Prophylactic Cholecystectomy in Midgut NETs Patients Who Require Primary Tumor Surgery.

Title: Effectiveness of prophylactic cholecystectomy in patients with midgut neuroendocrine tumor (jejunum, ileum or proximal colon) who require primary tumor surgery. Randomized, proof of concept clinical trial. Background: The prevalence of midgut NET has increased due to advances in diagnostic tests and its indolent course. When patients are diagnosed, they might be tributary to surgical treatment requiring an extensive bowel resection, and medical treatment with somatostatin analogs. Both treatments are related with gallbladder stone formation. The ENETS and NANETs recommend prophylactic cholecystectomy in patients with midgut NET who require primary tumor surgery, However, there is a lack of scientific evidence reinforcing this recommendation. Objectives: The main objective is to evaluate the cumulated incidence rate of biliary stone disease in patients with midgut NET who require primary tumor resection, two years after the surgery. Design: It's a multicentric, open-label and randomized clinical trial. Patients will be recruited from the General Surgery Services of the six Hospitals participating in the study. Patients must fullfill inclusion and exclusion criteria. It is expected to recruit a maximum of one hundred patients in two years (50 per group). Patients will be randomly assigned into the Experimental group (primary tumor resections) or Control group (primary tumor resections combined with cholecystectomy). The investigators will follow up patients until week 104 after surgery (8 visits).