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An international comparison of cancer survival: Toronto, Ontario, and Detroit, Michigan, metropolitan areas.

K M Gorey, E J Holowary, G Fehringer, E Laukkanen, A Moskowitz, D J Webster and N L Richter

School of Social Work, University of Windsor, Ontario, Canada.

OBJECTIVES: This study examined whether socioeconomic status has a differential effect on the survival of adults diagnosed with cancer in Canada and the United States. METHODS: The Ontario Cancer Registry and the National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) program provided a total of 58,202 and 76,055 population-based primary malignant cancer cases for Toronto, Ontario, and Detroit, Mich, respectively. Socioeconomic data for each person's residence at time of diagnosis were taken from population censuses. RESULTS: In the US cohort, there was a significant association between socioeconomic status and survival for 12 of the 15 most common cancer sites; in the Canadian cohort, there was no such association for 12 of the 15 sites. Among residents of low-income areas, persons in Toronto experienced a survival advantage for 13 of 15 cancer sites at 1- and 5-year follow-up. No such between-country differentials were observed in the middle- or high-income groups. CONCLUSIONS: The consistent pattern of a survival advantage in Canada observed across various cancer sites and follow-up periods suggests that Canada's more equitable access to preventive and therapeutic health care services is responsible for the difference.

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