Xanthus Pharmaceuticals, Inc. To Present At Three Upcoming Investment Conferences

CAMBRIDGE, Mass., Nov. 2 /PRNewswire/ -- Xanthus Pharmaceuticals, Inc., a privately-held oncology drug development company, today announced that it will be presenting at the following upcoming investment conferences in November:

* Richard T. Dean, Ph.D., Chief Executive Officer, will present at the Rodman & Renshaw 8th Annual Healthcare Conference on November 7, 2006 at 4:35pm at the Palace Hotel in New York. * Richard T. Dean, Ph.D., Chief Executive Officer, will present at the CIBC World Markets 17th Annual Healthcare Conference on November 8, 2006 at 1:50pm at the Waldorf-Astoria in New York. * Robert L. Capizzi, MD, Senior Vice President, Chief Medical Officer will present at the ThinkEquity Partners ThinkTank Conference on November 10, 2006 at 2:00pm at the Ritz Carlton in New York.

A live audio webcast of the CIBC presentation will be available on the Company’s website located at http://www.xanthus.com. A replay of the presentations will be posted on the Xanthus website approximately thirty minutes after the event.

About Xanthus Pharmaceuticals, Inc.

Xanthus Pharmaceuticals, Inc. is developing a portfolio of novel, clinical-stage, small-molecule oncology candidates through a management team whose accomplished track record encompasses all aspects of drug development, from discovery through regulatory approval and commercialization. The Company is applying its expertise both to advance its current pipeline and expand it into indications of unmet medical need beyond oncology.

Xanthus is headquartered in Cambridge, Massachusetts with an additional facility in Montreal, Quebec. More information is available at http://www.xanthus.com.

Contacts: Kari Watson, MacDougall Biomedical Communications, Inc. - kwatson@macbiocom.com or (508) 647-0209 Lisa Terry, Xanthus Pharmaceuticals, Inc. - lisa.terry@xanthus.com or (617) 225-0522, x 105

Xanthus Pharmaceuticals, Inc.

CONTACT: Lisa Terry of Xanthus Pharmaceuticals, Inc., +1-617-225-0522,ext. 105, lisa.terry@xanthus.com; or Kari Watson of MacDougall BiomedicalCommunications, Inc., +1-508-647-0209, kwatson@macbiocom.com

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