Exhibit 5.1
November 4, 2005
Introgen Therapeutics, Inc.
301 Congress Avenue, Suite 1850
Austin, Texas 78701
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| Re: | | Registration Statement on Form S-3 |
Ladies and Gentlemen:
We have acted as counsel to Introgen Therapeutics, Inc., a Delaware corporation (the “Company”), in connection with the registration of the offer and sale of 3,610,760 shares of the Company’s common stock, par value $0.001 per share (the “Common Stock”), pursuant to the registration statement on Form S-3 (File No. 333-107799), as amended, filed by the Company with the Securities and Exchange Commission (the “Commission”) on August 8, 2003 and declared effective by the Commission on August 25, 2003 (the “Registration Statement”).
The offering and sale of the Common Stock is being made pursuant to a Common Stock Purchase Agreement dated November 4, 2005, by and between the Company and Colgate-Palmolive Company (the “Purchase Agreement”).
We have examined copies of the Purchase Agreement, the Registration Statement, the prospectus included in the Registration Statement as of its effective date and the prospectus supplement to be filed by the Company with the Commission on or about November 4, 2005 (the “Prospectus Supplement”). We have also examined instruments, documents and records that we deemed relevant and necessary for the basis of our opinion hereinafter expressed.
In such examination, we have assumed (i) the authenticity of original documents and the genuineness of all signatures, (ii) the conformity to the originals of all documents submitted to us as copies and (iii) the truth, accuracy and completeness of the information, representations and warranties contained in the records, documents, instruments and certificates we have reviewed.
Based on and subject to the foregoing, we are of the opinion that:
The shares of Common Stock have been duly authorized by the Company and, when issued and delivered by the Company against payment therefor in accordance with the terms of the Purchase Agreement, will be validly issued, fully paid and nonassessable.
Introgen Therapeutics, Inc.
November 4, 2005
Page 2
We express no opinion as to the laws of any other jurisdiction other than the federal laws of the United States of America and the General Corporation Law of the State of Delaware.
We hereby consent to the filing of this opinion as an exhibit to a Current Report on Form 8-K, which is incorporated by reference into the Registration Statement, and to the use of our name under the caption “Legal Matters” in the Prospectus Supplement and elsewhere in the Registration Statement and the Prospectus Supplement.
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| | | Sincerely, |
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| | | /s/ Wilson Sonsini Goodrich & Rosati |
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| | | WILSON SONSINI GOODRICH & ROSATI |
| | | Professional Corporation |
