Among B-cell non-Hodgkin lymphomas, PD-1 presence was described on 3 of 98 cases of diffuse large B-cell lymphomas (DLBCL), 12 of 13 cases of small lymphocytic lymphoma and 10 of 11 cases of CLL [23], [24]. The gene discussed is PDCD1; the disease is B-cell chronic lymphocytic leukemia.