Certainly, the oncologists cannot condone anything that isn't an approved standard of care. If it isn't a standard of care, it is a liability. Even going for clinical trials is, in essense, a standard of care.

I wish I could be of more help to you while you walk the "wait-and-see" tightrope. It isn't pleasant. Sending a lot of hugs, prayers, and positive vibes for you to find something helpful to move your dad from patient back to survivor.