Survival outcomes of obese patients in type II endometrial cancer: Defining the prognostic impact of increasing BMI

• Obesity is highly prevalent in women with type II endometrial cancers
• BMI was not associated with endometrial cancer outcomes in type II endometrial cancers
• The role of obesity as a risk factor for type II EC should be further investigated

ObjectiveTo investigate the role of obesity as a risk factor for type II endometrial cancer (EC), as well as the prognostic significance of increasing body mass index (BMI) on survival.MethodsA single institution retrospective analysis of 154 type II EC cases from 1987 to 2010 was conducted. Patients were categorized into cohorts by BMI (normal (< 25), overweight (25–29.9), obese class I (30–34.9), and obese class IIIII (≥ 35)). Descriptive, regression and ANOVA analyses were performed. Kaplan-Meier curves were compared with log rank tests.ResultsThe BMI distribution was 22.8% normal BMI; 24% overweight; 17.5% class I; and 35.7% class IIIII. The median follow up was 41 months. The median progression-free survival (PFS) was 45.4, 36.0, 35.3 and 42.0 months and overall survival (OS) was 54.7, 44.7, 44.8 and 49.7 months, among the respective groups. There was no association between BMI and PFS (p = 0.71), OS (p = 0.72), or time to recurrence (p = 0.71). There were no differences among the increasing BMI groups compared to normal weight women for the risk of death.ConclusionsOur analysis did not reveal any differences in outcomes by BMI group. Our data reveals that obesity is highly prevalent in type II ECs, though obesity has not historically been described as a risk factor. While BMI as a single variable may not be prognostic for survival outcomes, the role of obesity as a risk factor for type II EC should be further investigated, given the increasing prevalence of obesity in type II ECs.