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Combining a CDK4/6 inhibitor and fulvestrant improves overall survival consistently among patients with hormone receptor–positive, HER2-negative advanced or metastatic breast cancer, according to a U.S. Food and Drug Administration (FDA) analysis. The agency reported the findings in Lancet Oncology.
Human epidermal growth factor receptor 2 proteins are involved in normal cellular growth and are found on the surface of all breast cells. Approximately 20% of breast cancers are HER2 positive, meaning they have high levels of HER2 protein, and those cancers typically grow and metastasize more quickly than other types of breast cancer.