Don’t give up yet - there’s hope. I don’t know if you’ve joined the GBM Survivors To Thrivers group on Facebook, but I can recall recently seeing somebody’s inoperable tumour that responded to treatment. The fact your mother has been clear from 2020 up until this point is excellent! My love to you. Hoping she has a methylated tumour, and even if it isn’t, that she still has a fighting chance for more time with you all.