Tim Van Hauwermeiren
Analyst · Derek Archila from Wells Fargo. Your line is open
Good morning. And thank you for joining our call today. We had a truly monumental 2021 and ended the year with the FDA approval of VYVGART, a first of its kind FcRn blocker for the treatment of generalized myasthenia gravis in adult patients who are acetylcholine receptor antibody positive. It was a milestone we have been working towards for many years and we were so gratified to be able to honor our commitment to patients by bringing them a new treatment option. The regulatory momentum continued into 2022 with a subsequent approval of VYVGART in Japan just 34 days later. I cannot emphasize enough the work it took for our teams to make this happen seamlessly. I want to start our call today talking about our launch. During these first weeks, we have focused primarily on demand generation through education and awareness efforts. Keith will share some metrics later in the call but we still have a lot to learn about our launch trajectory in the coming quarters. We are doing our best to characterize the state of the launch today, though it’s fair to say it’s still very early and these are not necessarily metrics we will share on an ongoing basis, especially as we start to provide revenues during our Q1 earnings call in May. I have had the privilege of being on the road with many members of our field team since the start of the launch. At a high level, we are encouraged by the initial demand in our launch, we know that it is still early days, and that we face the same challenges that we described at approval; COVID restrictions, the lack of a J Code, the need for physician education, and better awareness. But eight weeks into the launch, we are cautiously optimistic and trending well against our plans. I have also been encouraged by the feedback I’m hearing firsthand from our physicians, all of which is consistent with many of the messages we shared leading up to approval. On slide four, for example, the unmet needs faced by gMG patients for new therapies is significant and we’ve seen real demand. The challenge for our sales force has been demonstrating its sense of urgency during a time when patients do not see that doctors regularly. We also see physicians rethinking how to treat their patients based on the efficacy and safety profile we demonstrated in ADAPT. And finally, doctors applaud individualized dosing, hence the VYVGART label which allows them the flexibility to dose based on clinical evaluation. In MG where every patient is unique and experience the disease course differently, an individualized approach makes sense to physicians. We believe that the treatment cycle approach will accommodate the majority of our patients. We also want to consider the individual needs of patients that may require alternative or more continuous dosing and to have data, should we get questions from providers on this topic. We started a Phase 3b trial called ADAPT-NXT to evaluate additional dosing schedules that physicians could use to further individualize the VYVGART treatment approach. As this is a typical Phase 3b trial, we will not be providing additional updates on the study outside of an upcoming medical meeting. In general, we want to have the most complete offering for patients and physicians, whether on a dosing schedule or around formulation, IV or subcu. We continue to believe that having both an IV and subcu option will be important to capture variability in patients and physicians preferences. Slide 5, our Phase 3 ADAPT subcu non-inferiority trial is on track to read out this month, evaluating subcu efgartigimod, which is co-formulated with Halozyme validated ENHANZE technology. In this trial, we aim to bridge IV to subcu based on PD effect, specifically IgG reduction at day 29. We designed our innovative bridging trial based on a few key points. First, we observed in our clinical trials a linear correlation between IgG reduction and clinical benefits in gMG. We also see a consistent PD effects with efgartigimod within healthy volunteers or gMG patients. The disease biology of gMG does not affect PD and actually we have seen this in all indications we have studied so far. And finally, in our Phase 1 study of subcu efgartigimod, we observed an identical PD effect with a fixed dose of 1000 milligrams subcu, as with 10 milligram per kilogram IV. Beyond the non-inferiority primary endpoint, ADAPT subcu will capture additional safety, efficacy, and PK/PD data in the secondary endpoint analysis, which will be important for our commercial team. ADAPT subcu also serves to satisfy our safety database requirements for subcu efgartigimod. We enrolled more than the 50 patients required for the primary endpoint analysis and allowed ADAPT open label extension patients to roll over to the ADAPT subcu Q trial. We expect to be able to give you an update on timing of our BLA filing when we report top line results. ADAPT subcu is the first of our near-term data milestones. We also are on track to share results in the second quarter from the ADVANCE trial, evaluating IV efgartigimod in primary immune thrombocytopenia. Slide 6, we designed our Phase 3 ADVANCE trial based on the results from our Phase 2 and benchmarking of peer [phonetic] ITP trials. In our Phase 2, we had ambitiously dosed patients for just four weeks, while monitoring platelet counts out to 21 weeks. We learned from this trial that more chronic dosing is required in this population. Even with a limited drug exposure, we saw responses across patient types in a very refractory ITP population. These results are published in the American Journal of Hematology. We also saw a high placebo response in our Phase 2, which in looking at these trials is very common in ITP, given the fluctuating nature of platelets. In our Phase 3, we are dosing patients weekly for 26 weeks, with the potential to push the cadence to biweekly dosing based on a stable platelet counts. We are measuring the primary endpoint between weeks 19 and 24 where a patient has to have a stable platelet counts, meaning over 50,000 platelets per microlitre, in at least four of those six visits. By managing placebo response with registration endpoints, we’re also setting the efficacy bar high for our treated patients. It will be important to focus on the delta between response in the active and placebo groups. The secondary endpoints will also be important with the ADVANCE readout, including safety and tolerability, cumulative platelet counts, bleeding events, and quality of life data. This will show a more complete picture of where as efgartigimod could play a role in ITP. We hear from physicians that there remains a high unmet need in ITP and that long-term response rates are not satisfactory. Patients typically cycle through treatment options, including through multiple TPOs in order to maintain a stable platelet counts. Our hope is that we can break this cycle and if an ITP patient fails or relapses on an initial TPO, they will be in a position to try efgartigimod before his second or third TPO. You can see that we have a catalyst rich first half of the year between our launch progress and these two data readouts. It’s a busy time, but also a very exciting time to finally have our teams in the field, engaging with physician customers and serving patients. I am going to turn the call to Keith, who will provide more details on the VYVGART launch in the US.