Filed by IGEN International, Inc. pursuant to Rules 165 and 425 promulgated
under the Securities Act of 1933, as amended, and deemed filed pursuant to
Rule 14a-12 promulgated under the Securities Exchange  Act of 1934, as
amended.

Investors and security holders are urged to read the proxy  statement/prospectus
regarding  the business  combination  transaction  referenced  in the  foregoing
information,  when it  becomes  available,  because  it will  contain  important
information.  The proxy  statement/prospectus  will be filed with the Securities
and Exchange Commission by IGEN and IGEN Integrated  Healthcare,  LLC. Investors
and  security  holders may obtain a free copy of the proxy  statement/prospectus
(when it is available)  and other  documents  filed by IGEN and IGEN  Integrated
Healthcare,  LLC with the SEC at the  SEC's web site at  www.sec.gov.  The proxy
statement/prospectus  (when it is available) and these other  documents may also
be obtained  for free from IGEN by  directing  a request to IGEN  International,
Inc., 16020 Industrial Drive, Gaithersburg, MD 20877, (301) 869-9800, Attention:
Secretary.

IGEN,  its  directors,  and certain of its executive  officers may be considered
participants  in the  solicitation  of proxies in  connection  with the business
combination  transaction  referenced in the foregoing  information.  Information
about the directors and executive  officers of IGEN and their  ownership of IGEN
stock is set forth in IGEN's Proxy  Statement with respect to its Annual Meeting
for the year ended March 31, 2003.  Investors may obtain additional  information
regarding   the   interests   of  such   participants   by  reading   the  proxy
statement/prospectus when it becomes available.


Subject Company: IGEN International, Inc.
Commission File No.: 000-23252




                            IGEN International, Inc.
            First Quarter Financial Results and IGEN-Roche Agreement
                             Conference Call Script

                                  July 30, 2003
                                   4:30 PM EDT

OPERATOR:                  Introduction.

Migausky:                  Welcome to IGEN's conference call.

                           Before we start, I'd like to remind you that we will
                           be making forward-looking statements during this
                           call. Comments that relate to the Roche litigation
                           and transaction, trends and changes in financial or
                           operational performance, technology or product plans,
                           revenue growth and prospective new licensing or
                           business agreements, are forward-looking statements.
                           We have based these forward-looking statements on
                           management's current expectations, estimates and
                           projections and they are subject to a number of
                           risks, uncertainties and assumptions which could
                           cause actual results to differ materially from those
                           described in the forward-looking statements. The
                           following factors are among those that may cause
                           actual results to differ materially from our
                           forward-looking statements: our ability to develop
                           and introduce new or enhanced products; our ability
                           to enter into new collaborations; our ability to
                           develop our manufacturing, selling, marketing and
                           distribution capabilities; protection and validity of
                           patent and other intellectual property rights and our
                           ability to enforce those rights. Actual results might
                           differ materially from these statements due to risks
                           and uncertainties. Detailed descriptions of the risks
                           and uncertainties that apply to IGEN appear in our
                           Annual Report on Form 10-K and other SEC filings.
                           IGEN disclaims any intent or obligation to update
                           these forward-looking statements.







                           In addition, investors and security holders are urged
                           to read the proxy statement/prospectus regarding the
                           business combination transaction with Roche when it
                           becomes available, because it will contain important
                           information. The proxy statement/prospectus will be
                           filed with the Securities and Exchange Commission.
                           Investors and security holders may obtain a free copy
                           of the proxy statement/prospectus (when it is
                           available) and other documents related to the
                           transaction at the SEC's web site at www.sec.gov. The
                           proxy statement/prospectus (when it is available) and
                           these other documents may also be obtained for free
                           from IGEN by directing a request to IGEN
                           International, Inc., 16020 Industrial Drive,
                           Gaithersburg, MD 20877, Attention: Secretary.

                           IGEN, its directors, and certain of its executive
                           officers may be considered participants in the
                           solicitation of proxies in connection with the
                           business combination transaction referenced in the
                           conference call today. Information about the
                           directors and executive officers of IGEN and their
                           ownership of IGEN stock is set forth in IGEN's Proxy
                           Statement with respect to its Annual Meeting.
                           Investors may obtain additional information
                           regarding the interests of such participants by
                           reading the proxy statement/prospectus when it
                           becomes available.

