CD4 and synovial sarcoma: Regarding the percentage of CD4+CTL4A4+ cells, SS patients had higher percentage when compared to controls (1.25 ± 0.20% vs. 0.70 ± 0.20%, p = 0.01) and to the SR group (1.25 ± 0.20% vs. 0.48 ± 0.10%, p = 0.01).