At 84 does he really need treatment? A genetic test could give you a better idea of how aggressive his cancer is if at all. Do the people in his family life to be 100 or something? I am 74 with 4-3 in two cores and just finished 5 proton radiation treatments at Mayo Phoenix. The only "burns" I got from the five 725 cGY fractions were two approximately 5 inch tan circles, one on each hip where the radiation went in. 40 treatments over 5 months you two must like hospitals or something. My treatments were on Monday, Wednesday, Friday, Monday, and the last one on Wednesday.