Reply to Letter by Dr. Christoph Kupferschmid： Commentary on ＂Countries with high circumcision prevalence have lower prostate cancer mortality

Dear Editor, We thank Dr. Kupferschmid for his interest in our study, which examined male circumcision （MC） and prostate cancer mortality〉2 Considerable strong evidence has been accumulated since 1951.3 Most of his references4-10 do not address MC and the risk of death from prostate cancer. That is a different question than MC and the risk of developing prostate cancer, which none of his references validly assess. One reference addressed bacterial colonization,6 not prostate cancer. Another7 concerned sexually transmitted infections and prostate cancer.