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UNITED STATES SECURITIES AND EXCHANGE
COMMISSION

FORM 10-Q

OR

COMMISSION FILE NUMBER 000-21291

INTROGEN THERAPEUTICS, INC.

301 Congress Avenue, Suite 1850
Austin, Texas 78701
(Address of principal executive offices, including zip code)

(512) 708-9310
(Registrant’s telephone number, including area code)

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [ X ] No [    ]

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). Yes [    ] No [ X ]

     As of November 10, 2003, the registrant had 23,660,502 shares of its common stock, $0.001 par value per share, issued and outstanding.

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INTROGEN THERAPEUTICS, INC.

QUARTERLY REPORT ON FORM 10-Q

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PART I
FINANCIAL INFORMATION

Item 1. Condensed Consolidated Financial Statements.

INTROGEN THERAPEUTICS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS
(Amounts in thousands)

The accompanying notes are an integral part of these
condensed consolidated financial statements.

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INTROGEN THERAPEUTICS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(Amounts in thousands, except per share amounts)

(UNAUDITED)

The accompanying notes are an integral part of these
condensed consolidated financial statements.

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INTROGEN THERAPEUTICS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(Amounts in thousands)

(UNAUDITED)

The accompanying notes are an integral part of these
condensed consolidated financial statements.

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INTROGEN THERAPEUTICS, INC. AND SUBSIDIARIES

UNAUDITED NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1.     Business

     See the “Overview” section below in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” for a discussion of our business.

     We have not generated any significant revenues from unaffiliated third parties, nor is there any assurance of future product revenues. Our research and development activities involve a high degree of risk and uncertainty. Our ability to successfully develop, manufacture and market our proprietary products is dependent upon many factors. These factors include, but are not limited to, the need for additional financing, the reliance on collaborative research and development arrangements with corporate and academic affiliates, and the ability to develop manufacturing, sales and marketing experience. Additional factors include uncertainties as to patents and proprietary technologies, competitive technologies, technological change and risk of obsolescence, development of products, competition, government regulations and regulatory approval, and product liability exposure, as well as those factors set forth below under “Risk Factors.” As a result of the aforementioned factors and the related uncertainties, there can be no assurance of our future success.

2.     Basis of Presentation

     The accompanying condensed, consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) and, accordingly, do not include all of the information and footnotes required under generally accepted accounting principles in the United States for complete financial statements. In the opinion of management, all accounting entries considered necessary for a fair presentation have been made in preparing these financial statements. Operating results for the three and nine month periods ended September 30, 2003, are not necessarily indicative of the results that may be expected for the year ending December 31, 2003. For further information, refer to the consolidated financial statements and footnotes thereto as of December 31, 2002, and for the year then ended, included in our Annual Report on Form 10-K as filed with the SEC on March 31, 2003.

3.     Net Loss Per Share

     Net loss per share is computed using the weighted average number of shares of common stock outstanding. Due to losses incurred in all periods presented, the shares associated with stock options, warrants and non-voting convertible preferred stock are not included because they are anti-dilutive.

4.     Stock Based Compensation

     For stock options granted to our directors and employees, we record compensation using the intrinsic value method allowed by Statement of Financial Accounting Standards (SFAS) No. 123, “Accounting for Stock-Based Compensation,” and as set forth under Accounting Principles Board (APB) Opinion No. 25, “Accounting for Stock Issued to Employees,” as clarified by Interpretation No. 44, “Accounting for Certain Transactions Involving Stock Compensation.” Under this method, for stock options granted to our directors and employees, we record compensation expense based on the excess of the market value of our stock over the exercise price of the stock option on the date of the stock option grant. If the exercise price of the stock option is equal to or greater than the market value of our stock on the date of grant, we do not record compensation expense. For stock options granted to persons other than our directors and employees, we record compensation expense based on the fair value method and the Black-Scholes option pricing model. Under both methods, if the compensation expense relates to a stock option that vests over future periods, we defer that expense and amortize that deferral over the vesting period of the stock option, which is generally four years.

     For stock options granted to our directors and employees, we have estimated the fair value of options granted using the Black-Scholes option pricing model. Significant weighted average assumptions used to estimate fair value

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for all years include risk-free interest rates ranging from 3.6 percent to 6.1 percent, expected stock option lives of seven to ten years, no expected dividends and volatility factors ranging from 58.0 percent to 110.8 percent. Had compensation expense for stock options granted to our directors and employees been determined using the Black-Scholes option pricing model allowed under SFAS No. 123, our net loss would have been increased to the following pro forma amounts (in thousands, except per share information):

5.     Investment in VirRx, Inc.

     We have an agreement with VirRx, Inc. (VirRx) to purchase $150,000 of VirRx Series A Preferred Stock on the first day of each quarter through January 1, 2006. We purchased $150,000 and $450,000 of this stock for cash during the three and nine months ended September 30, 2003, respectively. We record these purchases as research and development expense. VirRx is required to use the proceeds from these stock sales in accordance with the terms of a collaboration and license agreement between VirRx and us for the development of VirRx’s technologies. We may unilaterally terminate this collaboration and license agreement with 90 days prior notice, which would also terminate our requirement to make any additional stock purchases. For additional discussion of our agreements with VirRx, see Note 6 to our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2002, filed with the SEC on March 31, 2003.

6.     Sale of Common Stock

     In June 2003, we sold 2.0 million shares of our common stock for an aggregate purchase price of $11.5 million to selected institutional investors through a private placement pursuant to Regulation D promulgated under the Securities Act of 1933, as amended. Our net proceeds from this transaction, after related fees and expenses, were $10.8 million. In connection with this sale, we issued warrants to purchase 400,000 shares of our common stock at $7.89 per share. These warrants are exercisable at any time by the warrant holders through June 2008. Beginning in June 2005, we may force the exercise of these warrants if the average closing market price of our common stock during any 20 consecutive trading days is greater than $15.78 per share.

7.     Recently Issued Accounting Standards

     In January 2003, the Financial Accounting Standards Board (FASB) issued Interpretation 46, “Consolidation of Variable Interest Entities, an Interpretation of Accounting Research Bulletin No. 51,” (FIN 46). FIN 46 requires the consolidation of entities in which an enterprise absorbs a majority of another entity’s expected losses, receives a majority of the entity’s expected residual returns, or both, as a result of ownership, contractual or other interests in the entity. Currently, entities are generally consolidated by an enterprise when it has a controlling financial interest through ownership of a majority voting interest in the entity. The consolidation requirements of FIN 46 apply to variable interest entities created after January 31, 2003. The consolidation requirements apply to older entities in the first fiscal year or interim period ending after December 15, 2003. VirRx, Inc., discussed in Note 5 above, is a variable interest entity with regard to which we are evaluating whether or not the adoption of FIN 46 will require consolidating VirRx, Inc. in our future financial statements. VirRx, Inc. is not consolidated in our financial statements as of September 30, 2003, and for the periods then ended. A consolidation of VirRx, Inc. into our

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financial statements would not have a material impact on the financial statements as presented. We have no relationships with any other variable interest entities that we believe would require consolidation of those entities under FIN 46.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

     The following discussion and analysis should be read in conjunction with our condensed consolidated financial statements and the related notes thereto included in this Quarterly Report on Form 10-Q. The discussion and analysis contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These forward-looking statements are based on our current expectations and entail various risks and uncertainties. Our actual results could differ materially from those projected in the forward-looking statements as a result of various factors, including those set forth below under “Risk Factors.”

Overview

     Introgen Therapeutics, Inc. was incorporated in Delaware on June 17, 1993. We are a leading developer of biopharmaceutical products using non-integrating gene agents designed to induce therapeutic protein expression for the treatment of cancer and other diseases. Our drug discovery and development programs have resulted in innovative approaches by which physicians may use genes to initiate therapeutic protein production. Genes provide instructions for the manufacture of proteins in a cell. In the Introgen approach, genes are used as the means of introducing into the target cancer cells the necessary amounts of normal cancer fighting proteins that act to overpower the cancer cell. Thus, rather than acting to repair or replace aberrant or missing genes and thereby creating a permanent, long-term change to the patient’s genome, our products work in a different manner by formulating genes to act as templates for the in vivo production of proteins that simulate pharmacologic agents. The resultant proteins engage disease-related molecular targets or receptors to produce a specific therapeutic effect. Our lead product candidate, ADVEXIN® therapy, combines the p53 gene with an adenoviral gene delivery system that we have developed and extensively tested. The p53 gene is one of the most potent members of a group of naturally occurring tumor suppressor genes, which act to kill cancer cells, arrest cancer cell growth and protect cells from becoming cancerous.

