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autologous blood and marrow transplantation - Blog Science ...

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Autologous Hematopoietic Stem Cell Transplantation<br />

as Treatment for Adult Acute Lymphoblastic Leukemia<br />

Jorge Sierra, Montserrat Rovira, Luz Muñoz, Carmen Canals,<br />

Pedro Marín, Gregorio Martin-Henao, Alvaro Urbano-lspizua,<br />

Joan Garcia, Anna Sureda, Enríe Carreras,<br />

Salut Brunet, Emilio Montserrat<br />

Hospital de la Santa Creu I Sant Pau <strong>and</strong> Hospital Clinic. Autonomous<br />

<strong>and</strong> Central Universities of Barcelona, Spain<br />

ABSTRACT<br />

Between October 1986 <strong>and</strong> November 1997, 79 adult acute lymphoblastic<br />

leukemia (ALL) patients received an <strong>autologous</strong> stem cell transplant (autoSCT) at<br />

two institutions in Barcelona. In 48 cases, bone <strong>marrow</strong> (BM) was purged with<br />

monoclonal antibodies <strong>and</strong> complement or immunomagnetic beads (P-autoBMT<br />

group). Nineteen patients received an unpurged BMT (Unp-autoBMT) due to<br />

unavailability of the leukemic immunophenotype («=2) or harvesting of an<br />

insufficient number of BM cells (n=17). Autologous peripheral <strong>blood</strong> stem cell<br />

transplant (autoPBSCT) was performed in the remaining 12 cases. Forty-eight<br />

patients were autografted in first complete remission (CR1), 19 in CR2, <strong>and</strong> 12 in<br />

other disease stages. The intensive therapy regimen was cyclophosphamide <strong>and</strong><br />

total-body irradiation in all but one patient. Graft failure was observed in two<br />

patients. Hematologic recovery was significantly faster in the autoPBSCT group.<br />

Six patients died in the first 4 weeks after <strong>transplantation</strong> due to causes other than<br />

leukemia (NLD), three between 4 weeks <strong>and</strong> 6 months, <strong>and</strong> one thereafter. At a<br />

median follow-up of 62 months, 28 patients remain alive <strong>and</strong> disease-free.<br />

Leukemia-free survival (LFS) in patients autografted in CR1 was best in the<br />

autoPBSCT group, intermediate in the P-autoBMT recipients, <strong>and</strong> worst after UnpautoBMT:<br />

75 ± 21, 40 ± 8 <strong>and</strong> 12 ± 11%, respectively. However, this last group<br />

could be unfavorably selected. Relapse was the main cause of treatment failure.<br />

When analyzing P-autoBMT in CR1, factors associated with outcome in patients<br />

treated with chemotherapy also affected transplant results. Adverse features were<br />

high leukocyte counts, delayed CR achievement, <strong>and</strong> poor-prognosis cytogenetic<br />

abnormalities. Our results confirm that long-term LFS may be achieved after<br />

autoSCT in a substantial proportion of adults with ALL. The role of this treatment<br />

vs. chemotherapy <strong>and</strong> the clinical efficacy of purging have to be explored in large<br />

prospective studies.<br />

72

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