IL31 and familial dilated cardiomyopathy: In conclusion, IL-31 as scratch factor was a research hot spot before we firstly revealed that rs4758680 (C/A) of IL-31 was associated with the susceptibility of DCM in the Chinese Han people although larger sample sizes of IL-31 SNP would be necessary to confirm our findings; moreover, CC genotype was implicated in the worse prognosis in DCM group.