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Objective.-To examine the survival of women with stage I non-endometrioid endometrial cancer with malignant peritoneal cytology.Methods.-A retrospective observational cohort study was conducted to examine the National Cancer Institute's Surveillance, Epidemiology, and End Results Program from 2010 to 2016. Women with stage I serous, clear cell, carcinosarcoma, undifferentiated, and mixed endometrial cancer with known peritoneal cytology results at hysterectomy were examined (N = 4506). Propensity score inverse probability of treatment weighting was used to balance the measured covariates, and survival outcomes were assessed according to peritoneal cytology results.Results.-Malignant peritoneal cytology was reported in 401 (8.9%) women. In multivariable analysis, older age, serous histology, and large tumors were associated with an increased likelihood of malignant peritoneal cytology (all, P < 0.05). In a propensity score weighted model, *

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