Article Synopsis

  • Mesenchymal precursor cells (MPCs) were tested for their safety and effectiveness in treating high-risk heart failure with reduced ejection fraction (HFrEF) in a study involving 565 patients.
  • The results showed no significant difference in the primary outcome of recurrent heart-related events between patients receiving MPCs and the control group, although MPCs helped improve heart function in some patients, particularly those with inflammation.
  • MPCs reduced the risk of serious cardiovascular issues like heart attacks and strokes, especially in patients with elevated inflammation markers, but overall the primary endpoints of the study were not met.

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Article Abstract

Background: Mesenchymal precursor cells (MPCs) are allogeneic, immunoselected cells with anti-inflammatory properties that could improve outcomes in heart failure with reduced ejection fraction (HFrEF).

Objectives: This study assessed the efficacy and safety of MPCs in patients with high-risk HFrEF.

Methods: This randomized, double-blind, multicenter study evaluated a single transendocardial administration procedure of MPCs or sham-control in 565 intention-to-treat patients with HFrEF on guideline-directed therapies. The primary endpoint was time-to-recurrent events caused by decompensated HFrEF or successfully resuscitated symptomatic ventricular arrhythmias. Hierarchical secondary endpoints included components of the primary endpoint, time-to-first terminal cardiac events, and all-cause death. Separate and composite major adverse cardiovascular events analyses were performed for myocardial infarction or stroke or cardiovascular death. Baseline and 12-month echocardiography was performed. Baseline plasma high-sensitivity C-reactive protein levels were evaluated for disease severity.

Results: The primary endpoint was similar between treatment groups (HR: 1.17; 95% CI: 0.81-1.69; P = 0.41) as were terminal cardiac events and secondary endpoints. Compared with control subjects, MPCs increased left ventricular ejection fraction from baseline to 12 months, especially in patients with inflammation. MPCs decreased the risk of myocardial infarction or stroke by 58% (HR: 0.42; 95% CI: 0.23-0.76) and the risk of 3-point major adverse cardiovascular events by 28% (HR: 0.72; 95% CI: 0.51-1.03) in the analysis population (n = 537), and by 75% (HR: 0.25; 95% CI: 0.09-0.66) and 38% (HR: 0.62; 95% CI: 0.39-1.00), respectively, in patients with inflammation (baseline high-sensitivity C-reactive protein ≥2 mg/L).

Conclusions: The primary and secondary endpoints of the trial were negative. Positive signals in prespecified, and post hoc exploratory analyses suggest MPCs may improve outcomes, especially in patients with inflammation.

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http://dx.doi.org/10.1016/j.jacc.2022.11.061DOI Listing

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