ADIPOQ and synovial sarcoma: PPARγ, which controls the secretion of adipokines, such as adiponectin [52], and its ligands exert not only therapeutic effects to increase tear fluid production [53], but also anti-inflammatory and anti-apoptotic effects in human salivary gland epithelial cells [54] and the amelioration of histopathological lesions in the salivary glands of SS model mice [55].