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.
1 Repeating your PSA test, most often sometime within 3 months. 2  A prostate biopsy. 3  A follow-up test called a free PSA (fPSA). The lower the level of this test, the more likely it is that prostate cancer is present.  A urine test called PCA-3.