ecrin-mdr-crcClinical2005Colorectal cancerColorectal NeoplasmsColorectal Neoplasms, Hereditary NonpolyposisColorectal CancerColorectal NeoplasmsColorectal Neoplasms, Hereditary NonpolyposisInterventionalhttps://newmdr.ecrin.org/Study/2021348France7ColoscopyHNPCCHereditary NonpolyposisChromoscopyDiagnosisIndigo carmineECRIN MDRCompletedfalseCHROENDOHNPCC: Early Detection of Pre-cancer Lesions in Adults With Hereditary Nonpolyposis Colorectal Cancer SyndromeThe aim of the study is to test the hypothesis that a chromoscopy colonoscopy is able to increase by 50 % the number of pre-cancer lesions or early cancer detected in patients with HNPCC syndrome, compared to a routine colonoscopy without chromoscopy.2005-07-152021348NCT00224601