I certainly don't profess to understand the science your RO is dealing with comparing all the radiation options so it's difficult for me to totally understand why IMPT wouldn't deliver the least damage in the most effective way regardless of how many gys you have already had or the results of those overlays but it sounds like your fortunate that you have someone who is throughly examining all the options scientifically. Man lets hope you catch some breaks and this cancer can be trumped for good.

David

Age 58 at Dx, HPV16+ SCC, Stage IV BOT+2 nodes, non smoker, casual drinker, exercise nut, Cisplatin x 3 & concurrent IMRT x 35,(70 Gy), no surgery, no Peg, Tx at Moffitt over Aug 06. Jun 07, back to riding my bike 100 miles a wk. Now doing 12 Spin classes and 60 outdoor miles per wk. Nov 13 completed Hilly Century ride for Cancer, 104 miles, 1st Place in my age group. Apr 2014 & 15, Spun for 9 straight hrs to raise $$ for YMCA's Livestrong Program. Certified Spin Instructor Jun 2014.