Stuart Kupfer
Analyst · Joe Pantginis with H.C. Wainwright
Thanks, Fady. During the third quarter, in September we presented the full results from Cohorts 1 and 2 of REDWOOD-HCM the Phase 2 clinical trial of aficamten at the Heart Failure Society of America Annual Scientific Meeting in Denver. As we've mentioned, the results were positive and support our advancing aficamten to Phase 3, which I'll touch on in a moment. As we previously shared in REDWOOD-HCM treatment with aficamten for 10 weeks resulted in statistically significant reductions from baseline, compared to placebo in the average resting left ventricular outflow tract for LVOT pressure gradient and the average post-valsalva at LVOT gradient. The majority of patients treated with aficamten 79% in Cohort 1 and 93% in Cohort 2 achieved the target goal of treatment defined as resting gradient less than 30 millimeters of mercury and post valsalva gradient less than 50 millimeters of mercury at week 10 compared to 8% for placebo. These reductions in LVOT gradient were dose-dependent with patients achieving greater reductions of LVOT gradient with increasing doses of aficamten. Reductions in LVOT gradient occurred within two weeks of initiating treatment were maximized within two to six weeks of the start of dose titration and were sustained until the end of treatment at 10 weeks. Reversibility of LVOT gradient and they'll be ejection fraction reductions were observed after discontinuation of aficamten with levels returning to baseline at the end of the two-week washout period. Patients also experienced statistically significant reductions in NT pro BNP and treatment with aficamten was associated with an improvement in New York Heart Association functional class with a substantial number of patients, improving by at least 1 class. As previously stated treatment with aficamten was well tolerated. The incidence of adverse events was similar between treatment arms. And there were no treatment-related serious adverse events. Importantly, there were no treatment interruptions or discontinuations Director of hypertrophic Cardiomyopathy Center at Tufts University School of Medicine who presented the results of REDWOOD-HCM at HFSA underscored the potential clinical utility of aficamten based on the elimination of resting LVOT gradients in nearly all patients. Dr. Maron further commented on the substantial improvement in heart failure symptoms, rapid onset and reversibility of effect the ability to use precise echo-guided titration and the lack of dosing interruptions for low ejection fraction. At the conference, we also received a positive reaction from physicians who manage patients with HCM and expressing their enthusiasm about the results and for a medication that potentially could be used for patients who have symptomatic obstructive HCM and are not responding to current standard of care therapies. Overall, we're very encouraged by the results so far and their potential translation of the clinical practice. During the quarter, we also completed enrollment in Cohort 3 of REDWOOD-HCM in which patients with obstructive HCM who are receiving disopyramide as background therapy are treated with aficamten in an open label manner. This cohort will further inform the potential inclusion of this small, but important patient population in our planned Phase 3 trial. In addition, during the third quarter, we continued enrolling patients in REDWOOD-HCM OLE the open label extension trial of REDWOOD-HCM. With the positive results in hand from REDWOOD HCM, we have been actively engaging and startup activities for SEQUOIA-HCM our planned Phase 3 clinical trial of aficamten in patients with obstructive HCM. At our Analyst and Investor Day meeting in October, we presented the design of the trial, which I'll recap at a high level now. SEQUOIA-HCM is a randomized double-blind placebo controlled international clinical trial designed to evaluate aficamten in patients with symptomatic obstructive HCM on background medical therapy for 24 weeks. The primary objective is to evaluate the change from baseline to week 24 in peak oxygen uptake or peak VO2 measured by cardiopulmonary exercise testing or CPET which is a measure of exercise capacity among the secondary objectives. We are investigating the change in Kansas City Cardiomyopathy Questionnaire clinical symptom score in New York Heart Association functional class at Week 12 to evaluate a potentially early improvement in heart failure symptoms and again at week 24. We plan to randomize 270 patients in a one-to-one ratio to aficamten or placebo in addition to standard of care. Each patient will receive up to four escalating doses of aficamten or placebo. With dose optimization based on achievement of echocardiographic targets the starting dose will be 5 milligrams once daily. Escalating to 10, 15 or 20 milligrams once daily as needed to achieve target gradients. These four doses were selected based on the results from REDWOOD-HCM to facilitate selection of the optimal dose for each patient and maximize the individual benefit risk profile. Study startup activities, regulatory filings and IRB submissions are underway. With the first site initiations already completed drug product availability and early 2022 will enable the commencement of screening and enrollment of the first patients in this trial. In anticipation of enrolling patients with obstructive HCM from China in SEQUOIA-HCM we continue to collaborate closely with our partner Ji Xing Pharmaceuticals. Ji Xing recently completed a Phase 1 study evaluating single and multiple doses of aficamten in healthy Chinese subjects. The pharmacokinetic results were similar to those observed in the Caucasian populations enrolled in our Phase 1 study of aficamten conducted in the U.S. and similarly showed dose proportional pharmacokinetics with a safety and tolerability profile comparable to placebo. The results of this study support submission of the clinical trial application and enrollment of patients with obstructive HCM in China. On the neuromuscular front as Robert mentioned, during the third quarter, we began enrolling patients encourage ALS the Phase 3 clinical trial of reldesemtiv in ALS. COURAGE-ALS will enroll approximately 555 patients with ALS randomized 2 to 1 to receive reldesemtiv or placebo for 24 weeks, followed by a 24-week period in which all patients will receive reldesemtiv. The primary endpoint is the change from baseline to 24 weeks in ALSFRS-R, a functional rating scale that indicates the progression of ALS. As we designed COURAGE-ALS, we incorporated feedback from patients and caregivers to remove key barriers to clinical trial participation and to help make the patient experience less burdensome. We are also working to provide continued access to reldesemtiv for all patients who complete COURAGE-ALS as well as patients who have previously participated in our ALS trial reflective of our goal to ensure ethical and equitable access for patients who are in need. With that, I will turn the call over to Andrew to discuss our progress against the go-to-market strategy for omecamtiv mecarbil.