Ying Huang - Bank of America Merrill Lynch
Analyst · Ying Huang from Bank of America Merrill Lynch
Hey, thanks for taking my questions. First of all, the results you just released last month from the 12 weeks Phase 2b for VX-661 in homozygous patients, based on that 2% absolute change between placebo and drug, does that change your view of the likelihood of success for this combo in heterozygous, or you called the het min patients? And then secondly, philosophically, how high do you think the barrier to entry for your competition is? It seems that everyone else is also developing drugs using your HP assay. So, I was wondering what your view is for the competition that's coming on the way? Thanks.
Jeffrey M. Leiden - Chairman, President & Chief Executive Officer: Yes, let me answer the second one first. Of course there is now increasing competition. That typically is what happens when you show the kinds of success that we've shown. I think the strategy that we're taking is to as quickly as possible find the maximal regimens and get the most patients we can on them. We do think we have a pretty considerable head start. Most of these other assets are preclinical or just entering the clinic. And so as I told you, for the reasons I've told you, we're confident that for instance a three drug regimen will allow us to address 80% to 90% of the patients and get essentially maximal effects. And that does of course provide a barrier to entry, both in terms of even enrolling clinical trials and certainly in terms of commercially once you're already there. So that's really the competitive strategy. And it's supplemented by our business development strategy as Ian said. So if some of those assets come from externally and we can put them together into even better combinations, all the better for patients and of course for us. On the first question is really, what's our confidence around 661. And as I said, the FEV1 response that we saw in that study and in the delta-F508 homozygous patients was pretty comparable to what we've seen in the other Phase 2 studies. So if anything, that increased our confidence in the effects we're seeing since it went through 12 weeks. I'd also remind you that there is a lot of other Phase 2 data out there. For example, adding 661 to patients who are on KALYDECO who have a gating mutation, in which in a Phase 2 study we showed I think about a 4.6% further increase in their FEV1, and of course that's become a part of our Phase 3 program. I think one of the key questions that we have and that others have is, what is the likelihood of success with the two drug combination, 661 plus KALYDECO in the heterozygous min population, the really most difficult population to treat. And as we've said before, we think that has a lower probability. We haven't actually tested the drug yet there. But on the other hand, those patients have nothing today. So the way we're managing that in the Phase 3 program is there is a separate study in that population, but it looks quite different. And we're going to enroll a reasonably small number of patients, about 120, and then we're going to do a futility analysis based on those 120 to decide whether to continue and enroll another 150, which would give us the full pivotal trial. So it allows us to manage the risk there, if you will, while we're also bringing forward of course the next generation correctors that we think have a higher likelihood of success in that population.