IFNG and synovial sarcoma: Compared to healthy controls, the number of peripheral blood NKT cells is significantly reduced in patients with primary Sjögren’s syndrome, but there is a considerable accumulation of NKT cells in the minor salivary glands of SS patients, correlated with the severity of sialadenitis, and high levels of IFN-γ secreted by NKT cells may exacerbate inflammation in the labial glands of SS patients (94, 95).