Correlation of EZH2 and BMI1 expression with molecular subtypes. (a) Mean mRNA levels of EZH2 and BMI1 in the different subgroups. The distribution of both EZH2 and BMI1 over the subgroups differ significantly, Kruskall-Wallis test. (b) Distribution of subgroups over categorised EZH2 and BMI1 levels. (c) Immunohistochemistry on EZH2 and BMI1 in normal breast tissue, an ErbB2-type and a luminal A-type tumour. Pictures were taken at 40× magnification (left panels) and a zoomed-in section is shown on the right of each image.