Pharmaco Kinetic Variability of Infliximab in Rheumatoid Arthritis

Study Overview
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Brief Summary
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Infliximab is a chimeric monoclonal antibody directed towards Tumor Necrosis Factor -alpha that is largely used in inflammatory diseases such as rheumatoid arthritis (RA). A relationship between dose and clinical outcomes was shown in populations of RA patients but there is an interindividual variability of this relationship. At an individual level, this dose-effet relationship can be separated into the dose-concentration (pharmacokinetic or PK) and the concentration-effet (pharmacokinetic-pharmacodynamic or PK-PD) relationships. Serum trough concentrations of infliximab have been shown to be variable between patients receiving the same treatment regimen. This PK variability may be explained by several factors (e.g. genetic and immunological factors). The concentration-effect relationship may also be variable and the sources of this variability need to be studied as well. To date no detailed infliximab PK analysis has been published. The sources of variability of the dose-effect relationship need to be characterized to optimize infliximab dosing regimen in patients. The FAKIR study is a multicenter prospective observational study that will focus on patients treated with infliximab. Its aims are: to characterize the PK and PK-PD variability of infliximab in RA, using clinical criteria and biomarkers, assessed over time ; to study the influence of the polymorphism of FCGRT (the gene encoding FcRn) on the PK variability of infliximab; to study the influence of the polymorphism of FCGR3A (the gene encoding Fc gamma RIIIa) on the PK-PD variability of infliximab; and to study the influence of antibodies toward infliximab on the PK and PK-PD variabilities of infliximab.

Official Title
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Pharmaco Kinetic and Pharmacokinetic-Pharmacodynamic Variability of Infliximab

Conditions
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Rheumatoid Arthritis

Intervention / Treatment
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* Biological: infliximab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Rheumatoid arthritis according to ACR criteria Patient already receiving infliximab for more than 14 weeks No modification of the dose regimen of infliximab since the last infusion No modification of disease modifying anti rheumatic drugs since the last 4 weeks Exclusion Criteria: Surgery scheduled during the duration of the study Pregnancy infection, malignancy, immune reaction to infliximab or demyelinating diseases

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| A<br>Rhumatoid arthritis patient currently receiving infliximab | Biological: infliximab<br>* chimeric monoclonal antibody to Tumor Necrosis Factor-alpha<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Characterizing the PK and PK-PD variability of infliximab in RA |  | 6 to 12 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Studying the relation between FCGRT polymorphism and the PK variability of infliximab; the relation between FCGR3A polymorphism and the PK-PD variability of infliximab; and the relation between ATI and the PK and PK-PD variabilities of infliximab |  | 6 to 12 weeks |