Fasting plus diabetes drug may shrink breast tumors before surgery

NCT ID NCT05023967

First seen Nov 01, 2025 · Last updated May 15, 2026 · Updated 21 times

Summary

This study looks at whether combining a nightly fast (time-restricted eating) with the diabetes drug metformin can reduce breast cancer cell growth in women with early-stage invasive breast cancer or ductal carcinoma in situ (DCIS). About 120 participants will follow the fasting schedule and take metformin before their planned surgery. The goal is to see if this approach lowers tumor activity and improves markers linked to cancer risk.

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Contacts and locations

Locations

  • European Institute of Oncology

    Milan, 20141, Italy

  • Galliera Hospital

    Genoa, 16128, Italy

  • M D Anderson Cancer Center

    Houston, Texas, 77030, United States

Conditions

Explore the condition pages connected to this study.