CD274 and diffuse large B-cell lymphoma: Programmed Death 1 Ligand (PD-L1) interacts with PD-1 on T cells to induce tolerance and limit effector T cell responses [59], and has recently shown to be expressed on human malignant B cells in several types of lymphoma including diffuse large B cell lymphoma (DLBCL), Hodgkin’s lymphoma, and follicular lymphoma [26–28].