(google the story of Joe Tippens; he was so far gone he had nothing to lose, so he tried anti-fungal medicine and his cancer was gone in three months.)
Not quite the same as a direct answer to prayer, but it may work.
Thank you for that information about Tippens. Had never heard of it. Fascinating. It isn’t an anti-fungal, though. His cure/containment involves an anthelmintic, which is used to fight parasitic worms.