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Measuring hypoxia in solid tumours--is there a gold standard?
P L Olive1, J P Banáth, C Aquino-Parsons
1British Columbia Cancer Research Centre and British Columbia Cancer Agency, Vancouver, Canada. polive@bccancer.bc.ca
Acta Oncologica (Stockholm, Sweden)
|February 16, 2002
Summary
Tumour hypoxia correlates with poor treatment response. New methods like comet assay and pimonidazole binding show promise but poorly correlate with traditional oxygen microelectrodes for detecting hypoxic tumours.
Area of Science:
- Oncology
- Radiation Oncology
- Biomedical Engineering
Background:
- Tumour hypoxia is linked to increased cancer aggressiveness and reduced treatment efficacy.
- Accurate detection of hypoxic tumours is crucial for effective cancer therapy.
- The Eppendorf oxygen microelectrode is the sole established method for measuring tumour oxygenation pre-treatment.
Purpose of the Study:
- To validate novel methods for detecting tumour hypoxia.
- To compare the Eppendorf oxygen microelectrode with the comet assay and pimonidazole binding.
- To assess the correlation between different hypoxia detection techniques in patients undergoing radiotherapy.
Main Methods:
- Comparison of Eppendorf oxygen microelectrode, comet assay, and pimonidazole binding.
- Analysis of tumour samples from patients undergoing curative or palliative radiotherapy.
- Measurement of median oxygen tensions, hypoxic fractions, and pimonidazole binding in tumour cells.
Main Results:
- Tumours with median oxygen tension < 10 mmHg exhibit high hypoxic fractions (> 0.20) by comet assay.
- Pimonidazole binding in fine-needle aspiration biopsy samples correlates well with comet assay measurements.
- Hypoxic fractions measured by comet assay and pimonidazole binding show poor correlation with Eppendorf microelectrode measurements.
Conclusions:
- The comet assay and pimonidazole binding offer alternative approaches to assess tumour hypoxia.
- Discrepancies exist between electrochemical and biological/biochemical hypoxia detection methods.
- Further investigation is needed to understand factors influencing these measurement differences and identify the most relevant hypoxic cell populations.