"An experimental cancer drug that activates the immune system has shown early promise for advanced cases of melanoma skin cancer, researchers report.
"The findings come from an early stage trial of just 31 patients. But experts were cautiously optimistic about what the study showed: The drug's side effects were manageable, and four patients saw their tumors shrink.
"That's a small number, but a trial like this is largely aimed at seeing whether a drug is safe and finding a tolerable dose."
Editor's note: This story is about a new melanoma drug called IMCgp100 that is being tested in patients. Learn more about immunotherapy drugs and clinical trials for melanoma here.