Early Erythrocyte Methotrexate Polyglutamate-4 Predicts Treatment Response and Is Influenced by GGH 401C>T Genotype in Patients with Rheumatoid Arthritis. - Takahashi, Miho; Takahashi, Soshi; Mori, Ayano; Hatachi, Saori; Saito, Toshiharu; Shinohara, Masakazu; Kumagai, Shunichi (Archives of Rheumatology, 2026)