ERBB2 and cancer: The perturbations included activation (e.g., using a retrovirus to overexpress an oncogene) or silencing (e.g., an RNA interference experiment), and targeted many genes that are important in cancer, including breast cancer (e.g., ERBB2, TP53, MYC, AKT, RB1, CCND1, etc., see Additional file 1: Table S1).