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.
These various PSA based tests are used in combination to gauge the risk of prostate cancer in men with a rising PSA after a negative prostate biopsy. Because prostate biopsies are not without risks, not every PSA rise in men necessitates a repeat biopsy.