Abstract
Follicular lymphoma (fl) is the most common indolent lymphoma and the 2nd most common non-Hodgkin lymphoma, accounting for 10%-20% of all lymphomas in the Western world. Epidemiologic and geographic trends of fl in Canada have not been investigated. Our study's objective was to analyze incidence and mortality rates and the geographic distribution of fl patients in Canada for 1992-2010. Demographic and geographic patient data for fl cases were obtained using the Canadian Cancer Registry, the Registre québécois du cancer, and the Canadian Vital Statistics database. Incidence and mortality rates and 95% confidence intervals were calculated per year and per geographic area. Rates were plotted using linear regression models to assess trends over time. Overall data were mapped using Microsoft Excel mapping software (Redmond, WA, U.S.A.) to identify case clusters across Canada. Approximately 22,625 patients were diagnosed with fl during 1992-2010. The age-standardized incidence rate of this malignancy in Canada was 38.3 cases per million individuals per year. Geographic analysis demonstrated that a number of Maritime provinces and Manitoba had the highest incidence rates, and that the provinces of Nova Scotia and Quebec had the highest mortality rates in the nation. Regional data demonstrated clustering of fl within cities or regions with high herbicide use, primary mining, and a strong manufacturing presence. Our study provides a comprehensive overview of the fl burden and its geographic distribution in Canada. Regional clustering of this disease in concentrated industrial zones strongly suggests that multiple environmental factors might play a crucial role in the development of this lymphoma.
Highlights
Non-Hodgkin lymphomas are the 5th most commonly diagnosed cancers in Canadian adults[1]
Geographic analysis demonstrated that a number of Maritime provinces and Manitoba had the highest incidence rates, and that the provinces of Nova Scotia and Quebec had the highest mortality rates in the nation
Regional clustering of this disease in concentrated industrial zones strongly suggests that multiple environmental factors might play a crucial role in the development of this lymphoma
Summary
Non-Hodgkin lymphomas (nhls) are the 5th most commonly diagnosed cancers in Canadian adults[1]. In Canada, nhl accounts for nearly 90% of all lymphomas and for about 4% of all cancers in both sexes. There are more than 30 nhl subtypes, with follicular lymphoma (fl) being the most common form of indolent nhl and the 2nd most common form of nhl overall, accounting for approximately 20%–30% of all nhl cases[3]. Follicular lymphoma represents 10%–20% of all lymphomas in the Western world[4]. Follicular lymphoma (fl) is the most common indolent lymphoma and the 2nd most common non-. Hodgkin lymphoma, accounting for 10% –20% of all lymphomas in the Western world. Our study’s objective was to analyze incidence and mortality rates and the geographic distribution of fl patients in Canada for 1992–2010
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