                           Now I'll turn the call over to Sam Wohlstadter,
                           Chairman and CEO of IGEN.


Wohlstadter:               Thank you and thanks to all our shareholders
                           for joining us today. On the call today are
                           Dr. Richard Massey, President and COO, George
                           Migausky, CFO, and Dan Abdun-Nabi, our General
                           Counsel. We will discuss the definitive agreements we
                           signed with Roche last week and also briefly discuss
                           IGEN's first quarter financial results for the
                           quarter ended June 30, 2003.






                           Let me begin by saying that we are extremely pleased
                           to have resolved our long-running dispute with Roche
                           on their right to the continued use of our ORIGEN
                           technology. A key objective for us during the
                           negotiation of these agreements was to deliver
                           significant near-term value to shareholders.We
                           believe we have achieved that goal. The structure of
                           the Roche transaction also provides our shareholders
                           with the opportunity to participate in a new publicly
                           traded company.

                           First, through the acquisition of IGEN, shareholders
                           get a substantial cash premium - a payment of $47.25
                           per share, which is higher than IGEN shares had ever
                           traded prior to the announcement of the transaction.
                           In fact this is a 37% premium to our closing stock
                           price on July 21st, which was the last day prior to
                           the published press reports of a potential
                           transaction between IGEN and Roche.

                           Second, in addition to the cash payment, IGEN
                           shareholders will have the potential to benefit from
                           additional value creation in the future through 100%
                           ownership of a new public company which will be spun
                           off by IGEN. We are very excited about the new
                           company's potential to generate additional
                           significant value for shareholders and we are
                           committed to make that happen. The new spin-off
                           company will be well-positioned to compete in the
                           global biodefense, clinical testing, life science,
                           and industrial markets - including the opportunity to
                           address the entire clinical diagnostics market. This
                           includes hospitals, blood banks, and reference labs.
                           The new non-exclusive arrangement with Roche also
                           enables the new company to seek strategic
                           partnerships with a wide range of companies in the
                           global marketplace to address the $6 billion clinical
                           immunodiagnostic testing market, as well as the $1.2
                           billion DNA probe market. It will own the ORIGEN
                           technology and is expected to begin with
                           approximately $155 million in working capital
                           provided primarily by Roche as part of this
                           transaction.






                           It has been a long and arduous road but we have
                           achieved what we believe is an excellent outcome for
                           IGEN and its shareholders - and one that is
                           beneficial to Roche as well. I would like to thank
                           everyone at IGEN for their dedication and hard work,
                           and especially our customers for their commitment to
                           the company throughout this process. I would also
                           like to thank our loyal shareholders for their
                           steadfast support.

                           Next, George Migausky will provide comments on IGEN's
                           first quarter financial results and then discuss the
                           details of the Roche transaction.

Migausky:                  Thank you, Sam.
                           This will be a review of IGEN's operating results for
                           the first quarter of its fiscal year ending March 31,
                           2004. First, I will provide a summary of results
                           released earlier today.


                                                        3 Mo. Ended 06/30
                                                      2003              2002
                                                      ----------------------

                           REVENUE                   17.1              12.0

                           INCOME (LOSS)
                           FROM OPS                  (0.8)             (2.2)

                           NET LOSS                  (7.2)             (7.4)

                           LOSS PER SHARE           $0.30             $0.33

                           SHARES USED               23.8              23.2


                           REVENUE BREAKDOWN:

                           Royalties                 11.6               8.1
                           Product Sales              5.4               3.6

                           Contract Fees              0.1               0.3
                           -----------------------------------------------

                       We have been delivering the double-digit revenue growth
                       that has been our goal. This has been occurring each
                       quarter now for the last 2 + years. Revenue for the
                       quarter grew by 42% over last year, including a 51%
                       growth in direct product sales of IGEN.

                       The revenue growth - together with reduced expenditures
                       in certain areas - has provided an improvement in the
                       bottom line. The operating loss and net loss for the
                       quarter decreased from a year ago, with the net loss
                       lower by approximately 2% for the quarter, despite an
                       increase in Roche litigation related costs of $2.5
                       million.