     We are conducting pivotal Phase 3 clinical trials of ADVEXIN therapy, both by itself and in combination with chemotherapy, in advanced squamous cell cancer of the head and neck. Pivotal Phase 3 clinical trials are efficacy trials, which are usually followed by the filing of an application with the United States Food and Drug Administration (FDA) to market the product being tested. Our earlier Phase 2 clinical trials of ADVEXIN therapy in squamous cell cancer of the head and neck demonstrated that treatment with ADVEXIN therapy provided a survival advantage to patients with recurrent head and neck cancer who were ineligible for surgery.

     ADVEXIN therapy for head and neck cancer is designated as an orphan drug under the Orphan Drug Act, which gives us seven years of marketing exclusivity for ADVEXIN therapy if approved by the FDA. ADVEXIN therapy is also designated as a Fast Track Drug Product by the FDA for its effect on prolonging survival and the time to loco-regional disease progression in patients with recurrent, unresectable squamous cell carcinoma of the head and neck. By designating ADVEXIN therapy as a Fast Track Drug Product, the FDA will take actions to expedite the evaluation and review of the application for approval of ADVEXIN therapy.

     We have completed a Phase 2 clinical trial of ADVEXIN therapy administered as a complement with radiation therapy in non-small cell lung cancer. Phase 2 trials are efficacy trials. This Phase 2 trial showed that approximately 60 percent of patients’ primary tumors regressed or disappeared after the combination therapy, as assessed by biopsies, bronchoscopy or CT scans three months after treatment. Moreover, ADVEXIN therapy administration did not appear to increase the side effects caused by radiation treatment. These data were published in the January 2003 issue of the journal Clinical Cancer Research. We are reviewing future development plans for this indication.

     We are conducting a Phase 2 clinical trial of ADVEXIN therapy combined with systemic chemotherapy for the treatment of breast cancer. Interim results of this trial were published in June 2003 at the annual meeting of the American Society of Clinical Oncology. These results indicated that in patients with locally advanced breast cancer, ADVEXIN therapy can be safely combined with a two-drug standard chemotherapy regimen and that 90 percent of the patients had objective responses to the therapy.

     We are conducting a Phase 1-2 clinical trial of ADVEXIN therapy for the treatment of advanced unresectable squamous cell esophageal cancer. The study protocol was developed and is sponsored by investigators at Chiba

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University in Japan. Preliminary results from this trial indicate ADVEXIN therapy can be safely administered and that a positive biological effect resulted from the expression of the p53 protein. These results were published in June 2003 at the meeting of the American Society of Clinical Oncology. Of the first eight patients evaluated to date, one patient was observed to have minor tumor regression following ADVEXIN therapy injections.

     We are conducting Phase 1 clinical trials, or safety trials, of ADVEXIN therapy in other types of cancer. In a Phase 1 trial for the treatment of bronchoalveolar cancer, a form of non-small cell lung cancer, in which ADVEXIN therapy is administered directly into the airway leading to the diseased lung, we noted the therapy was well-tolerated in all 26 patients treated, that there was an improved ability to breathe in 20 percent of the patients who were able to be evaluated and that the disease stabilized and did not continue to grow in a majority of those patients. This trial was conducted under our Cooperative Research and Development Agreement with the National Cancer Institute (NCI).

     We and the NCI will conduct a Phase 1-2 clinical trial in which ADVEXIN therapy will be administered in the form of an oral rinse or mouthwash. This trial will be the first to investigate the cancer prevention effect of ADVEXIN therapy on oral lesions that have a high risk of developing into cancer. Currently, there are no such cancer prevention treatments approved by the FDA.

     As a supplement to our gene-induced therapeutic protein programs, we are developing INGN 225 using ADVEXIN therapy to create a highly specific therapeutic cancer vaccine that stimulates a patient’s particular immune cells known as dendritic cells. Recently published research in Current Opinion in Drug Discovery & Development concluded that ADVEXIN therapy can be used with a patient’s isolated dendritic cells as an antigen delivery and immune enhancing therapeutic strategy. Preclinical testing has shown that the immune system can recognize and kill tumors after treatment with ADVEXIN therapy stimulated dendritic cells. We believe ADVEXIN therapy applied in this manner could have broad utility to suppress cancer progression in patients with solid cancers. We are currently enrolling and treating patients with small-cell lung cancer in a Phase 1 clinical trial using INGN 225 after treatment with standard chemotherapy.

     To date, clinical investigators at clinical sites in North America, Europe and Japan have treated hundreds of patients with ADVEXIN therapy, establishing a large safety database. We hold the worldwide rights for pre-clinical and clinical development, manufacturing, marketing and commercialization of ADVEXIN therapy.

     In addition to our ADVEXIN therapy development programs, we are developing other gene-induced therapeutic protein agents that we believe may be effective in treating certain cancers. These additional therapeutic protein agents include those based on several genes, including the mda-7, FUS-1 and BAK genes, as well as additional vector technologies for delivering the gene-based products efficiently into target cells.

     Our INGN 241 product candidate, which combines the mda-7 gene with our adenoviral vector system, is undergoing safety and efficacy testing in a Phase 1-2 clinical trial, with one of the objectives also being to determine if this technology displays anti-tumor activity. This trial has demonstrated that in patients with various solid tumors, INGN 241 is well tolerated, produces the desired pharmacologic protein that is in turn biologically active, displays minimal toxicity and can lead to tumor regression. Preclinical studies have demonstrated that INGN 241 works to kill tumor cells directly and simultaneously stimulates the immune system, known as cytokine activity, to kill metastatic tumor cells through multiple mechanisms in a variety of cancers. These studies have shown that the mda-7 protein produced by INGN 241 may play an important role in controlling the growth of tumors, which resulted in the designation of mda-7 as interleukin-24, or IL-24. Preclinical studies also suggest INGN 241 can be effectively combined with radiation therapy and may be useful in enhancing the effects of such therapy. The results of another study recently published in the Journal of Thoracic and Cardiovascular Surgery indicate INGN 241 rapidly causes programmed cell death in lung cancer cells containing either normal or mutated p53, indicating that INGN 241 works in a different and possibly complementary manner to ADVEXIN therapy. This study further showed that INGN 241 kills cancer cells in a manner different from common chemotherapeutics, which could be an advantage in developing therapies to treat cancer patients whose tumors are resistant to chemotherapeutics.

     Preclinical studies have shown that delivery of the FUS-1 gene, which we exclusively license from The University of Texas M. D. Anderson Cancer Center, using either adenoviral or non-viral gene transfer, significantly inhibits the growth of tumors and greatly reduces the metastatic spread of lung cancer in animals. A non-viral

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delivery system licensed from the NCI has been formulated incorporating FUS-1 and is called INGN 401. A Phase 1 clinical trial is ongoing for INGN 401 in patients with advanced non-small cell lung cancer who have previously been treated with chemotherapy.

     We are investigating other vector technologies for delivering gene-based products into targeted cells. Through our strategic collaboration with VirRx, Inc., we are developing INGN 007, a replication-competent viral therapy that over-expresses an adenoviral gene and thereby causes rapid disruption of tumor cells in which the adenovirus replicates. Preclinical testing indicates that INGN 007 can eradicate human tumors in animal models. We anticipate pursuing clinical confirmation of this therapeutic candidate. We are also evaluating whether this replicating viral construct could form the basis of a self-amplifying gene delivery system, which could complement our existing replication-disabled, adenoviral gene delivery system in selected therapeutic scenarios.

