Sayin' it's so, doesn't make it so. Good luck to Mike. But modern Science does not have the ability to test every individual cell in the body for cancer. And, that's what you would need to truly report that someone has been cured of cancer.
"We don't see any cancer". True, but your ability to "see" on the cellular level is non-existent. "This area of the ocean must be free from enemy submarines because I can't see any on the surface of the water".