KAT6 is a histone lysine acetyl transferase involved in the epigenetic regulation of oncogenes and it is often dysregulated in cancer, including breast cancer. Inhibiting KAT6 blocks the transcription of genes such as ESR1 and CCND1 and the use of KAT6 inhibitors together with endocrine therapy and CDK4/6 inhibitor therapy may enhance the effectiveness in cancer.