Ross Moat
Analyst · JP Morgan
Thank you, Sanj. I'm pleased to share further details on our fourth quarter and full year 2022 commercial performance, and our plans for continued growth in recurrent pericarditis. Throughout the year, we continued to deliver solid sequential quarter-on-quarter growth of ARCALYST revenue. The growth in Q4 resulted in a net revenue of $39.9 million, representing approximately 20% sequential growth versus the prior quarter. This means our full year 2022 net revenue was $122.5 million. Our team has continued to activate an ever growing prescriber base and there are now more than 800 unique prescribers for recurrent pericarditis since launch, which is a growth of more than 100 additional new prescribers every single quarter. We continue to hear from both prescribers and patients that they are having a positive experience with ARCALYST, and this is resonating in the repeat prescriber rate where considering we have a larger overall prescriber base, we have maintained about 22% of the total prescriber base who have written for two or more patients. Slide 8 outlines some of the key metrics and drivers of the ARCALYST growth. Since launch, we've been laser focused on the 14,000 target population of recurrent pericarditis patients who have had two or more [plans]. By the end of 2022, we have achieved $122.5 million in net revenue by activating approximately 5% of this target population on ARCALYST treatment. This penetration demonstrates that ARCALYST is being well received. We have meaningful and growing revenue and we continue to have a significant opportunity ahead of us. The payer approval rates in Q4 remains greater than 90% of all completed cases as it has been every quarter since launch. Another important driver of growth, which I will highlight in more detail on the next slide is duration of therapy, which is currently at approximately 18 months in total. Additionally, compliance continues to be strong with greater than 85% with refills generally completed on time, highlighting that once a patient starts on therapy they see the benefits and stay adherent throughout the duration. Our gross to net also continues to be very healthy and 9% overall in 2022. All these metrics points in the direction of a successful progressive commercial launch with significant room for substantial growth, and we're extremely excited by what we can achieve with this franchise. I'd like to take a moment to highlight the total duration of therapy metric I mentioned on the previous slide. As we follow more patients over longer periods of time, we believe the average total duration of therapy is now at approximately 18 months. This may continue to evolve but what we're seeing in the commercial setting is that initially patients are staying on treatment for around 12 months and then a high proportion approximately 45% are restarting treatment fairly quickly after trial and stop. This reflects what we know about the persistence of the disease where 60% of multiple recurrence patients suffer for two years and from our clinical data showing that continuous treatment with ARCALYST throughout the disease results in the long term prevention of flares. We acknowledge that treating this debilitating and complex disease with ARCALYST requires an evolutionary mindset and practice for cardiologists. Whereas the focus in the past was aimed at minimizing treatment duration, in particular with steroids due to their toxicity burden and potentially worsening and prolonging the disease. But now with ARCALYST the aim is to treat continuously throughout the duration of the disease and we are rapidly advancing the education on this to cardiologists across the US. Our commercial launch strategy has been successful and now we are continuing to execute and enhance this strategy to reach many more patients in 2023 and beyond. We're focused on a dual approach of continuing to broaden our base of prescribers as well as deepening the depth of repeat prescribers. At the end of last year, we expanded our sales force to around 50 sales representatives, which we believe will enable greater core frequency with our target doctors as well as broaden our reach overall. We understand the importance of having multiple calls on our target base and how to provide the education needed to ensure cardiologists become comfortable with addressing the root cause of recurrent pericarditis by prescribing a targeted biologic therapy. We are planning to make far stronger inroads into digital marketing, having built a patient database of more than 3,000 pericarditis patients where we will advance the education so patients can self-advocate for ARCALYST if and when patients have their next recurrence. Currently, patients are widely spread throughout the country. We plan to lead the charge to support centers who wish to advance their services by focusing on pericardial diseases and creating networks of local referrals to centers who specialize in the management of these diseases. We also want to be at the leading edge of evidence generation. For example, with our longitudinal registry called RESONANCE, which is focused on the severity and burden of the disease, as well as understanding and educating further on the outcomes associated with appropriate disease management. And turning to Slide 11, our efforts on commercializing the first and only FDA approved drug for recurrent pericarditis has resulted in a cracking launch, with hundreds of patients gaining access to therapy. The next stage for us is to dig much deeper into the opportunity. We believe we have built strong foundations that do just that. Our data are exceedingly compelling. We have an ever growing prescriber base. Physicians and patients are reporting positive experiences with ARCALYST, and we have an excellent field team who are executing our strategy brilliantly. Looking to 2023, we expect to grow our ARCALYST net revenue to between $190 million and $205 million. This would represent a significant year-on-year growth of greater than 60% at the midpoint of that range. We're delighted with our current commercial performance and are very excited about the growth we have ahead. With that, I'll hand over to Mark to cover our financial results.