Clinical trial NCT04507932: Characterizing Inflammatory Bowel Disease With 68Ga-FAPI PET/CT
Official title: Characterizing Inflammatory Bowel Disease With 68Ga-FAPI PET/CT
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: EARLY_PHASE1
Conditions: Inflammatory Bowel Disease
Lead sponsor: Peking Union Medical College Hospital
Sponsor class: OTHER
First posted: 2020-08-11
Enrollment: 100
Sex: ALL
Minimum age (years): 18
Maximum age (years): 90
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: DIAGNOSTIC

Brief summary: 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 inflammatory bowel disease. And it might be more sensitive than FDG in detecting a certain type of inflammations according to our preliminary research. 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 inflammatory bowel disease than 18F-FDG PET/CT.

Detailed description: Inflammatory bowel disease (IBD) is comprised of two major disorders: ulcerative colitis (UC) and Crohn's disease(CD).CD is an autoimmune condition resulting in chronic gut inflammation that can be complicated by intestinal fibrosis and stricture formation. Ulcerative colitis is characterized by recurring episodes of inflammation limited to the mucosal layer of the colon. It commonly involves the rectum and may extend in a proximal and continuous fashion to involve other parts of the colon. Studies identified FAP to be overexpressed in uninflamed strictures compared with nonstrictured colonic regions in biopsies taken from Crohn's disease patients. But preliminary studies showed FAP was not overexpressed in colonic biopsies taken from healthy individuals or individuals with ulcerative colitis.68Ga-FAPI has been developed as a tumor-targeting agent as fibroblast activation protein is overexpressed in cancer-associated fibroblasts and inflammation. Recently we 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 IBD than 18F-FDG PET/CT.

Eligibility criteria: Inclusion Criteria:

* suspected or confirmed untreated inflammatory bowel disease patients;
* 18F-FDG PET/CT within two weeks;
* signed written consent.

Exclusion Criteria:

* pregnancy;
* breastfeeding;
* known allergy against FAPI
* any medical condition that in the opinion of the investigator may significantly interfere with study compliance.

Primary outcomes:
measure: Diagnostic value
timeFrame: through study completion, an average of 1 year
Secondary outcomes:
measure: Metabolic parameters
timeFrame: through study completion, an average of 1 year
measure: FAPI expression and SUV
timeFrame: through study completion, an average of 1 year
measure: Disease burden assessement
timeFrame: through study completion, an average of 1 year
measure: therapy response
timeFrame: through study completion, an average of 1 year
Other outcomes:
Locations:
city: Beijing
country: China
facility: Peking Union Medical College Hospital
state: Beijing
Study officials:
affiliation: Peking Union Medical College Hospital
name: Yaping Luo, MD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Luo Y, Pan Q, Xu H, Zhang R, Li J, Li F. Active uptake of 68Ga-FAPI in Crohn's disease but not in ulcerative colitis. Eur J Nucl Med Mol Imaging. 2021 May;48(5):1682-1683. doi: 10.1007/s00259-020-05129-7. Epub 2020 Nov 27. No abstract available.