Browsing by Author "Couturier, Jerome"
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- Age Dependency of the Prognostic Impact of Tumor Genomics in Localized Resectable MYCN-Nonamplified Neuroblastomas. Report From the SIOPEN Biology Group on the LNESG Trials and a COG Validation GroupPublication . Ambros, Inge M.; Tonini, Gian-Paolo; Pötschger, Ulrike; Gross, Nicole; Mosseri, Véronique; Beiske, Klaus; Berbegall, Ana P.; Bénard, Jean; Bown, Nick; Caron, Huib; Combaret, Valérie; Couturier, Jerome; Defferrari, Raffaella; Delattre, Olivier; Jeison, Marta; Kogner, Per; Lunec, John; Marques, Barbara; Martinsson, Tommy; Mazzocco, Katia; Noguera, Rosa; Schleiermacher, Gudrun; Valent, Alexander; Van Roy, Nadine; Villamon, Eva; Janousek, Dasa; Pribill, Ingrid; Glogova, Evgenia; Attiyeh, Edward F.; Hogarty, Michael D.; Monclair, Tom F.; Holmes, Keith; Valteau-Couanet, Dominique; Castel, Victoria; Tweddle, Deborah A.; Park, Julie R.; Cohn, Sue; Ladenstein, Ruth; Beck-Popovic, Maja; De Bernardi, Bruno; Michon, Jean; Pearson, Andrew D.J.; Ambros, Peter F.Purpose: For localized, resectable neuroblastoma without MYCN amplification, surgery only is recommended even if incomplete. However, it is not known whether the genomic background of these tumors may influence outcome. Patients and methods: Diagnostic samples were obtained from 317 tumors, International Neuroblastoma Staging System stages 1/2A/2B, from 3 cohorts: Localized Neuroblastoma European Study Group I/II and Children's Oncology Group. Genomic data were analyzed using multi- and pangenomic techniques and fluorescence in-situ hybridization in 2 age groups (cutoff age, 18 months) and were quality controlled by the International Society of Pediatric Oncology European Neuroblastoma (SIOPEN) Biology Group. Results: Patients with stage 1 tumors had an excellent outcome (5-year event-free survival [EFS] ± standard deviation [SD], 95% ± 2%; 5-year overall survival [OS], 99% ± 1%). In contrast, patients with stage 2 tumors had a reduced EFS in both age groups (5-year EFS ± SD, 84% ± 3% in patients < 18 months of age and 75% ± 7% in patients ≥ 18 months of age). However, OS was significantly decreased only in the latter group (5-year OS ± SD in < 18months and ≥ 18months, 96% ± 2% and 81% ± 7%, respectively; P = .001). In < 18months, relapses occurred independent of segmental chromosome aberrations (SCAs); only 1p loss decreased EFS (5-year EFS ± SD in patients 1p loss and no 1p loss, 62% ± 13% and 87% ± 3%, respectively; P = .019) but not OS (5-year OS ± SD, 92% ± 8% and 97% ± 2%, respectively). In patients ≥ 18 months, only SCAs led to relapse and death, with 11q loss as the strongest marker (11q loss and no 11q loss: 5-year EFS ± SD, 48% ± 16% and 85% ± 7%, P = .033; 5-year OS ± SD, 46% ± 22% and 92% ± 6%, P = .038). Conclusion: Genomic aberrations of resectable non-MYCN-amplified stage 2 neuroblastomas have a distinct age-dependent prognostic impact. Chromosome 1p loss is a risk factor for relapse but not for diminished OS in patients < 18 months, SCAs (especially 11q loss) are risk factors for reduced EFS and OS in those > 18months. In older patients with SCA, a randomized trial of postoperative chemotherapy compared with observation alone may be indicated.
- A multilocus technique for risk evaluation of patients with neuroblastomaPublication . Ambros, Inge M.; Brunner, Bettina; Aigner, Gerhard; Bedwell, Clare; Beiske, Klaus; Bénard, Jean; Bown, Nick; Combaret, Valerie; Couturier, Jerome; Defferrari, Raffaella; Gross, Nicole; Jeison, Marta; Lunec, John; Marques, Barbara; Martinsson, Tommy; Mazzocco, Katia; Noguera, Rosa; Schleiermacher, Gudrun; Speleman, Frank; Stallings, Ray; Tonini, Gian Paolo; Tweddle, Deborah A.; Valent, Alexander; Vicha, Ales; Van Roy, Nadine; Villamon, Eva; Ziegler, Andrea; Preuner, Sandra; Drobics, Mario; Ladenstein, Ruth; Amann, Gabriele; Schuit, Robert J.L.; Pötschger, Ulrike; Ambros, Peter F.Purpose: Precise and comprehensive analysis of neuroblastoma genetics is essential for accurate risk evaluation and only pangenomic/multilocus approaches fulfill the present-day requirements. We present the establishment and validation of the PCR-based multiplex ligation-dependent probe amplification (MLPA) technique for neuroblastoma. Experimental Design: A neuroblastoma-specific MLPA kit was designed by the SIOP Europe Neuroblastoma Biology Committee in cooperation with MRC-Holland. The contained target sequences cover 19 chromosomal arms and reference loci. Validation was performed by single locus and pangenomic techniques (n ¼ 174). Dilution experiments for determination of minimal tumor cell percentage were performed and testing of reproducibility was checked by interlaboratory testing (n ¼ 15). Further 156 neuroblastomas were used for establishing the amplification cutoff level. Results: The MLPA technique was tested in 310 neuroblastomas and 8 neuroblastoma cell lines (including validation and amplification cutoff level testing). Intertechnique validation showed a high concordance rate (99.5%). Interlaboratory MLPA testing (k ¼ 0.95, P < 0.01) revealed 7 discrepant of 1,490 results (0.5%). Validation by pangenomic techniques showed a single discordance of 190 consensus results (0.5%). The test results led to formulation of interpretation standards and to a kit revision. The minimal tumor cell percentage was fixed at 60%. Conclusions: The recently designed neuroblastoma-specific MLPA kit covers all chromosomal regions demanded by the International Neuroblastoma Risk Group for therapy stratification and includes all hitherto described genetic loci of prognostic interest for future studies and can be modified or extended at any time. Moreover, the technique is cost effective, reliable, and robust with a high interlaboratory and intertechnique concordance.