MUC1 and pulmonary fibrosis: Current smoker (HR 6.105, p = 0.027), serum KL-6 (HR 1.001, p = 0.008), NSIP + OP pattern on HRCT (vs. NSIP pattern; HR 0.089, p = 0.023), high extent of lung fibrosis on HRCT (HR 5.332, p = 0.023), comorbid other CTDs (HR 0.138, p = 0.014), thrombocytopenia (HR 7.676, p = 0.010), and anti-dsDNA antibody titre (HR 0.956, p = 0.027), and neuropsychiatric lesions (HR 6.585, p = 0.020) were found to be significant prognostic factors.