Invasive oxygen measurements and pimonidazole labeling in human cervix carcinoma

Research output: Contribution to journalArticle

  • External authors:
  • Marianne Nordsmark
  • Juliette Loncaster
  • Shu Chuan Chou
  • Hanne Havsteen
  • Jacob C. Lindegaard
  • Susan E. Davidson
  • Mahesh Varia
  • Robin Hunter
  • Jens Overgaard
  • James A. Raleigh

Abstract

Purpose: This study was designed to compare tumor hypoxia assessed by invasive O2 sensitive electrodes and pimonidazole labeling in primary human cervix carcinomas. Methods and Materials: Twenty-eight patients with primary cervix carcinomas (FIGO Stage Ib-IVa) were investigated. Both invasive pO2 measurements and pimonidazole labeling were obtained in all patients. Before treatment, patients were given pimonidazole as a single injection (0.5 g/m2 i.v.). Ten to 24 h later, oxygenation measurements were done by Eppendorf histography, and after this procedure biopsies were taken for pimonidazole-binding analysis. Tumor oxygen partial pressure (pO2) was evaluated as the median tumor pO2 and the fraction of pO2 values ≤ 10 mmHg (HF10). Biopsies were formalin fixed and paraffin embedded, and hypoxia was detected by immunohistochemistry using monoclonal antibodies directed against reductively activated pimonidazole. Pimonidazole binding was evaluated by a semiquantitative scoring system. Results: Both Eppendorf measurements and pimonidazole binding showed large intra-and intertumor variability. A comparison between pimonidazole binding expressed as the fraction of fields at the highest score and HF10 showed a trend for the most well-oxygenated tumors having a low fraction of fields; however, the correlation did not reach statistical significance (p = 0.43, r = 0.165; Spearman's rank correlation test). Conclusion: Hypoxia measured in human uterine cervix carcinomas is heterogeneously expressed both within and between tumors when assessed by either invasive pO2 measurements or pimonidazole binding. Despite a trend that tumors with high pO2 values expressed less pimonidazole binding, no correlation was seen between the two assays in this preliminary report. Copyright © 2001 Elsevier Science Inc.

Bibliographical metadata

Original languageEnglish
Pages (from-to)581-586
Number of pages5
JournalInternational Journal of Radiation Oncology Biology Physics
Volume49
Issue number2
DOIs
Publication statusPublished - 1 Feb 2001