408 INTERLEUKIN-6: A POTENTIAL BIOMARKER OF RESISTANCE TO MULTITARGETED RECEPTOR TYROSINE KINASE INHIBITORS IN CASTRATION-RESISTANT PROSTATE CANCERKutikov, Alexander; Makhov, Peter; Golovine, Konstantin; Canter, Daniel; Sirohi, Mohit; Street, Ryan; Uzzo, Robert G.; Kolenko, Vladimir M. · The Journal of Urology · 2011