Petrylak D, Eigl B, Senkus E, Loriot Y, Twardowski P, Castellano D, Blais N, Sridhar S, Sternberg C, Retz M, Blumenstein B, Jacobs C, Stewart P, Bellmunt J. 2637 Baseline circulating tumor cells (CTC) and serum heat shock protein 27 (Hsp27) levels are increased in advanced bladder cancer (BC) patients with poor prognostic factors: Results from the randomized phase 2 Borealis-1™ trial of first-line gemcitabine/cisplatin plus apatorsen or placebo. European Journal Of Cancer 2015, 51: s525. DOI: 10.1016/s0959-8049(16)31454-x.Peer-Reviewed Original Research