=+. Prostate Cancer. Prostate cancer is the most common cancer found in men. Physicians routinely perform a Prostate-Specific Antigen (PSA) test to determine whether there is any evidence of prostate cancer. A patient who tested positive would then go then through an expensive biopsy that costs approximately $1000 and which is not covered by some medical plans. Studies have shown that the test is not very accurate. The false positive rate is 13.5% and the false negative rate is almost 30%.