This is not always possible to predict because the course of cancer can suddenly go from mild to aggressive. The prognosis is usually person-specific and is determined by a lot of factors. The prognosis would depend on the type of cancer, the test results, age, fitness, health levels, medical history and cancer's growth rate. Prostate cancers are often slow-growing, and aggressive types are still usually slower-growing than other cancer types. If detected early and treatment is started, prostate cancer has one of the highest five-year survival rates.