Geographic patterns and trends in the incidence of thyroid cancer in Norway 1970-1986

Norway has a special geographic distribution of thyroid cancer. There are very high incidence rates in the most northern part and an average Scandinavian level in the south. The incidence began to decline in the 1980s after increasing for a long time. The decline affects females more than males and...

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Bibliographic Details
Published in:	Cancer detection and prevention Vol. 14; no. 6; p. 625
Main Authors:	Glattre, E, Akslen, L A, Thoresen, S O, Haldoren, T
Format:	Journal Article
Language:	English
Published:	England 1990
Subjects:	Adenocarcinoma - epidemiology Adult Aged Carcinoma, Papillary - epidemiology Cohort Studies Female Humans Incidence Male Middle Aged Neoplasm Staging Norway - epidemiology Risk Factors Thyroid Neoplasms - epidemiology Thyroid Neoplasms - etiology Thyroid Neoplasms - pathology Norway
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Summary:	Norway has a special geographic distribution of thyroid cancer. There are very high incidence rates in the most northern part and an average Scandinavian level in the south. The incidence began to decline in the 1980s after increasing for a long time. The decline affects females more than males and is mainly seen in the oldest age groups and in mid- and north Norway. The decline is in papillary carcinomas and stage 1 and has occurred in primary trade communities more than the others. Cohort analysis demonstrates a secular trend in females, a continuous risk shift from older to younger age groups as the cohorts become younger--which explains the current bimodular age-specific incidence curve. Etiologic aspects are discussed.
ISSN:	0361-090X