I am so sorry for your sons prognosis rarsie.
Peanutz partner may be at different stage in his battle, and as I mentioned with my wife with using the Avastin, it reduced the tumours significantly. A different cancer, but on first dx she was stage 4 and palliative, she went on for a further 2 yrs after dx, with a good quality of life. One of the lesions was discovered at 118mm, grapefruit size, within a few months on Avastin and other drugs (chemo) it reduced to 58mm. It was wonderful to have her with me for those extra 2yrs.
Its a tough call, and of course the wishes of the sufferer are foremost.
god bless all
Wombat4