The investigators will evaluate the extent to which implementation of a chronic weight loss medication, Contrave® (Naltrexone/Bupropion), is associated with achieving ≥5% weight loss. All patients will receive the POWER-remote behavioral weight loss intervention (BWL) and have a behavioral coach for the duration of the 6 month study. During months 1-3, the behavioral coach will call weekly. From months 4-6, the behavioral coach will call monthly. At week 9, those who lose ≥5%, designated fast responders, will continue with BWL alone (FAST-BWL) while those who lose <5%, designated slow responders, will continue BWL and initiate Contrave (SLOW-BWL). The SLOW-BWL arm will receive at least 16 weeks of Contrave (as per Federal Drug Administration [FDA] recommended administration) starting at week 9 and discontinue if ≥5% weight loss is not achieved at month 6. During month 3, all participants continue to have weekly calls with the behavioral coach and will be asked about symptoms, which may be related to initiation of pharmacotherapy; any symptoms are reported to the PI for further evaluation. In addition to total weight loss, the investigators will evaluate biomarkers associated with obesity, microbiome and cardiometabolic factors.
This is a single arm phase II study designed to determine the effects of pharmacotherapy and a remote behavioral weight loss intervention on weight loss in breast cancer survivors who are overweight or obese, and the impact of successful weight loss on serum biomarkers and gut microbiome.