PDK4 and metastatic malignant neoplasm in the lymph nodes: Among the 52 DEGs, 10 genes (BDH1, CPT1B, CKMT1A, MSRB3, MGARP, PMAIP1, TDRKH, CKMT1B, PDK4, and BCL2) were linked with head and neck, lung, or lymph node metastasis (Table 1).