Abstract
The site of the gastrointestinal (GI) tract where biopsies are most likely to be diagnostic of graft-versus-host disease (GvHD) remains controversial. Recent reports have indicated that biopsies from the rectosigmoid have sufficient sensitivity and specificity for diagnosing GI GvHD and can be obtained via a less invasive flexible sigmoidoscopy procedure. While GvHD histologic grades 1–3 have little correlation with patients’ symptoms and overall clinical grade, histologic grade 4 GvHD does correlate with severe clinical presentation and a poor prognosis. We examined cases of lower GI biopsies obtained via a complete colonoscopy with ileal intubation for the evaluation of GvHD within a 2-year period from patients who underwent stem cell transplantation. In our study cohort, grade 4 GvHD was significantly more likely to be identified in a terminal ileum biopsy than in a biopsy from another site in the lower GI tract. Significantly, 5 of 6 patients with histologic grade 4 GvHD diagnosed on ileal biopsies died from complication of severe GI GvHD. Given the poor prognosis of histologic grade 4 GvHD in the terminal ileum, the detection of this finding may serve to inform clinicians that escalation or modification of treatment may need to be considered. Furthermore, our findings suggest that terminal ileal biopsies may help to increase sensitivity for identifying patients at high risk for poor outcome of GvHD.
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Acknowledgements
We thank Dr. Basil A. Horst for his helpful critical review of the manuscript.
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This study was funded by the Department of Pathology & Laboratory Medicine of the University of British Columbia.
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Raymond Yip and Hui-Min Yang conceived and designed the study and performed histologic assessment and confirmation of diagnoses. Julia Naso reviewed and analyzed the data and generated the boxplots and Kaplan–Meier curves. Raymond Yip and Hui-Min Yang wrote the manuscript. All authors edited and reviewed the manuscript and gave final approval for publication.
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Yip, R.H.L., Naso, J.R. & Yang, HM. Terminal ileum is the most sensitive site for the histologic diagnosis of grade 4 graft-versus-host disease (GvHD) in the lower GI tract and is a harbinger of poor outcome. Virchows Arch 479, 919–925 (2021). https://doi.org/10.1007/s00428-021-03136-z
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DOI: https://doi.org/10.1007/s00428-021-03136-z