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IJE Advance Access published online on March 11, 2004
International Journal of Epidemiology, doi:10.1093/ije/dyh053
© 2004 by International Epidemiological Association
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Accepted October 15, 2003

Original paper

Trends in reported incidences of gastric cancer by tumour location, from 1975 to 1989 in Japan

Ying Liu 1*, Satoshi Kaneko 1, Tomotaka Sobue 1

1 Cancer Information and Epidemiology Division, Research Institute, National Cancer Center, Tokyo.

* To whom correspondence should be addressed. E-mail: yliu{at}gan2.res.ncc.go.jp.


  Abstract

Background This study was performed to estimate the incidence of gastric cancer by tumour location and to clarify whether the relative and absolute rates of gastric cancer in Japan changed between 1975 and 1989.

Methods The stomach was anatomically divided into the upper, middle, and lower thirds. Age- and sex-specific incidences by tumour location were estimated by multiplying the age- and sex-specific national incidences of gastric cancer by the corresponding proportions of tumor location. We studied 171 721 cases of gastric cancer from the Gastric Cancer Registry of Japan.

Results Over 15 years, the proportion of tumours in the upper third of the stomach increased in men but did not change much in women. The proportion of tumours in the middle third of the stomach increased among both men and women while the proportion of tumours in the lower third of the stomach decreased among both men and women. The incidence of tumours in the upper third of the stomach showed an increasing trend among elderly men and women but not among young ones. The incidence of tumours in the lower third of the stomach decreased significantly among men and women of most age groups.

Conclusions The present study added evidence of disparate trends in the incidence of gastric cancer by tumour location. The separate epidemiological features may indicate different aetiologies as well as changes in the degree of influence of these aetiologies.

Keywords Adenocarcinoma, cardia, Japan, adult, age factors, aged, human, incidence, male, female, registries, risk, regression analysis, gastric cancer, tumour location, proportion, incidence


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