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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Cancer Therapies02:49

Cancer Therapies

Cancer therapies are various modes of treatment, such as surgery, radiation therapy, and chemotherapy that are administered to cancer patients.
However, cancer treatments can pose several challenges, as therapies used to kill cancer cells are generally also toxic to normal cells. Moreover, cancer cells mutate rapidly and can develop resistance to chemical agents or radiation therapy. Besides, all types of cancer cells may not respond to the same therapy. Some cancer cells respond to one...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

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.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Biological Effects of Radiation02:59

Biological Effects of Radiation

All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
Regulation of Angiogenesis and Blood Supply01:24

Regulation of Angiogenesis and Blood Supply

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 hydroxylase and factor...
Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...

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Related Experiment Video

Updated: Jul 11, 2026

Generation and Functional Verification of Hypoxia-Sensitive Chimeric Antigen Receptor-T Cells
09:12

Generation and Functional Verification of Hypoxia-Sensitive Chimeric Antigen Receptor-T Cells

Published on: June 14, 2024

Hypoxic radiosensitization: adored and ignored.

Jens Overgaard1

  • 1Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus C, Denmark. jens@oncology.dk

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
|September 11, 2007
PubMed
Summary
This summary is machine-generated.

Modifying tumor hypoxia significantly improves radiotherapy outcomes, enhancing locoregional control and survival. Despite strong evidence, hypoxic modification strategies are not yet standard clinical practice for cancer treatment.

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Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
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Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance

Published on: February 14, 2025

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Last Updated: Jul 11, 2026

Generation and Functional Verification of Hypoxia-Sensitive Chimeric Antigen Receptor-T Cells
09:12

Generation and Functional Verification of Hypoxia-Sensitive Chimeric Antigen Receptor-T Cells

Published on: June 14, 2024

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance
07:07

Tumor Hypoxia Assessment: In Vivo 3D Oxygen Imaging Through Electron Paramagnetic Resonance

Published on: February 14, 2025

Area of Science:

  • Oncology
  • Radiation Oncology
  • Cancer Biology

Background:

  • Solid tumors frequently contain oxygen-deficient (hypoxic) areas.
  • Tumor hypoxia is a known cause of radioresistance and poorer treatment outcomes.
  • Advances in imaging and physiological techniques have improved the identification of hypoxic cells in human tumors.

Purpose of the Study:

  • To systematically review the impact of modifying tumor hypoxia on radiotherapy outcomes.
  • To assess the efficacy of interventions aimed at overcoming hypoxia-induced radioresistance.

Main Methods:

  • Systematic review and meta-analysis of 86 randomized controlled trials involving 10,108 patients.
  • Analysis focused on patients receiving curative-intent primary radiotherapy with or without hypoxia modification.
  • Outcomes assessed included locoregional control, overall survival, distant metastases, and radiation-related complications.

Main Results:

  • Overall modification of tumor hypoxia significantly improved locoregional control (OR=0.77; 95% CI, 0.71–0.86).
  • A significant overall survival benefit was observed with hypoxia modification (OR=0.87; 95% CI, 0.80–0.95).
  • No significant impact was found on distant metastases or radiation-related complications.

Conclusions:

  • There is a high level of evidence supporting the benefit of modifying tumor hypoxia in radiotherapy.
  • Hypoxia modification significantly enhances radiotherapy efficacy, improving patient outcomes.
  • Despite demonstrated benefits, hypoxia modification has not yet been widely adopted into standard clinical practice.