We observed upregulated expression of PD‐1 and LAG3 but suppressed expression of IFN‐γ and Ki‐67 in T cells upon co‐culture with NKTCL cells, and these changes were more significant when T cells were co‐cultured with LMP1‐overexpressed NKTCL cells (Figure 5C,D). This evidence concerns the gene MKI67 and extranodal nasal NK/T cell lymphoma.