© 2005-2012 American Society of Clinical Oncology (ASCO). All rights reserved worldwide.
To help doctors give their patients the best possible care, the American Society of Clinical Oncology (ASCO) and the College of American Pathologists (CAP) developed evidence-based recommendations to improve the accuracy of testing for estrogen and progesterone receptors for breast cancer. This guide for patients is based on ASCO's and CAP's recommendations.
- Estrogen and progesterone receptors are found in breast cancer cells that depend on estrogen and related hormones to grow.
- All patients with invasive breast cancer or a breast cancer recurrence should have their tumors tested for estrogen and progesterone receptors.
- This testing should be performed by an accredited laboratory that follows specific testing procedures and handles the samples in a consistent way.