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 aged 50 â 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. 2  If the PSA level is between 1 and 3 ng / mL, men should see their doctor for another PSA test every 2 - 4 years.