Introgen Therapeutics (INGNQ) S-8 Registration of securities for employees

Exhibit 23.1

Consent of Independent Auditors

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Introgen Therapeutics, Inc. 2000 Stock Option Plan of our report dated January 16, 2004, with respect to the consolidated financial statements of Introgen Therapeutics, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2003.

/s/ ERNST & YOUNG LLP

Austin, Texas
March 1, 2004