Melanoma: The most dangerous form of skin cancer, a malignancy of the melanocyte, the cell that produces pigment in the skin.
Statistically, the probability of having a prostate cancer present with a PSA of between 4 and 10 is around 22 per cent. Once the PSA level rises above 10, the probability goes up to the order of 64 per cent.
Men ages 50 to 59 should have their PSA level checked. 1  If the PSA level is 3 ng / mL or higher, men should talk with their doctor about having a biopsy of the prostate.  If the PSA level is between 1 and 3 ng / mL, men should see their doctor for another PSA test every two to four years.