What US Laws Punish Doctors For Using Alternative Cancer Treatments?

What specific US laws punish doctors for using anything besides radiation, surgery or chemo for treating cancer? I’ve heard several people talk about this now. What are the specific laws that are used?

I’ve heard several times, that it is illegal for MDs to treat cancer patients with anything other than chemo, surgery or radiation.

No specific law is required. The FDA and AMA can set their own guidelines, etc. as far as I know.