Microbial and Environmental Factors Associated with Polyps Development in Familial Adenomatous Polyposis (MicrobEnvironment in FAP)

"* Blood sampling (plasmotheque and serotheque): 2 tubes (EDTA (5mL) and dry (5mL)) during hospitalization~* Fecal sampling (fecal library): A stool sample (approx. 2g) will be taken 48 hours before the endoscopy at home for outpatient or during hospitalization~* Duodenal aspiration fluid (6-10 mL in total): before and after mucosal lavage with sterile isotonic saline on the day of endoscopy.~* Food and Lifestyle Questionnaire (FFQ) during inclusion"