Having been witness to that kind of god-like behaviour from the doctor who treated my father, and not having the option of switching doctors available to us, the only suggestion I can offer is to do your research online, and bring copies of what you discover with you to your doctor - especially if you can download the information from official research sites. Do your research from your local library and you will discover even more information is available through their subscriptions. It generally helps to try to get more than one reference, too. It might also help if you can find a way to communicate to your doctor that you are representing the patient and that you are only trying to ensure they explore every avenue possible, which they too, would do for a loved one. I think that in order to deal with cancers, some doctors have to turn their patients into objects, to reduce the emotional toll it would take. You have to turn the patient back into a human and force the doctor to see the whole picture.
Do not let doctors intimidate you. I know my father died sooner and more painfully, because of their arrogance. Every doctor My Dad saw refused to consider that he had multiple myeloma, although he knew it himself from researching his symptoms on the internet. I suppose it was because he felt that he was not getting through to them that he asked me to attend his appointments and to act on his behalf. Unfortunately, I wanted to believe the doctors and hoped that it was not serious, but he was really sick by that time. He was not diagnosed until 2 weeks before he died and then if you can believe it, the hematologist was angry that my Dad wanted to start chemo because in his infinite doctor wisdom, he had determined that it was too late to intervene.
Don't ask, tell. If you are armed with the information, tell them you want to investigate it and to put you in touch with whomever provides that therapy. Sometimes our approach allows us to be run over.
I have found few doctors here in Canada who are not under the spell of the drug companies, but they do exist and are willing to listen if you can find one and are able to switch. I am fortunate to have one and he has changed my life through diet. (See the celiac-multiple myeloma connection thread in this forum) He has also told me to do research online, but to be careful about your sources.
I wish you the best. I know you have enough of a battle to deal with already, without having to battle the medical system and my sympathies really are with you.