Measuring Oxygen Levels in Tumors
Author Information
Author(s): Dewhirst M W, Ong E T, Braun R D, Smith B, Klitzman B, Evans S M, Wilson D
Primary Institution: Duke University Medical Center
Hypothesis
The anatomical constraint of arteriolar supply from one side of the tumour results in longitudinal gradients in pO2 sufficient in magnitude to create vascular hypoxia in tumours grown in dorsal flap window chambers.
Conclusion
The study found that the upper surface of the tumour is more hypoxic due to lower pO2 values compared to the fascial surface.
Supporting Evidence
- The vascular pO2 in vessels of the upper surface of these tumours is lower than the pO2 of vessels on the fascial side.
- The study demonstrated that the upper surface of the tumour is more hypoxic because blue light excitation yields lower pO2 values than green light excitation.
- This is the first direct demonstration that longitudinal oxygen gradients actually lead to hypoxia in tumours.
Takeaway
This study looked at how oxygen levels in tumors can be uneven, making some parts of the tumor get less oxygen than others, which can be bad for the tumor.
Methodology
Fischer-344 rats had dorsal flap window chambers implanted, and vascular pO2 was measured using phosphorescence life time imaging.
Participant Demographics
Fischer-344 rats
Statistical Information
P-Value
P < 0.03 for 10th and 25th percentiles and for per cent pixels < 10 mmHg; P < 0.05 for 10th and 25th percentiles and for per cent pixels < 10 mmHg.
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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