I have had three close relatives die from Glioblastoma Cancer - There were treated at some of the top hospitals in the US. Every case we heard the same story from the Doctors - “we are close to finding a drug that will slow the spread of the cancer” There is still no drug that works on stage 4 Glioblastoma. Stage 4 remains a death sentence.
I am so sorry to hear about your family passing.
Sadly, stage 4 of virtually every cancer is still a death sentence.