B cells were the predominant infiltrating cell type, but other cells, including activated CD4+ T cells and CD8+ T cells with HLA-DR and costimulatory molecules, were found with glandular epithelial cells and stromal infiltrating cells in SS patients, while T cell dominant characteristics were found in the lacrimal glands from patients with GVHD [42,43]. Here, CD4 is linked to synovial sarcoma.