To study the role of EZH2 in BRCA1-mutant breast cancer, we made use of previously described murine tumor cell lines derived from KB1P (clones KB1P-G3 and KB1P-B11) or KP (clones KP-3.33 and KP-6.3) mammary tumors [29]. The gene discussed is BRCA1; the disease is neoplasm.