CD4 and diffuse large B-cell lymphoma: Similarly, MFI of PD‐1 on the surface of CD4+ T cells in ABC‐ and GCB‐type DLBCL patients were 473 (range: 333.5–635) and 468.5 (range: 341.25–732.75), respectively, which was also significantly higher than the healthy controls (P < 0.001 and P < 0.001, respectively).