A study in humans demonstrated that plasma exosomal hsa-miR-3186-5p, a low-abundance miRNA, was uniquely elevated in acute myocardial infarction (AMI) patients compared to healthy and coronary artery disease (CAD) groups, where it could not be detected, and was part of an 18-miRNA panel with a diagnostic AUC of 0.87 for AMI [Guo et al. DOI:10.21037/atm-20-2337].