CD79A and diffuse large B-cell lymphoma: In our case, there was indeed an EBV-positive DLBCL first occurring at the age of 53 years, with both IgG and IgA hypogammaglobulinemia at the initial diagnosis of DLBCL, as well as marked hypogammaglobulinemia that persisted and progressed for at least 4 years after DLBCL treatment until the onset of T-cell lymphoma with prominent granulomatous lesions.