PGP and diffuse large B-cell lymphoma: Marked expression of P-gp/ABCB1 was detected in the Refractory (45.6% ± 10.3, p < 0.001 vs. Remission) group, while there was no difference at initial diagnosis in Remission and Relapsed DLBCL cells (30.8% ± 10.3 and 29.2% ± 9.1 cells, respectively, p > 0.05) (Figure 2).