RE: Why Phase 1a & 1b won’t be run in parallel11 Jul 2023 20:29
You need to understand what mtd is, simply max safe dose, the upper edge of the envelope of dosing regimes. You're talking about something more like a biologically effective dose which is the fall back position.
Note that on one of the slides it was noted how much was needed for 4 different mechanisms. So there are 4 effective dose levels they'd need to hit, the highest of which was met in de4 I think. But without knowing the mtd you are not going to know how high you can go, and it's quite possible that it becomes more effective at higher doses, doses that have been unachievable with std dox as its too unsafe.