Frequency of Ejaculation and Risk of Prostate Cancer
Abstract
To the Editor: In their prospective study, Dr Leitzmann and colleagues1 replicated the findings of our case-control study2 in regard to a protective relationship between frequency of ejaculation and risk of prostate cancer. Although the study of Leitzmann et al avoids the potential for recall bias, for both their study and ours the accuracy of ejaculation assessment was likely to be affected by problems in recall of past practice, particularly of that in early adult life. We believe that the...