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Ref Type | Journal Article | ||||||||||||
PMID | (25953157) | ||||||||||||
Authors | Bidard FC, Ng CK, Cottu P, Piscuoglio S, Escalup L, Sakr RA, Reyal F, Mariani P, Lim R, Wang L, Norton L, Servois V, Sigal B, Vincent-Salomon A, Weigelt B, Pierga JY, Reis-Filho JS | ||||||||||||
Title | Response to dual HER2 blockade in a patient with HER3-mutant metastatic breast cancer. | ||||||||||||
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Abstract Text | HER3 activating mutations have been shown in preclinical models to be oncogenic and ligand-independent, but to depend on kinase-active HER2.Whole-exome sequencing of the primary HER2-negative breast cancer and its HER2-negative synchronous liver metastasis from a 46-year-old female revealed the presence of an activating and clonal HER3 G284R mutation.HER2 dual blockade with trastuzumab and lapatinib as third-line therapy led to complete metabolic response in 2 weeks and confirmed radiological partial response after 8 weeks. Following the resection of the liver metastasis, the patient remains disease-free 40 weeks after initiation of the HER2 dual blockade therapy. Immunohistochemical analysis demonstrated a substantial reduction of phospho-rpS6 and phospho-AKT in the post-therapy biopsy of the liver metastasis.This is the first-in-man evidence that anti-HER2 therapies are likely effective in breast cancers harboring HER3 activating mutations. |
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