Can lower estrogen pills protect breasts? new study investigates
NCT ID NCT01318005
First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study looked at 82 women aged 18-35 to see if birth control pills with lower estrogen cause less breast cell growth than those with higher estrogen. Participants took one of three different pills for 2-3 months, and researchers measured breast cell activity through a biopsy. The goal is to understand if certain pills might lower breast cancer risk, but this is just an early step—it only measures a marker, not actual cancer.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- Oral contraceptives (birth control pills) with different estrogen doses
- What this could lead to
- If successful, this could help identify birth control pill formulations that lower breast cancer risk while still protecting against other cancers.
- What could go wrong
- This is a small, completed study measuring only a marker of cell growth, not cancer itself. Results may not translate to actual cancer prevention.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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USC University Hospital
Los Angeles, California, 90033, United States