It sounds like you need to fire that guy and find a center of excellence with more than one radiation oncologist/radiologist who knows what he or she is doing and has done it many, many times. I realize that Fairbanks AK is a location that makes it difficult to go elsewhere. It might be worth the trouble and expense to fly to MSP and seek help at Mayo Rochester. You could send images and lab results to Mayo in advance, do some initial consults via telehealth, and then get in-person appointments in Rochester. Another option is the excellent cancer care consortium in Seattle. Good luck and don't hesitate to advocate for yourself!