Dr. Bill Sheridan
Analyst · Jefferies. Your line is now open
Thank you, Jon. With APeX-2 enrollment now completed, I’d review the details of this study and discuss the exciting implications of the clinical profile we see emerging for 7353. The design of the APeX-2 trial was shown on Slide 12 was informed by the outcomes of our APeX-1 Phase 2 trial which were recently published in New England Journal of Medicine and are in fact two discussions with FDA and EMA. APeX-2 is a randomized double-blind placebo control three arm trial testing to two dose levels of once daily oral 7353, 110 mg and 150 mg, the prevention of angioedema attacks in patients with type 1 and type 2 hereditary angioedema. The primary efficacy endpoint of APeX-2 is the rate of angioedema attacks over 24 weeks of blinded study drug administration. The pace of enrollment in APeX-2 was much faster than either we or our investigators had anticipated. In fact, we over enrolled the study with 121 patients randomized in the United States, Canada and Europe, about two-thirds of those from North America. As a result, the final sample size results in overall power of 99%. We had originally planned to enroll 96 patients, which would have provided 90% power. The robust enrollment in APeX-2 is yet another strong indicator to us that patients want an oral option to control their disease. Our long-term safety study APeX-S is also seeing very strong enrollment. We added up both APeX-2 and APeX-S, we have already met the goal of at least 100 subjects enrolled at each dose level of 7353 in order to support safety analysis for the NDA. We look forward to completing follow up through 48 weeks, and we remain on target to submit the U.S. NDA in the fourth quarter of 2019 followed by a European marketing implication in early 2020. As Jon noted, we are already hard at work on the core sections of the NDA. We look forward to completing the clinical trial program for HAE prophylaxis and to advancing the first targeted oral therapy to launch. Turning to our acute treatment program, we're very pleased that the ZENITH-1 trial is now fully enrolled. With the success of the 750 milligrams single-does cohort, we're moving quickly to complete data collection for the additional dose on ZENITH-1 and commence the Phase 3 study. We plan to meet with regulators in the summer of 2019 to discuss the Phase 3 trial design, and to begin that trial after mid-year. What's been especially exciting about the clinical outcomes in ZENITH-1 is that the results validate at PKPD profile, showing both a rapid onset of clinical activity from the self-assessment time post dose one hour and sustained benefits over 24 hours. From both the clinical and patient perspective, these are both critical attributes because the treatment paradigm for acute attacks has changed completely since the prior licensing trials for acute treatments were conducted. From intervening many hours after an attack in a hospital setting or a clinic, to immediate self-administered treatment in order to limit the progression of the attack. You can see this dramatic shift illustrated on Slide 17, which compares the study parameters of ZENITH-1 for the study parameters in other acute trials. Instead of injectable treatment in the clinic, subject in ZENITH-1 self-administered oral 7353 at home. Instead of 4 to 12 hours of symptoms before study drug treatment, instead of finding all subjects treated within one hour of onset symptoms infect the median was 35 minutes. As shown in Slide 18 through 21, our results in Zenith-1 showed clear cut clinical benefits and a dose that's generally safe and well tolerated. 7353 was discovered and developed by using the disciplines of structural biology and structural based drug design in order to meet an urgent medical need for a targeted oral treatment for a rare disease. Oral treatments for rare diseases are very hard to combine. Fortunately, our research team in Birmingham continues to invent and progress new oral product candidates in other rare disease settings and we are very excited to be progressing two non-clinical programs in separate disease areas. One of these diseases is Fibrodysplasia ossificans progressive or FOP, a very rare condition that results in irregular formation of bone in muscles, tendons, and other soft tissues, resulting in devastating loss of function deformity and early mortality. There are currently no approved treatments for this disease. We have advanced two compounds into life pre-clinical development which work to inhibit the mutated ALK2 kinase that is responsible for this disease. For competitive reasons, we have not yet disclosed the molecular target or indication we plan for our second non-clinical programs. Unlike FOP, this undisclosed condition is more prevalent and it can be treated by repeated IV infusions. The treatment could be fundamentally transformed with an oral drug. We are very excited by what we are seeing emerge pre-clinically. It's a very active time for us at BioCryst as our pipeline progresses. The clinical data with 7353 continues to reinforce the attractive profile as an oral kallikrein inhibitor that can be safely and effectively used to prevent and treat HAE attacks, meeting an urgent patient demand for a targeted oral therapy. Now I'd like to turn the call over to Lynne, to further describe this patient demand from a commercial perspective.