AFFX Affymetrix, Inc.

Affymetrix to Host Conference Call to Announce Third Quarter 2004 Results SANTA CLARA, Calif., Oct. 13 /PRNewswire-FirstCall/ -- Affymetrix, Inc. (NASDAQ:AFFX) today announced it will release financial results for the third quarter of 2004 after the close of the stock market on Wednesday, October 20, 2004. The news release will be followed by a conference call available to all interested parties at 2:00 p.m. PT on October 20. During the conference call, Affymetrix' management team will review its operating results for the third quarter and provide financial guidance for the remainder of 2004. The press release and the live webcast can be accessed by visiting the "Investors" section of Affymetrix' Internet website at http://www.affymetrix.com/. The conference call can be accessed by dialing 877-691-0878. International callers should dial 973-582-2776. A replay of the conference call will be available until 5:00 p.m. PT on October 27 at the following numbers: domestic: 877-519-4471, international: 973-341-3080; passcode for both: #5265716. An archived webcast will be available under the "Investors" section of the Company's website at http://www.affymetrix.com/. About Affymetrix: Affymetrix is a pioneer in creating breakthrough tools that are driving the genomic revolution. By applying the principles of semiconductor technology to the life sciences, Affymetrix develops and commercializes systems that enable scientists to improve the quality of life. The Company's customers include pharmaceutical, biotechnology, agrichemical, diagnostics and consumer products companies as well as academic, government and other non-profit research institutes. Affymetrix offers an expanding portfolio of integrated products and services, including its integrated GeneChip(R) platform, to address growing markets focused on understanding the relationship between genes and human health. Additional information on Affymetrix can be found at http://www.affymetrix.com/. DATASOURCE: Affymetrix, Inc. CONTACT: Doug Farrell, Vice President of Investor Relations of Affymetrix, Inc., +1-408-731-5285 Web site: http://www.affymetrix.com/

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