Clinical features of patients with systemic sclerosis positive for anti-SS-A antibody: a cohort study of 156 patients.

Anti-SSA positivity increases the risk of organ involvement, such as ILD, in patients with SSc. Additionally, the anti-SSA-positive SSc without SS population may have more severe skin fibrosis than others. Anti-SSA may be a potential marker of ILD and skin severity in SSc.