Colon chaos: when drugs turn against your gut.

PURPOSE OF REVIEW: Immune-mediated diarrhea and colitis (IMDC) is a very common and severe toxicity to immune checkpoint inhibition that has generated a lot of scientific interest. The current guidelines do not capture the most recent literature on this disease entity, and few reviews if any have been published that describe the advances made in our understanding of IMDC. As more and more patients are being treated with immune checkpoint inhibitors (ICIs), it becomes essential to optimize treatment algorithms for ICI-related toxicities, especially IMDC.

RECENT FINDINGS: In our review, we discuss the findings of recent studies on IMDC epidemiology including incidence and risk factors, evaluation and treatment modalities, and surveillance and long-term outcomes. We note that while much has been learned regarding disease epidemiology and the utility of stool biomarkers over clinical symptoms, there remains a paucity of data where IMDC treatment options and long-term IMDC outcomes and surveillance is concerned.

SUMMARY: Our results highlight the most recent advances in our knowledge of IMDC and allow us to propose a management algorithm that improves on prior guidelines for IMDC by incorporating new study findings.