Methods. Weused the SEER-Medi care database to identify women ≥65 years of age with stage I ovarian cancer
diagnosed from 1992 to 2009. Patients were categorized as low-risk (non-clear cell histology, stage IA or IB,
grade 1 or 2) or high-risk (clear cell histology, grade 3, or stage IC). We used multivariable logistic regression
models to determine predictors of chemotherapy use and duration and Cox proportional hazards models to evaluate
the effect of chemotherapy use and duration on survival