concerning interpretation, infringement, validity, enforceability,
         term, or effect of a patent shall be governed by national law of the
         country of such patent.

20.      ARBITRATION.

         All disputes, differences or controversies arising out of or in
         connection with this Agreement, its interpretation, performance, or
         termination, which may arise between the Parties arising out of, or
         related to, this Agreement shall be amicably settled between the
         Parties. In case of failure of amicable settlement between the Parties,
         it shall be finally settled by binding arbitration conducted in New
         York City in accordance with the Rules of Concilliation and Arbitration
         of the International Chamber of Commerce (Paris, France) (the "ICC").
         The arbitration panel shall be composed of three arbitrators, one of
         whom shall be selected by Biovation, one of whom shall be selected by
         Viventia and the third of whom shall be selected by the two so
         selected. If both or either of Biovation or Viventia fails to select an
         arbitrator or arbitrators within fourteen (14) days after receiving
         notice of commencement of arbitration or if the two arbitrators fail to
         select a third arbitrator within fourteen (14) days after their
         appointment, the ICC shall, in accordance with said rules, upon the
         request of both or either of the Parties to the arbitration, appoint
         the arbitrator or arbitrators required to complete the panel.
         Notwithstanding the terms contained in Section 19 of this Agreement,
         U.S. patent law shall govern any disputes with respect to inventorship
         under Sections 4.4, 4.5 and 4.6 of this Agreement.

         The Parties shall share the costs of the arbitration, including
         administrative and arbitrators' fees equally. Each Party shall bear its
         own costs and attorneys' and witnesses' fees; provided, however, that
         the prevailing Party, as determined by the arbitration panel, shall be
         entitled to an award against the other Party in the amount of the
         prevailing Party's costs and reasonable attorneys' fees. If judicial
         enforcement or review of the arbitrator's decision is sought, the
         prevailing Party shall be entitled to costs and reasonable attorneys'
         fees in addition to any amount of recovery ordered by the court.

         Any dispute between the Parties related to or arising from this
         Agreement or the Parties' relationship hereunder that is not
         arbitrable, including any action to confirm, enforce, modify, or set
         aside an arbitration award, shall be heard exclusively in the state or
         federal courts located in New York County, New York, to the exclusion
         of all other courts, and the parties consent to the jurisdiction and
         venue of such courts for such purpose.

21.      MISCELLANEOUS.

         21.1 Acknowledgement. Each Party acknowledges that it has negotiated
         and entered into this Agreement in good faith.

         21.2 Severability. In the event any one of the provisions of this
         Agreement is held unenforceable or in conflict with the law of any
         jurisdiction, the validity of the remaining provisions shall not be
         affected by such holding. The Parties agree to negotiate and amend in
         good faith such provision in a manner consistent with the intentions of
         the Parties as expressed in the Agreement if


                                       17


         any invalid or unenforceable provision affects the consideration of
         either Party.

         21.3 Interpretation. The Parties acknowledge and agree that: (i) each
         Party and its counsel reviewed and negotiated the terms and provisions
         of this Agreement and have contributed to its revision; (ii) the rule
         of construction to the effect that any ambiguities are resolved against
         the drafting Party shall not be employed in the interpretation of this
         Agreement; and (c) the terms and provisions of this Agreement shall be
         construed fairly as to all Parties hereto and not in favor of or
         against any Party, regardless of which Party was generally responsible
         for the preparation of this Agreement.

         21.4 Entirety of Agreement. This Agreement contains the entire
         understanding of the Parties hereto with respect to the subject matter
         contained herein. There are no restrictions, promises, covenants or
         understandings other than those expressly set forth herein, and no
         rights or duties on the part of either Party are to be implied or
         inferred beyond those expressly herein provided for. The Parties may,
         from time to time during the term of this Agreement, amend, modify,
         vary, waive or alter any of the provisions of this Agreement, but only
         by a written instrument that makes specific reference to this Agreement
         which is duly executed by each Party, or in the case of waiver, by the
         Party or Parties waiving compliance.

         21.5 Further Assurances. Each Party agrees to duly execute and deliver,
         or cause to be duly executed and delivered, such further instruments
         and do and cause to be done such further acts and things, including,
         without limitation, the filing of such additional assignments,
         agreements, documents and instruments, that may be necessary or as the
         other Party hereto may at any time and from time to time reasonably
         request in connection with this Agreement or to carry out more
         effectively the provisions and purposes of, or to better assure and
         confirm unto such other Party its rights and remedies under, this
         Agreement.

         21.6 No Partnership. For the purposes of this Agreement and all
         obligations to be performed hereunder, each Party shall be, and shall
         be deemed to be, an independent contractor and not an agent, partner,
         joint venturer or employee of the other Party. Neither Party shall have
         authority to make any statements, representations or commitments of any
         kind, or to take any action which shall be binding on the other Party,
         except as may be explicitly provided for herein or authorized in
         writing.

         21.7 Research Agreement. This Agreement supersedes the Research
         Agreement with respect to any subject matter addressed herein or any
         inconsistency.




                                       18





         IN WITNESS whereof the Parties have caused this Agreement to be duly
         executed in duplicate originals by their respective officers hereunto
         duly authorized, of which one original is to be held by each Party.

         BIOVATION LIMITED                      VIVENTIA BIOTECH, INC.



         By:   /s/ Frank J. Carr                By:   /s/ Nick Glover
               -----------------                      ------------------
               Dr. Frank J. Carr                      Nick Glover, Ph.D.
               President                              President & CEO





                                       19



                                   SCHEDULE A

                         VIVENTIA'S PROTEIN = [        ]

                   DEIMMUNISED PROTEIN = [                    ]










                                       20



                                   SCHEDULE B

                               JOINT PATENT RIGHTS










                                       21



                                   SCHEDULE C

                             LICENSED PATENT RIGHTS

                         DEIMMUNISATION PATENT FAMILIES

DEIMMUNISATION I

         WO 98/52976 (international publication date 26-Nov-98)
         Method for the production of non-immunogenic proteins

         Regional Applications:

              USA              US 10/300215
              Europe           EPO 98922932.3
              Japan            550129/98
              Canada           2290485
              Australia        75393/98



DEIMMUNISATION II

         WO 00/34317 (international publication date 15-Jun-00)
         Modifying protein immunogenicity

         Regional Applications:

              USA              09/633516
              Europe           EPO 99959535.8
              Japan            2000-586759
              China            99804401.6
              Australia        16676/00
              Mexico           0007746
              Canada           2342967



DEIMMUNISATION III

         WO 02/069232 (international publication date 6-Sept-02)
         Method for identification of T-cell epitopes and use for preparing
         molecules with reduced immunogenicity






                                       22