Callisto Pharmaceuticals Opens Additional Sites for Phase II Clinical Trial of Atiprimod in Advanced Carcinoid Cance...(alternatives. Callisto also hasa proprie...),Health

Date:8/19/2007

alternatives. Callisto also has a proprietary drug Guanilib in preclinical development for gastro- intestinal disorders. Callisto has exclusive worldwide licenses from Genzyme Inc. and M.D. Anderson Cancer Center to develop, manufacture, use and sell Atiprimod and L-Annamycin, respectively. Callisto is also listed on the Frankfurt Stock Exchange under the ticker symbol CA4. More information is available at http://www.callistopharma.com.

Forward-Looking Statements

Certain statements made in this press release are forward-looking. Such statements are indicated by words such as "expect," "should," "anticipate" and similar words indicating uncertainty in facts and figures. Although Callisto believes that the expectations reflected in such forward-looking statements are reasonable, it can give no assurance that such expectations reflected in such forward-looking statements will prove to be correct. As discussed in the Callisto Pharmaceuticals Annual Report on Form 10-K for the year ended December 31, 2006, and other periodic reports, as filed with the Securities and Exchange Commission, actual results could differ materially from those projected in the forward-looking statements as a result of the following factors, among others: uncertainties associated with product development, the risk that products that appeared promising in early clinical trials do not demonstrate efficacy in larger-scale clinical trials, the risk that Callisto will not obtain approval to market its products, the risks associated with dependence upon key personnel and the need for additional financing.

CONTACT: Gary Jacob of Callisto Pharmaceuticals, Inc., +1-212-297-0010

Web site: http://www.callistopharma.com/

Barretto Pacific Corporation

John Baldissera

800-368-1217

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SOURCE Callisto Pharmaceuticals, Inc. Copyright©2007 PR Newswire.

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