We indeed found that BRCA1-deficient mouse mammary tumors have higher EZH2 protein levels than control tumors, also indicated by the higher percentage of tumor cells with EZH2 expression above background (77% in KB1P tumors versus 11.5% in KP tumors; Wilcoxon P < 0.029; Figure 1c). The gene discussed is BRCA1; the disease is neoplasm.