Type 1 Diabetes Driven by Residual Recipient T Cells After Hematopoietic Cell Transplantation: A Case Report.
Martin A Thelin, Soohee Cho, Aïsha Callebaut et al.
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Case in brief
A patient developed type 1 diabetes following haploidentical hematopoietic cell transplantation. Analysis revealed an expanded population of islet-specific CD4+ T cells in the recipient, predominantly restricted by recipient-specific HLA alleles, indicating that the diabetes was driven by residual host T cells rather than donor autoimmunity. The condition persisted despite extensive immunotherapy.
Diagnostic / clinical pearl
Clinicians should consider the possibility of residual recipient T cells as a cause of posttransplant type 1 diabetes, particularly in cases with significant donor chimerism.
Why it matters
This case highlights the potential for established islet autoimmunity to persist despite myeloablative conditioning and immunotherapy, emphasizing the complexity of posttransplant diabetes management.