Andrew A. Wolff
Analyst · Jason Butler
Thank you, Fady. I'm pleased to provide an update on recent developments in our skeletal muscle program. First, we've made solid progress in enrolling BENEFIT-ALS, our ongoing Phase IIb clinical trial of our fast skeletal muscle troponin activator, tirasemtiv. BENEFIT-ALS is a multinational double-blind randomized placebo-controlled clinical trial designed to evaluate the safety, tolerability and potential efficacy of tirasemtiv in patients with ALS. Let's start with the enrolment of BENEFIT-ALS. During our last earnings call on April 30, I announced that approximately six months after we dosed the first patient in BENEFIT-ALS, we had enrolled over 200 patients in the trial. Today, three months later, I am pleased to announce that we have enrolled over 500 patients in BENEFIT-ALS. The raised enrolment in this trial is a testament to the dedication of ALS patients, their caregivers, and BENEFIT-ALS clinical side personnel and investigators. We are grateful for their commitment to this trial. We at Cytokinetics and our colleagues in eight countries are working to ensure that BENEFIT-ALS progresses efficiently to inform us regarding the potential safety and efficacy of tirasemtiv during three months of treatment of patients with ALS. Along the way, we did suffer a setback. As we announced earlier this month, through our routine inventory management procedures, Cytokinetics detected an imbalance between supplies of tirasemtiv and placebo. Soon afterwards, we determined that a programming error in the electronic data capture system controlling study drug assignment implemented during the course of this study caused 58 patients initially randomized to and treated with tirasemtiv to receive placebo instead at a certain study visit subsequent to randomization and for the remainder of the study. No patients randomized to placebo received incorrect treatment. Once the error was detected, we took immediate steps to ensure that no further incorrect study drug assignments occurred and to correct the programming error. In addition, we convened the study’s Data Safety Monitoring Board or DSMB to assess whether this error had impacted the safety of the 58 affected patients. After review of the relevant data from BENEFIT-ALS, the DSMB reported no safety concerns regarding those 58 patients or any other patient safety. At that point, over 450 patients had been enrolled into BENEFIT-ALS and over 100 had completed 12 weeks of treatment. Despite the error, Cytokinetics and all clinical trial site personnel remained blinded to the specific patients affected by the error although we do know that they were enrolled across multiple countries. As Robert mentioned, following consultation with experts, clinicians and regulatory consultants, we've proposed to development regulatory authorities including of course FDA our plan to preserve the scientific value of BENEFIT-ALS. Following interactions with these regulatory authorities, we amended the protocol to exclude from the primary efficacy analysis not only the 58 affected patients but all patients randomized in any permutation block that included any of the affected 58 patients, regardless of treatment assignment. We believe that approach is appropriately conservative and ensures that all patients included in the primary analysis will have been randomized concurrently between the two treatment groups. In order to maintain the originally intended statistical power, we also amended the protocol to increase the overall target enrolment in BENEFIT-ALS to approximately 680 patients in order to replace the patients in permutation blocks now excluded from the primary efficacy analysis. As I mentioned, to date, we have enrolled over 500 patients into BENEFIT-ALS and expect enrolment to continue as the new amendment becomes effective at the participating study centers. We now expect a complete enrolment in BENEFIT-ALS during the second half of 2013. We expect to announce when enrolment has completed, and in anticipation of potential positive results from BENEFIT-ALS, we are preparing for next steps in this program. In the meantime, I will now turn to CK-107, our next generation fast skeletal troponin activator. In the last quarter, we continued to enrol patients in CY 5011, a Phase I first-time-in-humans clinical trial of CK-107 in healthy male volunteers, which is now conducted by Cytokinetics as part of our collaboration with Astellas. CY 5011 is a double-blind, randomized, placebo-controlled study designed to assess the safety, tolerability, and pharmacokinetics of single ascending oral doses of CK-107 administered to healthy adult males in a three-period dose escalation crossover design. CK 5011 is enrolling well and proceeding to higher dose cohorts. In addition, we are planning to initiate other Phase 1 and Phase II readiness activities specified under our development plans for CK 107 agreed with Astellas. Under that plan, Cytokinetics will be primarily responsible for the conduct of Phase I clinical trial including the completion of Company 5011 and we will conduct certain Phase II readiness activities for CK-107. Astellas will reimburse our agreed costs under the plan and will be primarily responsible for the conduct of subsequent development and commercialization of CK-107. Recent progress with CK-107 in Phase I together with our new collaboration with Astellas should enable Cytokinetics now to increase our commitment to the investigation of CK-107 in non-neuromuscular conditions associated with muscle fatigue and weakness. We are excited to expand and accelerate this program under our collaboration with Astellas in this emerging and promising area of pharmacology. With that update on the clinical development activities, I'll turn the call over to Sharon.