After I posted, I did a quick search to check out more recent melamona vaccines and although the worrying reports of serious and fatal side effects from some genetic vaccines had nothing to do with melanoma per se, I should not have recommended anything without provisos. Clinical trials are fraught with untold hazards and even researching and judging each on its own merits before signing up doesn't guarantee previously unknown side effects won't surface in time.
My sincere apologies.