18F-FDG PET/CT for IgG4-Related Disease

Study Overview
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Brief Summary
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This is an open-label study to investigate the diagnostic performance of 18F-FDG PET/CT (positron emission tomography/computed tomography) in evaluation of patients with IgG4-related disease. A single dose of 18F-FDG will be intravenously injected into patients with IgG4-related disease before and after treatment.

Detailed Description
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Immunoglobulin G4-related disease (IgG4-RD) is a recently defined emerging clinical entity characterized by tissue infiltration by IgG4-positive plasma cells, tissue fibrosclerosis and elevated serum IgG4 concentration. The most important feature of IgG4-RD is chronic inflammation with multiple organ involvement. However, some organ involvements are difficult to find by ultrasound, CT or MRI. 18F-FDG PET/CT is a sensitive imaging tool for inflammation. In this study, PET/CT were performed in patients with IgG4-RD both before and after glucocorticoid treatment by a single dose of 18F-FDG. Visual and semiquantitative method will be employed to assess the PET/CT images. The PET/CT image data will be used to establish a diagnostic model as well as assessment criteria for response evaluation of IgG4-RD treatments.

Official Title
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Evaluation of 18F-FDG PET/CT in Diagnosis and Response Assessment of Patients With IgG4-Related Disease

Conditions
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Autoimmune Disease

Intervention / Treatment
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* Drug: 18F-FDG


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Males and females Age 18-75 years old with informed consent Patients with IgG4-RD: swelling, sclerosing and inflammatory involvement of one or more organ, including sclerosing pancreatitis, sclerosing cholangitis, inflammatory pseudotumors, retroperitoneal or mediastinal fibrosis, interstitial nephritis, hypophysitis, sclerosing dacryoadenitis, sialadenitis, inflammatory aortic aneurysm, lymphadenopathy, or other inflammatory conditions; elevated serum IgG4 (>1.35 g/L) or with histopathologic features of fibrosis and/or lymphocytic and polyclonal plasma cell infiltration (and IgG4+ plasma cells on immunohistology when performed); exclusion of other diseases. Exclusion Criteria: Females planning to bear a child recently or with childbearing potential; Inability to complete the examination; Concurrent severe and/or uncontrolled and/or unstable diseases; Currently under treatment using glucocorticoids.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 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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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 18F-FDG PET/CT scanning<br>18F-FDG PET/CT scanning will be performed in patients with IgG4RD to determine the pictorial characteristics and measure the standardized uptake values (SUVs) of the lesions and their response to treatment. | Drug: 18F-FDG<br>* Intravenous injection of single dose of 18F-FDG before treatment and after 4-week treatment, respectively.<br>* Other names: Fluorine-18-fluorodeoxyglucose;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Visual analysis of organ involvement and treatment response of the IgG4-RD patients. | Visual analysis will be performed by consensus reading by at least 3 experienced nuclear medicine physician. The 18F-FDG PET/CT pattern of IgG4-RG will be extracted and summarized. The response to anti-immune treatment will be assessed. | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Semiquantitative measurement of lesion metabolism and treatment response of the IgG4-RD patients. | The semiquantitative analysis will be performed by measuring the standardized uptake values (SUVs) of 18F-FDG by the IgG4-RD lesions and calculate the SUV changes before and after anti-immune treatment. | 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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IgG4-related disease, IgG4-RD, PET/CT, 18F-FDG