To analyse the clinical relevance of 171 genes differentially expressed in cell lines with a retroviral integration in NCOR2, compared with cell lines with an integration in BCAR1 and BCAR3 (Supplementary Table S2), we performed hierarchical clustering of the expression data from our series of 221 ER-positive breast tumours of LNN patients who did not receive adjuvant systemic therapy (Wang et al, 2005). This evidence concerns the gene BCAR1 and breast neoplasm.