Conversely to what was observed in solid tumors, we also noted that high CD39 expression correlated with a better prognosis, a finding that, in our cohort of 47 SS patients, appeared to be justified by the increased apoptotic susceptibility and reduced production of IL-2 found in the CD39high SS cells when compared with the CD39low SS cells [97]. The gene discussed is ENTPD1; the disease is synovial sarcoma.