SLC26A9 and synovial sarcoma: Recently, dysfunction of Slc26a9-mediated ion composition was associated with Sjögren’s syndrome (SS) onset (Tandon et al., 2017), according to the alteration of the expression and cellular localization of Slc26a9 in SS saliva when compared with healthy controls (Pedersen et al., 2005; Pijpe et al., 2007).