Opinion|Videos|November 15, 2023
Necessary Tests After a Diagnosis of Breast Cancer
Author(s)Sara M. Tolaney, MD, MPH
Sara M. Tolaney, MD, MPH, states that all breast cancers should be tested for estrogen, progesterone, and HER2 receptors; HER2 testing involves an immunohistochemistry stain to quantify protein levels, with 3+ indicating HER2+ disease, 0 indicating HER2- disease, and 1-2+ levels needing additional FISH testing to clarify HER2 status.
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