The National Heart, Lung, and Blood Institute (NHLBI), part of the National Institutes of Health, is pausing the CONCERT-HF trial, which involves patients with chronic heart failure. Recent calls for the retraction of journal articles in related fields of cell therapy research have raised concerns about the scientific foundations of this trial. While none of the articles in question derive from the CONCERT-HF trial itself, the NHLBI convened CONCERT-HF’s Data and Safety Monitoring Board (DSMB) out of an abundance of caution to ensure the study continues to meet the highest standards for participant safety and scientific integrity. Informed by the DSMB recommendations of October 25, 2018, the NHLBI is pausing the trial. While the DSMB did not have any participant safety concerns, this pause enables the DSMB to complete its review.