TELIK ANNOUNCES TELCYTA™ PRESENTATIONS AT ASCO MEETING

Palo Alto, CA, May 28, 2003 — Telik, Inc. (Nasdaq: TELK) announced the following presentations on its TELCYTA™ (TLK286) product candidate at the American Society of Clinical Oncology (ASCO) meeting in Chicago:

Phase 2 Study of TLK286 Administered Weekly in Patients with Non-Small Cell Lung Cancer Who Failed Prior Platinum-Based Regimens (abstract #2636); Saturday, May 31, 9:00 a.m. — 1:00 p.m.

Phase 2 Study of TLK286 Administered Weekly in Patients with Platinum Refractory or Resistant Third-Line or Greater Advanced Ovarian Cancer (abstract #1816); Sunday, June 1, 1:00 — 5:00 p.m.

Phase 2 Study of TELK286 as Third-Line or Greater Therapy in Patients with Advanced Metastatic Breast Cancer (abstract # 61); Monday, June 2, 8:00 a.m. — noon

TELCYTA™ is a small molecule prodrug which is activated by GST P1-1, an enzyme present in higher levels in many human cancers than in normal tissues. Upon activation, an intracellular process known as apoptosis, or programmed cell death, is initiated. TELCYTA™, which has been evaluated in clinical trials in more than 370 patients, was discovered through the application of Telik’s proprietary drug discovery technology, TRAP. Telik has retained worldwide commercialization rights.

About Telik, Inc.

Telik, Inc. of Palo Alto, CA is a biopharmaceutical company working to discover, develop and commercialize small molecule drugs to treat serious diseases for which there is significant demand for new therapies. The company’s most advanced drug development candidate is TELCYTA™, in a Phase 3 registration trial in advanced ovarian cancer, and in earlier stage clinical trials in ovarian, non-small cell lung and breast cancer. Telik’s product candidates were discovered using its proprietary technology, TRAP, which enables the rapid and efficient discovery of small molecule drug candidates. Additional information is available at www.telik.com.

You should not rely on forward-looking statements contained in this press release, including statements regarding our ability to successfully develop TELCYTA™ for the treatment of any cancer, its tolerability, potential efficacy or market potential. Telik can give no assurance with regard to these statements. None of our products have been determined to be safe or effective in humans or been approved for marketing. Substantial additional testing, including randomized, controlled clinical trials of TELCYTA™ will be necessary prior to seeking marketing approval. There can be no assurance that such trials will accrue sufficient patients, be conducted with sufficient quality, in a timely manner, have a successful outcome, or that regulatory approval will be obtained. In addition, we are reliant on external manufacturing, and any interruption or delay in drug supply could adversely affect the development program. More detailed information regarding factors that may cause actual results to differ materially from the results expressed or implied by statements in this press release may be found in Telik’s periodic filings with the Securities and Exchange Commission. Telik assumes no obligation to update any information in this press release.

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Contact:
Carol DeGuzman
Senior Director, Corporate Communications
Telik, Inc.
Tel 650-845-7728
Email cdeguzman@telik.com


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