The correlation analysis between CCR8 expression and clinical characteristics showed that no significant association was observed between CCR8 expression on CD4+ PBLs and patients' age, tumor size, tumor type, FIGO stage, tumor differentiation grade, lymph node metastasis, distant metastasis, serum CA125 level, serum HE4 level and the presence of ascites (P > 0.05) (Additional file 5: Table S2). This evidence concerns the gene CCR8 and metastatic malignant neoplasm in the lymph nodes.