     We believe our research and development expertise gained from our gene-induced protein therapies for cancer is also applicable to other diseases that, like cancer, result from cellular dysfunction and uncontrolled cell growth. As a result, we are conducting research in collaboration with medical institutions to understand the safety and effectiveness of our gene-induced protein therapy product candidates in the treatment of diseases such as rheumatoid arthritis. In addition, we have developed a variety of technologies, which we refer to as enabling technologies, for administering gene-based products to patients and enhancing the effects of these products. We also have specialized manufacturing expertise and a manufacturing facility to support our continued product development and commercialization efforts.

     As a supplement to our gene-induced therapeutic protein programs, we are evaluating the development of mebendazole, our first small molecule product candidate, which we refer to as INGN 601. The use of the mebendazole compound is approved by the FDA for the oral treatment of parasitic diseases. Pre-clinical studies suggest that mebendazole may also be an effective treatment of cancer. The results of pre-clinical studies involving mebendazole and lung cancer are published in the January 2003 edition of Molecular Cancer Therapeutics. We are working with The University of Texas M. D. Anderson Cancer Center to further evaluate development of this molecule as a cancer treatment.

     We place substantial emphasis on developing and maintaining a strong intellectual property program. We own or exclusively control numerous patents and pending patent applications in the United States and elsewhere that cover ADVEXIN therapy and INGN 241 (mda-7) therapy in particular, adenoviral p53 and adenoviral mda-7 in general, clinical applications of adenoviral and other forms of p53 and mda-7, and adenoviral production. Certain of our patents are licensed from The University of Texas System, Columbia University and Aventis Pharmaceuticals, Inc. The patents directed to clinical applications of p53 broadly cover the use of p53 in combination with standard chemotherapy and clinical therapy with adenoviral p53 in general. Our adenoviral production patent position is of particular potential commercial importance in that it covers most methods currently in use by us and others for commercial scale adenoviral production and purification processes. We have recently been successful in having certain European patents held by our competitors revoked by the European Patent Office, subject to appeal by the patent holders. In addition to our p53 and mda-7 intellectual property position, we also own or have exclusively licensed rights in a number of other patents and applications directed to the clinical application of various other tumor suppressor genes.

     We own and operate a manufacturing facility that we believe complies with the FDA’s current Good Manufacturing Practices requirements, commonly known as CGMP requirements. We have produced ADVEXIN therapy in this facility for use in our Phase 1, 2 and 3 clinical trials. The design of the facility and the processes operated in the facility have been reviewed with the FDA. Our work to validate our manufacturing processes in accordance with FDA regulations is ongoing. We plan to use this facility for our market launch of ADVEXIN therapy. We have produced over 20 batches of ADVEXIN therapy clinical material, including all clinical material used in our Phase 2 and Phase 3 clinical trials. In addition, we have entered into agreements with third parties under which we have provided process development and manufacturing services related to products they are developing. We have also produced INGN 241 in a separate facility for use in our Phase 1-2 clinical trial.

     Since our inception in 1993, we have used our resources primarily to conduct research and development activities for ADVEXIN therapy and, to a lesser extent, for other product candidates. At September 30, 2003, we had an accumulated deficit of approximately $87.6 million. We anticipate that we will incur losses in the future that

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may be greater than losses incurred in prior periods. At September 30, 2003, we had cash and cash equivalents of $22.6 million. During the nine months ended September 30, 2003, we used $10.5 million of cash for operating activities. Our cash usage rate could increase in future periods as we continue our ADVEXIN therapy clinical trials, prepare regulatory documentation for product application submissions to the FDA and conduct our research and development of various other technologies. Currently, we earn revenue from federal research grants, contract services and process development activities, the lease of a portion of our facilities to M. D. Anderson Cancer Center and interest income on cash placed in short-term, investment grade securities. We may raise additional funds through public or private equity offerings, debt financings or additional corporate collaboration and licensing arrangements. We do not know whether such additional financing will be available when needed, or on terms favorable to us or our stockholders.

     In June 2003, we sold 2.0 million shares of our common stock for an aggregate purchase price of $11.5 million to selected institutional investors through a private placement pursuant to Regulation D promulgated under the Securities Act of 1933, as amended. Our net proceeds from this transaction, after related fees and expenses, were $10.8 million. In connection with this sale, we issued warrants to purchase 400,000 shares of our common stock at $7.89 per share. These warrants are exercisable at any time by the warrant holders through June 2008. Beginning in June 2005, we may force the exercise of these warrants if the average closing market price of our common stock during any 20 consecutive trading days is greater than $15.78 per share. The shares of common stock issued and issuable upon the exercise of the warrants issued in this transaction have been registered on a registration statement on Form S-3, effective August 7, 2003 (Commission File No. 333-107028).

Summary of Significant Accounting Policies

     Use of Estimates. The preparation of financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

     Cash and Cash Equivalents. Our cash and cash equivalents include investments in short-term, investment grade securities, which currently consist primarily of United States federal government obligations. These investments are classified as held-to-maturity and are carried at amortized cost. At any point in time, amortized costs may be greater or less than fair value. If investments are sold prior to maturity, we could incur a realized gain or loss based on the fair market value of the investments at the date of sale. We could incur future losses on investments if the investment issuer becomes impaired or the investment is downgraded.

     Research and Development Costs. In conducting our clinical trials of ADVEXIN therapy and other product candidates, we procure services from numerous third-party vendors. The cost of these services constitutes a significant portion of the cost of these trials and of our research and development expenses in general. These vendors do not necessarily provide us billings for their services on a regular basis and, accordingly, are often not a timely source of information to determine the costs we have incurred relative to their services for any given accounting period. As a result, we make significant accounting estimates as to the amount of costs we have incurred relative to these vendors in each accounting period. These estimates are based on numerous factors, including, among others, costs set forth in our contracts with these vendors, the period of time over which the vendor will render the services and the rate of enrollment of patients in our clinical trials. Using these estimates, we record expenses and accrued liabilities in each accounting period that we believe fairly represent our obligations to these vendors. Actual results could differ from these estimates, resulting in increases or decreases in the amount of expense recorded and the related accrual.

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Results of Operations

Comparison of the Quarters Ended September 30, 2003 and September 30, 2002

Revenues

     Contract Services, Grant and Other Revenue. We earn contract services revenues from third parties under agreements to provide manufacturing process development services and to produce products for them. We earn contract research services revenue from Aventis Pharmaceuticals Products, Inc., one of our stockholders, under an agreement through which Aventis provides funding for the conduct of a Phase 2 clinical trial of ADVEXIN therapy in breast cancer. We earn grant revenue under research grants from U.S. Government agencies. Total contract services, grant and other revenue was $9,000 for the quarter ended September 30, 2003, compared to $453,000 for the quarter ended September 30, 2002, a decrease of 98%. This decrease was primarily due to (1) a decline in the level of our contract manufacturing activity due to the completion of work under services agreements with certain third parties subsequent to September 30, 2002, which was not replaced with new contract manufacturing work due to our focus during 2003 on the preparation of regulatory filings for ADVEXIN therapy and development of our other product candidates, (2) a decrease in contract services revenue earned from Aventis as the initial portion of the Phase 2 clinical trial of ADVEXIN therapy in breast cancer approached completion and (3) a decrease in grant revenue as the work under certain existing grants approached completion.

Costs and Expenses

     Research and Development. Research and development expenses, excluding compensation related to the issuance of stock options of $49,000 for the quarter ended September 30, 2003 and $98,000 for the quarter ended September 30, 2002, were $3.5 million for the quarter ended September 30, 2003, compared to $4.5 million for the quarter ended September 31, 2002, a decrease of 22%. This decrease was primarily due to cost control programs implemented during 2003 that reduced the rate at which we used cash for operations.

     General and Administrative. General and administrative expenses, excluding compensation related to the issuance of stock options of $120,000 for the quarter ended September 30, 2003 and $228,000 for the quarter ended September 30, 2002, were $1.3 million for the quarter ended September 30, 2003, compared to $1.5 million for the quarter ended September 30, 2002, a decrease of 13%. This decrease was primarily due to cost control programs implemented during 2003 that reduced the rate at which we used cash for operations.

