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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...
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Radiation recall reactions: An oncologic enigma.

Michael J McKay1, Richard Foster2

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Radiation recall reactions (RRR) are inflammatory responses in previously irradiated tissue, triggered by certain medications or vaccines. While often mild and self-limiting, their exact cause remains unknown, with various hypotheses proposed.

Keywords:
ChemotherapyRadiationRadiotherapyReactionsTargeted therapy

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Area of Science:

  • Oncology
  • Dermatology
  • Pharmacology

Background:

  • Radiation recall reactions (RRR) are uncommon adverse events where prior irradiated tissue exhibits inflammation upon exposure to certain drugs.
  • These reactions can be triggered by traditional chemotherapy, targeted therapies, immunotherapies, and even vaccines like the COVID-19 vaccine.

Purpose of the Study:

  • To review the phenomenon of radiation recall reactions, including their clinical presentation, potential mechanisms, and management.
  • To consolidate current understanding and highlight areas needing further research into RRR.

Main Methods:

  • Literature review focusing on reported cases of radiation recall reactions.
  • Analysis of clinical and histopathological features of RRR, particularly cutaneous manifestations.
  • Discussion of proposed pathogenetic mechanisms and treatment strategies.

Main Results:

  • RRR most commonly affect the skin (two-thirds of cases) and present with features of acute or chronic inflammation.
  • Reactions are typically mild and resolve upon drug discontinuation, though severe cases with necrosis have been reported.
  • Rechallenge with the causative agent does not invariably lead to reaction recurrence.

Conclusions:

  • The precise mechanism of RRR is unknown but may involve inflammatory mediators, oxidative stress, vascular changes, or DNA repair abnormalities.
  • Symptomatic treatment with corticosteroids and antihistamines is common, but their efficacy is not definitively established.
  • Further research is needed to elucidate the underlying pathophysiology of RRR and optimize treatment strategies.