Cluster 2B (‘Epithelial-CDH1-mutated’) includes all breast cancer cell lines harbouring inactivating CDH1 mutations (MDA-MB-134VI, SK-BR-3, SK-BR-5, SUM44PE and OCUB-F) and two cell lines with wild-type CDH1, SUM185PE and Du4475. Here, CDH1 is linked to breast cancer.