Exactly right, the longer the trial goes the better the chances of efficacy. We do not want any AEs attributed to K or early DLTs. The further the cohort progression without MTD, the better.
That said, its hard to fault the wish expressed by many here (myself included) that we might see a pre or post ASCO PR with miraculous early activation of P21 announced, given the "early Qpcr tests" combined with excellent pre-clinicals.
I'm content to let the graph lines start to accelerate upwards at cohorts 6-7 for K, and the P trial will be getting started in a few weeks.
What if they do not see any DLT's from increased dosage but also no improved results. Do they ever reach a point where they say enoughs enough and arbitrarily set the MTD way above the efficacy dosage at the level where they decided to stop the trial?
Why go an additional 6 months or so if the higher dosages don't do any better than lower dosages that work?