Thank you for going through the in depth analysis. I don't know that your numbers were as convincing as you proposed. We simply don't know. We don't know when the IA was triggered, if it has been triggered. We also don't know the mPFS or survival curve of the placebo arm of the study. You mentioned that the UCLA study said it was 8.1 months, but that wasn't a controlled study. In fact, they didn't tell us anything specific about the comparison population.
Here are some factors that I think will make comparisons or analysis difficult.
1. The study is only accepting patients with KPS of 70 or above. Historically available information about survival of GBM don't show anything about how patients in this population survive, but one can assume that they survive longer than the typically published mPFS.
2. Patients in this study were excluded from the treatment arm if they had tumor regrowth etc between randomization and first treatment. Many of these patients landed in the information arm, but many simply stopped treatment. Note that published numbers for mPFS would include those patients, and the fact that they are excluded means the mPFS for this study should be higher.
3. Patients in this study in the placebo arm were allowed to crossover to the treatment arm if the progressed early. If they switched, and the vaccine works for them that could result in a progression event, but it isn't clear to me from the trial design it would.
4. We simply don't know the ages of the people recruited into the study, or how they were randomized into different groups. While GBM usually occurs mostly in older patients, a younger group in this study would result in longer mPFS since age has been shown to be inversely related to survival. Any imbalance in how patients are randomized between the two arms would further change this effect.
In the end, it is simply better to just wait with bated breath.