Epidemiological trends of pancreatic and gastrointestinal neuroendocrine tumors in Japan: a nationwide survey analysis

Tetsuhide Ito, Hisato Igarashi, Kazuhiko Nakamura, Hironobu Sasano, Takuji Okusaka, Koji Takano, Izumi Komoto, Masao Tanaka, Masayuki Imamura, Robert T. Jensen, Ryoichi Takayanagi, Akira Shimatsu

Research output: Contribution to journalArticlepeer-review

156 Citations (Scopus)

Abstract

Background: Although neuroendocrine tumors (NETs) are rare, the number of patients with NET is increasing. However, in Japan, there have been no epidemiological studies on NET since 2005; thus, the prevalence of NET remains unknown.

Methods: We reported the epidemiology of gastroenteropancreatic neuroendocrine tumors (GEP-NETs) [pancreatic neuroendocrine tumors (PNETs) and gastrointestinal neuroendocrine tumors (GI-NETs)] in Japan in 2005. Here, we conducted the second nationwide survey on patients with GEP-NETs who received treatment in 2010.

Results: A total of 3,379 patients received treatment for PNETs in 2010, representing a 1.2-fold increase in the number of patients from 2005 to 2010. The prevalence was estimated to be 2.69/100,000, with an annual onset incidence of 1.27/100,000 in 2010. Non-functioning tumor (NF)-PNETs comprised 65.5 % of cases followed by insulinoma (20.9 %) and gastrinoma (8.2 %). Interestingly, the number of patients with NF-PNETs increased ~1.8 fold since 2005. A total of 19.9 % of patients exhibited distant metastasis at initial diagnosis; 4.3 % had complications with multiple endocrine neoplasia type 1 (MEN-1), and only 4.0 % had NF-PNETs associated with MEN-1. Meanwhile, an estimated 8,088 patients received treatment for GI-NETs, representing a ~1.8-fold increase since 2005. The prevalence was estimated to be 6.42/100,000, with an annual onset incidence of 3.51/100,000. The locations of GI-NETs varied: foregut, 26.1 %; midgut, 3.6 %; and hindgut, 70.3 %. Distant metastasis and complications with MEN-1 were observed in 6.0 and 0.42 % at initial diagnosis, respectively. The frequency of carcinoid syndrome in patients with GI-NETs was 3.2 %.

Conclusion: We clarified the epidemiological changes in GEP-NETs from 2005 to 2010 in Japan.

Original languageEnglish
Pages (from-to)58-64
Number of pages7
JournalJournal of gastroenterology
Volume50
Issue number1
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • Epidemiology
  • Gastrointestinal neuroendocrine tumor
  • Nation-wide survey
  • Neuroendocrine tumor
  • Pancreatic neuroendocrine tumor

ASJC Scopus subject areas

  • Gastroenterology

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