09/11/2025
🅜🅔🅣🅐 Published Today (November 4, 2025) - A meta-analysis of 25 RCTs (40,731 participants) assessing if antiobesity medications (AOMs) and the weight loss they cause reduce the risk of obesity-associated cancers. TITLE: WEIGHT LOSS, OBESITY MEDICATION, AND RISK OF OBESITY-ASSOCIATED CANCER: A META-ANALYSIS OF RANDOMIZED CONTROLLED TRIALS
🅼 Link: https://doi.org/10.1002/oby.70054
🅼 Key Findings:
This meta-analysis synthesized data from 25 randomized controlled trials (RCTs), including 40,731 participants, to evaluate the link between antiobesity medications (AOMs) and obesity-associated cancer risk.
When analyzing AOMs as a broad class, the study found no significant association with a reduced risk of overall obesity-related cancer compared to placebo (RR = 1.03, 95% CI: 0.78 to 1.37).
Similarly, the amount of weight lost did not correlate with risk reduction when all AOMs were grouped; every 5 kg of weight loss mediated by AOMs was not associated with a lower risk of overall obesity-related cancer (RR = 0.97).
A critical subgroup analysis, however, revealed that coagonists (e.g., tirzepatide, cotadutide, and cagrilintide) significantly reduced the risk of overall obesity-associated cancer (RR = 0.43, 95% CI: 0.19 to 0.97).
In this coagonist subgroup, every 5 kg of weight reduction was also marginally associated with a reduced cancer risk (RR = 0.79, 95% CI: 0.62 to 1.00), suggesting a protective effect specific to this class of medication.
🅼 Clinical Relevance
This analysis suggests that the cancer-protective benefits of weight loss medication may not apply to all AOMs equally. While a general link wasn't found, the positive signal from coagonists (like tirzepatide) is significant. It highlights the need for further research to differentiate between drug classes and to confirm if these specific medications can be used as a strategy for cancer prevention in patients with obesity.
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