Identification of comorbidities that place men at highest risk of death from androgen deprivation therapy before brachytherapy for prostate cancer

Abstract

To determine which specific comorbidities predispose men to excess mortality by androgen deprivation therapy (ADT) given before and during brachytherapy for prostate cancer. We analyzed 5972 men with T1c-T3b prostate cancer treated with brachytherapy-based radiation with or without neoadjuvant ADT. Cox multivariable analysis with propensity scoring was used to determine if ADT was associated with increased all-cause mortality (ACM) in men divided into groups stratified by cardiac comorbidities. Tests for interaction between risk group and outcome were performed. ADT was associated with increased ACM in men with a history of myocardial infarction or congestive heart failure, regardless of whether they underwent revascularization (adjusted hazard ratio [AHR], 2.1 [95% confidence interval {CI}, 1.02-4.17; p=0.04]) or not (AHR, 1.8 [95% CI, 1.05-3.20; p=0.03]), but this effect was not seen in men with less severe comorbidity. However, among men with diabetes, there was a significant interaction with risk group (p=0.01) such that ADT was associated with excess mortality in men with low-risk disease (AHR=2.21 [1.04-4.68]; p=0.04) but not in men with intermediate or high-risk disease (AHR, 0.64 [0.33-1.22]; p=0.17). ADT was associated with excess ACM in all patients with a history of congestive heart failure or myocardial infarction, regardless of whether they were revascularized, and in diabetics with low-risk disease. ADT for gland downsizing before brachytherapy should be avoided in these men.