IFNG and retinitis pigmentosa 1: Serum levels of IFN-γ, IL-1β, and IL-12 were significantly higher in the DM RP-ILD group compared with the other two groups (IFN-γ, p < 0.01 vs DM without RP-ILD, and p < 0.01 vs healthy donors (HD); IL-1β, p = 0.03 vs DM without RP-ILD, and p < 0.01 vs HD; IL-12, p < 0.01 vs DM without RP-ILD and p < 0.01 vs HD).