AFFX Affymetrix, Inc.

Affymetrix to Host Conference Call to Announce Fourth Quarter and Fiscal Year 2004 Results SANTA CLARA, Calif., Jan. 19 /PRNewswire-FirstCall/ -- Affymetrix, Inc. (NASDAQ:AFFX) today announced that it will release results for the fourth quarter and fiscal year 2004 after close of the stock market on Wednesday, January 26. Company management will also host a conference call at 2:00 p.m. PT on January 26 to discuss Affymetrix' results for the fourth quarter and fiscal year 2004 and provide financial guidance for the first quarter and fiscal year 2005. The dial in number for domestic callers will be 888-396-2356 and for international callers will be 617-847-8709. The passcode for both domestic and international callers is 75652162. A live webcast of the conference call can be accessed by visiting Affymetrix' website at http://www.affymetrix.com/ under the "Investors" tab. A telephonic replay of the conference call will be available until 5:00 p.m. PT on February 2. The replay number for domestic callers will be 888-286-8010 and for international callers will be 617-801-6888. The passcode for both domestic and international callers is 28234721. An archived webcast of the conference call will be available under the "Investors" section of the company's website at http://www.affymetrix.com/. The conference call, replay and webcast are open to all interested parties. 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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