Ascites are an important complication of ovarian cancer, indicating the metastasis and development of tumors.[23] Next, we constructed a metastatic model in C57BL/6 mice using ID‐8‐R cells of the indicated genotypes.[24] It was found that KAT6A‐KO or KAT6A‐ΔIDR decreased the number of metastatic foci and repressed the formation of ascites under olaparib and cisplatin treatment (Figure 4H; Figure S3A, Supporting Information). Here, KAT6A is linked to ovarian carcinoma.