Islet Allotransplantation in the Bone Marrow of Patients With Type 1 Diabetes: A Pilot Randomized Trial

P Maffi, R Nano, P Monti, R Melzi, V Sordi, A Mercalli, S Pellegrini, M Ponzoni, J Peccatori, C Messina, A Nocco, M Cardillo, M Scavini, P Magistretti, C Doglioni, F Ciceri, SJ Bloem, BO Roep, A Secchi, L Piemonti

Research output: Contribution to journalArticlepeer-review


BACKGROUND: Results in murine and nonhuman primate suggested that the bone marrow (BM) might be an alternative site for pancreatic islet transplantation. METHODS: We report the results of 2 clinical studies in patients with type 1 diabetes receiving an intra-BM allogeneic islet transplantation: a feasibility study in patients with hepatic contraindications for liver islet allotransplantation receiving a single intra-BM islet infusion (n=4) and a pilot randomized trial (1:1 allocation using blocks of size 6) in which patients were randomized to receive islets into either the liver (n=6) or BM (n=3) to evaluate islet transplant function and survival RESULTS: We observed no adverse events related to the intrabone injection procedure or the presence of islets in the BM. None of the recipient of an intra-BM allogeneic islet transplantation had a primary nonfunction, as shown by measurable post transplantation C-peptide levels and histopathological evidence of insulin-producing cells or molecular markers of endocrine tissue in BM biopsy samples collected during follow-up. All patients receiving islets in the BM except one lost islet function during the first 4 months after infusion (2 with an early graft loss). Based on biopsies and immuno-monitoring, we concluded that the islet loss was primarily caused by the recurrence of autoimmunity. CONCLUSION: BM is not a suitable alternative site for pancreatic islet allotransplantation in patients with type 1 diabetes.
Original languageEnglish
Pages (from-to)839-885
Number of pages47
Issue number4
Publication statusPublished - 2019


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