ABCB1 and B-cell non-Hodgkin lymphoma: As shown in Figure2A, the expression of mdr1, which encodes P-gp, was greater in EBV-positive T cells from all of the examined EBV-T-LPDs patients than in EBV-negative cell line MD901, which was established from a patient with EBV-negative B-cell lymphoma responded to CHOP (Fig.3A) 14.