RNPC3 and systemic lupus erythematosus: Patients with SLE and associated myositis were more likely to have alopecia (50% vs 17.6%, p=0.02), oral ulcers (80% vs 28.9%, p=0.001), erosive joint disease (60% vs 5%, p<0.001), and anti-RNP antibodies (80% vs 21%, p<0.001) than SLE patients without myositis.