Immunological detection of minimal residual disease in children with acute lymphoblastic leukaemia

被引:348
作者
Coustan-Smith, E
Behm, FG
Sanchez, J
Boyett, JM
Hancock, ML
Raimondi, SC
Rubnitz, JE
Rivera, GK
Sandlund, JT
Pui, CH
Campana, D
机构
[1] St Jude Childrens Res Hosp, Dept Hematol Oncol, Memphis, TN 38105 USA
[2] St Jude Childrens Res Hosp, Dept Pathol & Lab Med, Memphis, TN 38105 USA
[3] St Jude Childrens Res Hosp, Dept Biostat & Epidemiol, Memphis, TN 38105 USA
[4] Univ Tennessee, Coll Med, Memphis, TN USA
关键词
D O I
10.1016/S0140-6736(97)10295-1
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Background The clinical significance of submicroscopic levels of leukaemic cells in bone-marrow aspirates from children with acute lymphoblastic leukaemia (ALL) remains controversial. We prospectively determined the frequency and prognostic importance of minimal residual disease detected by a rapid immunological assay in bone-marrow aspirates of children with ALL. Methods 1.58 children with newly diagnosed ALL received 6 weeks of remission-induction chemotherapy. Once complete clinical remission was attained the patients received 2 weeks of consolidation therapy followed by continuation therapy. Bone-marrow aspirates were collected after induction therapy and during weeks 14, 32, and 56 of continuation therapy, and then at 120 weeks (end of therapy). Cells with leukaemia-associated immuno-phenotypes were investigated by multiparameter flow-cytometry capable of detecting one leukaemic cell among 10 000 normal cells. Findings The proportion of patients with detectable leukaemic cells was 23% at remission induction and 17% at week 14 of continuation therapy, decreasing to 5% and 4% at weeks 32 and 56. None of the 65 samples examined at completion of therapy (week 120) showed evidence of Detectable residual disease at the end of induction correlated with adverse genetic abnormalities-the Philadelphia chromosome and MLL gene rearrangements-but not with other presenting features. Detectable leukaemia was associated with subsequent relapse regardless of the time at which bone-marrow samples were examined (p<0.002 for all comparisons). For example, 3-year cumulative incidence (SE) of relapse in patients with and without detectable leukaemia at remission induction was 32.5% (10.6) and 7.5% (4.0), respectively (p<0.001); for tests done at week 14, it was 42.1% (14.6) and 6.6% (3.5), p<0.001. These correlations remained significant after adjusting for adverse presenting features. A higher degree of marrow infiltration by leukaemic cells (greater than or equal to 0.1%) in week 14 samples identified a subset of patients with an especially poor prognosis. Interpretation Immunological detection of residual leukaemic cells at any point in the treatment course is a powerful predictor of relapse in children with ALL. Alternative treatment should be considered for cases with persistent disease beyond the first 3 months of continuation therapy.
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页码:550 / 554
页数:5
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