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• W1968370711 abstract "Abstract Background: Although tumor hypoxia has been associated with a more aggressive phenotype and lower cure rate, there is no consensus as to the method best suited for routine measurement. Binding of the chemical hypoxia marker, pimonidazole, and expression of the endogenous hypoxia markers HIF‐1α and CAIX were compared for their ability to detect hypoxia in tumor biopsies from 67 patients with advanced carcinoma of the cervix. Methods: Two biopsies were taken one day after administration of pimonidazole and were analyzed for pimonidazole binding using flow cytometry or immunohistochemistry. CAIX and HIF‐1α expression and degree of colocalization were measured in sequential antibody‐stained sections. Patient subsets were examined for tumor oxygen tension using an Eppendorf electrode, S phase DNA content, or change in HIF‐1α expression over the course of treatment. Results: Approximately 6% of the tumor area stained positive for pimonidazole, HIF‐1α, or CAIX. The CAIX positive fraction correlated with the pimonidazole positive fraction ( r = 0.60). Weaker but significant correlations were observed between pimonidazole and HIF‐1α ( r = 0.31) and CAIX and HIF‐1α ( r = 0.41). Taking the extent of marker colocalization into consideration increased the confidence that all markers were identifying hypoxic regions. Over 65% of stained areas showed a high degree of colocalization with the other markers. Oxygen microelectrode measurements and S phase fraction were not correlated with the hypoxic fraction measured using the three hypoxia markers. HIF‐1α levels tended to decrease with time after the start of therapy. Conclusions: Endogenous hypoxia marker binding shows reasonable agreement, in extent and location, with binding of pimonidazole. CAIX staining pattern is a better match to the pimonidazole staining pattern than is HIF‐1α, and high CAIX expression in the absence (or low levels) of HIF‐1α may indicate a different biology. © 2005 International Society for Analytical Cytology" @default.
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• W1968370711 date "2006-02-02" @default.
• W1968370711 modified "2023-10-12" @default.
• W1968370711 title "Comparison between pimonidazole binding, oxygen electrode measurements, and expression of endogenous hypoxia markers in cancer of the uterine cervix" @default.
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• W1968370711 doi "https://doi.org/10.1002/cyto.b.20086" @default.
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