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.
A prostate biopsy is a procedure to remove small samples of prostate tissue to be examined under a microscope. See an illustration of the prostate gland. For a prostate biopsy, an ultrasound probe is inserted through the rectum ('transrectal ultrasound') and needles passed ('transrectal biopsy'). The biopsy samples are examined under a microscope for cancer cells.