The longer the better
Time is on our side.
If GBM is active it kills rapidly and without mercy.
This compound failed and trial was interrupted after early. Drug regiment was 3 weeks on drug one week off. 1 cycle = 4 weeks.
Most patient stopped after 1st cycle, longest treated patient was 3 cycle or about 3 months.
https://www.aishealth.com/Bnow/hbd031009.html
If a compound doesn't work for GBM, failure is known after 1st month and probably confirmed at 3 months.
Most 4601 patients are now beyond 1 months and most have ended or going to end 3 months of treatment.