Hello ginette55 @ginette55 ,
I'm sorry to hear about your diagnosis. I myself have a GBM for 18 months which is centered in the middle of the brain and therefore inoperable. I have had chemo for 13 months and the tumor remains stable. This is to tell you that there are sometimes possibilities to control the growth of the tumor. Is it the best thing to do? In my case, there is too much risk of cognitive loss to have surgery. I have also been taking several supplements for 1 year and keto diet. It seems to help. Also, I am currently reading Jane Mc Lelland's book: How to starve cancer.
Hoping it will help you. Courage. There is always hope.