Plain-English translation of NCT06273800 on ClinicalTrials.gov ↗ · Source last updated · Translation generated · How we translate trials
Read our Breast Cancer research guide →This study doesn't follow the usual testing phases — it may be an observational study or a different type of research.
Researchers are studying whether the timing of a woman's menstrual cycle affects how well chemotherapy works against breast cancer. This trial will collect a blood sample from 100 women with triple negative breast cancer on the day they start chemotherapy treatment. The goal is to understand if hormonal changes during the cycle influence how the cancer responds to medicine.
Some research suggests that a woman's menstrual cycle may influence how her body responds to cancer treatment. This study exists to explore that possibility and potentially help doctors optimize when to start treatment for better outcomes.
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Your participation is straightforward: on the day you start your chemotherapy treatment, a blood sample will be collected. Researchers will analyze this sample to look for biological markers that might relate to your menstrual cycle and how your cancer responds to treatment. This is a one-time blood draw — no additional visits or long-term commitments are required.
AI-generated summary from trial data · Jun 30, 2026 · Not medical advice
Netherlands
Sponsor
The Netherlands Cancer Institute
Enrollment target
~100 participants
Started
October 2025
Primary completion
July 2035
Age range
18 Years – 59 Years
Sex
Female only
Last updated on clinicaltrials.gov in November 2025.
Reach out to the team running this trial. Response times vary — some teams are faster than others.
Central contact
Sabine Linn, MD
Antoni van Leeuwenhoek
Tell us you're interested and we'll help connect you with the research team. We'll walk you through what to expect first — no email needed to get started.