GDF15 and familial dilated cardiomyopathy: When both GDF‐15 and sST2 were included in a model with LVEF and NYHA functional class, only GDF‐15 remained a significant predictor for all‐cause mortality in patients with non‐ischaemic DCM (adjusted HR = 2.2; 95% CI: 1.05‐5.2; P = .038 vs HR = 1.04; 95% CI: 0.6‐1.9; P = .907; Table 2).