Exhibit 23


            Consent of Independent Registered Public Accounting Firm
            --------------------------------------------------------

Callisto Pharmaceuticals, Inc.
New York, New York

We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-8 (No.  333-119648)  of Callisto  Pharmaceuticals,  Inc. and
subsidiaries  of our report dated March 14, 2005,  relating to the  consolidated
financial statements which appear in this Form 10-K/A.

/s/ BDO Seidman, LLP

BDO Seidman, LLP
New York, NY

June 3, 2005