Exhibit 23.1
CONSENT OF ERNST & YOUNG LLP,
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the reference to our firm under the caption “Experts” in the Registration Statement (Form S-3) and related Prospectus of Cell Therapeutics, Inc. for the registration of the Company’s 7.5% Convertible Senior Notes due 2011 and 23,266,669 shares of its common stock and to the incorporation by reference therein of our report dated February 6, 2004, with respect to the consolidated financial statements and schedule of Cell Therapeutics, Inc. for the year ended December 31, 2003 included in its Annual Report (Form 10-K/A) for the year ended December 31, 2005, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Seattle, Washington
May 12, 2006
