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Early Pregnancy Reshapes Breast Aging and Lowers Cancer Risk

Early pregnancy prevents buildup of inflammatory IL-33+ hybrid cells linked to breast cancer, potentially explaining why 75% of cases occur after age 50, researchers said.

Summary by News Medical
A new study by cell biologists at the University of California, Santa Cruz, suggests that an early first pregnancy may protect against breast cancer decades later by preventing age-related changes in breast cells that are linked to tumor formation.

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Medical Xpress broke the news in on Monday, February 2, 2026.
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