     Compensation Related to the Issuance of Stock Options. Compensation related to the issuance of stock options was $169,000 for the quarter ended September 30, 2003, compared with $326,000 for the quarter ended September 30, 2002, a decrease of 48%. This decrease was due to deferred compensation related to certain options becoming fully amortized in quarters subsequent to September 30, 2002. The amount of compensation expense to be recorded in future periods may increase if additional options are issued at a price below the market price of common stock at the date of grant or are issued to individuals or entities other than employees or directors and may decrease if unvested options for which deferred compensation has been recorded are subsequently forfeited or as previously recorded deferred compensation becomes fully amortized.

Interest Income, Interest Expenses and Other Income

     Interest income was $402,000 for the quarter ended September 30, 2003, compared to $136,000 for the quarter ended September 30, 2002, an increase of 196%. Included in the 2003 amount is $350,000 we received from the settlement of litigation related to a decline in the market value of certain commercial paper we held as an investment during the quarter ended March 31, 2001. Excluding the amount from this settlement, interest income for the quarter ended September 30, 2003, was $52,000, which decreased 62% from the amount for the quarter ended September 30, 2002, due to our lower average cash and cash equivalents balances during 2003 and declining interest rates.

     Interest expense was $153,000 for the quarter ended September 30, 2003, compared with $181,000 for the quarter ended September 30, 2002, a decrease of 15%. This decrease was due to lower principal amounts upon which interest was incurred in 2003 compared to 2002 as a result of continuing debt service payments on notes payable and capital lease obligations.

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     Other income was $292,000 for the quarter ended September 30, 2003, compared to $261,000 for the quarter ended September 30, 2002, an increase of 12%. This increase was due to (1) higher rent and expense reimbursements in 2003 compared to 2002 from tenants to whom we sublease space in our facility and (2) proceeds from the sale of certain equipment in the 2003 period, where there were no such sales in the 2002 period.

Comparison of the Nine Months Ended September 30, 2003 and September 30, 2002

Revenues

     Contract Services, Grant and Other Revenue. Contract services, grant and other revenue was $302,000 for the nine months ended September 30, 2003, compared to $1.0 million for the nine months ended September 30, 2002, a decrease of 70%. This decrease was primarily due to a decline in the level of our contract manufacturing activity due to the completion of work under services agreements with certain third parties subsequent to September 30, 2002 that was not replaced with new contract manufacturing activity due to our focus during 2003 on the preparation of regulatory filings for ADVEXIN therapy and the continued development of our other product candidates.

Costs and Expenses

     Research and Development. Research and development expenses, excluding compensation related to the issuance of stock options of $171,000 in 2003 and $313,000 in 2002, were $10.7 million for the nine months ended September 30, 2003, compared to $16.8 million for the nine months ended September 30, 2002, a decrease of 36%. This decrease was primarily due to cost control programs implemented during 2003 that reduced the rate at which we used cash for operations.

     General and Administrative. General and administrative expenses, excluding compensation related to the issuance of stock options of $1.0 million in 2003 and $754,000 in 2002, were $3.6 million for the nine months ended September 30, 2003, compared to $4.4 million for the nine months ended September 30, 2002, a decrease of 18%. This decrease was primarily due to cost control programs implemented during 2003 that reduced the rate at which we used cash for operations.

     Compensation Related to the Issuance of Stock Options. Compensation related to the issuance of stock options was $1.2 million for the nine months ended September 30, 2003, compared with $1.1 million for the nine months ended September 30, 2002, an increase of 9%. This increase was due to stock options granted in June 2003 to (1) certain members of our Board of Directors for which some of the options have exercise prices below the market value of our common stock at the date of grant and were fully vested upon issuance, and (2) our corporate secretary, who is not a director or employee and for whom options grants are subject to fair value accounting. This increase was offset by a lower expense related to stock options granted in previous periods as deferred compensation related to those options became fully amortized. The amount of compensation expense to be recorded in future periods may increase if additional options are issued at a price below the market price of common stock at the date of grant or are issued to individuals or entities other than employees or directors and may decrease if unvested options for which deferred compensation has been recorded are subsequently forfeited or as previously recorded deferred compensation becomes fully amortized.

Interest Income, Interest Expense and Other Income

     Interest income was $938,000 for the nine months ended September 30, 2003, compared with $493,000 for the nine months ended September 30, 2002, an increase of 90%. Included in the 2003 amount is $775,000 we received from the settlement of litigation related to a decline in the market value of certain commercial paper we held as an investment during the quarter ended March 31, 2001. Excluding the amount from this settlement, interest income for the nine months ended September 30, 2003, was $163,000, which decreased 67% compared to the amount for the nine months ended September 30, 2002, due to our lower average cash and cash equivalents balances during 2003 and declining interest rates.

     Interest expense was $483,000 for the nine months ended September 30, 2003, compared with $604,000 for the nine months ended September 30, 2002, a decrease of 20%. This decrease was a result of lower principal amounts

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upon which interest was incurred in 2003 compared to 2002 as a result of continuing debt service payments on notes payable and capital lease obligations.

     Other income was $794,000 for the nine months ended September 30, 2003, compared to $911,000 for the nine months ended September 30, 2002, a decrease of 13%. This decrease was due primarily to other income for the 2002 period including $84,000 we received from the settlement of intellectual property related litigation.

Liquidity and Capital Resources

     We have incurred annual operating losses since our inception, and at September 30, 2003, we had an accumulated deficit of $87.6 million. From inception through September 30, 2003, we have financed our operations using $49.7 million of collaborative research and development payments from Aventis, $32.2 million of net proceeds from our initial public offering in October 2000, $39.4 million of private equity sales to Aventis, $25.4 million of private equity sales, net of offering costs, to others (including $10.8 million from the private sale of our common stock in June 2003), $7.5 million of sales of ADVEXIN therapy product to Aventis for use in later-stage clinical trials, $9.2 million in mortgage financing from banks for our facilities, $4.3 million in leases from commercial leasing companies to acquire equipment pledged as collateral for those leases and $11.9 million from contract services, grants, interest and other income.

     At September 30, 2003, we had cash and cash equivalents of $22.6 million, compared with $23.5 million at December 31, 2002. This decrease was primarily a result of the use of $11.7 million of cash to fund our operations offset by the sale of 2.0 million shares of our common stock in June 2003 for net proceeds of $10.8 million. For at least the next two years, we expect to focus our activities primarily on conducting Phase 3 and other clinical trials, conducting data analysis, preparing regulatory documentation submissions to the FDA and conducting pre-marketing activities for ADVEXIN therapy. We also expect to continue our research and development of various other gene-based technologies. The majority of our expenditures over this two-year period will most likely relate to the clinical trials of ADVEXIN therapy and the preparation of regulatory filings for ADVEXIN therapy. These activities may increase the rate at which we use cash in the future as compared to the cash we used for operating activities during the nine months ended September 30, 2003. We believe our existing working capital can fund our operations for the next 15 to 18 months, although unforeseen events could shorten that time period. We are taking measures to reduce the amount of cash used in our operating activities. Our existing resources may not be sufficient to support the commercial introduction of any of our product candidates. We may raise additional funds through public or private equity offerings, debt financings or additional corporate collaboration and licensing arrangements. We do not know whether such additional financing will be available when needed, or on terms favorable to us or our stockholders.

     Net cash used in operating activities was $10.5 million for the nine months ended September 30, 2003, compared with $16.7 million for the nine months ended September 30, 2002. In general, this decrease was primarily due to cost control programs implemented during 2003 that reduced the rate at which we used cash for operations. Specifically, the decrease in cash used was primarily the result of a lower net loss in 2003 compared to 2002, after considering adjustments for depreciation and compensation related to the issuance of stock options, further affected by (1) a larger decrease in other assets in 2003 compared to 2002 primarily due to an increased use of previously prepaid expenses to fund operations, (2) a smaller increase in accounts payable in 2003 compared to 2002 as a result of cost control programs implemented in 2003 resulting in a lower level of obligations to vendors and services providers, and (3) a smaller increase in deferred revenue in 2003 compared to 2002 due to funding received prior to June 30, 2002, for contract manufacturing process development and contract research services being earned subsequent to June 30, 2002, and not being replaced by additional funding for similar services.

