If it has been my grandmother, I would have "set the world on fire" to use any option to fight the cancer by all means available!!
I have a strong feeling hat she did NOT approved his marriage with Michelle (racists???) because at seems that she and the kids did NOT visit granny the times the visited Hawaii, hmmm!!!
That may not have been her wishes.
My mother, 82 today, has made it clear in no uncertain terms that she wants no extraordinary measures. Although her basic guidline leaves a little wiggle room. If there's a *good* chance she'll get better, then do the treatment. Otherwise, make her comforatable. As it happens she has been undergoing treatment for breast cancer that spread to her lungs after her masectomy. The treatment appears to be working, and it has caused her no side effect problems. Turns out that breast cancers are one which respond quite well to this treatment. The only thing I wonder about is why they didn't give her a round of it right after the surgery, instead of waiting until the metastized fragments started causing problems in her lungs.