BRCA1 and breast cancer: Two models with Brca1 deficiency were featured in a large study that used multiple other mouse mammary tumor models [17], and included 7 mammary tumors that arose after irradiation of Brca1+/-, p53+/- mice (designated Brca1+/-, p53+/- IR-Koller) and 10 tumors from Brca1Co/Co, p53+/-, MMTV-Cre strain, equivalent to the tumors used in our study (designated Brca1-Furth).