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Disease Markers
Volume 2017, Article ID 9474532, 6 pages
https://doi.org/10.1155/2017/9474532
Research Article

Associations between the Epithelial-Mesenchymal Transition Phenotypes of Circulating Tumor Cells and the Clinicopathological Features of Patients with Colorectal Cancer

1Department of General Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266011, China
2Department of Gastrointestinal Surgery, The Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong 256603, China
3Department of Ultrasound, The 3rd Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong 510630, China
4Centers for Disease Control and Prevention of Binzhou City, Binzhou, Shandong 256603, China
5Center of Colon and Rectum, Qingdao Municipal Hospital, Qingdao, Shandong 266011, China

Correspondence should be addressed to Baoguang Hu; moc.361@nmlgbh and Dianliang Zhang; moc.621@ldzdhp

Received 16 May 2017; Accepted 2 November 2017; Published 21 December 2017

Academic Editor: Andreas Hillenbrand

Copyright © 2017 Fengjie Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, we identified CTCs using the previously reported CanPatrol CTC enrichment technique from peripheral blood samples of 126 patients with colorectal cancer (CRC) and found that CTCs could be classified into three subpopulations based on expression of epithelial cell adhesion molecule (EpCAM) (E-CTCs), the mesenchymal cell marker vimentin (M-CTCs), or both EpCAM and vimentin (biphenotypic E/M-CTCs). Circulating tumor microemboli (CTMs) were also identified in peripheral blood samples. Meanwhile, E-CTCs, M-CTCs, E/M-CTCs, and CTMs were detected in 76.98%, 42.06%, 56.35%, and 36.51% of the 126 patients, respectively. Interestingly, the presence of CTMs and each CTC subpopulation was significantly associated with blood lymphocyte counts and tumor-node-metastasis stage (). Lymphocyte counts and the neutrophil-to-lymphocyte ratio (NLR) in patients lacking CTCs were significantly different from those in patients testing positive for CTMs and each CTC subpopulation (). Our results indicate that tumor metastasis is more significantly associated with the presence of CTMs and M-CTCs than with other CTC subpopulations and suggest that EMT may be involved in CTC evasion of lymphocyte-mediated clearance.