ISSN:
1573-7225
Keywords:
Brain neoplasms
;
epidemiology
;
histology
;
incidence
;
medulloblastoma
;
New Zealand
;
occupation
;
race
;
secular trends
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
We used New Zealand data on occurrence of different types of brain cancer to investigate: (i) a possible secular increase which has been seen worldwide and has generated considerable debate; (ii) possibly higher rates among Maori; and (iii) possibly higher risks related to social class and occupation. Data from the NZ Cancer Registry on the 5,684 brain cancers diagnosed among NZ residents from 1948–88 were used to study the pattern of occurrence by gender, age, race, calendar year, social class, occupation, and histology. Agestandardized brain-cancer incidence rates per 100,000 more than doubled over the 41-year period (from 2.9 to 6.9 in males and from 2.1 to 5.1 in females). A strong trend of increasing incidence with increasing social class is seen in males (P trend=0.01). Among Maori, the proportion of all brain cancer that is medulloblastoma is four times that among non-Maori, and the proportion of all brain cancers that lack histologic confirmation is about 40 percent higher. Elevated risks are seen among: dairy farmers (odds ratio [OR]=3.4, 95 percent confidence interval [CI]=1.9–6.0); sheep handlers (OR=2.7, CI=1.4–5.3); livestock workers (OR=3.8, CI=1.7–8.4); and farm managers (OR=3.2, CI=1.4–7.2); as well as among electrical engineers (OR=8.2, CI=20–34.7); electricians (OR=4.6, CI=1.7–12.2); and other electrical workers. Brain cancer rates in NZ have increased steadily since 1948, but this increase has leveled off in the most recent five-year period. Although brain cancer rates are likely to be underestimated among the Maori, an excess of medulloblastoma is evident in this group.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00052428
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