Myositis Clinical Trial
Official title:
Characterizing Myositis With 68Ga-FAPI PET/CT
To evaluate the potential usefulness of 68Ga-FAPI PET/CT for the diagnosis and evaluation of systemic involvement in idiopathic inflammatory myopathies (IIM)/myositis, and compared the results with those of 18F-FDG PET/CT.
Inflammatory myopathies (IIM), collectively known as myositis, are heterogeneous systemic autoimmune disorders characterized by muscle inflammation, and frequently accompanied by extra-muscular manifestations that affect the skin, lung, and joints. Prevalence of underlying malignancy is high in patients with IIM. 68Ga-FAPI has been developed as tracers specific for fibroblast-activation protein (FAP), which is overexpressed in activated fibroblasts in various type of cancers and autoimmune diseases, such as rheumatoid arthritis, IgG4-related diseases and interstitial lung diseases. Recently the investigators have published articles of the application of 68Ga-FAPI in IgG4-related disease and rheumatoid arthritis, which showed it was more sensitive than FDG in detecting a certain type of inflammation, and the potential utility of FAP-targeted PET/CT imaging for disease assessment in myositis have been reported in a case recently. Thus, this prospective study is going to investigate utility of 68Ga-FAPI PET/CT in diagnosis, disease assessment including skeletal muscle involvement, cardiac involvement, interstitial lung diseases and potential underlying cancer screening, response to treatment and prognosis, compared with 18F-FDG PET/CT. ;
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