GSTO2 and colonic neoplasm: The Wilcoxon or Kruskal–Wallis test indicated that the overexpression of GSTO2 in colon cancer has a significant correlation with N classification (N2 vs. N1), M classification (M1 vs. N0), and stage (Stage I vs. Stage IV, Stage I vs. Stage III, and Stage II vs. Stage IV) (all p < 0.05; Figures 6(a)–6(c)).