Crohn Disease Clinical Trial
Official title:
A Prospective Study to Evaluate the Inflammation and Fibrosis of Intestinal Stricture in Patients With Crohn's Disease by 18F-FDG and 68Ga-FAPI PET/CT
Intestinal stricture is a complication of Crohn's disease (CD), which is thought to be the result of chronic transmural inflammation combined with a dysregulated wound-healing process. While inflammatory strictures may respond to anti-inflammatory treatment, fibrotic strictures are usually anti-inflammation resistant, requiring further endoscopic balloon dilation or surgical intervention. Therefore, to determinate the inflammatory or fibrotic nature of intestinal stricture is a key step in the treatment of CD. 18F-FDG is a radiotracer reflecting the glucose metabolism of disease and is usually accumulated in inflammatory disease. 68Ga-FAPI is a novel radiotracer that specifically targets fibroblast activation protein (FAP). FAP is a membrane glycoprotein expressed on activated fibroblasts, which are key cells in the process of fibrotic intestinal stricture of CD. In this study, we hypothesis that the inflammatory or fibrotic nature of intestinal stricture can be non-invasively evaluated by 18F-FDG and 68Ga-FAPI PET/CT in patients with CD.
Patients with intestinal stricture will undergo 18F-FDG and 68Ga-FAPI PET/CT on two consectutive days. The accumulation of 18F-FDG and 68Ga-FAPI at the site of stricture will be determined by standard uptake value (SUV), molecular volume (MV), and total molecular index (TMI). In patients with a planned surgical resection of one or more stricture (s), the image results will be compared with histological findings. ;
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