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Marrow purging in autologous bone marrow transplantation for t lineage acute lymphoblastic leukemia efficacy of ex vivo treatment with immunotoxins and 4 hydroperoxycyclophosphamide against fresh leukemic marrow progenitor cells



Marrow purging in autologous bone marrow transplantation for t lineage acute lymphoblastic leukemia efficacy of ex vivo treatment with immunotoxins and 4 hydroperoxycyclophosphamide against fresh leukemic marrow progenitor cells



Blood 69(1): 361-366



A lymphoblast progenitor cell assay was used to evaluate the antileukemic efficacy of marrow-purging protocols that employed intact ricin immunotoxins (IT) and 4-hydroperoxycyclophosphamide (4-HC) against clonogenic primary T-lineage marrow blasts freshly obtained from 12 T-lineage acute lymphoblastic leukemia (ALL) patients. Residual T-lineage blast colonies were observed after treatment with 1 .mu.g/mL T101 (anti-CD5)-Ricin (R) + G3.7 (anti-CD7)-R in eight of 12 cases and after 100 .mu.g/mL 4-HC in six of nine cases. By comparison, a combination of IT and 4-HC proved very effective against T-lineage leukemic progenitor cells, and no residual blast colonies were observed in any of the eight cases studied. We conclude that future trials should consider combined treatment protocols such as IT + 4-HC for more effective purging of autologous marrow grafts.

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Accession: 005854104

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PMID: 3098325


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