I'm no expert in healing. But I have done this and that. I always couple my healing with natural medicine. First of all with Cancer. I would tell your friend to research Essaic tea. It was discovered by a nurse who studied the herbal medicine of a tribe (can't remember which one). She not only cured her own cancer but her mother's when she was "terminal". I do not support anyone who sells Essaic tea. The nurse wrote her recipe for people to see, and there is a book out there for people to do it themselves. In herbal medicine it is best to gather herbs from their origin, not from a region they were not originally intended for because every natural factor effects the medicinal qualities. So it takes a great deal of research but if I were to develop cancer, it would be my first choice of action coupled with my doctor's efforts.
Working with herbs to me is magick. It is mother nature's gift to us to cure ourselves.
I do believe that those truly gifted in healing can cure beyond medical knowledge. But it takes years of practice, an accute sense of energy, and a vast knowledge of how the body works spiritually and physically.