Preoperative serum carcinoembryonic antigen levels are associated with histologic subtype, EGFR mutations, and ALK fusion in patients with completely resected lung adenocarcinoma
Authors Wang Z, Yang S, Lu H
Received 10 February 2017
Accepted for publication 13 June 2017
Published 7 July 2017 Volume 2017:10 Pages 3345—3351
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Akshita Wason
Peer reviewer comments 2
Editor who approved publication: Prof. Dr. Geoffrey Pietersz
Zeng Wang,1 Shifeng Yang,2 Hongyang Lu3,4
1Department of Pharmacy, 2Department of Pathology, 3Zhejiang Key Laboratory of Diagnosis and Treatment Technology on Thoracic Oncology (Lung and Esophagus), Zhejiang Cancer Hospital, Hangzhou, 4Department of Oncology, Wenzhou Medical University, Wenzhou, People’s Republic of China
Background: Serum carcinoembryonic antigen (CEA) is often elevated in lung adenocarcinoma, but not in all patients. Meanwhile, epidermal growth factor receptor (EGFR) mutations and anaplastic lymphoma kinase (ALK) fusion protein are the main driving forces in lung adenocarcinoma. However, whether CEA levels are associated with histologic subtype, EGFR mutations, and ALK fusion remain largely unclear.
Methods: Preoperative serum CEA levels, postoperative histologic subtypes, and statuses of EGFR mutations and ALK fusion protein were retrospectively assessed in 442 patients with completely resected lung adenocarcinoma treated from January 2014 to December 2015 at Zhejiang Cancer Hospital, People’s Republic of China.
Results: EGFR mutations were found in 69.9% (309/442) of lung adenocarcinoma patients, and ALK fusion protein in 4.5% (20/442). EGFR mutations occurred more frequently in the lepidic subtype (P=0.001). High preoperative serum CEA levels (CEA >20 ng/mL) were independently associated with EGFR mutations (P<0.001). Moreover, in patients with CEA levels of 21–49 ng/mL, the EGFR mutation rate was 88.2%, which was higher compared to those obtained in the other subgroups. In addition, all specimens were invasive adenocarcinoma, with lepidic (18.6%), papillary (15.4%), acinar (52.7%), solid (9.7%), micropapillary (3.2%), and mucinous predominant (0.4%) subtypes; CEA levels in patients with the solid subtype were higher than those of other histologic subtypes (P=0.001).
Conclusion: Preoperative serum CEA levels can serve as a reference marker to identify the histologic subtype, and EGFR mutation or ALK fusion protein status, in lung adenocarcinoma patients. Moreover, histological subtypes could also predict EGFR mutations.
Keywords: lung adenocarcinoma, carcinoembryonic antigen, EGFR, ALK, histologic subtype
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