Personalizing chemo: enzyme test may guide capecitabine dosing
NCT ID NCT04198727
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at how the activity of an enzyme called DPD influences how well the chemotherapy drug capecitabine works in women with metastatic breast cancer. Researchers will measure DPD activity before treatment and track tumor response over 24 months. The goal is to see if DPD levels can predict who benefits most from the drug, potentially leading to more personalized dosing.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Capecitabine
- What this could lead to
- If successful, this could help doctors tailor capecitabine doses based on a patient's DPD enzyme activity, improving treatment outcomes and reducing side effects.
- What could go wrong
- This is a mid-stage study with 155 participants, so results may not apply to all patients. The link between DPD activity and response is not yet proven, and the study is observational in nature.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 2
Tests whether the treatment actually works, and watches for side effects, in a larger group.
- Participants
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About 155 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Jul 2020
- Expected to finish
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Jul 2030
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Female participants only
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Age over 18, * Performance status 0 to 2, * Patients with metastatic HER2 negative breast cancer, * Patients eligible for capecitabine monotherapy at a dose of 2000 mg / m² / day, 14 days every 21 days, * Determination of Uracil level performed according to national recommendations, * Patients with at least one lesion evaluable according to the RECIST criteria 1.1, or presenting at least 1 hypermetabolic lesion on PET-TDM according to PERCIST 1.0 criteria. In the case of single cutaneous metastasis (s), it is required to make photographs of lesions with a measure of the lesions using a ruler, * Patients receiving social coverage. Exclusion Criteria: * Performance status\> 2, * Contraindication to capecitabine monotherapy at a dose of 2000 mg / m² / day, 14 days every 21 days, * Presence of untreated or uncontrolled symptomatic cerebral or leptomeningeal metastases (unstable corticosteroid requirements) and / or non-clinically stable in the 3 months prior to inclusion, * History of cancer, with the exception of cancers in complete remission for more than 5 years, totally resected cutaneous basal cell carcinoma, in situ carcinoma or in situ cervical epithelioma treated, * Vulnerable people
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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
Locations
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Centre Antoine Lacassagne
Nice, 06189, France
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Centre Azuréen de Cancérologie
Mougins, 06250, France
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Clinique Saint Jean
Cagnes-sur-Mer, 06800, France
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Clinique St Georges
Nice, 06105, France
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Hôpital Princesse Grâce
Monaco, 98000, Monaco
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