CEACAM5 and neoplasm: The presence of metastases other than in the liver or lung, older age (over 70), multiple pulmonary metastases, lung nodules larger than 2 cm, high carcinoembryonic antigen (CEA) levels before pulmonary resection, and mediastinal lymph node involvement have been previously identified as negative prognostic factors after pulmonary metastasectomy for metastatic CRC.8,9) However, the impact of primary tumor location remains understudied, with conflicting results suggesting worse survival for rectal,10) left-sided,11) or right-sided tumors.12)