Why Phase 1a & 1b won’t be run in parallel10 Jul 2023 19:10
In response to Wyn’s earlier query, this is the reason given at the AGM for NOT running AVA6000 phase 1a & 1b in parallel.
Alistair Smith
“In terms of the Phase 1b, we still have to complete the Phase 1a, and I'm sure there'd be a question about that. But you know, it makes it makes no sense to start an efficacy study when we don't know what the dosing should be in that efficacy study. It would be a reckless use of funds to start what could be a suboptimal Phase 1b.”
AS later read out a submitted online question:
“Given AVCT suspect they have found their RP2D already. Why isn't Phase 1a and Phase 1a B being run in parallel? Other companies do so, eg Shasqi. So given the importance of speed to market why has Avacta not taken this approach?”
Answer from AS
“Okay, so there's obviously a very good answer for that. I don't think we should be suspecting that we found our RP2D by the way. I don't think that would pass muster when we move forwards. And we certainly haven't made any decisions on what our dosing levels or dosing regimen should be for the Phase 1b at this point. But the substantive question is why don't we run Phase 1a and Phase 1b in parallel? And that question has been asked a lot, so it's useful to deal with that one. And I think I touched on it when I was speaking. So to say other companies do so, Andrew, correct me if I'm wrong, that's not true. I mean, it's a rare occurrence that companies go into an efficacy study without having completed the dose finding phase of the work.
I have no idea why Shasqi took that approach. Presumably is a sensible reason for that, but in my opinion, certainly the team's opinion, it would be reckless to go into a Phase 1b which was potentially suboptimal because we don't know how high a dose we can give, and to then spend a considerable amount of money doing that and run the risk of not getting the outcome that we want. All for the sake of waiting for another cohort or two, whatever it turns out to be. So the answer to the question is yes, it's true to say that companies have very occasionally in the past run these two types of studies in parallel. That's not appropriate for us.”
Andrew Saunders was in agreement with AS and concluded his answer by saying:
“So you can either rush to a suboptimal dose and maybe failure or you can do it in a more rigorous way. Which I think we are doing, the more traditional way, but do it as steadily and as fast as you can do. But choose the optimal dose and schedule because once that is done, it's really difficult to go back.”