1. Flow cytometry and IG/TCR quantitative PCR for minimal residual disease quantitation in acute lymphoblastic leukemia: a French multicenter prospective study on behalf of the FRALLE, EORTC and GRAALL.
- Author
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Garand, R, Beldjord, K, Cavé, H, Fossat, C, Arnoux, I, Asnafi, V, Bertrand, Y, Boulland, M-L, Brouzes, C, Clappier, E, Delabesse, E, Fest, T, Garnache-Ottou, F, Huguet, F, Jacob, M-C, Kuhlein, E, Marty-Grès, S, Plesa, A, Robillard, N, and Roussel, M
- Subjects
FLOW cytometry ,LYMPHOBLASTIC leukemia treatment ,ALLELES ,BONE marrow ,CANCER patients ,CLONE cells - Abstract
Minimal residual disease (MRD) quantification is widely used for therapeutic stratification in pediatric acute lymphoblastic leukemia (ALL). A robust, reproducible, sensitivity of at least 0.01% has been achieved for IG/TCR clonal rearrangements using allele-specific quantitative PCR (IG/TCR-QPCR) within the EuroMRD consortium. Whether multiparameter flow cytometry (MFC) can reach such inter-center performance in ALL MRD monitoring remains unclear. In a multicenter study, MRD was measured prospectively on 598 follow-up bone marrow samples from 102 high-risk children and 136 adult ALL patients, using IG/TCR-QPCR and 4/5 color MFC. At diagnosis, all 238 patients (100%) had at least one suitable MRD marker with 0.01% sensitivity, including 205/238 samples (86%) by using IG/TCR-QPCR and 223/238 samples (94%) by using MFC. QPCR and MFC were evaluable in 495/598 (83%) samples. Qualitative results (<0.01% or 0.01%) concurred in 96% of samples and overall positivity (including <0.01% and nonquantifiable positivity) was concurrent in 84%. MRD values 0.01% correlated highly (r
2 =0.87) and 69% clustered within half-a-log10 . QPCR and MFC can therefore be comparable if properly standardized, and are highly complementary. MFC strategies will benefit from a concerted approach, as does molecular MRD monitoring, and will contribute significantly to the achievement of 100% MRD informativity in adult and pediatric ALL. [ABSTRACT FROM AUTHOR]- Published
- 2013
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