Overview
Adenomatous polyposis coli (APC) syndromes, including familial adenomatous polyposis (FAP) and other rare forms like MUTYH-associated polyposis (MAP) and gastric adenocarcinoma, proximal polyposis of the stomach (GAPPS), are hereditary conditions characterized by an increased risk of colorectal and other cancers due to mutations in the APC gene 1.Diagnosis
Genetic Testing: Identification of APC gene mutations is crucial for diagnosis 1.
Colonoscopy: Regular colonoscopies to detect numerous polyps, typically hundreds to thousands, are essential 1.
Exon Analysis: Specific exon analysis can help identify different isoforms and mutations affecting APC function 3.Management
Surgical Intervention: Total colectomy is recommended to prevent colorectal cancer development 1.
Surveillance: Frequent endoscopic surveillance to monitor polyp burden and early detection of adenomas 1.
Chemoprevention: Use of nonsteroidal anti-inflammatory drugs (NSAIDs) may reduce polyp formation, though specific dosing is not detailed in the abstracts 1.Special Populations
Pregnancy: Management strategies should consider the impact on maternal and fetal health; tailored surveillance protocols are advised 1.
Pediatrics: Early genetic counseling and surveillance initiation post-diagnosis to monitor polyp development 1.
Elderly: Tailored surveillance based on life expectancy and overall health status, balancing risks and benefits 1.Key Recommendations
Genetic Testing and Counseling: Essential for diagnosis and family screening (Evidence: Strong 1).
Regular Colonoscopy Surveillance: Initiate early and maintain frequent intervals to monitor polyp burden (Evidence: Strong 1).
Total Colectomy: Recommended to mitigate colorectal cancer risk (Evidence: Strong 1).References
1 Zaffaroni G, Mannucci A, Koskenvuo L, de Lacy B, Maffioli A, Bisseling T et al.. Updated European guidelines for clinical management of familial adenomatous polyposis (FAP), MUTYH-associated polyposis (MAP), gastric adenocarcinoma, proximal polyposis of the stomach (GAPPS) and other rare adenomatous polyposis syndromes: a joint EHTG-ESCP revision. The British journal of surgery 2024. link
2 Nathke I. Inke Nathke: The ABCs of APC. Interview by Caitlin Sedwick. The Journal of cell biology 2010. link
3 Kraus C, Reina-Sanchez J, Suleková Z, Ballhausen WG. Immunochemical identification of novel high-molecular-weight protein isoforms of the adenomatous polyposis coli (APC) gene. International journal of cancer 1996. link1097-0215(19960126)65:3<383::AID-IJC18>3.0.CO;2-B)