A half a million women in North America and Europe participated in randomized clinical trials where half had mammograms and the other half did not. In the end, there was virtually no difference in mortality rate of breast cancer or other types of cancers, but 10% of those who were screened were given false diagnosis. The chart below puts the numbers more clearly. In a Time magazine article that highlights the reasons why we are so steeped with misinformation, it also highlights how prostate exams aren't any better. it reduced neither deaths from prostate cancer nor total mortality. It states, "The percentage of men who died of prostate cancer was virtually the same in the U.S. and the U.K. Most importantly, randomized clinical studies with hundreds of thousands of men have shown no proof at all that early detection with prostate-specific antigen (PSA) tests saves lives; it reduced neither deaths from prostate cancer nor total mortality."