The gene expression analysis shown for candidate genes in medulloblastoma, other tumours and normal tissues was compiled from multiple gene expression profiling studies [5 (link),39 (link)–47 (link)] (Kool et al. unpublished data). All samples were analysed using the Affymetrix GeneChip Human Genome U133 Plus 2.0 arrays. The MAS5.0 algorithm of the GCOS program (Affymetrix Inc.) was used to normalize the expression data. Data were analysed and statistically verified using the R2 software platform for analysis and graphic visualization of microarray data (see http://r2.amc.nl).
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