After glucocorticoid treatment, patients with DCM showed a notable increase in NPR1 mRNA levels in whole blood (Figure 7H), and the enlarged left atrium, right atrium, left ventricle, and right ventricle all exhibited visible reduction (Figures 7C–F), accompanied by a significant recovery in the EF (Figure 7B). This evidence concerns the gene NPR1 and familial dilated cardiomyopathy.