Statin-induced IP was defined as: (1) diagnosis with IP (ICD-10 codes: J70.2-J70.4, J84.1, and J84.9) within 3 months after starting statins; (2) steroid administration starts after starting statins; (3) undergoing laboratory tests for sialylated carbohydrate antigen Krebs von den Lungen-6 or pulmonary surfactant protein-D; and (4) undergoing high-resolution computed tomography (HRCT).
A higher P/F ratio and SP-D level, lower LDH and ferritin levels, higher platelet counts, and anti-MDA-5 antibody negativity are important prognostic markers in patients with CADM-associated RPIPs treated with PMX-DHP.