Glucagon-like peptide (GLP)-1 receptor agonists (GLP-1RAs) (including medications that contain GLP-1 and other RAs), hereafter referred to as GLP-1 medicines, have significantly advanced the management of metabolic disease and weight management. Obesity is highly prevalent among cancer survivors at the time of diagnosis, and cancer treatments are associated with subsequent changes in weight, either gain or loss. Research has shown that obesity can adversely affect cancer treatment outcomes and survivorship, leading researchers to investigate the potential integration of GLP-1 medicines into oncology care. There is growing interest in understanding the effects of GLP-1 medicines on weight loss and cancer-related outcomes among individuals with obesity who are taking anticancer therapies, as well as individuals treated for cancer in the past who are long-term survivors. This review examines the literature to characterize what is known about GLP-1 medicine use among cancer survivors. The current literature, though limited and largely retrospective, suggests that GLP-1 medicines may contribute to weight loss among cancer survivors, with outcomes varying by cancer stage and type of anticancer therapy. It is important for healthcare providers to consider the potential negative impact of these GLP-1 medications on their patients, especially those with cancer cachexia or sarcopenic obesity, as well as those undergoing anticancer treatments that often lead to weight loss. While there is preclinical evidence suggesting that there are weight-loss independent effects that may be beneficial to individuals with cancer, use of GLP-1 medicines in patients of normal weight for reasons other than treatment of type 2 diabetes should be initiated with caution. On the positive side, these agents may help mitigate therapy-related toxicities, such as cardiotoxicity, with the potential to enhance survivorship outcomes. Unfortunately, there is a notable lack of well-designed randomized controlled trials evaluating the effects of GLP-1 medicines on weight loss, clinical endpoints, and cancer-related outcomes. Advancing the field requires a focus on elucidating the interactions between GLP-1 medicines and anticancer therapies, particularly their impact on treatment efficacy, nutritional status, and overall patient outcomes, both during treatment and in the long term.
