Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
3285514 | Clinical Gastroenterology and Hepatology | 2006 | 9 Pages |
Abstract
Background & Aims: Natural history of intraductal papillary mucinous tumors of the pancreas (IPMTs) is unknown. Cross-sectional studies suggest that exclusive branch duct (BD) involvement is associated with a lower risk of carcinoma than main pancreatic duct (MPD) involvement. The aim of our study was to calculate longitudinal risk of malignant transformation of IPMT since the first sign. Methods: All the patients with a diagnosis of highly probable or histologically proven IPMT were included. Actuarial risks of occurrence of at least low-grade dysplasia (â¥LGD), high-grade dysplasia (â¥HGD), or invasive carcinoma (IC) were calculated by Kaplan-Meier method from the first sign attributable to IPMT. The risks according to sex, acute pancreatitis, tumor size, and involvement of MPD were compared by log-rank test. Results: One hundred six patients were included with a proven (n = 76) or probable (n = 30) IPMT. The tumor was confined to BD in 53 cases. Median duration since the onset of the first sign to the end of follow-up was 21 months (range, 0-241). Ten-year actuarial risk that IPMT grade was â¥LGD, â¥HGD, or IC was 67%, 49%, and 29%, respectively. The only morphologic risk factor of malignant transformation was involvement of MPD, with a 5-year actuarial risk of â¥HGD of 63% in the MPD group compared with 15% in the BD group (P < .001). Conclusions: Longitudinal risk of at least HGD or IC is time-dependent. Patients with BD IPMT present a much lower risk, justifying a nonoperative surveillance.
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Authors
Philippe Lévy, Vincent Jouannaud, Dermot O'Toole, Anne Couvelard, Marie Pierre Vullierme, Laurent Palazzo, Alain Aubert, Philippe Ponsot, Alain Sauvanet, Frédérique Maire, Olivia Hentic, Pascal Hammel, Philippe Ruszniewski,