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Updated: Mar 13, 2026
Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
Published on: February 14, 2025
Molecular targeting of hypoxia in radiotherapy
Sergio Rey1, Luana Schito1, Marianne Koritzinsky2
1Princess Margaret Cancer Centre and The Campbell Family Institute for Cancer Research, University Health Network, Toronto, Ontario, Canada.
Abstract:
Hypoxia (low O2) is an essential microenvironmental driver of phenotypic diversity in human solid cancers. Hypoxic cancer cells hijack evolutionarily conserved, O2- sensitive pathways eliciting molecular adaptations that impact responses to radiotherapy, tumor recurrence and patient survival. In this review, we summarize the radiobiological, genetic, epigenetic and metabolic mechanisms orchestrating oncogenic responses to hypoxia. In addition, we outline emerging hypoxia- targeting strategies that hold promise for individualized cancer therapy in the context of radiotherapy and drug delivery.
Insights
Hypoxia, or low oxygen, drives cancer cell diversity and impacts treatment outcomes. Understanding these oxygen-sensitive pathways is key to developing new cancer therapies targeting tumors and improving patient survival.
Area of Science:
- Oncology
- Cancer Biology
- Molecular Medicine
Background:
- Hypoxia (low oxygen) is a critical factor influencing cancer cell behavior and treatment resistance.
- Cancer cells adapt to hypoxic conditions by activating specific molecular pathways.
- These adaptations affect radiotherapy response, tumor recurrence, and patient survival rates.
Purpose of the Study:
- To review the mechanisms by which cancer cells respond to hypoxia.
- To explore the role of hypoxia in radiobiology, genetics, epigenetics, and metabolism.
- To outline novel therapeutic strategies targeting hypoxia for personalized cancer treatment.
Main Methods:
- Literature review of radiobiological, genetic, epigenetic, and metabolic mechanisms.
- Analysis of O2-sensitive pathways in cancer.
- Examination of emerging hypoxia-targeting strategies.
Main Results:
- Hypoxia induces significant molecular adaptations in cancer cells.
- These adaptations involve complex radiobiological, genetic, epigenetic, and metabolic changes.
- Targeting hypoxia presents promising avenues for individualized cancer therapy.
Conclusions:
- Hypoxia is a key driver of cancer heterogeneity and therapeutic challenges.
- A comprehensive understanding of hypoxia-driven mechanisms is essential for effective treatment.
- Emerging hypoxia-targeting strategies offer potential for improved radiotherapy and drug delivery in cancer care.
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