KAT6A and cancer: As an acetyltransferase, KAT6A promotes the development of several cancers by acetylating histone H3 (H3K23ac).[7, 10, 11] However, we observed no significant differences in the acetylation levels of KAT6A substrates between PARPi‐resistant and PARPi‐sensitive ovarian cancer cells (Figure S1K, Supporting Information).