FABP5 and synovial sarcoma: In a prospective case-control study of 11 patients newly diagnosed with SS with untreated SSDE, the E-FABP tear concentration was 323.5 ± 325.6 pg/mL, a statistically significant difference from the 4076 ± 5746 pg/mL (p = 0.0136) found in the control group of healthy individuals.