dMMR patients who had NCT were likely to have higher CEA (abnormal CEA: 51.6% vs. 17.4%, p < 0.001), more multiorgan resection (38.7% vs. 16.8%, p = 0.006), and larger tumor diameter (7.26 vs. 6.21, p = 0.033). This evidence concerns the gene CEACAM5 and neoplasm.