TFRC and cardiomyopathy: In the analysis of iron metabolites and cardiomyopathy, there were 2 single nucleotide polymorphisms (SNPs) in SI (mean F-statistic = 12.3), 69 SNPs in SF (mean F-statistic = 28.7), 3 SNPs in STF (mean F-statistic = 15.2), 2 SNPs in TFRC (mean F-statistic = 11.8), and 24 SNPs in TSP (mean F-statistic = 22.4); and SF was a risk factor for cardiomyopathy (OR = 1.750, 95%CI: 1.152~2.657, P = 0.009).