The five-year survival for patients with stage 4 melanoma is around 15 to 20 percent, according to the American Cancer Society. The 10-year survival rate is approximately 10 to 15 percent; however, a variety of other factors affect survival.
Survival rates can be higher if the melanoma has not spread to other organs and if the patient has a normal blood level of lactase dehydrogenase, states the American Cancer Society. Older people tend to have shorter survival times, with a significant drop in survival rates after age 70. People with weakened immune systems, including those infected with HIV, are also at greater risk. Survival rates are rough estimates; for a more accurate perspective, it is best for the patient to consult with his doctor, who has a comprehensive understanding of the particular situation.