CONSENT OF INDEPENDENT AUDITORS
We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the 2000 Equity Incentive Plan, 2000 Employee Stock Purchase Plan and 2000 Non-Employee Directors' Stock Option Plan of Rigel Pharmaceuticals, Inc. of our report dated January 24, 2003, except for Note 9 as to which the date is January 31, 2003, with respect to the financial statements of Rigel Pharmaceuticals, Inc. included in its Annual Report on Form 10-K/A, as amended, for the year ended December 31, 2002, filed with the Securities and Exchange Commission.
| /s/ ERNST & YOUNG LLP | ||
Palo Alto, California June 20, 2003 |