Tanaka A, Tsukamoto H, Mitoma H, Kiyohara C, Ueda N, Ayano M, Ohta S, Inoue Y, Arinobu Y, Niiro H, Horiuchi T, Akashi K. Serum progranulin levels are elevated in patients with systemic lupus erythematosus, reflecting disease activity. Arthritis Res Ther. 2012 Nov 11;14(6):R244. PMID: 23140401; PMCID: PMC3674629.