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American Journal of Epidemiology Advance Access originally published online on March 8, 2006
American Journal of Epidemiology 2006 164(2):170-175; doi:10.1093/aje/kwj118
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American Journal of Epidemiology Copyright © 2006 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.

Original Contribution

Socioeconomic Status and Childhood Solid Tumor and Lymphoma Incidence in Canada

Gabor Mezei1, Marilyn J. Borugian2, John J. Spinelli2, Russell Wilkins3, Zenaida Abanto2 and Mary L. McBride2

1 Environment Division, Electric Power Research Institute, Palo Alto, CA
2 Cancer Control Research Program, British Columbia Cancer Agency, Vancouver, British Columbia, Canada
3 Health Analysis and Measurement Group, Statistics Canada, Ottawa, Ontario, Canada

Correspondence to Dr. Gabor Mezei, Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94304 (e-mail: gmezei{at}epri.com).

The authors examined the relation between neighborhood income, as a measure of socioeconomic status, and childhood cancer. Incident cases of childhood solid tumor and lymphoma in 1985–2001 were identified from provincial cancer registries in Canada. Residential postal codes at the time of diagnosis were used to assign cases to census neighborhoods. Person-years at risk were determined from quintiles of population by neighborhood income, sex, and 5-year age group, constructed using census population data. Poisson regression was used to calculate incidence rate ratios across neighborhood income quintiles. Compared with the incidence rate in the richest income quintile, moderately lower rate ratios of 0.73 (95% confidence interval: 0.63, 0.86) and 0.84 (95% confidence interval: 0.69, 1.04) were observed, respectively, for carcinomas and renal tumors in the poorest income quintile. No association was found for other types of cancer. Although a potential relation between socioeconomic status and childhood cancer cannot be excluded, the overall pattern seems compatible with random variation.

adolescent; Canada; child; incidence; infant; lymphoma; neoplasms; social class

Abbreviations: ICCC, International Classification of Childhood Cancer


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