KLK3 and prostate adenocarcinoma: Based on a sample of 162 patients who had prostate biopsy, the authors found no statistically significant differences among the three ethnic groups on mean PSA level (22.0 ng/dl for White, 18.1 ng/dl for Mulatto, and 19.3 ng/dl for Black; p value of 0.65) and prostate adenocarcinoma prevalence (53.3% for White, 53.3% for Mulatto, and 64.9% for Black; p value of 0.36).