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iRECIST: A Case Based Users Guide for Radiologists.

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This summary is machine-generated.

Immunotherapy response assessment requires new criteria beyond RECIST 1.1 due to pseudo-progression. The iRECIST framework offers standardized modifications for immune-related response criteria (irRC) in cancer treatment.

Keywords:
iRECISTimmunotherapyoncologyreporting

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Area of Science:

  • Oncology
  • Radiology
  • Immunology

Background:

  • Immunotherapy with checkpoint inhibitors (ICI) has transformed cancer treatment.
  • Traditional RECIST 1.1 criteria are insufficient for assessing ICI response due to phenomena like pseudo-progression.
  • Accurate radiological assessment is crucial for effective cancer immunotherapy.

Purpose of the Study:

  • To review the evolution of response assessment criteria for cancer immunotherapy.
  • To highlight the limitations of RECIST 1.1 and the development of immune-related response criteria (irRC) and iRECIST.
  • To provide guidance on the application of iRECIST in clinical practice.

Main Methods:

  • Literature review of response assessment criteria in cancer immunotherapy.
  • Comparison of RECIST 1.1, irRC, irRECIST, and iRECIST.
  • Analysis of iRECIST's integration of RECIST 1.1 with immunotherapy-specific modifications.
  • Development of flowcharts and graphical representations for iRECIST interpretation.

Main Results:

  • Traditional RECIST 1.1 criteria can misclassify treatment response in patients receiving ICI.
  • Immune-related response criteria (irRC) and subsequent adaptations (irRECIST, iRECIST) were developed to address immunotherapy-specific response patterns.
  • iRECIST provides a standardized framework but presents implementation challenges.

Conclusions:

  • iRECIST is a crucial tool for accurately assessing radiological response to cancer immunotherapy.
  • Understanding the nuances of iRECIST is essential for oncologists and radiologists.
  • Further efforts are needed to ensure consistent and widespread adoption of iRECIST.