Incidental Prostate Cancer in Radical Cystoprostatectomy Specimens is Associated with Worse Overall Survival.

Abstract

The impact of incidental prostate cancer (IPC) on oncological outcomes after radical cystoprostatectomy (RCP) specimens from patients with bladder cancer (BC) remains controversial. This relationship has not been well elucidated in Asian countries, where the incidence of prostate cancer has recently shown dramatic increases. This study retrospectively compared pathological features and oncological outcomes between BC patients with and without IPC in the RCP specimens. This study included 142 men who underwent RCP for BC. Men who were previously diagnosed with prostate cancer were excluded. Each prostate gland and seminal vesicle was processed as whole mounts and 4-mm close-step sectioning was performed. A single genitourinary pathologist diagnosed IPC. The pathological features and oncological outcomes such as overall survival (OS), bladder cancer-specific survival (BCSS), and progression-free survival (PFS) were compared between patients with IPC (IPC+group, n = 45) and without IPC (IPC- group, n = 97). P values less than 0.05 considered to indicate statistical significance for patients' characteristics. Because of multi-primary endpoint, P values less than 0.0167 was considered statistical significance for oncological outcomes. We detected IPC in 45 RCP specimens (31.6%). Patients in the IPC- group were significantly younger at surgery than those in the IPC+group (P < 0.001). The pathological features of the RCP specimens did not differ significantly. In multivariable analyses, presence of IPC was significantly associated with worse OS (P = 0.005), but not with either BCSS or PFS (P = 0.038 and 0.326, respectively). In Kaplan-Meier analyses, OS tended to be longer in the IPC- group than that in the IPC+group (NR vs 65 months, P = 0.0017). Our results suggested significantly better OS in patients without IPC than that in those with IPC.