@songinmyheart54 Interesting. So in your case they are treating Keytruda as a long term drug that may fend off melanoma, but if you stop the chances of melanoma coming back are likely. I never imagined any of the immunial therapy drugs to be a permanent medication. That would get very expensive in a hurry. I know one treatment is close to 23,000 us dollars every 6 weeks. 400 mg. Thanks for your response.