HR-positive/HER2-negative is the most common subtype of breast cancer. It accounts for about 70% of breast cancers. This is nearly four times the HER2-positive rate, which accounts for about 15%-20% of cases. The triple-negative breast cancer rate accounts for about 15% of cases as well.
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Cite this: Pavani Chalasani, Stefania Morganti. Skill Checkup: A 56-Year-Old Woman With a History of Breast Cancer and Pain in Her Ribs and Spine - Medscape - Jan 23, 2023.
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