CEACAM5 and colorectal carcinoma: Although prethoracotomy serum CEA is considered a prognostic factor in patients undergoing pulmonary resection from CRC,19,21–23,26 routine CEA estimation was not part of the CRC follow-up regime in our patients (since there was no national consensus in this group of patients during the study period) and routine imaging at one and two years picked up most patients with pulmonary metastasis.