Kinetics of Elimination of Methotrexate and Its Major Metabolite 7-OH-methotrexate for Observant Patients
NCT ID: NCT03852888
Last Updated: 2021-12-28
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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COMPLETED
NA
62 participants
INTERVENTIONAL
2018-11-14
2021-11-25
Brief Summary
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The objective is to characterize the kinetics of elimination of methotrexate and its main metabolite7-OH-methotrexate for observant patients according to treatment (dosage, administration) and patient characteristics.
Once this kinetics is characterized, it will be considered as a comparison reference to identify non-observant patients that is to say having concentrations lower than the lower bound of the confidence interval of the observed concentrations.
Detailed Description
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Assessment Criteria: Urinary concentration of methotrexate and its metabolite 7-OH-methotrexate at different days post-administration.
Investigation plan: Determination of urinary methotrexate and its 7-OH-methotrexate metabolite on 8 urine samples (just before taking, then 2 hours after treatment and then on D3, D4, D5, D6, D7, D8 before re-taking methotrexate) in the same patient treated with methotrexate weekly. It will take 10 patients per dosage level, followed by 3 to 8 days post-administration, to distinguish the urinary methotrexate concentrations of observant patients from those of non-observant patients with the power of 90%.
Statistical Analysis Plan: The main objective of this study is to characterize the elimination kinetics of methotrexate and its major metabolite 7-OH-methotrexate in patients observing the various methotrexate regimens. Once this kinetics is characterized, it will be considered as a comparison reference to identify non-observant patients that is to say having concentrations lower than the lower bound of the confidence interval of the observed concentrations.
On the one hand, simulations based on published population pharmacokinetic models of plasma methotrexate are used to estimate the periods of elimination of methotrexate. The simulations that the investigators carried out on the basis of these models highlight that these elimination periods are between 3 and at the latest 9.5 days. These periods correspond to the time required to eliminate 99% of methotrexate.
Finally, it will take 10 patients per dosage level, by administration (oral or subcutaneous), followed by the 3rd to 8th day post-administration, to distinguish urinary methotrexate concentrations from observant patients (1 +/- 0.3 nM) of non-observant patients (0.4 +/- 0.4 nM) with the power of 90%. The dosage schedules are 10, 15, 20 mg methotrexate / week per-os or subcutaneous injection. It will recruit 60 patients. The follow-up will be limited to 8 days maximum because the administration is done once a week.
Conditions
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Study Design
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NA
SINGLE_GROUP
TREATMENT
NONE
Study Groups
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mtugroup
All patients managed for rheumatoid arthritis (according to the ACR / EULAR 2010 criteria) in the Rheumatology Department of the University Hospital of Reims and treated with methotrexate monotherapy.
Urine samples taken to measure methotrexate and its major metabolite 7-OH-methotrexate level
Each patient will have to complete a total of 8 urine samples after treatment with methotrexate. The 8 samples will be taken over one week (just before taking, then 2 hours after taking treatment and then on D3, D4, D5, D6, D7, D8 before the new dose of methotrexate).
Interventions
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Urine samples taken to measure methotrexate and its major metabolite 7-OH-methotrexate level
Each patient will have to complete a total of 8 urine samples after treatment with methotrexate. The 8 samples will be taken over one week (just before taking, then 2 hours after taking treatment and then on D3, D4, D5, D6, D7, D8 before the new dose of methotrexate).
Eligibility Criteria
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Inclusion Criteria
* Patient affiliated to a social security scheme.
Exclusion Criteria
18 Years
ALL
No
Sponsors
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CHU de Reims
OTHER
Responsible Party
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Locations
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Chu Reims
Reims, , France
Countries
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Other Identifiers
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PO18172*
Identifier Type: -
Identifier Source: org_study_id