IL17A and synovial sarcoma: IL-17 and chemokine receptor 9+/α4β7- Th17 cells promoted the inflammation, dysfunction, and cell death in salivary gland of NOD/ShiLtJ mice, in human SS patient, serum IgA and IL-17 level are higher with lower retinoic acid level, and there are a numbers of chemokine receptor 9 and IL-17 double-positive cells in biopsy specimens of salivary gland (88).