About Antigenics

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

Forward-Looking Statements

This press release contains forward-looking statements made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, including statements as to future economic performance, and plans and objectives of the Company. Forward-looking statements typically are identified by use of terms such as “may,” “will,” “should,” “plan,” “expect,” “intend,” “anticipate,” “estimate,” and similar words, although some forward-looking statements are expressed differently. These forward-looking statements are based on management’s current expectations and are subject to risks and uncertainties that could cause actual results to differ materially. These risks and uncertainties include, but are not limited to events or developments affecting the Company’s market performance, NASDAQ’s ability to exercise its discretion with respect to decisions regarding the Company’s listing, and the risk and uncertainties described under the heading “Risk Factors” in the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010, and in other filings that we may make with the Securities and Exchange Commission from time to time. Antigenics cautions investors not to place considerable reliance on the forward-looking statements contained in this press release. These statements speak only as of the date of this document, and Antigenics undertakes no obligation to update or revise the statements. All forward-looking statements are expressly qualified in their entirety by this cautionary statement. Antigenics’ business is subject to substantial risks and uncertainties, including those identified above. When evaluating Antigenics’ business and securities, investors should give careful consideration to these risks and uncertainties.

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