IL7 and immunoglobulin G4-related sclerosing disease: It is worth mentioning that the increased production of IL-7, IL-12, IL-23, and other cytokines by IgG4-RD fibroblasts can not only play an immediate role in regulating the immunoinflammatory processes via affecting the functional status of infiltrated immune cells, but also can exert a long-term impact on the progress of autoimmune diseases by participating in the formation of ectopic lymphoid follicles (ELFs) (54).