                       Royalties - The royalties grew by 42% for the quarter to
                       $11.6 million. This includes a one-time true-up of Roche
                       royalties from prior quarters of approximately $700,000.
                       Without the one-time true-up, the royalties still would
                       have increased 34%. All of the Roche royalties come from
                       Roche sales, as reported by Roche to us. Looking ahead,
                       it is important to note that under the agreements signed
                       last week, Roche will no longer pay royalties to IGEN.
                       Rather, effective July 1, 2003, Roche will pay IGEN $5
                       million per month for the use of ORIGEN technology
                       through closing of the transaction only. We will speak
                       more about the Roche agreements in a moment.

                       Product sales - Product sales grew by 51% this quarter
                       over last year. We saw continued growth this quarter in
                       our biodefense/industrial sales. These sales, which were
                       approximately $1.5 million for the quarter, were 3 1/2
                       times higher than last year. Biodefense/industrial sales
                       are expected to be a big part of our sales mix going
                       forward, particularly with the Department of Defense
                       contract expansion announced in June. This contract
                       provides for product sales at the election of the
                       government of up to a total of $23 million over four
                       years, with approximately $7 million of product sales
                       through June 2004.


                       Sales of the M-Series instruments and consumable reagents
                       continue to drive the Life Science product sales, which
                       remains the largest single product sales category for the
                       Company. Our growth was a 30% increase in Q1.

                      Physician Office Lab sales were about $600,000 of the
                      total product sales mix for the quarter - a decline of
                      $100,000 from last year's Q1. These Physician Office Lab
                      customers are being served by IGEN under the terms of a
                      court order related to Roche selling outside their
                      licensed field and these customers will be transferred
                      back to Roche when the acquisition closes.

                      For all of the product sales, the consumable reagent and
                      services portion of our business was approximately 65% of
                      the sales mix this quarter with instrumentation making up
                      the remainder.

                      With the product sales traction, recent product launches
                      (such as the M-1), and the biodefense opportunity, our
                      goal remains and we continue to believe that IGEN's growth
                      will well exceed the industry average.

                      Litigation Costs -
                      Costs associated with the Roche litigation - including
                      appellate work, patent infringement suits prepared and
                      filed by IGEN, settlement negotiations and the merger
                      transaction itself - increased this quarter to $3.6
                      million. As Dan Abdun-Nabi will relay in a moment, these
                      litigations are now all finished and the costs should be
                      dramatically reduced. There will of course, be costs
                      (legal, accounting and investment banking) associated with
                      the consummation of the merger and the registration and
                      listing of the new company.

                      Now I will review the terms of the agreements with Roche.
                      These comprehensive agreements have been approved by the
                      Boards of Directors of both IGEN and Roche.

                      Under the terms of the agreements, Roche will acquire
                      IGEN, thereby securing non-exclusive rights to ORIGEN
                      technology in the human in-vitro diagnostics field. For
                      each IGEN share, IGEN shareholders will receive $47.25 in
                      cash and one share of a newly formed public company to be
                      spun off by IGEN. The new company will be 100% owned by
                      IGEN shareholders.


                      It's obviously impossible for us to predict the value of
                      the new company and how it will trade in the public
                      market. In approximately 6 weeks, IGEN will be filing a
                      proxy statement / prospectus with the SEC, which will
                      provide much more information on the new company. Until we
                      file this document, we are in a period where we are
                      restricted about what we can say about the new company.
                      Therefore, today we will cover only certain aspects of the
                      new company.

                      The new company will hold IGEN's patents, and assume
                      IGEN's biodefense, life science and industrial businesses,
                      as well as IGEN's opportunities in the clinical
                      diagnostics field. As Sam mentioned earlier, since Roche's
                      rights to ORIGEN technology will be non-exclusive, the new
                      company will have the opportunity to address the entire $6
                      billion clinical immunodiagnostics testing market -
                      including hospitals, blood banks, and reference labs,
                      either directly or through new strategic partnerships. It
                      will also be able to address the $1.2 billion DNA probe
                      market.

