Volume 22, Issue 10 pp. 757-765
Original Article

Risk factors for postoperative recurrence of intraductal papillary mucinous neoplasms of the pancreas based on a long-term follow-up study: proposals for follow-up strategies

Tatsuji Yogi

Tatsuji Yogi

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

Department of Infectious, Respiratory, and Digestive Medicine, Control and Prevention of Infectious Diseases (First Department of Internal Medicine), Faculty of Medicine, University of the Ryukyus, Okinawa, Japan

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Susumu Hijioka

Corresponding Author

Susumu Hijioka

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

Correspondence to: Susumu Hijioka, Department of Gastroenterology, Aichi Cancer Center Hospital, 1-1 Kanokoden, Chikusa-ku, Nagoya 464-8681, Japan.

Email: [email protected]

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Hiroshi Imaoka

Hiroshi Imaoka

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

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Nobumasa Mizuno

Nobumasa Mizuno

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

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Kazuo Hara

Kazuo Hara

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

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Masahiro Tajika

Masahiro Tajika

Department of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan

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Tsutomu Tanaka

Tsutomu Tanaka

Department of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan

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Makoto Ishihara

Makoto Ishihara

Department of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan

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Yasuhiro Shimizu

Yasuhiro Shimizu

Department of Gastrointestinal Surgery, Aichi Cancer Center Hospital, Nagoya, Japan

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Waki Hosoda

Waki Hosoda

Department of Pathology and Molecular Diagnostics, Aichi Cancer Center Hospital, Nagoya, Japan

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Yasushi Yatabe

Yasushi Yatabe

Department of Pathology and Molecular Diagnostics, Aichi Cancer Center Hospital, Nagoya, Japan

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Yasumasa Niwa

Yasumasa Niwa

Department of Endoscopy, Aichi Cancer Center Hospital, Nagoya, Japan

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Kenichi Yoshimura

Kenichi Yoshimura

Innovative Clinical Research Center, Kanazawa University, Kanazawa, Japan

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Vikram Bhatia

Vikram Bhatia

Department of Hepatology, Institute of Liver and Biliary Sciences, Delhi, India

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Jiro Fujita

Jiro Fujita

Department of Infectious, Respiratory, and Digestive Medicine, Control and Prevention of Infectious Diseases (First Department of Internal Medicine), Faculty of Medicine, University of the Ryukyus, Okinawa, Japan

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Kenji Yamao

Kenji Yamao

Department of Gastroenterology, Aichi Cancer Center Hospital, Nagoya, Japan

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First published: 03 July 2015
Citations: 34

Abstract

Background

The aim of this study was to examine the associations between postoperative clinicopathological features of intraductal papillary mucinous neoplasm (IPMN) and recurrence over a long follow-up period.

Methods

We retrospectively assessed 153 IPMN patients who underwent resection.

Results

The resected tumors showed low/intermediate-grade dysplasia (LGD/IGD), high-grade dysplasia (HGD), T1a (stromal invasion ≤5 mm), and invasive intraductal papillary mucinous carcinoma (IPMC), in 54.9%, 22.2%, 4.6%, and 18.3% of patients, respectively. The median follow-up period after surgery was 46.4 (6.0–216.3) months, with an overall recurrence rate of 17.0%; the recurrence rates by histological type were 6.0%, 5.9%, 42.9%, and 57.1% for LGD/IGD, HGD, T1a, and invasive IPMC, respectively. Multivariate analysis revealed that recurrences related with tumor location, mural nodule size, presence of invasive cancer, lymph node metastasis, IPMN in the remnant pancreas, and main pancreatic duct dilatation after surgery. Recurrence occurred within the remnant pancreas in all LGD-T1a patients and as extrapancreatic metastasis in all patients with invasive IPMC. Of the total recurrences, 15.4% occurred over 5 years postoperatively.

Conclusions

The postoperative follow-up protocol for patients with LGD-T1a should be similar to non-resected IPMN, and that for invasive IPMC should be the same as for pancreatic ductal adenocarcinoma patients.

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