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Oxygen-Guided Radiation Therapy.

Boris Epel1, Matthew C Maggio1, Eugene D Barth1

  • 1National Institutes of Health Center for EPR Imaging In Vivo Physiology, University of Chicago, Chicago, Illinois; Department of Radiation and Cellular Oncology, University of Chicago, Chicago, Illinois.

International Journal of Radiation Oncology, Biology, Physics
|November 12, 2018
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Summary
This summary is machine-generated.

Targeting radiation therapy to localized tumor hypoxia, a known challenge in cancer treatment, significantly improved tumor control in preclinical models. This approach enhances radiation effectiveness by focusing treatment on resistant hypoxic areas.

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Biomedical Imaging

Background:

  • Tumor hypoxia is a widespread characteristic of solid tumors.
  • Hypoxia reduces the effectiveness of radiation therapy, posing a significant challenge in cancer treatment.
  • Previous attempts to improve radiation effectiveness by addressing tumor hypoxia have not been successful.

Purpose of the Study:

  • To investigate if localized treatment of tumor hypoxia can improve radiation therapy effectiveness.
  • To demonstrate the feasibility of targeting radiation delivery to hypoxic subregions within a tumor.
  • To assess the impact of localized hypoxia treatment on tumor control in a preclinical model.

Main Methods:

  • Utilized pulse electron paramagnetic resonance (EPR) pO2 imaging to localize hypoxic regions in mouse fibrosarcoma.
  • Employed 3D-printed radiation blocks for conformal radiation delivery to identified hypoxic areas.
  • Administered radiation boosts specifically to hypoxic volumes and compared outcomes to well-oxygenated volumes.

Main Results:

  • Delivering a radiation boost to hypoxic tumor volumes resulted in a significant doubling of tumor control (P = .04).
  • Targeting well-oxygenated tumor regions with additional radiation provided minimal improvement in tumor control.
  • This suggests that focusing radiation on resistant hypoxic areas is more effective than irradiating sensitive, well-oxygenated regions.

Conclusions:

  • Demonstrated that tumor hypoxia is a localized phenomenon treatable with targeted radiation.
  • This study provides the first evidence, even in preclinical models, of enhancing the therapeutic ratio by targeting additional radiation to hypoxic tumor regions.
  • The findings suggest a potential strategy to reduce dose to sensitive tumor areas without compromising overall tumor control.