     Net cash used in investing activities was $148,000 for the nine months ended September 30, 2003, compared to $10.6 million for the nine months ended September 30, 2002. The absence of activity related to short-term investments during the nine months ended September 30, 2003, as compared to the nine months ended September 30, 2002 was due to our not having any short-term investments during the nine months ended September 30, 2003. The amount of purchases of property and equipment during the nine months ended September 30, 2003, compared to the nine months ended September 30, 2002, was relatively unchanged as our need for additional property and equipment did not vary significantly between the periods. While we have no obligations at this time to purchase significant amounts of additional property or equipment, our needs may change. It may be necessary for us to

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purchase larger amounts of property and equipment to support our clinical programs and other research, development and manufacturing activities. We may need to obtain debt or lease financing to facilitate such purchases. If that financing is not available, we may need to use our existing resources to fund those purchases, which could result in a reduction in the cash and cash equivalents available to fund operating activities.

     Net cash provided by financing activities was $9.8 million for the nine months ended September 30, 2003, compared to net cash used in financing activities of $1.1 million for the nine months ended September 30, 2002. The 2003 amount includes $10.8 million of net proceeds from the sale of 2.0 million shares of our common stock in June 2003. Excluding the proceeds from that sale of common stock, the remaining use of $971,000 for financing activities in 2003 is lower than the comparable amount for 2002 due to the receipt of proceeds under a lease line of credit during 2003 for which there was no similar activity in 2002, offset by higher principal payments on notes payable and capital leases as those obligations continue to amortize.

     We have an agreement with VirRx, Inc. (VirRx) to purchase $150,000 of VirRx Series A Preferred Stock on the first day of each quarter through January 1, 2006. We purchased $450,000 of this stock for cash during the nine months ended September 30, 2003. We record these purchases as research and development expense. VirRx is required to use the proceeds from these stock sales in accordance with the terms of a collaboration and license agreement between VirRx and us for the development of VirRx’s technologies. We may unilaterally terminate this collaboration and license agreement with 90 days prior notice, which would also terminate our requirement to make any additional stock purchases. For additional discussion of our agreements with VirRx, see Note 6 to our consolidated financial statements included in our Form 10-K for the year ended December 31, 2002, filed with the Securities and Exchange Commission on March 31, 2003.

     We have fixed debt service and lease payment obligations under notes payable and capital leases for which the liability is reflected on our balance sheet. We used the proceeds from these notes payable and leases to finance facilities and equipment. Aggregate future payments due under these obligations are as follows (in thousands):

     We have a fixed rent obligation under a ground lease for the land on which we built our facilities. Since this is an operating lease, there is no liability reflected on our balance sheet for this item, which is in accordance with generally accepted accounting principles. We make total annual rent payments of approximately $144,000 under this lease that will continue until the expiration of the initial term of this lease in September 2026. Future annual rental payments due under all operating leases are as follows, in thousands:

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     In the normal course of business, we enter into various long-term agreements with vendors to provide services to us. Some of these agreements require up-front payment prior to services being rendered, some require periodic monthly payments and some provide for the vendor to bill us for their services as they are rendered. In substantially all cases, we may cancel these agreements at any time with minimal or no penalty and pay the vendor only for services actually rendered. Regardless of the timing of the payments under these agreements, we record the expenses incurred in the periods in which the services are rendered.

     We pay consulting fees of approximately $175,000 per annum to EJ Financial Enterprises, Inc., a company owned by the Chairman of our Board of Directors and that formerly employed one of our directors. EJ Financial Enterprises, Inc. provides us guidance on strategic product development, business development and marketing activities. We are obligated to continue paying this fee until we terminate the services of that company at our option.

     We have a consulting agreement with Jack A. Roth, M.D., Chairman of the Department of Thoracic Surgery and Director of the Keck Center for Gene Therapy at The University of Texas M. D. Anderson Cancer Center. Dr. Roth is the primary inventor of the technology upon which our ADVEXIN therapy is based and numerous other technologies we utilize. We licensed Dr. Roth’s inventions from M. D. Anderson Cancer Center. Dr. Roth is our Chief Medical Advisor and chairman of our scientific advisory board. His duties involve the regular interaction and consultation with our scientists and others on our behalf. As compensation for his services and responsibilities, this consulting agreement provides for payments to Dr. Roth of $200,000 per annum through the end of its term on September 30, 2009, with such future payments subject to adjustment for inflation. We may terminate this agreement at our option upon one year’s advance notice. If we had terminated this agreement as of September 30, 2003, we would have been obligated to make final payments totaling $200,000. Dr. Roth is one of our stockholders.

Risk Factors

     We may encounter delays or difficulties in clinical trials for our product candidates, which may delay or preclude regulatory approval of some or all of our product candidates.

     In order to commercialize our product candidates, we must obtain certain regulatory approvals. Satisfaction of regulatory requirements typically takes many years, and involves compliance with requirements covering research and development, testing, manufacturing, quality control, labeling and promotion of drugs for human use. To obtain regulatory approvals, we must, among other requirements, complete clinical trials demonstrating that our product candidates are safe and effective for a particular cancer type or other disease.

     We have completed two Phase 2 clinical trials and are conducting two Phase 3 clinical trials of our lead product candidate, ADVEXIN® therapy, for the treatment of head and neck cancer, have completed a Phase 2 clinical trial of ADVEXIN therapy for the treatment of non-small cell lung cancer, are conducting a Phase 2 clinical trial of ADVEXIN therapy for the treatment of breast cancer and either have conducted or are conducting several Phase 1 and Phase 2 clinical trials of ADVEXIN therapy for other cancer types. Current or future clinical trials may demonstrate that ADVEXIN therapy is neither safe nor effective.

     While we are conducting a Phase 1-2 clinical trial of INGN 241, a product candidate based on the mda-7 gene, our most significant clinical trial activity and experience has been with ADVEXIN therapy. We will need to continue conducting significant research and animal testing, referred to as pre-clinical testing, to support performing clinical trials for our other product candidates. It will take us many years to complete pre-clinical testing and clinical trials, and failure could occur at any stage of testing. Current or future clinical trials may demonstrate that INGN 241 or our other product candidates are neither safe nor effective.

     Any delays or difficulties we encounter in our pre-clinical research and clinical trials, in particular the Phase 3 clinical trials of ADVEXIN therapy for the treatment of head and neck cancer, may delay or preclude regulatory approval. Our product development costs will increase if we experience delays in testing or regulatory approvals or if we need to perform more or larger clinical trials than planned. Any delay or preclusion could also delay or

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preclude the commercialization of ADVEXIN therapy or any other product candidates. In addition, we or the FDA might delay or halt any of our clinical trials of a product candidate at any time for various reasons, including:

	•		the product candidate is less effective and/or more toxic than current therapies;
	•		the presence of unforeseen adverse side effects of a product candidate, including its delivery system;
	•		a longer than expected time required to determine whether or not a product candidate is effective;
	•		the death of patients during a clinical trial, even though the product candidate may not have caused those deaths;
	•		the failure to enroll a sufficient number of patients in our clinical trials;
	•		the inability to produce sufficient quantities of a product candidate to complete the trials; or
	•		the inability to commit the necessary resources to fund the clinical trials.

     Despite the FDA’s designation of ADVEXIN therapy as a Fast Track Drug Product, we may encounter delays in the regulatory approval process due to additional information requirements from the FDA, unintentional omissions in our biologics license application for ADVEXIN therapy, or other delays in the FDA’s review process. We may encounter delays or rejections in the regulatory approval process because of additional government regulation from future legislation or administrative action or changes in FDA policy during the period of product development, clinical trials and FDA regulatory review. Failure to comply with applicable FDA or other applicable regulatory requirements may result in criminal prosecution, civil penalties, recall or seizure of products, total or partial suspension of production or injunction, as well as other regulatory action against our product candidates or us.

     Outside the United States, our ability to market a product is contingent upon receiving clearances from the appropriate regulatory authorities. This foreign regulatory approval process includes all of the risks associated with FDA clearance described above.

     We have a history of operating losses and expect to incur significant additional operating losses.

