68Ga-FAPI has been developed as a tumor-targeting agent as fibroblast activation protein is overexpressed in cancer-associated fibroblasts and some inflammation, such as IgG4-related disease and inflammatory bowel disease. Some researches identified FAP expression in synovial samples taken from both rheumatoid arthritis and osteoarthritis patients.Thus this prospective study is going to investigate whether 68Ga-FAPI PET/CT may be superior for diagnosis, therapy response assessment and follow-up of arthritis than 18F-FDG PET/CT.
Arthritis is a term used to mean any disorder that affects the joints. The two most common forms of arthritis are osteoarthritis and rheumatoid arthritis.Rheumatoid arthritis is an autoimmune chronic inflammatory disease of unknown etiology and is characterized by chronic inflammation of the joint capsule's synovial membrane. This chronic inflammation ultimately destroys the underlying cartilage and bone. Activated fibroblast-like synoviocytes (FLS) line the synovial membrane and are a prominent cell type responsible for inflammation and joint destruction. Osteoarthritis is characterized by degradation of joint cartilage. Studies demonstrate chondrocytes expressed FAP and that chondrocyte FAP expression was elevated in patients with osteoarthritis. Other researches identified FAP expression in synovial samples taken from both rheumatoid arthritis and osteoarthritis patients. However, FAP expression was greater in samples taken from refractory rheumatoid arthritis patients in comparison to end-stage osteoarthritis patients.68Ga-FAPI has been developed as a tumor-targeting agent as fibroblast activation protein is overexpressed in cancer-associated fibroblasts and some inflammation, such as IgG4-related disease and inflammatory bowel disease. Recently the investigators have published an article of the application of 68Ga-FAPI in IgG4-related disease which showed it was more sensitive than FDG in detecting a certain type of inflammations. Thus this prospective study is going to investigate whether 68Ga-FAPI PET/CT may be superior for diagnosis, therapy response assessment and follow-up of arthritis than 18F-FDG PET/CT.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
100
Intravenous injection of one dosage of 74-148 MBq (2-4 mCi) 68Ga-FAPI. Tracer doses of 68Ga-FAPI will be used to image lesions of arthritis by PET/CT.
Peking Union Medical College Hospital
Beijing, Beijing Municipality, China
RECRUITINGDiagnostic value
Sensitivity and Specificity of 68Ga-FAPI PET/CT for IgG4-RD in comparison with 18F-FDG PET/CT.
Time frame: through study completion, an average of 1 year
Metabolic parameters
Total Lesion Glycolysis (TLG) of focal lesions are measured on 68Ga-FAPI PET/CT.
Time frame: Time Frame: through study completion, an average of 1 year
Disease burden assessement
whether Total Lesion Glycolysis (TLG) assessed on 68Ga-FAPI PET/CT was correlated with clinical parameters for arthritis using correlation coefficients analysis
Time frame: through study completion, an average of 1 year
FAPI expression and SUV
Correlation between FAPI expression and SUV in PET
Time frame: through study completion, an average of 1 year
Therapy response
Change of Total Lesion Glycolysis (TLG) on 68Ga-FAPI PET/CT after therapy
Time frame: through study completion, an average of 1 year
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