CEACAM5 and non-small cell lung carcinoma: Other studies have indicated that the preoperative carcinoembryonic antigen [29], platelet count [30], and plasma D-dimer level [31] could be used to predict LN metastatic status in patients with operable NSCLC, suggesting that surgeons should carefully review the imaging and laboratory results and make comprehensive preoperative evaluations on the possibility of LN metastasis in NSCLS patients.