Furthermore, we analyzed these CD133+ for chromosomal abnormalities by CGH and molecular analysis for SMARCB1. The result showed that these CD133+ presented with the chromosomal abnormalities identified in a subset of AT/RT of monosomy, mutation, or deletion of chromosome 22, which are typical features of AT/RTs [17], [18]. This evidence concerns the gene SMARCB1 and ataxia telangiectasia.