AIP and synovial sarcoma: The results demonstrated that AIP (r = 0.075, P < 0.001), AI (r = 0.132, P < 0.001), LCI (r = 0.072, P = 0.001), CRI I (r = 0.132, P < 0.001), and CRI II (r = 0.128, P < 0.001) were positively correlated with SS subgroups.