Date:7/14/2008

cers and other members of management and employees may be deemed to be participants in the solicitation of proxies in connection with the proposed transaction. Information about the directors and executive officers of Sonus, including their respective security holdings, is set forth in Sonus' Amendment # 1 to Form 10-K for the fiscal year ended December 31, 2007, filed with the Securities and Exchange Commission on April 29, 2008, and the Proxy Statement filed with the SEC on July 3, 2008. As of June 30, 2008, OncoGenex' directors and executive officers beneficially owned approximately 1,755,000 shares, or 14.5%, of OncoGenex' capital stock. Investors may obtain additional information regarding the interests of OncoGenex, Sonus and their respective executive officers and directors in the merger by reading the Proxy Statement for such proposed transaction.

The Proxy Statement and other relevant materials, and any other documents filed by Sonus with the SEC, may be obtained free of charge at the SEC's web site at http://www.sec.gov. In addition, investors and security holders may obtain free copies of the documents filed with the SEC by Sonus by directing a request to: Sonus Pharmaceuticals, Inc., 1522 217th Place SE, Suite 100, Bothell, WA 98021, Phone (425) 686-1500, Fax (425) 686-1600, Attention: Investor Relations.

CONTACT: OncoGenex Media and Investor Contact: Jason I. Spark, Porter Novelli Life Sciences, (619) 849-6005, jspark@pnlifesciences.com

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SOURCE OncoGenex Technologies Inc. Copyright©2008 PR Newswire. All rights reserved

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