                      In addition, the new company will hold IGEN's interests in
                      the Meso Scale Diagnostics ("MSD") joint venture. Rich
                      Massey will speak about the MSD joint venture in a moment
                      including the new company's obligation to make a final
                      $37.5 million contribution to MSD.

                      Importantly, the new company will receive rights to
                      certain improvements relating to Roche's Elecsys product
                      line and licenses to PCR - a valuable DNA testing
                      technology. The royalty-bearing licenses with Roche for
                      PCR enables us to use the license in most diagnostics
                      fields. We are pleased to have secured these improvements
                      and PCR licenses and expect that the future businesses
                      established by the new company will be enhanced as a
                      result.

                      As stated earlier, we expect that the new company will
                      start with approximately $155 million in net working
                      capital. Let me briefly summarize the mechanics as to how
                      we get there.






                      First, we have the existing cash in IGEN and the ongoing
                      revenues of the business between signing and closing.
                      Roche has already paid $18.6 million in damages upheld by
                      the Fourth Circuit Court of Appeals, royalties due for the
                      period through June 30, 2003 and will continue to pay $5
                      million per month for use of the ORIGEN technology until
                      closing. Separately, prior to closing, Roche will provide
                      an additional $214 million to IGEN.

                      A portion of these funds will be utilized to support
                      IGEN's ongoing business through the closing, as IGEN will
                      pay its operating costs and other obligations between
                      signing and closing. It will also pay the transaction
                      costs associated with the deal, and repay its Senior
                      Secured Notes. Then, IGEN will contribute all of its
                      remaining cash, together with certain of its other assets
                      and liabilities to the new company. The new company will
                      sell MSD-related preferred stock to Sam Wohlstadter to
                      fund the portion of the final MSD contribution in excess
                      of $30 million. The new company will also pay $50 million
                      to Roche for the PCR licenses. Therefore, when all is
                      complete, the new company is expected to have
                      approximately $155 million in cash and no debt
                      obligations, except for routine trade payables.
                      Among the uses of this working capital is the final $37.5
                      million investment in MSD.  The new company's
                      obligation to make this final contribution to MSD is
                      separate from IGEN's existing obligation to provide
                      funding to MSD through November 30, 2003.

                      We expect to list the new company's shares on Nasdaq after
                      the completion of the spin-off. It will be managed by
                      IGEN's current management team and headquartered in
                      Gaithersburg, Maryland. As I mentioned, a more complete
                      description of the new company and its business will be
                      available in the proxy statement / prospectus. Until then,
                      we cannot provide more information about the new company
                      beyond what we have said today.

                      I will now turn the call over to Rich Massey, who will
                      describe how the Roche transaction affects the MSD joint
                      venture arrangements.






Massey:               Thank you, George.

                      By way of background, Meso Scale Diagnostics is a joint
                      venture initially formed in 1995 by IGEN and Meso Scale
                      Technologies ("MST") to develop and commercialize products
                      that combine IGEN's ORIGEN technology and MST's
                      multi-array technology. In the last year, MSD launched its
                      first two instrument systems.

                      In conjunction with the Roche transaction, IGEN's
                      interests in, and rights and obligations under, the MSD
                      joint venture will be transferred to the new company that
                      will be spun off to the IGEN shareholders. This includes
                      both IGEN's 31% equity interest and its Class C Preferred
                      Return interest in MSD, which generally provides for a
                      preferred return payable out of a portion of MSD's future
                      profits and certain third-party financings.

                      The transfer of these interests from IGEN to the new
                      company required MSD's consent. As part of obtaining that
                      consent, IGEN and MSD amended certain of the MSD
                      agreements. An independent committee of IGEN's Board of
                      Directors with the advice of independent counsel
                      negotiated and approved those amendments, which include
                      providing additional funding to MSD following the
                      completion of the Roche transaction.

                      The additional funding contemplated by these amendments
                      requires the new company to make a final $37.5 million
                      contribution to MSD. Samuel Wohlstadter, IGEN's Chairman
                      and CEO has agreed to provide the portion of this
                      contribution that is greater than $30 million through the
                      purchase of a new series of preferred stock in the new
                      company. The economic characteristics of this series of
                      preferred stock will mirror the new company's economic
                      interest in its Class C preferred return interest in MSD.
                      Neither IGEN nor the new company will have any additional
                      funding obligations related to MSD after completion or
                      termination of the Roche transaction.

