Heatmaps with average relative methylation and expression levels stratified by subtype. Subtype expression markers according to Hu et al.  having subtype-specific methylation are displayed. The number of samples in each subtype (top) and the Pearson correlation between methylation (red, more methylated; green, less methylated) and expression levels (red, high; green, low) are shown. The expression levels correspond well with methylation status. Gene expression data were unavailable for CXCL9.