UCN2 and systemic sclerosis: Regarding the 19 non-IIM patients in the present study, 4 were clinically diagnosed with anti-ARS antibody-positive myositis, 3 with anti-SRP antibody-positive myositis, 3 with anti-mitochondrial antibody-positive myositis, 1 with systemic lupus erythematosus, 3 with systemic sclerosis, 1 with probable PM, and 4 with possible PM/DM by the Bohan and Peter criteria.