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442 Background: CXCL5 is known as CXC chemokine which promotes angiogenesis related to cancer. However, the function of serum level of CXCL5 (sCXCL5) has not been fully studied in colorectal cancer. The purpose of this study was to evaluate the relationships between preoperative sCXCL5 and clinicopathological features and prognosis in colorectal cancer. Methods: This was a single-institution, retrospective study. Preoperative serum samples of 250 colorectal cancer patients (between 1998 and 2007, median age: 65.3 years, male 159/female 91) were available for the study, and 33 normal serum was examined and used as a control. sCXCL5 level was assayed using a commercially available enzyme-linked immunosorbent assay kit, and analyzed statistically. Results: Mean level of sCXCL5 was significantly higher in colorectal cancer patients than in control group (p=0.013). Patients with liver metastases had significantly higher sCXCL5 level than those without metastases (p=0.0086), and in logistic analysis, sCXCL5 was an independent marker for predicting liver metastasis (p=0.040). Overall survival of patients with elevated sCXCL5 level was significantly worse than those with lower sCXCL5 (p=0.0006). Conclusions: Preoperative sCXCL5 level was increased in colorectal cancer patients compared to in healthy volunteer and elevated sCXCL5 was correlated with liver metastasis and poor prognosis for overall survival in colorectal cancer patients. Elevated sCXCL5 has been proposed as a useful predictive marker for liver metastasis and overall survival in colorectal cancer. No significant financial relationships to disclose.

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