Gary should be the one to answer the rad question but basically gy stands for a unit of radiation called a gray. One gray or gy is equal to 100 rads which I think used to be the way they expressed the rad units. SO 70 gy would equal the 7000 that his doc is talking about but I'm not sure where he's getting the 1600 from.

As far as the 3rd Cis, part of it will have to with how well he handles the 1st 2 because if he's really bad of they will not go for #3. I was borderline but they decided to torture me a little more. lol

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.