We don't know, but we can estimate and theorize. Time will tell which theories were close to reality and which ones where not.
Also, Dr. Bosch said:
If we look at the results presentation, what he said wasn’t right. That's maybe why he said "I think" and he didn't assure that.
It was wrong because actually the 7 IDH-1 mutated where not from the 331 ITT population, but from the 232 nGBM arm:
232 * 3% = 6.96.
See the 3% below in yellow:
Also, there were 2 more IDH1 mutated patients in the rGBM treatment arm:
3% x 64 = 1.92.
See the 3% below in yellow:
So we have at least 9 IDH1 mutated patients in the trial, plus the ones in the 35 group, which I think are going to be present in a higher percentage than 3% because of the reasons I explained in previous posts.