Chou R, Croswell JM, Dana T, et al. Screening for prostate cancer: A review of the evidence for the U.S. Preventive Services Task Force. Ann Intern Med 2011;155(11):762-771.
Synopsis
This review of the evidence, which was completed some months ago, was slow to come to print given the firestorm that erupted following the recent less-than-enthusiastic assessment of screening for breast cancer. Ah, politics. To develop this evidence review, the Task Force searched MEDLINE and the Cochrane Library, along with a review of reference lists of identified articles, to identify the 5 studies that evaluated the effectiveness of PSA screening. Two reviewers independently evaluated each study for inclusion and one investigator abstracted the data with a second investigator reviewing the data for accuracy. Unfortunately, the 2 largest studies were rated as only "fair" quality and 3 other studies were rated as "poor." Neither of the fair studies found a benefit to prostate cancer screening with regard to mortality, though one (the European study) found a sm all benefit (0.07 percentage point) in men between the ages of 55 years and 69 years.
Harm is common with screening: 12% to 13% of men will have at least one false positive PSA screening result after 3 to 4 rounds of testing and approximately half these patients will have a resulting biopsy. Urinary retention or serious infections occur in approximately 1% of biopsies. Psychological harms from false positive results or overdiagnosis are also reported but difficult to quantify.
Regarding the benefits and harms of treatment for early-stage or screening-detected cancer, one good-quality trial found that prostatectomy for localized prostate cancer results in a 6.1% absolute risk reduction in prostate cancer-specific mortality.
However, the numbers needed to treat to harm are on the order of 200 for perioperative death, 50 for cardiovascular events, 5 for urinary incontinence, and 3 for erectile dysfunction. There have been no randomized trials of radiation therapy versus watchful waiting, so the evidence for mortality benefit (although shown in multiple studies) comes from cohort research. Adverse effects associated with radiation therapy include erectile and bowel dysfunction.
LOE = 1a