Intestinal transplantation in Familial Adenomatous Polyposis.

In patients with Familial Adenomatous Polyposis (FAP), large desmoid tumors can develop all over the body. However, the most frequent presentation is as large intra-abdominal masses, usually located in the mesentery of the small bowel. From there, they tend to grow and invade both the abdominal wall and/or the retroperitoneal structures. This can cause life-threatening complications such as recurrent abdominal sepsis with fistulation and damage to vital organs. In selected patients, the only option may be radical resection and replacement by intestinal transplantation (ITx). We aimed to review all the current literature on ITx for FAP-related desmoids and provide an update from the largest single-center experience (2007-2024). All patients undergoing ITx for FAP-related desmoid were included. Between 2007 and 2024, 166 ITx was performed in 158 patients at Addenbrooke's Hospital, Cambridge, UK. Of these, 20 (12%) were for desmoid associated with FAP (10 modified multivisceral transplants, 8 isolated ITx and 2 liver-containing grafts). The five-year all-cause patient survival was 92%, median follow-up was 4.3 years. As the patients presented with very advanced disease, many technical challenges were faced such as: extensive ureteric involvement, abdominal wall fistulation, management of previously formed ileo-anal pouches and extra-abdominal recurrences. Graft selection was another evolving issue, as foregut resection- versus sparing techniques require careful preoperative risk stratification due to increased long-term cancer risk in FAP patients. For certain patients with advanced FAP/desmoid disease, ITx can allow for a radical resection with excellent survival and functional outcomes. However, there is a high degree of initial morbidity associated with the operation and patients should be appropriately counselled. Graft selection and degree of native organ resection requires a careful balanced discussion.