Breast Cancer Incidence Among Young Women Of Urban China (Shanghai) And In Canada: Implications For Prevention.

1576 Background: Objective of this study: to evaluate, in Urban China and Canada, the long-term BrCa incidence trends, with emphasis on rates among young women age u003c50. Shanghai, one of the largest regions of Urban China, enjoyed since the late 1970’s rapid rates of westernization, i.e. confluence of western lifestyles, urbanization and industrialization. While a good association between the westernization and BrCa incidence has been reported in past studies, BrCa age-specific incidence analyses comparing urban China to western regions such as Canada, are not available. Methods: Data were received from Shanghai Municipal Centre for Disease Control and Prevention and from the Public Health Agency of Canada based on the Canadian Cancer Registry database at Statistics Canada. For each region, 5-year age specific BrCa incidence rates [ASIRs] in 5 year cohorts starting at age 35 were estimated and expressed as percent difference between years 1973-79 [baseline, 100%] and the last five years 2000-2004. ASIRs we...