Investigators: Anna Cohen (CI), Mireille Campbell, Bill Sun, George Zu, Christa Marjioribanks, Catherine Miles, Timothy Darmanin The objectives of this project are to estimate the “true” breast screening participation rate across public and private screening avenues in NSW, and to understand and compare the demographic profiles, screening patterns, interval cancer prevalence, and cancer mortality rates of women screened through BreastScreen NSW and outside BreastScreen NSW. To meet these objectives, data linkage to the 45 and Up Study will enable these objectives to be measured. The results of the project will be used to inform BreastScreen NSW strategy aimed at increasing the breast screening participation rate of women in NSW.