The frequency of false positives varies depending on the type of cancer and the screening method used. For instance, mammograms have a relatively high rate of false positives, especially in younger women. Studies suggest that approximately 50-60% of women undergoing annual mammograms for ten years will experience at least one false positive result. In contrast, PSA tests for prostate cancer also show a significant rate of false positives, leading to unnecessary biopsies in many cases.
