The biggest problem is getting insurance companies to cover it. It is a very expensive product to be sitting on the shelves of a primary care doc. They don't get the big discounts and easy availability that the public health departments do.
Insurance companies will cover this- they will see the cost benefit analysis and probably end up doing it for free. I stopped counting my medical bills at 200,000.,it's way more now (see my post 148.) I have great insurance, but my oncologist is not in my system so I have some out of pocket.
Insurance companies never want to pay for treatment if they can avoid it.