An observational study in Giant Cell Arteritis and Takayasu Arteritis, sponsored by University of Cambridge. Active, not recruiting at 2 sites in United Kingdom. Open to participants aged 18 Years to 99 Years. Per ClinicalTrials.gov, last updated 2024-07-22.
Sponsored by University of Cambridge · Observational
While 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) imaging is often included in the diagnostic work-up of patients with large-vessel vasculitis (LVV), 18F-FDG lacks specificity for inflammatory cells and has limited ability to track therapy response. Moreover, high background 18F-FDG uptake in the brain and myocardium largely precludes imaging temporal arteritis in giant-cell arteritis (GCA) and coronary artery involvement in Takayasu arteritis respectively. These limitations of 18F-FDG for imaging LVV highlight important unmet clinical needs, which might be overcome by using a somatostatin receptor subtype-2 (SST2) PET tracer.
Up-regulation of SST2 in activated macrophages represents a novel imaging target for measuring vascular inflammation, which has been previously examined in atherosclerosis using 68Ga-DOTATATE. To test the hypothesis that SST2 PET imaging can accurately identify LVV, patients with active GCA or Takayasu arteritis will undergo vascular 68Ga-DOTATATE or 18F-fluoroethyltriazole-(Tyr3)-octreotate (FETO) PET-MRI at baseline, with repeat imaging after 6 months of treatment. A group of individuals with LVV in clinical remission will also undergo SST2 PET imaging. Data from patients with clinically inactive disease will serve to confirm tracer specificity for active disease, as well as signal reproducibility. 18F-FETO is an alternative SST2 tracer to 68Ga-DOTATATE; the longer half-life and shorter positron range of 18F compared to 68Ga may offer several advantages, including wider tracer availability and improved spatial resolution when imaging small arteries. All patients will also undergo 18F-FDG imaging before treatment, where clinically indicated.
147 studies on the registry are indexed under Giant Cell Arteritis; 49 are open to participants now.
This study's enrollment of 27 is below the median of 128 across 78 observational studies indexed under Giant Cell Arteritis.
Browse Giant Cell Arteritis studies →University of Cambridge is the lead sponsor of 116 studies on the registry; 23 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Patients with LVV
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Either:
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Patients with active LVV
Diagnostic Test: PET-MRI
Patients with inactive LVV
Diagnostic Test: PET-MRI
SST2 PET-MRI scan
Diagnostic accuracy of SST2 PET-MRI for LVV
To determine the diagnostic accuracy of SST2 PET-MRI for LVV, with the clinically adjudicated diagnosis as the gold-standard.
Time frame: Baseline
Treatment response
To compare vascular SST2 PET pre- and post-treatment for LVV
Time frame: 6 months
Active versus inactive disease
To compare vascular SST2 PET in patients with active disease versus inactive disease
Time frame: Baseline
Comparison with biochemical markers of disease severity
To compare SST2 PET to C-reactive protein (CRP)
Time frame: Baseline and 6 months
Comparison with clinical measures of disease severity
To compare SST2 PET to clinical disease activity scores
Time frame: Baseline and 6 months
Comparison of SST2 PET tracers
To compare 68Ga-DOTATATE PET to 18F-FETO PET
Time frame: Baseline and 6 months
Plan to share: No
Started Jun 2019 (actual). Primary completion is estimated for Apr 2025, 70 months after the start.
Of 44 observational studies under Giant Cell Arteritis, half reached primary completion within 45 months of starting (the median), counting those still running; a quarter within 33 and three quarters within 164. This study's planned 70 months is above that.
How these figures are worked out, and which studies are left out of them.
This study is active, not recruiting, as verified in Jul 2024. You cannot join it, but the record below documents what was studied.
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