Background: Endometrial cancer and its treatment may impact urinary system function, but few large-scale studies have examined urinary diagnoses among endometrial cancer survivors. We investigated the risk of several urinary outcomes among older women with endometrial cancer compared to similar women without a cancer history. Methods: Women aged 66+ years with an endometrial cancer diagnosis during 2004-2017 (N=44,386) and women without a cancer history (N=221,219) matched 1:5 on exact age, race/ethnicity, and state were identified in the Surveillance, Epidemiology, and End Results-Medicare linked data. ICD-9 and -10 diagnosis codes were used to define urinary outcomes in the Medicare claims. Hazard ratios (HRs) for urinary outcomes were estimated using multivariable Cox proportional hazards regression models. Results: Relative to women without cancer, endometrial cancer survivors were at an increased risk of several urinary system diagnoses, including lower urinary tract infection (HR=2.36; 95% CI: 2.32-2.40), urinary calculus (HR=2.22; 95% CI: 2.13-2.31), renal failure (HR=2.28; 95% CI: 2.23-2.33), and chronic kidney disease (HR=1.85; 95% CI: 1.81-1.90). Similar associations were observed in sensitivity analyses limited to1+ and 5+ years after endometrial cancer diagnosis. Black race, higher comorbidity index, higher stage or grade cancer, non-endometrioid histology, and treatment with chemotherapy and/or radiation were often significant predictors of urinary outcomes among endometrial cancer survivors. Conclusions: Our results suggest that, among older women, the risk of urinary outcomes is elevated after endometrial cancer. Impact: Monitoring for urinary diseases may be a critical part of long-term survivorship care for older women with an endometrial cancer history.

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