Determining the role of adjuvant therapy in Invasive Intraductal Papillary Mucinous Neoplasms; a systematic review and meta-analysis

Background: Conflicting evidence exists regarding the role of adjuvant therapy for Invasive Intraductal Papillary Mucinous Neoplasms (i-IPMN). This meta-analysis assessed whether adjuvant therapy improves Overall Survival (OS) in patients with resected i-IPMN. Methods: A systematic review and meta-analysis was performed. The primary endpoint was the effect of adjuvant therapy on OS. Secondary endpoint evaluated adjuvant therapy with regard to nodal disease, positive resection margins, tumour grade and differentiation. A meta-analysis of pooled hazard ratios (HRs) with an inverse variance and a random-effects model was performed. Risk of bias was determined with the GRADE approach and MINORS criteria. Results: Ten articles with a total of 3252 patients were included. No statistically significant difference in the OS was noted with adjuvant therapy for i-IPMN in the entire cohort (HR = 1; 95% CI = 0.75-1.35; P = 0.98). However, a survival benefit was noted in a subgroup of patients with an aggressive disease phenotype; nodal involvement (HR = 0.56; 95% CI = 0.39-0.79; P = 0.001) and advanced staged tumours (>= stage 2, HR = 1.42; 95% CI = 1.11-1.82; P = 0.005) Conclusions: The concurrent evidence base for adjuvant therapy for i-IPMN is limited. After acknowledging the limitations of the data, the current literature suggests that adjuvant therapy should be reserved for patients with resected i-IPMN that have adverse tumour biology. (C) 2022 Elsevier Ltd, BASO similar to The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved.