Comparison of major adverse cardiovascular events risk after androgen deprivation therapy initiation by body mass index.

Abstract

44 Background: The association between androgen deprivation therapy (ADT) and increased cardiovascular (CV) risk in prostate cancer (PCa) patients is controversial.1-2 Major adverse cardiovascular events (MACE) occurred in 3-6% of patients in a 48-week ADT trial,2 but meta-analysis from a 2011 study found no association between ADT and increased risk of CV death.1 Body mass index (BMI) is a potential risk factor; Lee et al. found a lower risk of MACE in patients with high BMI than those with a normal weight, and patients with low BMI had a higher risk of all-cause mortality.3 This study evaluates the association between BMI and MACE risk in PCa patients on ADT using real-world data. Methods: Analyses of US electronic medical records (2010 to 2020) of PCa patients (n=36,249) receiving LHRH agonist/antagonist injections were conducted to calculate the risk of MACE since ADT initiation for the following BMI groups: <18.5, 18.5 to <25, 25 to <30, 30 to <35, and >35. BMI groups were based on the standard weight status associated with each BMI range (underweight, normal or healthy weight, overweight, obese, and severely obese, respectively).4 The database contained 178,388 LHRH agonist/antagonist injection entries and 965 documented MACE events. Exclusion criteria included lack of ADT initiation date, lack of BMI data, and MACE within 6 months prior to ADT initiation. MACE was defined as myocardial infarction, stroke, and death from any cause based on a recent study in this field.2 Kaplan-Meier event-free survival curves were constructed to compare the risk of MACE between BMI groups. Statistical significance between survival curves was evaluated by log-rank test. Results: Differences in MACE incidence between BMI groups were not significant. (Table). Conclusions: MACE risk was similar across BMI subgroups after ADT initiation. This is consistent with the literature that higher BMIs do not confer additional CV/MACE risk as might be expected (a lower risk of MACE in patients with high BMI than those with normal weight).3 This 10-year analysis in >35,000 patients is likely reflective of the real world, but further study is recommended to evaluate whether BMI should be considered a predisposing risk factor for CV disease in PCa patients undergoing ADT. As the association between ADT and increased CV risk in PCa patients is controversial, future studies evaluating the role of co-morbidities on MACE risk for PCa patients during ADT may be helpful to identify other CV predictors.[Table: see text]