     We have generated operating losses since we began operations in June 1993. As of September 30, 2003, we had an accumulated deficit of approximately $87.6 million. We expect to incur substantial additional operating expenses and losses over the next several years as our research, development, pre-clinical testing and clinical trial activities increase. We have no products that have generated any commercial revenue. Presently, we earn minimal revenue from contract services activities, grants, interest income and rent from the lease of a portion of our facilities to M. D. Anderson Cancer Center. We do not expect to generate revenues from the commercial sale of products in the near future, and we may never generate revenues from the commercial sale of products.

     If we continue to incur operating losses for a period longer than we anticipate and fail to obtain the capital necessary to fund our operations, we will be unable to advance our development program and complete our clinical trials.

     Developing a new drug and conducting clinical trials for multiple disease indications is expensive. We expect that we will fund our operations over the approximately the next 15 to 18 months with our current working capital, which we accumulated primarily from the net proceeds from our initial public offering in October 2000, the sale of Series A Non-Voting Convertible Preferred Stock to Aventis in June 2001, net proceeds from the sale of common stock and warrants to purchase common stock in a private placement to selected institutional investors in June 2003, income from contract services and research grants, debt financing of equipment acquisitions, the lease of a portion of our facilities to M. D. Anderson Cancer Center and interest on invested funds. We may need to raise additional capital sooner, however, due to a number of factors, including:

•

an acceleration of the number, size or complexity of our clinical trials;

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	•		slower than expected progress in developing ADVEXIN therapy, INGN 241 or other product candidates;
	•		higher than expected costs to obtain regulatory approvals;
	•		higher than expected costs to pursue our intellectual property strategy;
	•		higher than expected costs to further develop our manufacturing capability; and
	•		higher than expected costs to develop our sales and marketing capability.

     We do not know whether additional financing will be available when needed, or on terms favorable to us or our stockholders. We may need to raise any necessary funds through public or private equity offerings, debt financings or additional corporate collaboration and licensing arrangements. To the extent we raise additional capital by issuing equity securities, our stockholders will experience dilution. If we raise funds through debt financings, we may become subject to restrictive covenants. To the extent that we raise additional funds through collaboration and licensing arrangements, we may be required to relinquish some rights to our technologies or product candidates, or grant licenses on terms that are not favorable to us.

     If we cannot maintain our corporate and academic arrangements and enter into new arrangements, product development could be delayed.

     Our strategy for the research, development and commercialization of our product candidates may require us to enter into contractual arrangements with corporate collaborators, academic institutions and others. We have entered into sponsored research and/or collaborative arrangements with several entities, including M. D. Anderson Cancer Center, the National Cancer Institute, Chiba University in Japan, VirRx and Corixa Corporation, as well as numerous other institutions that conduct clinical trials work for us. Our success depends upon our collaborative partners performing their responsibilities under these arrangements. We cannot control the amount and timing of resources our collaborative partners devote to our research and testing programs or product candidates, which can vary because of factors unrelated to such programs or product candidates. These relationships may in some cases be terminated at the discretion of our collaborative partners with only limited notice to us. We may not be able to maintain our existing arrangements, enter into new arrangements or negotiate current or new arrangements on acceptable terms, if at all. Some of our collaborative partners may also be researching competing technologies independently from us to treat the diseases targeted by our collaborative programs.

     If we are not able to create effective collaborative marketing relationships, we may be unable to market ADVEXIN therapy successfully or in a cost-effective manner.

     To effectively market our products, we will need to develop sales, marketing and distribution capabilities. In order to develop or otherwise obtain these capabilities, we may have to enter into marketing, distribution or other similar arrangements with third parties in order to successfully sell, market and distribute our products. To the extent that we enter into any such arrangements with third parties, our product revenues are likely to be lower than if we directly marketed and sold our products, and any revenues we receive will depend upon the efforts of such third parties. We have no experience in marketing or selling pharmaceutical products and we currently have no sales, marketing or distribution capability. We may be unable to develop sufficient sales, marketing and distribution capabilities to successfully commercialize our products.

     Serious unwanted and unexpected side effects attributable to gene therapy may result in governmental authorities imposing additional regulatory requirements or a negative public perception of our products.

     Serious unwanted and unexpected side effects attributable to treatment, which physicians classify as treatment-related adverse events, occurring in the field of gene therapy may result in greater governmental regulation and negative public perception of our product candidates, as well as potential regulatory delays relating to the testing or approval of our product candidates. In 2002, the FDA placed a clinical hold on gene therapy clinical trials using retroviral vectors to transduce hematopoietic stem cells after two participants in such a trial for the X-linked form of severe combined immune deficiency disease (X-SCID) being conducted in Europe developed what appeared to be a leukemia-like illness. This clinical hold requires a case-by-case review of the use of retroviral vectors in these

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European trials before consideration of the removal of this clinical hold for these trials. We do not use retroviral vectors in our ongoing clinical trials and are not developing products using the production process used in those clinical trials. We have received no communications from the FDA to indicate this clinical hold will affect our clinical trials, and we anticipate no future negative effects on our clinical trials from this event. No ongoing or active clinical study of any product candidate of ours has ever been placed on hold by the FDA. In accordance with our pharmacovigilance procedures, we monitor every patient in our clinical trials for safety and report all side effects to the FDA and the National Institutes of Health according to applicable regulations. We have witnessed no adverse effects in our clinical trials that even remotely resemble what occurred in the X-SCID trial. Due to the fundamental differences between retroviral vectors and the adenoviral vector employed in ADVEXIN therapy, we believe the likelihood of our encountering an event such as that experienced in the X-SCID trial is remote.

     The United States Senate has held hearings concerning the adequacy of regulatory oversight of gene therapy clinical trials, as well as the adequacy of research subject education and protection in clinical research in general, and to determine whether additional legislation is required to protect healthy volunteers and patients who participate in such clinical trials. The Recombinant DNA Advisory Committee, or RAC, which acts as an advisory body to the National Institutes of Health, or NIH, has expanded its public role in evaluating important public and ethical issues in gene therapy clinical trials. Implementation of any additional review and reporting procedures or other additional regulatory measures could increase the costs of or prolong our product development efforts or clinical trials.

     Following routine procedure, we report to the FDA and other regulatory agencies serious adverse events that we believe may be reasonably related to the treatments administered in our clinical trials. Such serious adverse events, whether treatment-related or not, could result in negative public perception of our treatments and require additional regulatory review or measures, which could increase the cost of or prolong our clinical trials.

     To date no governmental authority has approved any gene therapy product or gene-induced product for sale in the United States or internationally. The commercial success of our products will depend in part on public acceptance of the use of gene therapy products or gene-induced products, which are a new type of disease treatment for the prevention or treatment of human diseases. Public attitudes may be influenced by claims that gene therapy products or gene-induced products are unsafe, and these treatment methodologies may not gain the acceptance of the public or the medical community. Negative public reaction to gene therapy product or gene-induced products could also result in greater government regulation and stricter clinical trial oversight.

     If we fail to adequately protect our intellectual property rights, our competitors may be able to take advantage of our research and development efforts to develop competing drugs.

     Our commercial success will depend in part on obtaining patent protection for our products and other technologies and successfully defending these patents against third party challenges. Our patent position, like that of other biotechnology and pharmaceutical companies, is highly uncertain. One uncertainty is that the United States Patent and Trademark Office, or PTO, or the courts, may deny or significantly narrow claims made under patents or patent applications. This is particularly true for patent applications or patents that concern biotechnology and pharmaceutical technologies, such as ours, since the PTO and the courts often consider these technologies to involve unpredictable sciences. Another uncertainty is that any patents that may be issued or licensed to us may not provide any competitive advantage to us and they may be successfully challenged, invalidated or circumvented in the future. In addition, our competitors, many of which have substantial resources and have made significant investments in competing technologies, may seek to apply for and obtain patents that will prevent, limit or interfere with our ability to make, use and sell our potential products either in the United States or in international markets.

     Our ability to develop and protect a competitive position based on our biotechnological innovations, innovations involving genes, gene-induced therapeutic protein agents, viruses for delivering the genes to cells, formulations, gene therapy delivery systems that do not involve viruses, and the like, is particularly uncertain. Due to the unpredictability of the biotechnological sciences, the PTO, as well as patent offices in other jurisdictions, has often required that patent applications concerning biotechnology-related inventions be limited or narrowed substantially to cover only the specific innovations exemplified in the patent application, thereby limiting their scope of protection against competitive challenges. Similarly, courts have invalidated or significantly narrowed many key patents in the biotechnology industry. Thus, even if we are able to obtain patents that cover commercially significant innovations, our patents may not be upheld or our patents may be substantially narrowed.

