EGFR and malignant colon neoplasm: Subgroup analyses based on EGFR expression and tumor location showed significant differences in terms of DFS in the patients with right- and left-sided colon cancers (Figure 2C and 2E) and in terms of OS the in patients with left-sided colon cancers (Figure 2F), but not in those with right-sided colon cancers (Figure 2D).