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Patterns of Recurrence After Resection of IPMN: Who, When, and How?
Giovanni Marchegiani1, Mari Mino-Kenudson, Cristina R Ferrone
1*Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA †Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
Objective:
To describe the patterns of recurrence after resection of intraductal papillary mucinous neoplasms (IPMN) of the pancreas.
Background:
IPMNs represent an increasing indication for pancreatic resection, but little is known about the actual incidence and the patterns of recurrence after surgical excision.
Methods:
Retrospective review of 412 resected IPMNs from 1990 to 2013 who have had near-complete follow-up.
Results:
Median age of the cohort was 68 years, 56% had branch duct (BD)-IPMN and 21% had invasive cancers. Nineteen patients (5%) had distinct pancreatic ductal adenocarcinoma (PDAC) and were excluded from the recurrence analysis. After a median of 58 months, 65 of 381 patients (17%) experienced recurrence of the IPMN, and 5- and 10-year disease-free survival (DFS) was 82% and 78%, respectively. Only 2 patients (0.5%) developed metachronous PDAC. In 33 patients (9%), a residual BD-IPMN was left in the pancreatic remnant, but none of these significantly grew or required reoperation. Invasive component and resection margin positive for IPMN were predictors of recurrence (P < 0.05). Invasive IPMN recurred in 45% of cases, whereas noninvasive in only 9% and later (P < 0.001), but patterns depended on IPMN subtypes. Only 9 patients required reoperation for recurrence, with good long-term outcome particularly for oncocytic IPMNs.
Conclusions:
Recurrence of noninvasive BD-IPMN is infrequent and surveillance may be avoided in selected cases. In invasive IPMN recurrence depends on N status, pancreatic margin, and invasive type.
