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Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
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Radiation-Induced Immune Responses from the Tumor Microenvironment to Systemic Immunity.

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This summary is machine-generated.

Radiotherapy impacts cancer immunity by releasing molecules that shape anti-tumor responses. Understanding these complex immune effects, both local and systemic, is key to improving cancer treatment strategies.

Keywords:
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Area of Science:

  • Oncology
  • Immunology
  • Radiation Oncology

Background:

  • Radiotherapy is a cornerstone of cancer treatment, primarily known for inducing DNA damage and cell death.
  • Beyond direct cytotoxicity, radiotherapy significantly modulates the immune system by releasing immunogenic factors.
  • These radiation-induced immune changes can promote or suppress anti-tumor responses, influencing treatment outcomes.

Purpose of the Study:

  • To review the multifaceted immune responses elicited by radiotherapy.
  • To explore how radiotherapy affects tumor-intrinsic signaling, the tumor microenvironment, and systemic immunity.
  • To highlight the implications of these immune effects on local tumor control and metastatic spread.

Main Methods:

  • Literature review of radiotherapy's immunomodulatory effects.
  • Analysis of tumor-intrinsic, microenvironmental, and systemic immune signaling pathways.
  • Examination of clinical and preclinical evidence on radiation-induced immunity.

Main Results:

  • Radiotherapy triggers the release of immunogenic molecules, inflammatory mediators, and neoantigens.
  • Immune responses to radiotherapy can be dichotomous, leading to either immune activation or suppression.
  • Radiation's immunologic effects extend beyond the irradiated site, influencing systemic immunity and distant tumor sites.

Conclusions:

  • A thorough understanding of radiotherapy-induced immune responses is crucial for optimizing cancer therapy.
  • Strategies are needed to harness beneficial immune effects and mitigate detrimental ones.
  • Further research into systemic and off-target immune modulation by radiotherapy will refine therapeutic approaches.