Racial Disparities in the Presentation, Early Definitive Surgical Treatment, and Mortality Among Men Diagnosed with Poorly Differentiated/Undifferentiated Non-metastatic Prostate Cancer in the USA.

OBJECTIVE: To assess the influence of race on presentation of poorly differentiated/undifferentiated prostate cancer, use of radical prostatectomy (RP) as primary treatment and survival outcomes.

METHODS: Using the 2004-2014 files of the Surveillance, Epidemiology, and End Results (SEER) data, we identified 244,167 black and white men diagnosed with poorly differentiated/undifferentiated prostate cancer. Demographic and tumor characteristics of study patients were compared by race. Logistic regression was used to evaluate the influence of race on receipt of RP. Cox proportional hazard models were fitted to determine the impact of RP and race on cancer-specific mortality (CSM) and all-cause mortality (ACM).

RESULTS: Compared to white men, black men were diagnosed of prostate cancer at a younger age (64.2 years versus (vs) 67.5 years, p < 0.0001) and presented with higher median prostate-specific antigen, PSA (24.4 ng/ml vs 22.1 ng/ml, p < 0.0001) but lower disease stage. Lower proportion of black men received RP compared to white men (33.9% vs 42.6%; p < 0.0001). The odds of receipt of RP were 2 times higher in white men relative to black men. The risks of CSM and ACM were over 2 times and 3 times respectively higher in patients who did not receive RP vs patients who received RP in the study population and in each race.

CONCLUSION: Despite the younger age at diagnosis of poorly differentiated/undifferentiated prostate cancer and higher PSA at diagnosis in black men, white men had significantly higher odds of receipt of RP relative to black men.