CD4 and synovial sarcoma: There was a negative correlation between tricellulin gene expression and those of CD3D, CD3E (two important CD3 subunits), and CD4, with Pearson correlation coefficients of −0.58, −0.55, and −0.46 respectively (Supplemental Fig. 2b), suggesting that the quantity of T cells may negatively correlate with tricellulin expression in the salivary glands of patients with SS.