RUNX1 and mucinous ovarian cancer: Based on the IHC staining results of ovarian tumor tissues microarray, the expression level of RUNX1 was significantly higher in high-grade serous ovarian cancer (HGSOC) tissues compared to low-grade serous ovarian cancer (LGSOC) tissues, mucinous ovarian cancer tissues, while its expression remained normal in non-cancerous ovarian tissues (Fig. 1C–D).