Background: In a previous study, we reported a critical role of epidermal growth factor-like domain 7 (EGFL7) in the metastasis of hepatocellular carcinoma (HCC) and documented it to be a prognostic biomarker as well as a potential therapeutic target for HCC. However, the role of EGFL8, the only known paralog of EGFL7, in human malignancies is currently unclear.
Patients And Methods: EGFL8 expression in 101 cases of colorectal cancer (CRC) patients was determined by quantitative reverse transcription-polymerase chain reaction and the clinicopathological features of the CRC patients were correlated with the EGFL8 down-regulation scores. In addition, the survival curve and Cox regression model were also employed to assess the prognostic value of EGFL8 down-regulation.
Results: EGFL8 was significantly decreased in CRC tissues (p<0.0001) and the down-regulation of EGFL8 was evidenced in 74.3% (75/101) of the CRC patients. EGFL8 down-regulation correlated significantly to distant metastasis (p=0.038) and high TNM stage (p=0.012) of CRC. The CRC patients with high EGFL8 down-regulation showed either poorer disease-free survival (p=0.0167) or poorer overall survival (p=0.0310) than those with low EGFL8 down-regulation. Multivariable analysis identified EGFL8 down-regulation as an independent prognostic factor for CRC patients (hazard ratio, 12.974; p=0.037).
Conclusion: The reduced expression of EGFL8 is closely related to metastastic potential and poor prognosis of CRC, suggesting the down-regulation of EGFL8 as a novel prognostic biomarker for CRC patients.
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