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Epidemiological study of gastroenteropancreatic neuroendocrine tumors in Japan.

Abstract：

BACKGROUND:There have been few epidemiological studies on gastroenteropancreatic neuroendocrine tumors (GEP-NETs) in Japan. METHODS:We examined the epidemiology of GEP-NETs [pancreatic endocrine tumors (PETs) and gastrointestinal neuroendocrine tumors (GI-NETs)] in Japan in 2005 using a nationwide stratified random sampling method. RESULTS:A total of 2,845 individuals received treatment for PETs. Prevalence was estimated as 2.23/100,000 with an annual onset incidence of 1.01/100,000. Non-functioning tumor (NF)-PET constituted 47.4%, followed by insulinoma (38.2%) and gastrinoma (7.9%). Distant metastases were reported in 21% patients with NF-PETs and occurred more frequently as tumor size increased (>2 cm). Multiple endocrine neoplasia type 1 (MEN-1) was detected in 10% of PETs but only in 6.1% of NF-PETs. NF-PETs were detected incidentally by physical examination in 24% patients. In 2005, an estimated 4,406 patients received treatment for GI-NETs. Prevalence was estimated as 3.45/100,000, with an annual onset incidence of 2.10/100,000. The locations of GI-NETs varied: foregut, 30.4%; midgut, 9.6%; and hindgut, 60.0%. Distant metastases were observed in 6%. Lymph node metastases occurred more frequently as tumor size increased (>1 cm). The frequency of MEN-1 complications was 1%. Physical examination revealed GI-NETs in 44% patients. The frequency of symptomatic GI-NETs was 3.4%. Interestingly, 77.1% of patients with foregut GI-NETs had type A gastritis. CONCLUSION:Our results show there are large differences in GEP-NETs between Japan and Western nations, primarily due to differences in the presence of MEN-1 in NF-PETs and the location, symptomatic status, and prevalence of malignancy in GI-NETs.

journal_name

J Gastroenterol

journal_title

Journal of gastroenterology

authors

Ito T,Sasano H,Tanaka M,Osamura RY,Sasaki I,Kimura W,Takano K,Obara T,Ishibashi M,Nakao K,Doi R,Shimatsu A,Nishida T,Komoto I,Hirata Y,Nakamura K,Igarashi H,Jensen RT,Wiedenmann B,Imamura M

doi

10.1007/s00535-009-0194-8

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

234-43

issue

2

eissn

0944-1174

issn

1435-5922

journal_volume

45

pub_type

杂志文章

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