As shown in Table 4, the median serum levels of proinflammatory cytokines (IFN-γ and IL-33) were significantly higher in AIH patients with serum total 25(OH)D levels of < 15 ng/mL than in patients with serum total 25(OH)D levels of ≥ 15 ng/mL (IFN-γ: 0.21 vs. 0 pg/mL, P = 0.0181; IL-33: 26.54 vs. 13.13 pg/mL, P = 0.0036). Here, IFNG is linked to autoimmune hepatitis.