CD4 and synovial sarcoma: This study confirms the previous data showing that both SS patients with a high expression of CD39 or CD73 in circulating CD4+ T cells also expressed elevated levels of CD39 or CD73 in the infiltrating lymphocytes of skin biopsies, with a predominant cytoplasmic and membranous distribution of CD39, and a diffuse membranous expression with a focal dot-like distribution of CD73.