Its overall specificity was 63.7%, whereas with regards to tumors forming its closest differential diagnoses, its specificity was 72%. In the study, TLE1 immunostaining was positive in 40 of 42 synovial sarcomas (95.2%), with 30 tumors displaying 3+ staining, ten displaying 2+ staining, and two displaying 1+ staining [7]. This evidence concerns the gene TLE1 and synovial sarcoma.