The Cancer Therapy Evaluation Program (CTEP) of the National Cancer Institute (NCI) approved a study of the Prophage Series G-200 vaccine in a large, randomized Phase 2 trial in combination with Avastin ® (bevacizumab; Genentech/Roche) in patients with surgically resectable recurrent GBM. The study will be sponsored by the Alliance for Clinical Trials in Oncology, an NCI cooperative group. This trial will investigate the combination of G-200 and Avastin in a three-arm randomized study of approximately 220 patients with surgically resectable recurrent GBM. The study will compare efficacy of G-200 given with Avastin either concomitantly or at progression, versus Avastin alone, in the therapy of surgically resectable recurrent GBM. This study is anticipated to begin enrolling patients during the first half of 2013.In addition to the recurrent GBM study with G-200, a Phase 2 trial testing the Prophage Series G-100 vaccine in patients with newly diagnosed glioma is underway. In this trial, G-100 is being used with the standard of care, which includes Temodar ® (Merck; temozolomide) and radiation. It is believed that the efficacy of G-100 could potentially be enhanced through this combination regimen. Preliminary findings from this study will be presented in a plenary session of a major medical meeting in early May 2013. For additional information please refer to www.clinicaltrials.gov or click on the following link ( http://www.clinicaltrials.gov/ct2/show/NCT00905060?term=C-100-37&rank=1 ) Conference Call and Web Cast Information Agenus executives will host a conference call at 11:00 a.m. Eastern Time today. To access the live call, dial 877.475.3568 (domestic) or 678.809.3092 (international); the access code is 14310694. The call will also be webcast and will be accessible from the company's website at www.agenusbio.com/webcast/ . A replay will be available approximately two hours after the call through midnight Eastern Time on April 25, 2013. The replay number is 855.859.2056 (domestic) or 404.537.3406 (international), and the access code is 14310694. The replay will also be available on the company's website approximately two hours after the live call. About Agenus Agenus Inc. is a biotechnology company working to develop treatments for cancers and infectious diseases. The company is focused on immunotherapeutic products based on strong platform technologies with multiple product candidates advancing through the clinic, including several product candidates that have advanced into late-stage clinical trials through corporate partners. For more information, please visit www.agenusbio.com . The Agenus logo is available at http://www.globenewswire.com/newsroom/prs/?pkgid=8187 Forward-Looking Statement This earnings release contains forward-looking statements, including statements regarding development and clinical trial activities and timelines of the company and its licensees and collaborators; potential benefit of product candidates in development, and potential revenue streams from our partnering and licensing arrangements. These forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially. These risks and uncertainties include, among others, decisions by regulatory authorities, physicians, patients, and our existing and potential licensees and collaborators; the possibility that clinical trial results will not be favorable; the inability to secure favorable partnering arrangements; the ability to raise capital; and the factors described under the Risk Factors section of our Quarterly Report on Form 10-Q filed for the period ended September 30, 2012 and other reports filed with the Securities and Exchange Commission. Agenus cautions investors not to place considerable reliance on the forward-looking statements contained in this release. These statements speak only as of the date of this document, and Agenus undertakes no obligation to update or revise the statements. All forward-looking statements are expressly qualified in their entirety by this cautionary statement. Agenus' business is subject to substantial risks and uncertainties, including those identified above. When evaluating Agenus' business and securities, investors should give careful consideration to these risks and uncertainties. 1. QS-21 Stimulon ® adjuvant and the related agreements, and HerpV are assets of Antigenics Inc., a wholly owned subsidiary of Agenus Inc. 2. QS-21 Stimulon is a component of certain GSK adjuvant systems.