Antigenics To Webcast 2008 Annual Shareholders Meeting

Listen to the webcast of this event on June 4th, at 5:00 p.m. ET

NEW YORK — May 21, 2008 — Antigenics Inc. (NASDAQ: AGEN) invites investors and the general public to its 2008 Annual Shareholders Meeting at 5:00 p.m. ET on Wednesday, June 4. The meeting will be held at the Baruch College Newman Conference Center at 151 E. 25th Street, 7th floor, in New York City. Registration for attendees starts at 4:30 p.m. ET.

A live webcast will be accessible from the company’s website at www.antigenics.com/webcast/ and will be archived and available for replay approximately two hours after the meeting.

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