Rigel Pharmaceuticals, Inc. Announces Presentations At Two Investor Conferences

SOUTH SAN FRANCISCO, Calif., June 7 /PRNewswire-FirstCall/ -- Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL - News) today announced corporate presentations at two upcoming investor conferences:

Pacific Growth Equities 2006 Life Sciences Conference InterContinental Mark Hopkins Hotel, San Francisco, CA Presenter: James M. Gower, Chairman and Chief Executive Officer Tuesday, June 13 12:00 p.m. PDT *Will be webcast

Needham & Company, LLC’s Fifth Annual Biotechnology and Medical Technology Conference New York Palace Hotel, New York City Presenter: Raul R. Rodriguez, Executive Vice President and Chief Operating Officer Wednesday, June 14 9:30 a.m. EDT *Will be webcast

To access the live audio webcast or the subsequent archived recording, log on to www.rigel.com/rigel/events. Please connect to Rigel’s website several minutes prior to the start of the live webcast to ensure adequate time for any software download that may be necessary.

About Rigel (www.rigel.com)

Rigel is a clinical-stage drug development company that discovers and develops novel, small-molecule drugs for the treatment of inflammatory diseases, cancer and viral diseases. Our goal is to move one new product candidate for a significant indication into the clinic each year. We have achieved this goal since 2002. Our pioneering research focuses on intracellular signaling pathways and related targets that are critical to disease mechanisms. Rigel’s productivity has resulted in strategic collaborations with large pharmaceutical partners to develop and market our product candidates. We have product development programs in inflammatory/autoimmune diseases such as rheumatoid arthritis, thrombocytopenia, and asthma and allergy, as well as in cancer.

This press release contains “forward-looking” statements, including statements related to Rigel’s plans to pursue clinical development of product candidates and the timing thereof, the potential efficacy of product candidates and the sufficiency of financial resources. Any statements contained in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Words such as “plans,” “intends,” “expects,” “anticipates” and similar expressions are intended to identify these forward-looking statements. There are a number of important factors that could cause Rigel’s results to differ materially from those indicated by these forward-looking statements, including risks associated with the timing and success of clinical trials and the commercialization of product candidates, as well as other risks detailed from time to time in Rigel’s SEC reports, including its Form 10-Q for the quarter ended March 31, 2006. Rigel does not undertake any obligation to update forward-looking statements.

Contact: Raul Rodriguez Phone: 650-624-1302 Email: invrel@rigel.com

Media Contact: Carolyn Bumgardner Wang, WeissComm Partners, Inc. Phone: 415-946-1065 Email: carolyn@weisscommpartners.com

Source: Rigel Pharmaceuticals, Inc.

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