Sirna Therapeutics (RNAI) 10-Q 2003 Q1 Quarterly report

EXHIBIT 99.2

CERTIFICATION

In connection with the periodic report of Sirna Therapeutics, Inc. (the “Company”) on Form 10-Q for the period ended March 31, 2003, as filed with the Securities and Exchange Commission (the “Report”), I, Marvin Tancer, Chief Financial Officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

3. The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

4. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

Date: May 15, 2003	/s/ Marvin Tancer
	Marvin Tancer Vice President of Operations and Chief Financial Officer