Pal SK, et al. - Herein, researchers sought to quantify the expression of synaptophysin (Syp) on circulating tumor cells (CTCs) in the case of castration resistant prostate cancer patients being treated with abiraterone acetate or enzalutamide. Data demonstrated that Syp could be quantified on CTCs. The Syp expression exhibited a connection with the resistance to abiraterone and enzalutamide.