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New guidance of HER2 testing

ASCO and CAP recently issued a joint, updated guideline aimed at improving the accuracy and reporting of human epidermal growth factor receptor 2 (HER2) testing in patients with invasive breast cancer.

The guideline update is based on a systematic review of medical research literature, providing oncologists and pathologists with detailed recommendations for how to test for HER2 overexpression, interpret the results, and recommend HER2-targeted therapies. The guideline, originally issued in 2007, is being published in ASCO’s Journal of Clinical Oncology (JCO) and the CAP’s Archives of Pathology & Laboratory Medicine. The joint guideline was prepared by an ASCO/CAP Update Committee consisting of experts in breast cancer and cancer biomarkers.Approximately 15% of all newly diagnosed breast cancers are HER2-positive, meaning that the tumors have extra copies of the HER2 gene and/or high

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