CEACAM5 and neoplasm: There were no significant differences between the two groups (conversion +/conversion −) in terms of age, gender, BMI, American Society of Anesthesiologists (ASA), presence of cardiopulmonary disease, previous laparotomy, preoperative Hgb and CEA levels, tumor location and size, and pathological tumor-node-metastasis (pTNM) stage and pathology.