The prognostic role of serum C-X-C chemokine receptor type 4 in patients with metastatic or recurrent colorectal cancer
Authors Choi YJ, Chang WJ, Shin SW, Park KH, Kim ST, Kim YH
Received 18 January 2016
Accepted for publication 2 April 2016
Published 1 June 2016 Volume 2016:9 Pages 3307—3312
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Triparna Sen
Peer reviewer comments 3
Editor who approved publication: Dr William Cho
Yoon Ji Choi,1 Won Jin Chang,1 Sang Won Shin,1 Kyong Hwa Park,1 Seung Tae Kim,2 Yeul Hong Kim1
1Division of Hematology-Oncology, Department of Internal Medicine, Korea University College of Medicine, 2Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
Background: C-X-C chemokine receptor type 4 (CXCR4) is involved in tumor progression including angiogenesis, metastasis, and survival. However, whether serum CXCR4 levels in metastatic or recurrent colorectal cancer have a prognostic role, have not been evaluated.
Methods: We analyzed serum samples from 55 patients with advanced colorectal cancer diagnosed between March 2008 and July 2011. Serum CXCR4 levels were quantified by a commercially available enzyme-linked immunosorbent assay (ELISA) kit.
Results: The median age of the patients was 62 years, and all patients received systemic chemotherapy of two or more lines. The median serum CXCR4 level was 283.47 pg/mL (range: 77.48–846.52). Patients with two or more metastatic sites, liver metastasis, or higher CA 19-9 level (>37 IU/mL) showed significantly higher levels of serum CXCR4 than patients without. The median overall survival (OS) of all patients was 19.53 months. OS was significantly longer in patients with lower CXCR4 levels (≤240.45 pg/mL) compared with those having higher CXCR4 levels (>240.45 pg/mL) (median OS: 26.50 vs 17.03 months, P=0.046). Univariate analysis showed that liver metastasis, no palliative surgery, and higher levels of CXCR4 (>240.45 pg/mL) had a significantly poor prognostic value with regard to OS (P<0.05).
Conclusion: Serum CXCR4 level was positively correlated with metastatic sites, liver metastasis, or higher CA 19-9 level. Also, there was a significant difference in OS according to the level of CXCR4 expression. These findings suggest that serum CXCR4 levels may be a useful surrogate marker of clinical outcome in metastatic or recurrent colorectal cancer.
Keywords: CXCR4, colorectal cancer, overall survival, prognosis
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