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About
The purpose of this study is to use abatacept as a clinical molecular probe to evaluate the effects of inhibiting costimulation on immune responses in patients with rheumatoid arthritis (RA).
Full description
Rheumatoid arthritis (RA) is a chronic inflammatory immune mediated arthritis which leads to pain, swelling and destruction of joints. RA affects more than 500,000 subjects in the United Kingdom (UK) and incurs significant health and economic cost. Most patients require potent immune suppressing drugs such as methotrexate, which help reduce pain and stiffness, and protect the joints against damage. However, many patients do not respond or are unable to tolerate methotrexate. In these patients, biologic drugs such as abatacept are used to try to control the arthritis.
Abatacept is designed to target and inhibit a specific molecule involved in "costimulation" of the inflammatory signal that is thought to be important in RA. While abatacept has been shown to be effective in trials and clinical practice, the exact mechanism of action of abatacept in RA has not been fully elucidated. Understanding these actions is likely to inform both the use of abatacept in RA and lead to increased understanding of inflammation in humans with implications for further therapies. This six month prospective open label study, therefore, aims to investigate the effects of inhibiting costimulation on a variety of important inflammatory cell types and processes in humans with RA.
25 participants with RA who have bad prognostic genetic markers (Anti-citrullinated protein antibodies (ACPA) and human leukocyte antigen (HLADR4) and who were scheduled to receive subcutaneous abatacept as part of their standard clinical treatment will be recruited. Consenting participants will followed for a total of 24 weeks during which time they will have additional venous blood and urine samples taken to investigate the effects of abatacept on their immune cells and system. The primary endpoint of the study is the characterisation of the immune response following costimulatory modulation in RA patients at 12 weeks. Secondary endpoints include change in immunological response and its association with clinical outcome measures up to 24 weeks.
Enrollment
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Inclusion criteria
RA as defined by the 2010 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria
Eligible for abatacept therapy according to local/national guidelines
Be able to tolerate methotrexate at dose of 10-25mg/week, either orally or subcutaneously
Anti-cyclic citrullinated peptide (CCP) positive
Human leukocyte antigen D related (HLA-DR) B1*0401 or 0404) positive
Able and willing to give written informed consent and comply with the requirements of the study protocol
Exclusion criteria
Primary purpose
Allocation
Interventional model
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25 participants in 1 patient group
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Central trial contact
Stefan Siebert, Dr; Iain McInnes, Prof
Data sourced from clinicaltrials.gov
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