Tenaya Therapeutics Presents Promising Interim Clinical Data from MYPEAK™-1 Phase 1b/2a Clinical Trial of TN-201 Gene Therapy for the Treatment of MYBPC3-Associated Hypertrophic Cardiomyopathy

Core Insights - Tenaya Therapeutics presented new interim safety and efficacy data for TN-201 during the AHA Scientific Sessions 2025, indicating promising results for patients with MYBPC3-associated hypertrophic cardiomyopathy (HCM) [1][3][7] Group 1: Clinical Trial Overview - The MyPEAK-1 Phase 1b/2a clinical trial is assessing the safety and efficacy of TN-201, a gene therapy for HCM, with two cohorts receiving different doses [9] - Cohort 1 patients showed consistent improvements in hypertrophy measures over a follow-up period of 52 to 78 weeks, while initial data from Cohort 2 indicated early dose-responsive increases in TN-201 transduction and MyBP-C protein expression [1][4][5] Group 2: Safety and Tolerability - TN-201 was generally well tolerated at both tested doses (3E13 vg/kg and 6E13 vg/kg), with no dose-limiting toxicities observed [2][6] - The most common treatment-related adverse events were reversible, asymptomatic liver enzyme elevations, with no signs of cardiotoxicities reported [6][12] Group 3: Efficacy Results - Significant reductions in cardiac biomarkers were observed, with Cardiac Troponin I levels declining by 48% to 74% in Cohort 1 patients, indicating improved cardiac health [6][5] - All patients in Cohort 1 experienced notable reductions in left ventricular posterior wall thickness (LVPWT) by 21% to 39% and improvements in NYHA classification, with all now classified as NYHA Class I [6][5][4] Group 4: Future Plans and Regulatory Status - Tenaya plans to continue long-term follow-up of patients and periodically report additional results to inform the late-stage development of TN-201 [6][8] - The FDA has placed the MyPEAK-1 trial on clinical hold, and Tenaya is working to address the agency's concerns [9][12]