My friend, the breast cancer surgeon, was talking about this yesterday. She said she had been researching the members of the U.S. Preventive Services Task Force, and that while they are doctors, they aren't cancer doctors ... family medicine, pediatrics, specialists in medical informatics and medical economics, but interestingly, not cancer.
Just
looking over the list, not a lot of them appear to be in active practice, either ... researchers, university posts, that kind of thing.