                      As part of the Roche transaction, the MSD joint venture
                      agreement will expire on November 30, 2003 or, if later,
                      the completion or termination of the Roche transaction.

                      Upon the expiration of the MSD joint venture agreement,
                      MSD and MST have the right to buy out all of IGEN's (or
                      the new company's) interests in MSD at fair market value
                      determined under the joint venture agreement less a
                      specified discount. If MSD or MST exercise this purchase
                      right, the purchase price will be paid out over time from
                      a portion of MSD's future revenues and third party
                      financings. In addition, many of IGEN's (or the new
                      company's) licenses and other arrangements with MSD and
                      MST will continue in accordance with the existing terms
                      with the new company standing in IGEN's place.

                      Additional information about the MSD joint venture can be
                      found in IGEN's filings with the SEC and copies of the
                      licenses and other arrangements with MSD and MST may also
                      be obtained from the SEC.

                      I will now turn the call over to Dan Abdun-Nabi, who will
                      cover the closing conditions and other aspects of the
                      agreements.


Abdun-Nabi:           Thank you, Rich.

                      First, let me briefly discuss how IGEN and Roche have
                      agreed to handle the various lawsuits that are now
                      pending. As part of the comprehensive set of agreements
                      signed last week, IGEN agreed that it would suspend its
                      patent infringement action against Roche in both Maryland
                      and Germany pending consummation of the proposed
                      transaction. IGEN will retain the right to resume both of
                      those suits should the Roche transaction not close. In
                      addition, Roche has agreed to withdraw its petition for
                      rehearing that it filed with the Fourth Circuit Court of
                      Appeals and both companies have agreed to not file any
                      further appeals of the opinion issued by the Fourth
                      Circuit on July 9. Consequently, the opinion of the Fourth
                      Circuit will become final and this litigation will be
                      closed.

                      Let me now briefly discuss our expectations regarding the
                      closing of the Roche transaction. As mentioned in our
                      earlier press release, we expect that the transaction will
                      close by calendar year-end. The conditions to closing the
                      Roche transaction are, in our view, quite limited,
                      straight forward and favorable to IGEN.

                      As part of this process, and as is customary for
                      transactions like this, we are required to, among other
                      things, secure Hart Scott anti-trust clearance, secure
                      stockholder approval of the merger, and file with the SEC
                      a proxy statement / prospectus that will include the
                      details of a special shareholders meeting to be held to
                      vote on the transaction. That document will provide
                      shareholders additional information about both the
                      transaction and the new company to be spun off.

                      We do not anticipate any difficulties with any of the
                      regulatory processes or other closing conditions to the
                      Roche transaction and we are highly confident that the
                      transaction will indeed close. Importantly, Roche has also
                      publicly made it quite clear that that they wish to secure
                      rights to the ORIGEN technology through this transaction.

                      Just a quick and final comment on taxes. As we noted
                      earlier, the acquisition of IGEN by Roche and the spin-off
                      of the new company will be a fully taxable transaction for
                      IGEN shareholders. Because tax matters are complicated and
                      depend on an investor's particular situation, we urge
                      investors to consult with their own tax advisors about the
                      consequences of the transaction.

                      I will now turn the call back over to Sam.


Wohlstadter:          Thank you George, Rich and Dan.  In closing, I would like
                      to express my sincere appreciation to the IGEN Board
                      of Directors for their persistence in pursuing a course
                      of action pending a transaction that we believe
                      maximizes value to all of our shareholders.






                      Finally, and perhaps most importantly, I would like to
                      thank all of the tough monkeys - whether diligently
                      working at the Company or investors who have supported the
                      Company- all have helped to make IGEN a success and set
                      the stage for a bright future.

                      I look forward to being able to discuss the new company
                      with all investors after the proxy statement / prospectus
                      is filed.

Migausky:             Now we will take some questions.  I would ask that
                      everyone limit yourself to one question.  If you have more
                      than one question, please get back in the queue.
                      Operator, please review the instructions for asking
                      questions.
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