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Related Experiment Video

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Endoscopic and Histologic Features of Immune Checkpoint Inhibitor-Related Colitis.

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Immune checkpoint inhibitor (ICPI)-induced diarrhea and colitis often present with ulcerations and persistent inflammation. Higher-grade adverse events correlated with improved survival, highlighting the need for comprehensive characterization of these toxicities.

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Non-invasive Assessment of the Efficacy of New Therapeutics for Intestinal Pathologies Using Serial Endoscopic Imaging of Live Mice
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Area of Science:

  • Gastroenterology
  • Immunology
  • Oncology

Background:

  • Diarrhea and colitis are common adverse events associated with immune checkpoint inhibitors (ICPIs).
  • A detailed understanding of the endoscopic and histologic features of ICPI-induced gastrointestinal toxicities is lacking.
  • This study aims to characterize these features and their clinical associations.

Purpose of the Study:

  • To describe the endoscopic and histologic findings in patients experiencing diarrhea and colitis due to ICPI therapy.
  • To assess the association between these findings and patient demographics, treatment, and clinical outcomes.
  • To evaluate the long-term course, including recurrence and survival.

Main Methods:

  • Retrospective review of 53 patients with ICPI-related diarrhea/colitis (2011-2017).
  • Data collection included demographics, adverse event grade, treatment, and endoscopic/histologic findings.
  • Long-term follow-up assessed recurrence and survival; Kaplan-Meier curves were used for analysis.

Main Results:

  • Most patients had grade 2+ diarrhea (87%) and colitis (60%).
  • Endoscopic findings included ulcerations (40%) and nonulcerative inflammation (42%). Ulcerations were linked to steroid-refractory disease and high-grade diarrhea.
  • Histology predominantly showed chronic inflammation (60%). Recurrent diarrhea occurred in 36% of patients, with persistent inflammation noted on follow-up endoscopy and histology.

Conclusions:

  • ICPI-induced diarrhea and colitis exhibit diverse endoscopic and histologic patterns.
  • Ulcerative findings correlate with more severe, steroid-refractory disease.
  • Higher-grade ICPI-induced adverse events are associated with improved survival, despite persistent inflammation in many cases.