Estrogen and Progesterone Receptor Testing in Breast Cancer: ASCO/CAP Guideline Update

This is a clinical practice guideline for patients with breast cancer. The guideline examines the use of estrogen and progesterone receptor testing to determine which patients are best suited for endocrine therapy. Specific topics addressed include the prognostic value of estrogen and progesterone receptors, testing of ductal carcinoma in situ, and other potential assays for determining patient suitability for endocrine therapy.