Systematic Review and Meta-Analysis Comparing the Surgical Outcomes of Invasive Intraductal Papillary Mucinous Neoplasms and Conventional Pancreatic Ductal Adenocarcinoma

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Abstract
The aim of this study was to summarize the current literature comparing the surgical outcomes of invasive intraductal papillary mucinous neoplasms (IPMNINV) and conventional pancreatic ductal adenocarcinomas (PDAC) in order to determine the differences in disease characteristics and prognosis. Systematic review of the literature yielded 12 comparative studies reporting the clinicopathological characteristics and overall survival (OS) of 1,450 patients with IPMNINV with 19,304 patients with conventional PDAC. IPMNINV had a significantly lower likelihood of tumors extending beyond the pancreas [27.6 vs. 94.3 %; T4 vs. T1: odds ratio (OR) 0.111, 95 % confidence intervals (CI) 0.057–0.214], nodal metastasis (45.4 vs. 62.9 %: OR 0.507, 95 % CI 0.347–0.741), positive margin (14.2 vs. 28.3 %; OR 0.438, 95 % CI 0.322–0.596), perineural invasion (49.2 vs. 76.5 %; OR 0.304, 95 % CI 0.106–0.877) and vascular invasion (25.2 vs. 45.7 % OR 0.417, 95 % CI 0.177–0.980) when compared with PDAC. The 5-year OS of IPMNINV was significantly better than PDAC [31.4 vs. 12.4 %: hazard ratio (HR) 0.659, 95 % CI 0.574–0.756]. The tubular subtype had a poorer 5-year OS and demonstrated significantly more aggressive features such as nodal metastases, vascular invasion, and perineural invasion compared with the colloid subtype. IPMNINV were significantly more likely to present at an earlier stage and were less likely to demonstrate nodal involvement, perineural invasion and vascular invasion. When controlled for stage, IPMNINV had an improved OS when compared with PDAC in the early stages.

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