This is the second report from an Australian-first project, combining data from BreastScreen Australia, the National Cervical Screening Program, the National Bowel Cancer Screening Program, the Australian Cancer Database, the National Death Index, and the National HPV (human papillomavirus) Vaccination Program Register.
While the first report (AIHW 2018a) presented primary cancer outcomes for the target age groups for all three cancer screening programs, as well as examining screening behaviour across the three cancer screening programs, this report focuses on breast cancer outcomes and screening behaviour that are relevant to BreastScreen Australia.
Building on breast cancer outcomes for women in the BreastScreen Australia target age group of 50–69, these results also include age groups eligible to attend, but outside the target age group (note that the current target age group of 50–74 was not applicable to this project). Additionally, these results include outcomes using different correction factors for lead-time bias and screening selection bias that may be more appropriate for these Australian data. Screening behaviour analyses focus on key areas identified to be of particular interest and value to BreastScreen Australia.
The following analyses compare survival outcomes of breast cancers detected through BreastScreen Australia with breast cancers diagnosed in women who had never screened through BreastScreen Australia. For the years of data included, women aged 50–69 were targeted for screening, but were eligible to screen when aged 40–49 or 70 or over.