Secondly, the cell-of-origin for the luminal-like tumours that arise in MMTV-PyMT and MMTV-Neu mice and the basal-like tumours that arise in Etv6-NTRK3 mice were all found to be luminal progenitor cells (Tao et al., 2015). The gene discussed is ERBB2; the disease is neoplasm.