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The page below is a sample from the LabCE course Breast Cancer Predictive Markers. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Response Rates to Targeted Therapy

Research data has shown that tamoxifen therapy prolonged both disease-free periods and also overall survival rates in patients with estrogen receptor (ER)-positive breast tumors, but had little benefit for patients who had ER-negative tumors. In addition, patients who were ER-negative, but progesterone receptor (PR)-positive, also improved with tamoxifen therapy.