Metastatic breast cancer biomarker study

The purpose of this study is to learn more about how metastatic breast cancer changes over time and how those changes may affect which treatments work best. By studying tumor tissue and blood samples, researchers hope to identify specific features, called biomarkers, that can help match each person to the treatment that's most likely to help them. This information may also help doctors better understand why some cancers respond to treatment and others do not, so that future patients can receive more personalized care.