To evaluate two competitive strategies in patients undergoing resection of Small-intestine Neuroendocrine neoplasms (Si-NEN): Prophylactic Cholecystectomy (PC) versus On-demand delayed cholecystectomy

This is a retrospective study based on 230 Si-NENs candidates to the primary tumor resection. Patients were divided into two arms: PC and OC. Propensity score matching was performed, reporting the d value. The primary outcome was the re-hospitalization rate for any cause. The secondary endpoints were the re-hospitalization rate for biliary stone disease (BSD), the mean number of re-hospitalization (any cause and BSD), the complication rate (all and severe), and the total costs. A P-value < 0.05 was considered significant, and NNT< 10 was considered clinically relevant.

Inclusion Criteria:

• patients with a diagnosis of Si-NEN;
• resection of the primary tumor with or without concomitant cholecystectomy;
• absence of a history of a biliary stone disease or cholecystectomy before Si-NEN diagnosis

Exclusion Criteria:

- presence of a history of a biliary stone disease or cholecystectomy before Si-NEN diagnosis

For each patient sex, age, comorbidity, presence of symptoms, type of surgery (emergency or elective), ENETS TNM stage, WHO 2019 grading of the primary tumor, type of resection (R0/1 vs. R2), administration of SSA therapy, duration of follow-up, were collected