© 2005-2012 American Society of Clinical Oncology (ASCO). All rights reserved worldwide.
Tumor marker tests may help plan and monitor treatment and guide prognosis. However, not every tumor marker is appropriate for every stage of breast cancer. The tumor markers that ASCO recommends have been shown in clinical trials to be useful for predicting response to treatment and/or finding the best treatment for people with breast cancer. Use this guide to discuss tumor marker tests and results with your doctor.