FP1.11 - An audit of post colonoscopy Colorectal cancers within a Northern Ireland Health and Social Care Trust

Abstract Background Post colonoscopy colorectal cancer (PCCRC) is defined as colorectal cancer found within 48 months of a colonoscopy in which no cancer was found. The British Society of Gastroenterology (BSG) proposes PCCRC rates as a key quality indicator of colonoscopy. Rates documented vary between 2-8%, with higher rates shown in Inflammatory Bowel disease (IBD). The English National Post Colonoscopy Colorectal Audit was established after recommendations from the World Endoscopy Organisation (WEO). We aim to establish the rates of PCCRC within this Health and Social Care Trust (HSCT). Method All CRCs diagnosed in our HSCT between January 2021 to December 2022 were retrospectively reviewed. Our definition for a PCCRC was one diagnosed between 0-48months after a colonoscopy. Information included whether the colonoscopy was complete, quality of bowel preparation, lesions detected, if resection of lesion was complete and if IBD was present. Results In this timeframe 524 CRCs were diagnosed in this HSCT, with 33(6.3%) having had a colonoscopy within the previous 48 months. Of the 33 PCCRCs, 21(63.6%) had a complete colonoscopy, 22(66.6%) had at least fair/satisfactory bowel preparation, 24(72.7%) had a lesion detected and 3(9%) had a prior diagnosis of IBD. Of those who had a lesion detected (n=24), 13(54%) had a complete resection and 10(41.6%) had a biopsy only or incomplete resection. Conclusions Our PCCRC detection rate is in keeping with previous published literature. Further analysis of the 33 cases should provide information on how we can reduce future PCCRCs.