Hypoxia in human colorectal adenocarcinoma: comparison between extrinsic and potential intrinsic hypoxia markers

International Journal of Radiation Oncology, Biology, Physics
Laurence GoethalsKarin Haustermans

Abstract

To detect and quantify hypoxia in colorectal adenocarcinomas by use of pimonidazole and iododeoxyuridine (IdUrd) as extrinsic markers and carbonic anhydrase IX (CA IX), microvessel density (MVD), epidermal growth-factor receptor (EGFR), and vascular endothelial growth factor (VEGF) as intrinsic markers of hypoxia. Twenty patients with an adenocarcinoma of the left colon and rectum treated by primary surgery were injected with pimonidazole and IdUrd. Serial sections of tumor biopsies were single stained for VEGF, EGFR, Ki67, and double stained for blood vessels in combination with either pimonidazole, IdUrd, or CA IX. Percentage of expression was scored as well as colocalization of pimonidazole with CA IX. The median percentage of hypoxia, as judged by pimonidazole staining, was 16.7% (range, 0-52.4%). The expression of pimonidazole correlated inversely with the total MVD and endothelial cord MVD (R = -0.55, p = 0.01; R = -0.47, p = 0.04). Good colocalization was found between pimonidazole and CA IX in only 30% of tumors, with no correlation overall between pimonidazole and CA IX, VEGF, or EGFR or between the different intrinsic markers. Cells around some vessels (0.08-11%) were negative for IdUrd but positive for Ki 67, which i...Continue Reading

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