In contrast to miR-1, in all groups miR-21 was positively correlated with NT-proBNP and (for DM r = 0.893, p < 0.001; for CAD + DM r = 0.898, p < 0.001; for HF + DM r = 0.734, p < 0.001) and galectin-3 (for DM r = 0.782, p < 0.001; for CAD + DM r = 0.773, p < 0.001; for HF + DM r = 0.764, p < 0.001). This evidence concerns the gene LGALS3 and diabetes mellitus.