PDCD1 and neoplasm: To delineate the potential role of tumor‐infiltrating B (TIL‐B) cells more clearly in the anti‐PD‐1 treatment for PLC, we accomplished an orthotopic tumor transplantation mice model in the liver using Hepa1‐6 cells and treated the mice with anti‐CD20 antibody, anti‐PD‐1 antibody, and a combination of the two, respectively (Figure S8A, Supporting Information).