LTBP4 and familial dilated cardiomyopathy: On the other hand, when grouping by LTBP4 rs10880 x steroid treatment, within the steroid-treated group there was a significant difference between C/C-C/T genotype (median DCM onset 17.9 years, n = 60) and T/T genotype (>50% of patients DCM-free at last follow-up, n = 13, log-rank p = 0.027) (Fig 2E).