Lower serum T levels and higher SHBG levels in DCM group compared with controls (488.3 ± 188.2 vs. 555.8 ± 165.8 pg/mL, 76.9 ± 30.9 vs. 41.0 ± 15.6 nM/L, respectively), while FAI was significantly lower in DCM patients (2.9 ± 3.5 vs. 5.3 ± 2.6, p < 0.001). The gene discussed is SHBG; the disease is familial dilated cardiomyopathy.