Cytokinetics Announces Presentation of Additional Results From COSMIC-HF at Heart Failure 2016 Congress

Treatment with Omecamtiv Mecarbil Produced Progressive and Sustained Effects On Cardiac Function as Measured by Reductions in Diastolic Ventricular Volume and NT-proBNP SOUTH SAN FRANCISCO, Calif., May 23, 2016 (GLOBE NEWSWIRE) -- Cytokinetics, Inc. (Nasdaq:CYTK) today announced that additional results from COSMIC-HF (Chronic Oral Study of Myosin Activation to Increase Contractility in Heart Failure), a Phase 2b trial evaluating omecamtiv mecarbil in patients with chronic heart failure, were presented in a poster titled “COSMIC-HF: Improved Contractility and Evolution of Ventricular Remodeling through Time” at Heart Failure 2016, the annual congress of the Heart Failure Association of the European Society of Cardiology, in Florence, Italy.  The results presented showed that omecamtiv mecarbil improved left ventricular (LV) systolic function, LV end-diastolic volume and NT-proBNP over time, suggesting potentially favorable ventricular remodeling and progressive reduction in myocardial wall stress. Omecamtiv mecarbil, a novel investigational cardiac myosin activator that increases cardiac contractility, is being developed by Amgen in collaboration with Cytokinetics for the potential treatment of heart failure. “For the first time, we have evidence that increasing cardiac contractility by chronic treatment with omecamtiv mecarbil may result in a progressive reduction in ventricular size,” said Fady I. Malik, MD, PhD, Cytokinetics' Executive Vice President, Research and Development. “We are preparing for a potential Phase 3 program in collaboration with Amgen in which we would learn if these effects on cardiac function are durable over longer periods of treatment and may also translate to improved cardiovascular outcomes.”   COSMIC-HF: Expansion Phase Design and Results   The expansion phase of COSMIC-HF evaluated the pharmacokinetics, pharmacodynamics, safety and tolerability of oral omecamtiv mecarbil in 448 patients with chronic heart failure and left ventricular systolic dysfunction. Patients were randomized 1:1:1 to placebo, to omecamtiv mecarbil 25 mg twice daily, or to a dose titration group in which an initial dose of 25 mg twice daily could be increased to 50 mg twice daily depending on the plasma concentration of omecamtiv mecarbil after two weeks of treatment with the 25 mg twice daily dose. Data from the expansion phase were presented as a Late-Breaking Clinical Trial at the American Heart Association’s Scientific Sessions in November, 2015 and showed that this dose titration strategy maintained concentrations of omecamtiv mecarbil within a range associated with potentially beneficial pharmacodynamic effects avoiding excessive concentrations. Placebo-corrected data from the dose titration group are shown in the table below.  Increases in systolic ejection time (SET) and stroke volume, and decreases in LV end-systolic volume, were similar after both 12 and 20 weeks of treatment with omecamtiv mecarbil; however, LV end-diastolic volume decreased progressively from 12 to 20 weeks, with the decrease after 20 weeks nearly twice that observed after 12 weeks.  NT-proBNP (a biomarker that is elevated in heart failure, with higher elevations reflecting more severe heart failure) also fell progressively over time and, of particular note, had declined even further four weeks after treatment discontinuation (‑1306 ± 376 pg/mL; p=0.0006).  Heart rate also declined significantly after 2, 12 and 20 weeks of treatment ranging from 2-4 beats per minute and returning nearly to baseline four weeks after treatment discontinuation (-1.2±1.2 beats/min: p = 0.29). Endpoint Baseline* Changes from Baseline* (p value for change on omecamtiv mecarbil vs. placebo) 2 Weeks 12 weeks 20 weeks  Systolic Ejection Time (msec) 298 ± 333 Not measured 22 ± 3 (p < 0.0001) 25 ± 3 (p < 0.0001)  Stroke Volume (mL) 52.4 ± 14.9 3.2 ± 1.6 (p = 0.038) 3.6 ± 1.6 (p = 0.022)  LV end-systolic volume (mL) 157.1 ± 77.7 ‑9.9 ± 3.8 (p = 0.009) -11.2 ± 3.9 (p = 0.005)  LV end-diastolic volume (mL) 215.9 ± 88.8 -5.8 ± 4.2 (p = 0.17) -10.7 ± 4.6 (p = 0.021)  NT-proBNP (pg/mL)  (Baseline is median [Q1, Q3]) 1719 [881, 3060] ‑302 ± 204 (p = 0.14) -623 ± 364 (p = 0.087) -970 ± 357 (p = 0.007)  Heart rate (beats/min) 70 ± 12 ‑2.2 ± 0.8 (p = 0.007) -4.0 ± 1.0 (p < 0.0001) -3.0 ± 1.1 (p = 0.007)  *mean ± SD unless otherwise noted

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