Overcoming resistance to HER2-targeted therapy with a novel HER2/CD3 bispecific antibody Academic Article uri icon


MeSH Major

  • Antineoplastic Agents
  • Breast Neoplasms
  • HSP70 Heat-Shock Proteins
  • HSP90 Heat-Shock Proteins
  • Receptor, ErbB-2


  • T-cell-based therapies have emerged as one of the most clinically effective ways to target solid and non-solid tumors. HER2 is responsible for the oncogenesis and treatment resistance of several human solid tumors. As a member of the HER family of tyrosine kinase receptors, its over-activity confers unfavorable clinical outcome. Targeted therapies directed at this receptor have achieved responses, although development of resistance is common. We explored a novel HER2/CD3 bispecific antibody (HER2-BsAb) platform that while preserving the anti-proliferative effects of trastuzumab, it recruits and activates non-specific circulating T-cells, promoting T cell tumor infiltration and ablating HER2(+) tumors, even when these are resistant to standard HER2-targeted therapies. Its in vitro tumor cytotoxicity, when expressed as EC50, correlated with the surface HER2 expression in a large panel of human tumor cell lines, irrespective of lineage or tumor type. HER2-BsAb-mediated cytotoxicity was relatively insensitive to PD-1/PD-L1 immune checkpoint inhibition. In four separate humanized mouse models of human breast cancer and ovarian cancer cell line xenografts, as well as human breast cancer and gastric cancer patient-derived xenografts (PDXs), HER2-BsAb was highly effective in promoting T cell infiltration and suppressing tumor growth when used in the presence of human peripheral blood mononuclear cells (PBMC) or activated T cells (ATC). The in vivo and in vitro antitumor properties of this BsAb support its further clinical development as a cancer immunotherapeutic.

publication date

  • March 4, 2017



  • Academic Article



  • eng

PubMed Central ID

  • PMC5384386

Digital Object Identifier (DOI)

  • 10.1080/2162402X.2016.1267891

PubMed ID

  • 28405494

Additional Document Info

start page

  • e1267891


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