GLP-1 Drugs Like Ozempic Are Showing a 47 Percent Reduction in Breast Cancer Risk in a Major New Study — and Weight Loss May Not Explain It

A study presented at ASCO 2026 and published June 10, 2026 found that GLP-1 receptor agonists (semaglutide, tirzepatide) are associated with a 30–47% reduction in breast cancer risk among women with diabetes or obesity. The effect may operate through mechanisms beyond weight loss. Here is the full analysis.