GSTM1 and synovial sarcoma: After adjustment for WBC count, Hb level, and platelet and lymphocyte counts, every decrease of 1 ng/mL in plasma Gas6 concentration was related to a 5% and 8% increase in the risk of development of SS (SS vs. normal controls, 0.95 [0.90–0.99]) and pSS (pSS vs. normal controls, 0.92 [0.86–0.99]), respectively.