Jim Dentzer
Analyst · Cantor Fitzgerald. Please go ahead
Yes. It's a great question. So let's step back in time, just as a reminder, when the FDA put us on hold in the spring, they had three fundamental questions. The first one was there was a patient who died and they wanted to make sure that, that wasn't an issue with the drug or the study in any way. And then second, they knew that we had an early signal, it was rare, but a signal in CPK elevation in rhabdo. They wanted to make sure that wasn't a problem in the index patient, in the patient death or in any other patients, make sure that they didn't need to change our protocol in any way. Are we identifying and managing CPK elevation in rhabdo appropriately. And then third, they asked us about dose, Project Optimus, which dose is the right dose taking the recommended Phase 2? So we were able, over the course of the summer. We said this in the beginning, and I'm glad, of course, to be able to say now that it worked out that way. The FDA was going to get comfortable as we were as they learned more about the patient death that this is a patient with relapsed/refractory AML who had a life expectation of 2.3 months in the literature. That patient died in month nine. Our view would be that patient – the question shouldn't be, why did the patient die? The question should be, how did that patient get to month nine? And the answer is, of course, the drug. The patient eventually did progress and the FDA, of course, got comfortable with that as they reviewed more data. The second question was on CPK elevation in rhabdo. We do know it is rare to see it in our study, but we do see it. We do know that our drug can exacerbate a CPK elevation in some patients. We do know that there are confounding factors and we were able to identify them in the data with FDA. If you're on a statin, if you're on a fibrate, if you're a heavy exerciser, you will see CPK elevation, but when you know exactly what to look for, the protocol has really good language for identifying it, training the patients doing blood draws to see if there is a CPK elevation and the procedures are in the protocol for managing effectively, and we didn't have any patients have renal complication, which was obviously terrific. The FDA reviewed all of our procedures and all of our data and of course, got comfortable with that as well. It was the last question on dose and this is really getting to answer your question directly, that the FDA was able to focus on the most and would involve most of the discussion. In the context of Project Optimus, where the FDA wants to know and be involved in which dose moves forward in drug studies. Emavusertib represents an ideal drug for that purpose. We studied and cleared for safety purposes, 200 milligrams, 300 milligrams and 400 milligrams and all three dose levels got responses. That's the perfect place for FDA to want to sink their teeth in. Now we came back, suggesting that between 300 and 400, there was no efficacy increase but there was a risk that there might be some off-target effect. We were saturating the target of 300, so it didn't make sense to go to 400, 300 was better between those two. Between 200 and 300, we feel as though when we run our exposure analysis, there is a higher probability of getting a response of 300 milligrams and therefore, 300 is better than 200. And the FDA said, okay, we appreciate that logic. That makes sense. We'd just like to see a few more patients at that lowest dose level to make sure we agree. And so the negotiation with FDA was all about how many more patients do you need to be able to see to help us decide is 200 or 300 the appropriate recommended Phase 2 dose, and we agreed on the number nine. So we're going to spend the next – this quarter, of course, now that we're open for enrollment where the blocking and tackling is in process of getting all of our sites open. And then, of course, we're going to quickly move into enrolling those nine additional patients. And my hope would be that sometime early to mid next year, we've got those patients on study. We can run the analysis on them, build the briefing book and have that discussion with FDA and one of two outcomes is going to happen. Either the data is going to come back exactly the way we thought and the way the early data suggested and 300s or dose and FDA will agree or frankly, we are wrong. And when we put nine more patients on it 200 milligrams, we get a bunch of CRs at 200 milligrams. In which case, you know what the FDA turned out to be right or at least the question turned out to be valid. And we will then move forward with 200 milligrams as our dose. But we should know that sometime by mid next year would be my guess. That’s a really long answer, but I wanted to make sure to address it thoroughly. Did that help?