that he has interest in alternative therapy for healing is awesome. most people are too scared to do anything other than allopathic treatment, even when medicine offers them no cure. there are no incurable diseases, he can heal.
my mom had lymphoma. I wish we'd thought of alternative therapies, we were unaware and unquestioning, we were scared like everyone else with a death sentence diagnosis. they said they could treat it with chemo/radiation and she'd probably live 5 years more. no cure. she did the treatment and lived longer than 5 years with it, but it killed her eventually, and her quality of life during was terrible.
I know of someone who overcame lymphoma using gerson therapy. and there are others documented. you can google gerson therapy to find lots of info. the gerson institute will send info as well.
there are other natural therapies, I'm just not familiar with many of them. this is one option, but I'm partial to it since I've done the therapy myself and it brought back my general state of health from a very sick condition.