EPHB4 and survival of colorectal cancer patients

Veronica Davalos, Higinio Dopeso, Julio Castano, Andrew J Wilson, Felip Vilardell, Jordi Romero-Gimenez, Eloy Espin, Manel Armengol, Gabriel Capella, John M Mariadason, Lauri A Aaltonen, Simo Schwartz, Diego Arango

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    "The family of receptor tyrosine kinases EPH and their Ephrin ligands regulate cell proliferation, migration, and attachment. An important role in colorectal carcinogenesis is emerging for some of its members. In this study, we evaluate the role of EPHB4 in colorectal cancer and its value as a prognostic marker. EPHB4 levels were assessed by immunohistochemical staining of tissue microarrays of 137 colorectal tumors and aberrant hypermethylation of the EPHB4 promoter was investigated using methylation-specific PCR. We found that EPHB4 expression is frequently reduced or lost in colorectal tumors. Patients with low EPHB4 tumor levels had significantly shorter survival than patients in the high EPHB4 group (median survival, 1.8 and > 9 years, respectively; P < 0.01, logrank test), and this finding was validated using an independent set of 125 tumor samples. In addition, we show that EPHB4 promoter hypermethylation is a common mechanism of EPHB4 inactivation. Moreover, reintroduction of EPHB4 resulted in a significant reduction in the clonogenic potential of EPHB4-deficient cells, whereas abrogation of EPHB4 in cells with high levels of this receptor lead to a significant increase in clonogenicity. In summary, we identified EPHB4 as a useful prognostic marker for colorectal cancer. In addition, we provide mechanistic evidence showing that promoter methylation regulates EPHB4 transcription and functional evidence that EPHB4 can regulate the long-term clonogenic potential of colorectal tumor cells, revealing EPHB4 as a potential new tumor suppressor gene in colorectal cancer."
    Original languageEnglish
    JournalCancer Research
    Volume66
    Issue number18
    Pages (from-to)8943-8948
    Number of pages6
    ISSN0008-5472
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Fields of Science

    • 311 Basic medicine

    Cite this

    Davalos, V., Dopeso, H., Castano, J., Wilson, A. J., Vilardell, F., Romero-Gimenez, J., ... Arango, D. (2006). EPHB4 and survival of colorectal cancer patients. Cancer Research, 66(18), 8943-8948. https://doi.org/10.1158/0008-5472.CAN-05-4640