Summary:
Nonmyeloblative stem cell transplantation (NST, SCT) aims to induce host-versus-graft tolerance for subsequent immunotherapy of underlying disease with alloreactive donor lymphocytes, focusing on well-tolerated conditioning suitable for elderly individuals or for other risk factors. However, there is a subset of high-risk patients who cannot tolerate NST. A new protocol consisting of fludarabine 30 mg/m2 × 6 days (days −8 to –2), very-low-dose busulfan (2 mg/kg × 2 days, days −6 to –5), without anti thymocyte globulin (ATG), was employed in 11 high-risk patients aged 26–58 years. Graft-versus-host-disease (GVHD) prophylaxis consisted of low-dose and short-course cyclosporine-A (CSA) alone. One patient died during the nadir due to pulmonary complications. Other patients showed rapid three-lineage engraftment, without complete aplasia; 6/10 patients did not require platelet transfusion and 8/10 had full donor chimerism without transient mixed chimerism. Owing to intentional selection of highly poor-risk patients, overall mortality was high and only one patient survived. Acute GVHD (⩾grade I) occurred in 8/10 evaluable patients, 5/8 while off CSA; 5/8 developed grade III–IV acute GVHD. It appears that our modified, minimally ablative stem cell transplantation (MST) may be used for high-risk patients in need of allo-SCT. Furthermore, although the MST conditioning is not myeloablative, it results in myeloablation of the host hematopoietic system, mediated by alloreactive lymphocytes.
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Shapira, M., Or, R., Resnick, I. et al. A new minimally ablative stem cell transplantation procedure in high-risk patients not eligible for nonmyeloablative allogeneic bone marrow transplantation. Bone Marrow Transplant 32, 557–561 (2003). https://doi.org/10.1038/sj.bmt.1704190
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DOI: https://doi.org/10.1038/sj.bmt.1704190