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Lam, Colin Siu-Chi; Cheung, Alvin Ho-Kwan; Wong, Sunny Kit-Man; Wan, Timothy Ming-Hun; Ng, Lui; Chow, Ariel Ka-Man; Cheng, Nathan Shiu-Man; Pak, Ryan Chung-Hei; Li, Hung-Sing; Man, Johnny Hon-Wai; Yau, Thomas Chung-Cheung; Lo, Oswens Siu-Hung; Poon, Jensen Tung-Chung; Pang, Roberta Wen-Chi; Law, Wai Lun
PloS one, 05/2014, Volume: 9, Issue: 5Journal Article
CD26, dipeptidyl peptidase IV, was discovered firstly as a membrane-associated peptidase on the surface of leukocyte. We previously demonstrated that a subpopulation of CD26+ cells were associated with the development of distant metastasis, enhanced invasiveness and chemoresistance in colorectal cancer (CRC). In order to understand the clinical impact of CD26, the expression was investigated in CRC patient's specimens. This study investigated the prognostic significance of tumour CD26 expression in patients with CRC. Examination of CD26+ cells has significant clinical impact for the prediction of distant metastasis development in colorectal cancer, and could be used as a selection criterion for further therapy. Tumour CD26 expression levels were studied by immunohistochemistry using Formalin-fixed paraffin embedded (FFPE) tissues in 143 patients with CRC. Tumour CD26 expression levels were correlated with clinicopathological features of the CRC patients. The prognostic significance of tumour tissue CD26 expression levels was assessed by univariate and multivariate analyses. CD26 expression levels in CRC patients with distant metastasis were significantly higher than those in non-metastatic. High expression levels of CD26 were significantly associated with advanced tumour staging. Patients with a high CD26 expression level had significantly worse overall survival than those with a lower level (p<0.001). The expression of CD26 was positively associated with clinicopathological correlation such as TNM staging, degree of differentiation and development of metastasis. A high CD26 expression level is a predictor of poor outcome after resection of CRC. CD26 may be a useful prognostic marker in patients with CRC.
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