- •Pancreatobiliary-type IPMNs are the most likely to become invasive with poorest prognosis.
- •The oncocytic-, intestinal- and gastric-type IPMNs have similar overall survivals.
- •The oncocytic- and intestinal-type IPMNs are more invasive than the gastric type.
Emerging evidence suggests the predictive role of morphological subtypes (gastric, intestinal, pancreatobiliary, and oncocytic) of intraductal papillary mucinous neoplasms (IPMNs) in malignant transformation and overall survival. But results of these studies are currently discordant.
A comprehensive literature search in MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials (CENTRAL) was conducted for eligible studies. Network meta-analysis using the random-effect model was carried out to detect differences in incidences of invasive IPMNs and hazard ratios from survival curves among four morphological subtypes.
19 studies were included in the network comparison. The outcomes showed that pancreatobiliary-type (OR for odds ratio = 25.87, 95% CI: 12.11–52.10, compared with gastric-type) and oncocytic-type (OR = 18.59, 95% CI: 7.18–42.74) IPMNs had the highest risks of progressing to invasive IPMNs, followed by intestinal-type (OR = 5.71, 95% CI: 2.85–10.61) and gastric-type IPMNs. With the gastric type as the baseline, pancreatobiliary-type IPMNs were found to have the worst prognosis (HR for hazard ratio = 5.05, 95% CrI: 1.33–13.47) while no significant differences were found for the intestinal type (HR = 1.90, 95% CrI: 0.59–4.58) and the oncocytic type (HR = 3.29, 95% CrI: 0.75–9.71).
It is suggested that pancreatobiliary-type IPMNs are the most likely to become invasive and are associated with poor prognosis. In contrast, the other three subtypes have similar overall survivals even though the oncocytic- and intestinal-type IPMNs are predisposed to be more invasive than gastric-type IPMNs.
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Published online: August 11, 2015
Accepted: July 19, 2015
Received in revised form: July 15, 2015
Received: May 27, 2015
© 2015 European Federation of Internal Medicine. Published by Elsevier Inc. All rights reserved.