CD4 and synovial sarcoma: To verify whether the high frequency of ZEB1 SCNA led also to an altered transcript level, we analyzed the mRNA expression in 43 samples, with available RNA, from 35 SS patients and 3 cell lines (Table 1); we used CD4+ T cells from four healthy controls to calibrate the fold-change (FC) values of ZEB1 in quantitative PCR assays.