A: Distribution of CDK11 immunohistochemical staining scores in primary, metastatic, and recurrent ovarian cancer. Statistical analysis was performed using a Student’s t-test (between two groups) to compare the CDK11 staining intensity scores among primary tumors, recurrent tumors, and tumors with metastasis, and P < 0.01 was accepted as a significant difference between means. B: Representative images of HE and CDK11 immunohistochemical staining in matched primary, metastatic, and recurrent ovarian cancers.