My mother also had a glioblastoma. This was nearly 20 years ago, and the the doctors didn't recommend any treatment at all. They gave her two months to live after the diagnosis, and she passed away quietly at home two months later. We wondered at the time if treatment would have helped, but it appears there was nothing that could have been done.
My mom lived six months and one day from the night she went into the ER. A neurologist who was treating mom proclaimed, matter of factly, that she had 'less than six months.' She was in a coma the last couple of months but my dad and I truly believed that she had to prove the doc wrong. Coincidently, my mom was 1st generation, Irish and she (like Mayor O'Connon) had striking snow white hair. I know hair color means nothing, but when I read of the Mayor's diagnosis, I just thought of the similarities.