Research on the relationship between SS and FABP includes a study by Baldini et al. which found, through the use of proteome analysis of human saliva, that there was a highly significant difference in FABP5 expression in the SS patient group compared with the healthy volunteer group, and they mentioned the possibility that FABP5 can be used as a specific marker that reflects the disease activity of SS and its severity [52]. Here, FABP5 is linked to synovial sarcoma.