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     Through our exclusive license from The University of Texas System for technology developed at M. D. Anderson Cancer Center, we have obtained and are currently seeking further patent protection for adenoviral p53, including ADVEXIN therapy, and its use in cancer therapy. Further, the PTO issued us a United States patent for our adenovirus production technology. We also control, through licensing arrangements, four issued United States patents for combination therapy involving the p53 gene and conventional chemotherapy or radiation, one issued United States patent covering the use of adenoviral p53 in cancer therapy, one issued United States patent covering adenoviral p53 as a product and an issued United States patent covering the core DNA of adenoviral p53. Our competitors may challenge the validity of one or more of our patents in the courts or through an administrative procedure known as an interference. The courts or the PTO may not uphold the validity of our patents, we may not prevail in such interference proceedings regarding our patents and none of our patents may give us a competitive advantage.

     We have been notified by the European Patent Office, or EPO, that Schering-Plough has filed an opposition against our European patent directed to combination therapy with p53 and conventional chemotherapy and/or radiation. An opposition is an administrative proceeding instituted by a third party and conducted by the EPO to determine whether a patent should be maintained or revoked in part or in whole, based on evidence brought forth by the party opposing the patent. The EPO held an initial oral proceeding on October 20, 2003 and determined that the patent should be maintained as amended. Schering-Plough will have an opportunity to appeal this decision. Resolution of such an appeal, if taken, will require that we expend time, effort and money. If Schering-Plough ultimately prevails in having our European patent revoked on appeal, then the scope of our protection for our product in Europe will be reduced. We would not expect, however, such a result to have a significant impact on our commercialization efforts in Europe.

     Third-party claims of infringement of intellectual property could require us to spend time and money to address the claims and could limit our intellectual property rights.

     The biotechnology and pharmaceutical industry has been characterized by extensive litigation regarding patents and other intellectual property rights, and companies have employed intellectual property litigation to gain a competitive advantage. We are aware of a number of issued patents and patent applications that relate to gene therapy, the treatment of cancer and the use of the p53 and other tumor suppressor genes. Schering-Plough Corporation, including its subsidiary Canji, Inc., controls various United States patent applications and a European patent and applications, some of which are directed to therapy using the p53 gene, and others to adenoviruses that contain the p53 gene, or adenoviral p53, and to methods for carrying out therapy using adenoviral p53. In addition, Canji controls an issued United States patent and its international counterparts, including a European patent, involving a method of treating mammalian cancer cells lacking normal p53 protein by introducing a p53 gene into the cancer cell.

     While we believe that our potential products do not infringe any valid claim of the Canji p53 patents, Canji or Schering-Plough could assert a claim against us. We may also become subject to infringement claims or litigation arising out of other patents and pending applications of our competitors, if they issue, or additional interference proceedings declared by the PTO to determine the priority of inventions. The defense and prosecution of intellectual property suits, PTO interference proceedings and related legal and administrative proceedings are costly and time-consuming to pursue, and their outcome is uncertain. Litigation may be necessary to enforce our issued patents, to protect our trade secrets and know-how or to determine the enforceability, scope and validity of the proprietary rights of others. An adverse determination in litigation or interference proceedings to which we may become a party could subject us to significant liabilities, require us to obtain licenses from third parties, or restrict or prevent us from selling our products in certain markets. Although patent and intellectual property disputes are often settled through licensing or similar arrangements, costs associated with such arrangements may be substantial and could include ongoing royalties. Furthermore, the necessary licenses may not be available to us on satisfactory terms, if at all. In particular, if we were found to infringe a valid claim of the Canji p53 issued United States patent, our business could be materially harmed.

     We are currently involved in opposing three European patents in proceedings before the EPO, in which we are seeking to have the EPO revoke three different European patents owned or controlled by Canji. These European patents relate to the use of a p53 gene, or the use of tumor suppressor genes, in the preparation of therapeutic

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products. In one opposition involving a European patent directed to the use of a tumor suppressor gene, the EPO revoked the European patent in its entirety. Canji has appealed this revocation. In the second opposition, involving a patent that is directed to therapeutic and other applications of the p53 gene and that is owned by Johns Hopkins and, we understand, controlled by Schering-Plough, the EPO recently revoked the patent in its entirety. The patent owner has appealed this decision. In a third case involving the use of a p53 gene, the European patent at issue was upheld following an initial hearing. A second hearing to determine whether this patent should be revoked will be upcoming. If we do not ultimately prevail in one or more of these oppositions, our competitors could seek to assert by means of litigation any patent surviving opposition against European commercial activities involving our potential products. If our competitors are successful in any such litigation, it could have a significant detrimental effect on our ability to commercialize our potential commercial products in Europe.

     Competition and technological change may make our product candidates and technologies less attractive or obsolete.

     We compete with pharmaceutical and biotechnology companies, including Canji, Inc. and Genvec, Inc., which are pursuing other forms of treatment for the diseases ADVEXIN therapy and our other product candidates target. We also may face competition from companies that may develop internally or acquire competing technology from universities and other research institutions. As these companies develop their technologies, they may develop competitive positions that may prevent or limit our product commercialization efforts.

     Some of our competitors are established companies with greater financial and other resources than ours. Other companies may succeed in developing products earlier than we do, obtaining FDA approval for products more rapidly than we do or developing products that are more effective than our product candidates. While we will seek to expand our technological capabilities to remain competitive, research and development by others may render our technology or product candidates obsolete or non-competitive or result in treatments or cures superior to any therapy developed by us.

     Even if we receive regulatory approval to market ADVEXIN therapy, INGN 241, INGN 225 or other product candidates, we may not be able to commercialize them profitably.

     Our profitability will depend on the market’s acceptance of ADVEXIN therapy, INGN 241, INGN 225 and our other product candidates. The commercial success of our product candidates will depend on whether:

	•		they are more effective than alternative treatments;
	•		their side effects are acceptable to patients and doctors;
	•		we produce and sell them at a profit; and
	•		we market ADVEXIN therapy, INGN 241, INGN 225 and other product candidates effectively.

     If we are unable to manufacture our products in sufficient quantities or obtain regulatory approvals for our manufacturing facility, or if our manufacturing process is found to infringe a valid patented process of another company, then we may be unable to meet demand for our products and lose potential revenues.

     The completion of our clinical trials and commercialization of our product candidates requires access to, or development of, facilities to manufacture a sufficient supply of our product candidates. We use a manufacturing facility in Houston, Texas, which we constructed and own, to manufacture ADVEXIN therapy, INGN 241 and other product candidates for currently planned clinical trials. This facility will be used for the initial commercial launch of ADVEXIN therapy. We have no experience manufacturing ADVEXIN therapy, INGN 241 or any other product candidates in the volumes that would be necessary to support commercial sales. If we are unable to manufacture our product candidates in clinical or, when necessary, commercial quantities, then we will need to rely on third-party manufacturers to produce our products for clinical and commercial purposes. These third-party manufacturers must receive FDA approval before they can produce clinical material or commercial product. Our products may be in competition with other products for access to these facilities and may be subject to delays in manufacture if third parties give other products greater priority than ours. In addition, we may not be able to enter into any necessary

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third-party manufacturing arrangements on acceptable terms. There are very few contract manufacturers who currently have the capability to produce ADVEXIN therapy, INGN 241 or our other product candidates, and the inability of any of these contract manufacturers to deliver our required quantities of product candidates timely and at commercially reasonable prices would negatively affect our operations.

     Before we can begin commercially manufacturing ADVEXIN therapy, INGN 241 or any other product candidate, we must obtain regulatory approval of our manufacturing facility and process. Manufacturing of our product candidates for clinical and commercial purposes must comply with CGMP and foreign regulatory requirements. The CGMP requirements govern quality control and documentation policies and procedures. In complying with CGMP and foreign regulatory requirements, we will be obligated to expend time, money and effort in production, record keeping and quality control to assure that the product meets applicable specifications and other requirements. We must also pass a pre-approval inspection prior to FDA approval.

