People who choose alternative methods to cancer treatment.....Who gives them the diagnosis of cancer?

I don't know about other countries but in England once a diagnosis is made, usually by a specialist, the decision of what treatment to use is decided by the patient. The options, side effects and likelihood of success are all discussed and pain management and more unusual therapies may be included. The main focus is the well being of the patient. You need to be able to live with your diagnosis.