The goal of this clinical trial is to describe the transcriptomic and metabolomic profile of patients with chronic Calcium Pyrophosphate Deposition (CPPD) compared to those with acute CPPD.
The hypotheses are as follows :
* It is hypothesised that there is a transcriptomic and metabolomic signature of CPPD which explains why therapeutic responses to different anti-inflammatory treatments differ from one phenotype to another one
* It is hypothesised that the acute and chronic clinical phenotypes of CPPD have different clinical, biological and imaging characteristics, as well as a differing predisposition toward crystalline deposition and inflammatory pathway activation.
The management of participants with chronic forms of the disease included in this research was modelled on the usual recommended management, including a biological workup, joint puncture, ultrasound and radiographic workup. Double-energy CT scans and transcriptomic and metabolomic analyses on plasma are not routine tests.
Who can participate
Age range
65 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria - Acute forms of CPPD: retrospective part of the study
* Cases included in the COLCHICORT cohort (NCT03128905), for whom this was the first acute episode of CPPD
Inclusion Criteria - Chronical forms of CPPD : prospective part of the study
* Patients affiliated to the French social security system
* Age ≥ 65 years
* Diagnosis of chronic CPPD (recurrent acute or persistent arthritis), meeting ACR/EULAR 2023,11 classification criteria after evaluation by a rheumatologist in the rheumatology department
* Progression of CPPD rheumatism for at least 3 months and still active CPPD rheumatism, defined by a visual analogue scale (VAS) of disease activity ≥ 40 and/or presentation of at least 1 crisis over the last 3 months
* Glomerular Filtration Rate (GFR) in Chronic Kidney Disease Epidemiology (CKD EPI Collaboration) ≥ 30ml/min/1.73m2
* Minimum time between the last intake of a crisis treatment and inclusion in the study, depending on their half-life, in order to not interfere with the results of the omics analyses: 2 weeks (Nonsteroidal Anti-Inflammatory Drugs Per Os (PO) or Intramuscular (IM) or Intravenous (IV); corticosteroids PO or IV; colchicine PO; anakinra Subcutaneous (SC), 1 month (methotrexate PO, tocilizumab SC), 3 months (canakinumab SC, tocilizumab IV)
* Signed written consent for study participation
Exclusion Criteria - Acute forms of CPPD:
* Missing data concerning transcriptomic and metabolomic analyses.
* Opposition
Exclusion Criteria - For …
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.