Human primary medulloblastomas were profiled on Affymetrix Genechip Human Exon 1.0ST arrays at The Centre for Applied Genomics in Toronto, Canada (www.tcag.ca). Expression analysis was performed using Affymetrix Expression Console (Version 1.1) as previously described [26 (link)]. Additional, publically available medulloblastoma expression data sets were obtained from NCBI Gene Expression Omnibus and used to validate our findings [9 (link),27 (link)]. Subgrouping of tumors was performed using an 84-gene expression classifier [28 (link)].
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