Timing matters: menstrual cycle may influence breast cancer treatment choices
NCT ID NCT05878314
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at how the menstrual cycle and preoperative hormone therapy affect a marker called Ki67 in women with early hormone-positive breast cancer. Researchers will also see if adding a genetic test (PAM50) changes treatment recommendations. About 504 women will participate, and the goal is to better personalize adjuvant therapy decisions.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
What this could lead to
If successful, this could help doctors personalize adjuvant treatment decisions for hormone-positive breast cancer patients.
What could go wrong
This is an observational study, not a treatment trial. It may not directly change patient outcomes or lead to new therapies.
Disclaimer
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the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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Department of Women's Health
RECRUITINGTübingen, 72076, Germany
Contact Phone: •••-•••-•••• Email: •••••@•••••