Summary:
We investigate the feasibility of CD34-selected peripheral blood stem cell (PBSC) transplantation followed by pre-emptive CD8-depleted donor lymphocyte infusions (DLI) after a minimal conditioning regimen. Six patients with advanced hematological malignancies ineligible for a conventional myeloablative transplant (n=5) or metastatic renal cell carcinoma (n=1), and with an HLA-identical (n=4) or alternative (n=2) donor were included. The nonmyeloablative conditioning regimen consisted in 2 Gy TBI alone (n=4), 2 Gy TBI and fludarabine (RCC patient, n=1) or cyclophosphamide and fludarabine (patient who had previously received 12 Gy TBI, n=1). Post transplant immunosuppression was carried out with cyclosporin (CyA) and mycophenolate mofetil (MMF). Initial engraftment was achieved in all patients. One out of six patients (17%) experienced grade ⩾2 acute GVHD only after abrupt cyclosporin discontinuation and α interferon therapy for life-threatening tumor progression. T-cell chimerism was 23% (19–30) on day 28, 32% (10–35) on day 100, 78% (49–95) on day 180 and 99.5% (99–100) on day 365. Three out of four patients who had measurable disease before the transplant experienced a complete response. We conclude that CD34-selected NMSCT followed by CD8-depleted DLI is feasible and preserves engraftment and apparently also the graft-versus-leukemia (GVL) effect. Further studies are needed to confirm this encouraging preliminary report.
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Acknowledgements
Frédéric Baron is Research Assistant and Yves Beguin Research Director of the National Fund for Scientific Research (FNRS, Belgium). This work was supported by grants from ‘La Fondation Bonjean- Oleffe’, ‘L'Association sportive contre le Cancer’, ‘Le Fonds de Recherche Scientifique du CHU Sart-Tilman’ and the National Fund for Scientific Research (FNRS, Belgium).
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Baron, F., Baudoux, E., Frère, P. et al. Low T-cell chimerism is not followed by graft rejection after nonmyeloablative stem cell transplantation (NMSCT) with CD34-selected PBSC. Bone Marrow Transplant 32, 829–834 (2003). https://doi.org/10.1038/sj.bmt.1704220
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DOI: https://doi.org/10.1038/sj.bmt.1704220
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