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The prevalence and prognostic significance of KRAS mutation subtypes in lung adenocarcinomas from Chinese populations

Authors Zheng D, Wang R, Zhang Y, Pan Y, Cheng X, Cheng C, Zheng S, Li H, Gong R, Li Y, Shen X, Sun Y, Chen H

Received 22 September 2015

Accepted for publication 10 November 2015

Published 22 February 2016 Volume 2016:9 Pages 833—843


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Dr William Cho

Difan Zheng,1,2,* Rui Wang,1,2,* Yang Zhang,1,2 Yunjian Pan,1,2 Xinghua Cheng,3 Chao Cheng,1,2 Shanbo Zheng,1,2 Hang Li,1,2 Ranxia Gong,1,2 Yuan Li,2,4 Xuxia Shen,2,4 Yihua Sun,1,2 Haiquan Chen1–3,5

1Department of Thoracic Surgery, Fudan University Shanghai Cancer Center, 2Department of Oncology, Shanghai Medical College, Fudan University, 3Shanghai Chest Hospital, Shanghai Jiao Tong University, 4Department of Pathology, Fudan University Shanghai Cancer Center, 5Institutes of Biomedical Sciences, Fudan University, Shanghai, People’s Republic of China

*These authors contributed equally to this work

Background: We performed this retrospective study to identify the prevalence of KRAS mutation in Chinese populations and make a comprehensive investigation of the clinicopathological features of KRAS mutation in these patients.
Patients and methods: Patients from 2007 to 2013 diagnosed with primary lung adenocarcinoma who received a radical resection were examined for KRAS, EGFR, HER2, BRAF mutations, and ALK, RET, and ROS1 fusions. Clinicopathological features, including sex, age, tumor–lymph node–metastasis stage, tumor differentiation, smoking status, histological subtypes, and survival information were analyzed.
Result: KRAS mutation was detected in 113 of 1,368 patients. Nine different subtypes of KRAS mutation were identified in codon 12, codon 13, and codon 61. KRAS mutation was more frequently found in male patients and former/current smoker patients. Tumors with KRAS mutation had poorer differentiation. Invasive mucinous adenocarcinoma predominant and solid predominant subtypes were more frequent in KRAS mutant patients. No statistical significance was found in relapse-free survival or overall survival between patients with KRAS mutation and patients with other mutations.
Conclusion: In Chinese populations, we identified KRAS mutation in 8.3% (113/1,368) of the patients with lung adenocarcinoma. KRAS mutation defines a molecular subset of lung adenocarcinoma with unique clinicopathological features.

Keywords: KRAS, NSCLC, surgery, prognosis

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