     Our current manufacturing facilities have not yet been subject to an FDA or other regulatory inspection. Failure to pass a pre-approval inspection may significantly delay FDA approval of our products. If we fail to comply with these requirements, we would be subject to possible regulatory action and may be limited in the jurisdictions in which we are permitted to sell our products. Further, the FDA and foreign regulatory authorities have the authority to perform unannounced periodic inspections of our manufacturing facility to ensure compliance with CGMP and foreign regulatory requirements. Our facility in Houston, Texas is our only manufacturing facility. If this facility were to incur significant damage or destruction, then our ability to manufacture ADVEXIN therapy, INGN 241 or any other product candidates would be significantly hampered and we would incur delays in our pre-clinical testing, clinical trials and commercialization efforts.

     Canji controls a United States patent and the corresponding international applications, including a European counterpart, relating to the purification of viral or adenoviral compositions. While we believe that our manufacturing process does not infringe upon this patent, Canji could still assert a claim against us. We may also become subject to infringement claims or litigation if our manufacturing process infringes upon other patents. The defense and prosecution of intellectual property suits and related legal and administrative proceedings are costly and time-consuming to pursue, and their outcome is uncertain.

     We rely on only one supplier for some of our manufacturing materials. Any problems experienced by any such supplier could negatively affect our operations.

     We rely on third-party suppliers for some of the materials used in the manufacturing of ADVEXIN therapy, INGN 241 and our other product candidates. Some of these materials are available from only one supplier or vendor. Any significant problem that one of our sole source suppliers experiences could result in a delay or interruption in the supply of materials to us until that supplier cures the problem or until we locate an alternative source of supply. Any delay or interruption would likely lead to a delay or interruption in our manufacturing operations, which could negatively affect our operations.

     The CellCube^TM Module 100 bioreactor, which Corning (Acton, MA) manufactures, and Benzonase®, which EM Industries (Hawthorne, NY) manufactures, are currently available only from these suppliers. Any significant interruption in the supply of either of these items would require a material change in our manufacturing process. We maintain inventories of these items, but we do not have a supply agreement with either manufacturer.

     If product liability lawsuits are successfully brought against us, we may incur substantial damages and demand for the products may be reduced.

     The testing and marketing of medical products is subject to an inherent risk of product liability claims. Regardless of their merit or eventual outcome, product liability claims may result in:

	•		decreased demand for our product candidates;
	•		injury to our reputation and significant media attention;
	•		withdrawal of clinical trial volunteers;

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	•		substantial delay in FDA approval;
	•		costs of litigation; and
	•		substantial monetary awards to plaintiffs.

     We currently maintain product liability insurance with coverage of $5.0 million per occurrence with a $15.0 million annual aggregate limit. This coverage may not be sufficient to protect us fully against product liability claims. We intend to expand our product liability insurance coverage to include the sale of commercial products if we obtain marketing approval for any of our product candidates. Our inability to obtain sufficient product liability insurance at an acceptable cost to protect against product liability claims could prevent or limit the commercialization of our products.

     We use hazardous materials in our business, and any claims relating to improper handling, storage or disposal of these materials could harm our business.

     Our business involves the use of a broad range of hazardous chemicals and materials. Environmental laws impose stringent civil and criminal penalties for improper handling, disposal and storage of these materials. In addition, in the event of an improper or unauthorized release of, or exposure of individuals to, hazardous materials, we could be subject to civil damages due to personal injury or property damage caused by the release or exposure. A failure to comply with environmental laws could result in fines and the revocation of environmental permits, which could prevent us from conducting our business.

     Our stock price may fluctuate substantially.

     The market price for our common stock will be affected by a number of factors, including:

	•		the announcement of new products or services by us or our competitors;
	•		quarterly variations in our or our competitors’ results of operations;
	•		failure to achieve operating results projected by securities analysts;
	•		changes in earnings estimates or recommendations by securities analysts;
	•		developments in our industry; and
	•		general market conditions and other factors, including factors unrelated to our operating performance or the operating performance of our competitors.

     In addition, stock prices for many companies in the technology and emerging growth sectors have experienced wide fluctuations that have often been unrelated to the operating performance of such companies. Many factors may have a significant adverse effect on the market price of our common stock, including:

	•		results of our pre-clinical and clinical trials;
	•		announcement of technological innovations or new commercial products by us or our competitors;
	•		developments concerning proprietary rights, including patent and litigation matters;
	•		publicity regarding actual or potential results with respect to products under development by us or by our competitors;
	•		regulatory developments; and

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quarterly fluctuations in our revenues and other financial results.

     Any acquisition we might make may be costly and difficult to integrate, may divert management resources or dilute stockholder value.

     As part of our business strategy, we may acquire assets or businesses principally relating to or complementary to our current operations, and we have in the past evaluated and discussed such opportunities with interested parties. Any acquisitions that we undertake will be accompanied by the risks commonly encountered in business acquisitions. These risks include, among other things:

	•		potential exposure to unknown liabilities of acquired companies;
	•		the difficulty and expense of assimilating the operations and personnel of acquired businesses;
	•		diversion of management time and attention and other resources;
	•		loss of key employees and customers as a result of changes in management;
	•		the incurrence of amortization expenses; and
	•		possible dilution to our stockholders.

     In addition, geographic distances may make the integration of businesses more difficult. We may not be successful in overcoming these risks or any other problems encountered in connection with any acquisitions.

Item 3. Quantitative and Qualitative Disclosures about Market Risk.

     Our exposure to market risk for changes in interest rates relates primarily to our fixed rate long-term debt and short-term investments in investment grade securities, which consist primarily of federal and state government obligations, commercial paper and corporate bonds. Investments are classified as held-to-maturity and are carried at amortized costs. We do not hedge interest rate exposure or invest in derivative securities. Based on our investment balances at September 30, 2003, a hypothetical 100-basis point decrease in the interest rates we earn on those investments would decrease our interest income by approximately $226,000 per year and approximately $75,000 per quarter.

     At September 30, 2003, the fair value of our fixed-rate debt approximated its carrying value based upon discounted future cash flows using current market prices.

Item 4. Controls and Procedures.

     Evaluation of Disclosure Controls and Procedures. Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that our disclosure controls and procedures are effective to ensure that information we are required to disclose in reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms.

     Changes in Internal Control over Financial Reporting. There was no change in our internal control over financial reporting that occurred during the period covered by this Quarterly Report on Form 10-Q that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II
OTHER INFORMATION

Item 1. Legal Proceedings.

     We are involved from time to time in legal proceedings relating to claims arising out of our operations in the ordinary course of business, including actions relating to our intellectual property rights.

     We do not believe that the outcome of any present litigation, or all litigation in the aggregate, other than our opposition of three European patents controlled by Canji discussed under “Risk Factors,” will have a material effect on our business. You can read the discussion of our opposition of these patents under “Risk Factors.”

Item 2. Changes in Securities and Use of Proceeds.

     None.

Item 3. Defaults Upon Senior Securities.

     None.

Item 4. Submission of Matters to a Vote of Security Holders.

     None.

Item 5. Other Information.

     Pursuant to Section 10A(i)(2) of the Securities Exchange Act of 1934, as added by Section 202 of the Sarbanes-Oxley Act of 2002, we are responsible for disclosing the approval of non-audit services approved by the audit committee of our Board of Directors (the “Audit Committee”) to be performed by Ernst & Young LLP, our independent auditors. Non-audit services are defined as services other than those provided in connection with an audit or a review of our financial statements. Except as set forth below, the services approved by the Audit Committee are each considered by the Audit Committee to be audit-related services that are closely related to the financial audit process. Each of the services was pre-approved by the Audit Committee.

     The Audit Committee has also pre-approved additional engagements of Ernst & Young LLP for the non-audit services of preparation of state and federal tax returns.

Item 6. Exhibits and Reports on Form 8-K.

     (a)  Exhibits

     (b)  Reports on Form 8-K

     In connection with our earnings press release for the quarter ended June 30, 2003, we filed a Current Report on Form 8-K on August 12, 2003.

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SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

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EXHIBIT INDEX