DPD activity assessment: Phenotyping DPD with enzyme activity measure and uracil dosage
Capecitabine: Capecitabine assignement at 1000mg per square meter twice daily, cycle of 21 days, 14 days of intake, 7 days of
Study summary
This study evaluates the Impact of DihydroPyrimidine Dehydrogenase (DPD) activity on the efficacy of Capecitabine in patients with metastatic breast cancer. The DPD phenotype before the initiation of treatment will be assess and then the patient will be follow up during the treatment with Capecitabine up to 24 month.
Eligibility
Sex
FEMALE
Min age
18 Years
Max age
—
Healthy volunteers
No
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
Primary outcome measure(s)
6 months objective response rate — 6 months The primary endpoint will be the 6-month objective response to treatment measured using the RECIST 1.1 scale, or PERCIST 1.0. The objective response is defined as the aggregation of the complete + partial response against stabilization + progression.
The distribution of the objective response rate with respect to the value of individual lymphocyte DPD activity before treatment will be examined. This analysis will consist in comparing the objective response rate between patients with a proficient DPD phenotype, measured by lymphocyte DPD activity (\> at the 3rd quartile, ie 25% of the initial population) and non-deficient patients with DPD (including phenotype). between the 13th and 75th percentiles of the initial population).
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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