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• W2138465718 abstract "Clinical and laboratory investigations during the past four decades have resulted in numerous schedules, doses, and routes of delivery for methotrexate (MTX). It remains as an important drug for the treatment of children with acute lymphoblastic leukemia (ALL). Aminopterin (AMT) was the initial antifolate showing promise as an anticancer drug. It is more potent than MTX and also is known to be accumulated more efficiently than MTX in model systems. Because Whitehead et al. (Blood, 76: 44-49, 1990) have shown that MTX accumulation by blasts at diagnosis is of prognostic significance in children with ALL, we reasoned that if accumulation of a stoichiometric inhibitor of dihydrofolate reductase by leukemic blasts was of prognostic importance, then whether it was AMT or MTX may be relevant only with respect to the absolute dose. To compare MTX and AMT metabolism, we incubated lymphoblasts with 1 microM radiolabeled drug in vitro. MTX and AMT accumulation by ALL cells (n = 24) was 0.7 +/- 0.7 and 1.47 +/- 0.9 pmol/10(6) cells, respectively. Based on the data of Whitehead et al., this predicts pharmacological success in 59 and 84% of the MTX and AMT groups, respectively. Moreover, 5 of 10 patients considered poor risks based on MTX accumulation would be cures based on AMT uptake. Even at only 0.1 microM AMT, a concentration at which there is little accumulation of MTX, 5 of 11 patients studied would be pharmacological cures based on AMT uptake. Accumulation of AMT by blasts from 11 patients with T-cell-lineage ALL and 5 patients with acute myelogenous leukemia was also found to be twice the uptake of MTX. These data allow the suggestion that AMT, despite increased potential for toxicity, may be useful in children who are identified as poor risks with respect to MTX uptake." @default.
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• W2138465718 date "1996-01-01" @default.
• W2138465718 modified "2023-09-23" @default.
• W2138465718 title "A case for the use of aminopterin in treatment of patients with leukemia based on metabolic studies of blasts in vitro." @default.
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