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Related Concept Videos

Cancer Therapies02:49

Cancer Therapies

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Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
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Adaptive Mechanisms in Cancer Cells02:53

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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Regulation of Angiogenesis and Blood Supply01:24

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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Updated: Nov 1, 2025

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
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Interfering with Tumor Hypoxia for Radiotherapy Optimization.

Irma Telarovic1, Roland H Wenger2, Martin Pruschy3

  • 1Laboratory for Applied Radiobiology, Department of Radiation Oncology, University Hospital Zurich, University of Zurich, Raemistrasse 100, 8091, Zurich, Switzerland.

Journal of Experimental & Clinical Cancer Research : CR
|June 22, 2021
PubMed
Summary
This summary is machine-generated.

Tumor hypoxia predicts poor outcomes and radiation resistance. Targeting hypoxia offers strategies to improve radiotherapy efficacy, especially with hypofractionated regimens, by understanding its molecular pathways.

Keywords:
SBRThypoxiaradiosensitizersradiotherapy

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Area of Science:

  • Radiation oncology
  • Tumor microenvironment biology
  • Cancer therapy

Background:

  • Hypoxia in solid tumors is a key predictor of treatment resistance and poor clinical outcomes.
  • The role of hypoxia in radiotherapy resistance is well-established, driving the search for novel therapeutic agents.
  • Understanding hypoxia's impact is crucial, particularly with the increasing use of hypofractionated radiotherapy.

Purpose of the Study:

  • To review hypoxia-related processes at subcellular, cellular, and tissue levels relevant to radiotherapy.
  • To discuss the significance of tumor hypoxia in radiation oncology, considering hypofractionated treatment shifts.
  • To explore strategies for optimizing radiotherapy by targeting hypoxia and highlight novel molecular pathways.

Main Methods:

  • Literature review of hypoxia-related processes and their impact on radiotherapy.
  • Analysis of hypoxia's significance in radiation oncology, including hypofractionation.
  • Discussion of current and novel strategies for hypoxia interference in cancer treatment.

Main Results:

  • Hypoxia influences radiotherapy resistance across multiple biological levels.
  • Hypoxia poses challenges for conventional and hypofractionated radiotherapy regimens.
  • Novel molecular pathways offer potential targets for radiosensitization.

Conclusions:

  • Targeting tumor hypoxia is critical for overcoming radiotherapy resistance.
  • Strategies to modulate hypoxia can enhance radiation oncology outcomes.
  • Further research into hypoxia's molecular mechanisms may yield new radiosensitizing agents.