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In children with acute lymphoblastic leukemia (ALL), the level of minimal residual disease (MRD) at the end of induction strongly predicts outcome, presumably because it measures both drug sensitivity and the number of leukemic cells requiring elimination. Children with high levels (> 10(-3) leukemic cells per marrow cell) nearly always relapse, whereas those with low levels (10(-3) did not relapse. For patients who did relapse, there was an inverse relationship between MRD level and the length of remission. Overall, MRD in adults in whom a translocation had not been identified was significantly higher than in comparably-treated children, suggesting that ALL in adults is more drug-resistant than in children.
Brisco et al. (Sat,) studied this question.
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