[31] For patients with systemic sclerosis, this polymorphism was associated with the presence of pulmonary fibrosis [32]. Therefore, we examined possible associations between STAT4 and the clinical phenotype of type-1 AIH. However, we did not find evidence of association between STAT4 polymorphisms and disease progression or phenotype of type-1 AIH. Here, STAT4 is linked to pulmonary fibrosis.