IL2 and head and neck squamous cell carcinoma: Next, we evaluated the cytotoxicity of IL‐2‐stimulated NK cells against HNSCC, CAL27 and SCC‐25 cells, and found that the cytotoxicity of IL‐2‐stimulated NK cells against HNSCC cells was significantly enhanced by oe‐CXCL14, but was reduced by sh‐CXCL14 (Figure 2F,G).