You probably don't need to hear it, but I absolutely concur with the two opinions already given. I know your grandad is 76 years old, but giving up on treatment just to provide a little more comfort to him is accepting the likelihood of a much worse long term problem to get a short term benefit.

Many patients have had similar side effects to the ones your grandad is experiencing. Often times they are absolutely miserable when being endured. And they may get worse before they start to get better. But they are also very survivable and the long term benefits are way more important.

Seriously, think long and hard before you decide to terminate treatment.

Tony, 69, non-smoker, aerobatics pilot, bridge player/teacher, avid dancer (ballroom, latin, swing, country)

09/13 SCC, HPV 16, tonsillectomy, T2N0.
11/13 start rads, no chemo
12/13 taste gone, dry mouth,
02/14 hair slowly returning
05/14 taste the same, dry sinuses, irrigation helps.
01/15 food taste about 60% returned, dry sinuses are worse in winter.
12/20 no more sinus problems, taste pretty good