期刊
NEUROPATHOLOGY AND APPLIED NEUROBIOLOGY
卷 41, 期 2, 页码 135-144出版社
WILEY-BLACKWELL
DOI: 10.1111/nan.12161
关键词
beta-catenin; immunohistochemistry; medulloblastoma; mutation analysis; sequencing; Wnt signalling
资金
- German Federal Ministry of Education and Research (BMBF) [01ES0806]
- German Childhood Cancer Foundation (Deutsche Kinderkrebsstiftung)
- Oesterreichische Nationalbank (Anniversary Fund) [13648]
AimsWnt activation in medulloblastomas is associated with good outcome. Upfront testing and risk-adapted stratification of patients will be done in future clinical studies. In a cohort of 186 paediatric medulloblastomas our aim was to identify the optimal methods in standard clinical practice to detect this subgroup. MethodsNuclear accumulation of -catenin was analysed by immunohistochemistry (IHC). DNA of FFPE tissue was amplified by PCR for single-strand conformation polymorphism analysis and direct sequencing of CTNNB1 exon 3. Copy number of chromosome 6 was analysed by multiplex ligation-dependent probe amplification and molecular inversion profiling. ResultsDifferent automated immunostaining systems showed similar results. Twenty-one of 186 samples had nuclear accumulation in 5% of cells, 17 samples showed <5% -catenin positive nuclei. None of these 17 cases had CTNNB1 mutations, but 18 of 21 cases with 5% accumulation did, identifying these 18 cases as Wnt-subgroup medulloblastomas. Fifteen of 18 mutated cases showed monosomy 6, 3 had balanced chromosome 6. On the contrary, none of the CTNNB1 wild-type tumours had monosomy 6. ConclusionsStandard neuropathological evaluation of medulloblastoma samples should include IHC of -catenin because tumours with high nuclear accumulation of -catenin most probably belong to the Wnt subgroup of medulloblastomas. Still, IHC alone may be insufficient to detect all Wnt cases. Similarly, chromosome 6 aberrations were not present in all CTNNB1-mutated cases. Therefore, we conclude that sequencing analysis of CTNNB1 exon 3 in combination with -catenin IHC (possibly as pre-screening method) is a feasible and cost-efficient way for the determination of Wnt medulloblastomas.
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