CEACAM5 and neoplasm: Similarly, some studies have validated the clinical T stage, baseline serum carcinoembryonic antigen (CEA) level, kirsten rat sarcoma viral oncogene (KRAS) mutation status, tumor height, and magnetic resonance imaging‐based extramural venous invasion (MRI‐EMVI) status would be applied as predictors of a pathological good response.8, 12, 13, 18