<b>Real-World</b>Clinical Outcomes in Biological Subgroups of Breast Cancer in the Hospital District of Southwest Finland

This retrospective, registry-based study assessed the clinical outcomes of different breast cancer subgroups in 6,977 adult, female patients with breast cancer diagnosed in Southwest Finland during 2005-2018. Results demonstrated significant variation in the survival between subgroups in both early breast cancer and metastatic breast cancer, as well as differences between unselected patients representing the standard of care and randomized clinical trials. Although, according to the global comparison of survival trends, the net survival of patients with breast cancer in Finland is generally high, there is great variation between subgroups. These real-life breast cancer data provide tools to further evaluate medical need in different breast cancer subgroups.