Roche (SIX: RO, ROG; OTCQX: RHHBY) announced today the approval of the CE Mark for the VENTANA® HER2 (4B5) Rabbit Monoclonal Primary Antibody RxDx* to identify metastatic breast cancer patients with low HER2 expression for whom ENHERTU® (trastuzumab deruxtecan) may be considered as a targeted treatment. The test, which is branded PATHWAY in the United States, received US Food and Drug Administration (FDA) approval in October 2022. ENHERTU is a specifically engineered HER2-directed antibody drug conjugate (ADC) being jointly developed and commercialised by Daiichi Sankyo and AstraZeneca.
HER2 is a receptor protein that helps cancer cells grow quickly. To determine a patient’s HER2 status, pathologists evaluate, or score, the level of HER2 protein expressed in breast cancer tissue samples. If a patient’s tumour expresses high levels of HER2, the patient is identified as HER2-positive and may be considered for HER2-targeted treatment. However, half of all patients with metastatic breast cancer express low levels of HER2 which historically classified them as HER2-negative.
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