Incorporation of pretreatment leukocytosis and thrombocytosis into the FIGO staging system for prognosis in surgically treated endometrial cancer

Objective To investigate the impact of incorporating pretreatment leukocytosis and/or thrombocytosis in the FIGO staging system on prognostic prediction among women with surgically treated endometrial cancer. Methods Retrospective review of clinical data from 900 women with endometrial cancer treated at Osaka University Hospital, Japan, between 2000 and 2016. The effect of concurrent leukocytosis and thrombocytosis on the prediction of recurrence and survival outcomes was evaluated via receiver operating characteristic (ROC) curve analysis and the Kaplan‐Meier method. Results Among 678 women with Stage I–III disease, pretreatment leukocytosis or thrombocytosis alone were not prognostic indicators, but concurrent pretreatment leukocytosis and thrombocytosis was associated with significantly shorter survival (PFS, P <0.001; OS, P =0.004). In contrast, pretreatment leukocytosis, pretreatment thrombocytosis, and concurrent pretreatment leukocytosis and thrombocytosis did not provide any prognostic information for women with Stage IV disease. In ROC curve analysis, incorporation of concurrent pretreatment leukocytosis and thrombocytosis into the FIGO staging system resulted in a higher area under the curve for predicting recurrence for women with Stages I–III disease (0.770 vs 0.755; P =0.045). Conclusion Incorporating concurrent pretreatment leukocytosis and thrombocytosis into the FIGO staging system might improve predictive performance and allow additional risk stratification for women with Stage I–III endometrial cancer.