PROSTATE SPECIFIC ANTIGEN AND PATHOLOGICAL FEATURES OF PROSTATE CANCER IN BLACK AND WHITE PATIENTS: A COMPARATIVE STUDY BASED ON RADICAL PROSTATECTOMY SPECIMENS

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Abstract
Purpose: We compared the relationship of pathological features and preoperative prostate specific antigen (PSA) levels of a consecutive series of black patients to a stage matched cohort of white patients treated during the same period. Materials and Methods: The radical prostatectomy specimens of 40 black patients were reviewed and tumor volume was determined. Histopathological features (stage, grade, zonal distribution of cancer foci), tumor volume and prostate weight were correlated to pretreatment serum PSA levels. These parameters were compared with those of 148 white patients matched by pathological stage. Results: Black patients exhibited a significantly higher incidence of seminal vesicle involvement (p = 0.03) and cancers with a Gleason score of 8 or more (p = 0.02), and a trend toward decreased pathologically organ confined, margin negative disease (40% black versus 53% white men, p = 0.13). Although the incidences of multifocal cancer were virtually identical (90 and 82%) in the 2 groups, black patients exhibited a higher incidence of transition zone cancer foci (p <0.001). Mean prostate tumor volume, total gland weight and serum PSA level among black and white patients with pathological stage pT2-, pT2+ and pT3- cancer were not significantly different. However, with advancing pathological stage (pT3+ and pT3c) disease black patients had higher preoperative serum PSA levels on univariate and multivariate analyses despite similar total gland weight and tumor volume. Conclusions: Black patients who underwent radical prostatectomy often exhibited adverse pathological features. Two novel findings were that the distribution of cancer foci within the prostate was significantly different between black and white patients, and that serum PSA levels in patients with locally advanced prostate cancer were higher in black than in white men, despite adjustment for known variables affecting PSA. These observations suggest that differences in the biology of prostate cancer between these 2 races may exist.