Abstract 14080: A Phase II Randomized, Double-blind, Controlled Trial of Combined Mesenchymal Stromal Cells and C-kit+ Cardiac Progenitor Cells in Ischemic Heart Failure: The CCTRN CONCERT-HF Trial

Introduction: Although preclinical studies of cell delivery in models of ischemic heart failure (HF) suggest a beneficial interaction between mesenchymal stromal cells (MSCs) and c-kit+ cardiac progenitor cells (CPCs) resulting in additive therapeutic effects, no clinical trial has examined a combination of different cell types in ischemic HF. Furthermore, comparative studies of different cell products in humans are rare. CONCERT-HF (NCT02501811) is an NHLBI-sponsored, randomized, double-blind, placebo-controlled, Phase II trial of the Cardiovascular Cell Therapy Research Network (CCTRN) investigating feasibility, safety, and efficacy of MSCs and CPCs, alone and in combination, in patients with chronic ischemic HF. Objectives: To address the following questions: Is combined treatment with MSCs and CPCs feasible and safe in patients with ischemic HF? Do MSCs and CPCs, given alone or in combination, alleviate LV dysfunction, reduce scar size, improve quality of life, and/or augment functional capacity? Is either cell type more effective than the other? Is the combination of MSCs and CPCs more efficacious than MSCs alone or CPCs alone? Methods: Patients were randomized (1:1:1:1) to receive i) the combination of autologous bone marrow-derived MSCs and autologous CPCs, ii) MSCs alone, iii) CPCs alone, or iv) placebo. Target doses were 150 x 10 6 MSCs and 5 x 10 6 CPCs. All patients underwent bone marrow aspiration and right heart catheterization. Endomyocardial biopsy was performed only in the MSC + CPC and CPC alone groups; a “sham biopsy” was performed in the MSC alone and placebo groups. All patients underwent study product injection using the NOGA ® XP Mapping System and were followed for 12 months. Results: A total of 125 patients (116 M, 9 F), 62.5 ± 8.9 years old, were enrolled at 7 CCTRN centers between Nov 2016 and Oct 2018. Baseline LVEF (cardiac MRI) was 28.6 ± 6.1% with a mean scar size of 31.8 ± 10.9 g and NYHA class II (80%) or class III (15.2%). Conclusions: CONCERT-HF is the first cell therapy trial to assess a combination of different cell types and to directly compare two different cell products in patients with HF. All patients will complete follow-up by the end of June and final primary (12-month) safety and outcomes data will be available in August 2020.