Minimal residual disease analysis for the prediction of relapse in children with standard-risk acute lymphoblastic leukaemia |
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Authors: | Nicholas J. Goulden,Christopher J. C. Knechtli,Russell J. Garland,Kenneth Langlands,Jeremy P. Hancock,Michael N. Potter,Colin G. Steward,& Anthony Oakhill |
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Affiliation: | Department of Pathology and Microbiology, School of Medical Sciences, University of Bristol,;Department of Paediatric Haematology, Royal Hospital for Sick Children, Bristol |
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Abstract: | We report a largely retrospective analysis of minimal residual disease (MRD) in a cohort of 66 children suffering from acute lymphoblastic leukaemia (ALL). All patients lacked high-risk features at diagnosis, i.e. the presenting white cell count was <50 × 109/l, age 1–16 years and translocations t(9;22) and t(4;11) were not present. All were treated according to either the MRC protocols UKALL X or XI. PCR of IgH, TCRδ and TCRγ gene rearrangements and allele-specific oligoprobing were employed for the detection of MRD. Sensitivity was at least 10−4 in 78/82 (93%) probes examined. A total of 33 patients relapsed (seven on therapy and 26 off) and 33 remain in continuing complete remission (CCR) (median follow-up 69 months from diagnosis). Of those who remain in CCR, MRD was present in the bone marrow in 32%, 10% and 0% at 1, 3 and 5 months into therapy respectively. This is in marked contrast to the presence of MRD at these times in 82%, 60% and 41% of patients who relapsed ( P <0.001, P <0.005 and P <0.005). These results provide further evidence of a strong correlation between clearance of MRD early in therapy and clinical outcome in childhood ALL. |
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Keywords: | minimal residual disease acute lymphoblastic leukaemia immunoglobulin heavy chain gene T-cell receptor gene risk factor |
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