Risk-tailored starting age of breast cancer screening based on women's reproductive profile: A nationwide cohort study
Menée en Suède auprès de 5 099 172 participantes nées en 1931 (période de suivi : 1958-2015) et menée à l'aide des données du registre national des cancers, cette étude met en évidence l'intérêt des facteurs reproductifs (parité et âge à la première naissance) pour identifier les femmes pouvant bénéficier précocement d'un programme de dépistage du cancer du sein
Background : Although reproductive history is recognised to affect the risk of breast cancer, current breast cancer screening guidelines do not consider risk differences by this important factor. As there is a need for an earlier screening in women at increased risk of breast cancer, we provided evidence-based risk-adapted starting age of screening based on different reproductive profiles.
Material and methods : We conducted a nationwide cohort study including 5,099,172 Swedish women born after 1931. Records of study participants in Swedish Cancer Registry, Multi-generation Register, Cause of Death Register, and national censuses (follow-up, 1958–2015) have been linked. We used 10-year cumulative risk of breast cancer curves to determine the age at which women with different reproductive factors attained the risk level at which breast screening is usually recommended.
Results : The 10-year cumulative risk of breast cancer at age 40, 45 and 50 years in the general population, at which current screening guidelines recommend screening was calculated. We found that women with various reproductive factors (defined by parity and age at first birth) obtained this level of risk at different ages. The difference was between nine years later and three years earlier.
Conclusions : This study provides the age at which women with particular reproductive profile could start risk-adapted breast cancer screening. This supplies novel information for clinicians and women about when to start breast cancer screening and is an important step towards a personalised screening.
European Journal of Cancer , résumé, 2019