Just read it. Read the whole. A story that would make an Oscar-winning screenplay. The story of Eric Drew.
I was originally put onto this by M.Italiano, regarding a small part of the story: that this man's genes changed as the result of his cancer treatment. But there's far more to the story than that. I can't summarise it, and I won't attempt to.
From DISCOVER magazine, The Man Who Lost His Name—and His Genetic Identity
You might want to go visit here afterwards too.