There was a trend for the absence of methylation at ABCB1, FOXC1, PPP2R2B, and GSTP1 in both the basal-like and normal-like tumours, while IGF2, MLH1 and PTEN were hypomethylated in the basal-like tumours but not in the normal-like tumours. This evidence concerns the gene PTEN and neoplasm.