EGFR and metastatic malignant neoplasm in the lymph nodes: The results also indicated that the low expression of AMPK was positively correlated with lymph node metastasis (P = .016, χ2 test, Figure 1D) and tumour T stage (P = .026, χ2 test, Figure 1C), but not with epidermal growth factor receptor (EGFR) mutation rate (P > .05, χ2 test, Figure 1E).