Exhibit 31.1
Certification Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as amended
I, Garo H. Armen, certify that:
| 1. | I have reviewed this Quarterly Report on Form 10-Q/A of Antigenics Inc.; and |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
| Date: November 10, 2008 | /S/ GARO H. ARMEN, PH.D. | |
| Garo H. Armen, Ph.D. | ||
| Chief Executive Officer |
