TNFSF13B and myeloid sarcoma: BAFF serum levels were lower in EBV and MAP positive MS patients in comparison to patients negative to MAP and EBV (Fig. 2A–F) at a statistic borderline level of significance, whereas BAFF levels were statistically significant higher in BOLF negative patients than in IgG BOLF1305–320 positive patients (p = 0.02, Fig. 2D).