PD-1 expression was not detected in the B-cell lymphoma cell line (MS4), PBMC-derived cell line (Fet-J), astrocyte cell line (G355), macrophage cell line (fcwf-4), and fibroblast cell line (CRFK), and all of mammary adenocarcinoma cell lines (FYMp, FKNp, FONp, FONm, and FMCm) (Table 1 and Supplement Figure). This evidence concerns the gene PDCD1 and B-cell non-Hodgkin lymphoma.