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Carcinogenesis Advance Access originally published online on November 4, 2005
Carcinogenesis 2006 27(3):454-464; doi:10.1093/carcin/bgi259
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Carcinogenesis vol.27 no.3 © Oxford University Press 2005; all rights reserved.

Reduced expression of EphB2 that parallels invasion and metastasis in colorectal tumours

Dong Li Guo 1, {dagger}, Ji Zhang 2, 3, {dagger}, Siu Tsan Yuen 1, Wai Yin Tsui 1, Annie S.Y. Chan 1, Coral Ho 2, Jiafu Ji 3, Suet Yi Leung 1, * and Xin Chen 2

1 Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong, 2 Department of Biopharmaceutical Sciences, University of California, San Francisco, USA and 3 Department of Surgery, Beijing Cancer Hospital, Peking University School of Oncology, Beijing, China

* To whom correspondence should be addressed. Department of Pathology, The University of Hong Kong, Queen Mary Hospital, Pokfulam, Hong Kong. Tel: 852 28554401; Fax: 852 28725197; Email: suetyi{at}hkucc.hku.ht

EphB2, a receptor tyrosine kinase regulated by the ß-catenin/Tcf4 complex, is expressed in the proliferative compartment of mouse intestine and regulates bidirectional migration of intestinal precursor cells in the crypt-villus axis through repulsive interaction with Ephrin-B ligands. Recently, it has been shown that reduction of EphB activity accelerates colon tumour progression in the ApcMin/+ mice. In this study, we examined the expression of EphB2 in normal colon, adenomas, primary colorectal cancers (CRCs), lymph node metastases and liver metastases using immunohistochemistry on tissue microarrays. In addition, EphB2 was overexpressed in SW480 colon cancer cells to study its effect in vitro. We found that EphB2 was expressed in 100% of normal colon crypt base cells, 78% of adenomas, 55.4% of primary CRCs, 37.8% of lymph node metastases and 32.9% of liver metastases (all differences were statistically significant at P < 0.001 compared with primary CRCs). Patients with CRCs that lose EphB2 expression had more advanced tumour stage (P = 0.005), poor differentiation (P < 0.001), poor overall survival (P = 0.005) and disease-free survival (P = 0.001), with the latter being independent of tumour stage. In vitro studies showed that overexpression of EphB2 inhibited colon cancer cell growth in colony formation assay and activation of EphB2 receptor inhibited colon cancer cell adhesion and migration. Our data demonstrated a progressive loss of EphB2 expression in each critical step of colon carcinogenesis, including the onset of invasion, dedifferentiation and metastasis which are paralleled by adverse patient outcome. EphB2 may achieve its tumour suppressor function through regulation of cell survival, adhesion and migration.


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