Interaction of 1970–2010 breast cancer in-situ (brca, DCIS) rates with invasive breast cancer (brcainv) and mortality (brcamor): Comparative analysis of two regions with different screening mammography and therapy guidelines (ScreenMam).

e13069Background: To correlate age-standardized rates [ASRs] of DCIS, BrCaINV and BrCaMOR, separately for ages 50. British Columbia [BC] is known for earlier introduction, tighter adherence to, and more uniformity of ScreenMam than the Atlantic Provinces [AP]. Methods: Annual age-specific rates [ASRs] of DCIS, BrCaINV, and BrCaMOR were obtained for 17 five-year age groups (years 0-4 to 85+) in BC and AP, and averaged over 5-year1970-1974 to 2005-2009 periods [Lustrum], separately for ages 50. BrCaINV and BrCaMOR rates were expressed in percentages, relative to 1970-74 average. Data were obtained from Canada Public Health Agency and Canada Ca Registry database at Statistics Canada. Results: See Tables. Conclusions: DCIS: Rates are substantially increased since 1970s in both regions. For ages >50, rate stabilization is seen after 2000s, particularly in BC where the rate decrease is seen after 2005. BrCaINV: In both regions, rates for ages 50, rates are initia...