CXCL13 and non-Hodgkin lymphoma: Defining associations between these B-cell populations and matched serum levels of CXCL13 would be important as we and others have shown that the levels of CXCL13 are significantly elevated in PLWH prior to an AIDS-NHL diagnosis (36, 37, 41, 56–58) and before and after the initiation of treatment of AIDS-NHL patients (59).