HLA-C and systemic sclerosis: Regarding HLA Class I, none of the associations described in this study: Amerindian origin allele HLA-C*07:02 (protective for dcSSc), Caucasian origin allele HLA-B*08:01 (associated to SSc susceptibility) and Caucasian origin block HLA-C*12:03-B*18:01 (associated to SSc susceptibility) had been described previously.