AFFX Affymetrix, Inc.

Affymetrix, Inc. (Nasdaq:AFFX) today announced that it will release results for the fourth quarter and fiscal year 2007 after close of the stock market on Thursday, January 31, 2008. Affymetrix' management team will host a conference call on January 31, 2008 at 2:00 p.m. PT to review its operating results for the fourth quarter and fiscal year 2007. A live webcast can be accessed by visiting the Investor Relations section of the Company�s website at www.affymetrix.com. In addition, investors and other interested parties can listen by dialing domestic: (866) 500-AFFX, international: (706) 643-2771. A replay of this call will be available from 5:00 p.m. PT on January 31, 2008 until 8:00 p.m. PT on February 6, 2008 at the following numbers: domestic: (800) 642-1687, international: (706) 645-9291. The passcode for both replays is 30994152. An archived webcast of the conference call will be available under the Investor Relations section of the Company's website at www.affymetrix.com. About Affymetrix Affymetrix GeneChip� microarray technology is the industry-standard tool for analyzing complex genetic information. After inventing microarray technology in the late 1980s, Affymetrix scientists have been dedicated to developing innovative products that provide researchers with a more complete view of the genome. These products continue to accelerate genetic research and enable scientists to develop diagnostics and tailor treatments for individual patients by identifying and measuring the genetic information associated with complex diseases. Today, Affymetrix technology is used by the world's top pharmaceutical, diagnostic and biotechnology companies, as well as leading academic, government and not-for-profit research institutes. More than 1,600 systems have been shipped around the world and more than 10,500 peer-reviewed papers have been published using the technology. Affymetrix is headquartered in Santa Clara, Calif., and has manufacturing facilities in Sacramento, Calif., and Singapore. The company has about 1,100 employees worldwide and maintains sales and distribution operations across Europe and Asia. For more information about Affymetrix, please visit: www.affymetrix.com.