Targeting of the HER2/HER3 signaling axis overcomes ligand-mediated resistance to trastuzumab in HER2-positive breast cancer.

ABSTRACT: HER2-targeted therapy, especially the anti-HER2 antibody trastuzumab, is standard for HER2-positive breast cancer; however, its efficacy is limited in a subpopulation of patients. HER3 ligand (heregulin)-dependent HER2-HER3 interactions play a critical role in the evasion of apoptosis and are therefore a target for oncotherapy to treat HER2-positive breast cancer. The anti-HER2 antibody pertuzumab and anti-HER3 antibody patritumab both target this heregulin-HER3-HER2 complex in different ways. This study examined the anticancer efficacy of dual HER2 and HER3 blockade in trastuzumab-resistant HER2-positive breast cancer. HER2-positive SKBR3 or BT474 cells overexpressing heregulin (SKBR3-HRG, BT474-HRG) were used to evaluate the efficacy of trastuzumab, pertuzumab, and patritumab in vitro by

SUBMITTER: Watanabe S 

PROVIDER: S-EPMC6434202 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature