What to Know: ASCO's Guideline on Tumor Markers for Breast Cancer

To help doctors give their patients the best possible care, the American Society of Clinical Oncology (ASCO) asks its medical experts to develop recommendations for specific areas of cancer care. ASCO developed a clinical practice guideline about tumor markers for breast cancer. This guide for patients is based on ASCO's recommendations.

Key Messages:

• A tumor marker is a substance produced by the tumor or a person's body in response to cancer.
• Tumor markers can help your doctor plan and monitor treatment.
• This patient guide recommends the use of different tumor markers for different types of breast cancer; talk with your doctor about which tests are most appropriate for you.