Exhibit

We consent to the incorporation by reference in the Registration Statement of CTI BioPharma Corp. on Form S-3 (Nos. 333-108926, 333-134126, 333-149980, 333-149981, 333-152171, 333-157376, 333-160969, 333-163479, 333-161442, 333-177506, 333-182330, 333-183037, 333-192748, 333-192749, 333-200452 and 333-200453) and Form S-8 (Nos. 333-146624, 333-152168, 333-158260, 333-162955, 333-170044, 333-178158, 333-184004, 333-189611, 333-196510, 333-207176 and 333-207177) of our report dated February 16, 2016, with respect to our audits of the consolidated financial statements of CTI BioPharma Corp. as of December 31, 2015 and 2014 and for the years ended December 31, 2015, 2014 and 2013 and our report dated February 16, 2016 with respect to our audit of the effectiveness of internal control over financial reporting of CTI BioPharma Corp. as of December 31, 2015, which reports are included in this Annual Report on Form 10-K of CTI BioPharma Corp. for the year ended December 31, 2015.