As shown in Table 2, PGK1 overexpression was positively correlated with the tumor clinical stage (I vs. II–III; P < 0.001), pathological type (adenocarcinoma vs. others; P = 0.007), histological grade (G1 vs. G2 vs. G3; P = 0.002), and lymph node metastasis (negative vs. positive; P < 0.001). Here, PGK1 is linked to adenocarcinoma.