Antigenics to Report Third Quarter 2008 Financial Results on November 5, 2008; Conference Call to Follow

New York – October 31, 2008 – Antigenics Inc. (NASDAQ: AGEN) will release its third quarter financial results before the market opens on November 5, 2008.

Antigenics executives will host a conference call at 11:00 a.m. Eastern Time that same day. To access the live call, dial 877.762.5772 (domestic) or 706.643.6986 (international); the access code is 69261414. The call will also be webcast and will be accessible from the company’s website at www.antigenics.com/webcast/. A replay will be available approximately two hours after the call through midnight Eastern Time on November 19, 2008. The replay number is 800.642.1687 (domestic) or 706.645.9291 (international), and the access code is 69261414. The replay will also be available on the company’s website approximately two hours after the live call.

Antigenics is a biotechnology company developing treatments for cancers and infectious diseases. For more information, please visit www.antigenics.com.