title: A novel mouse monoclonal antibody targeting ErbB2 suppresses breast cancer growth.
abstract: Overexpression of ErbB2 in breast cancer is associated with increased recurrence and worse prognosis. Accumulating evidences suggest that molecular targeted therapy is a promising anticancer strategy. In this study, we produced a novel anti-ErbB2 monoclonal antibody, 6G10, that recognized an epitope distinct from the trastuzumab binding site. 6G10 induced aggregation of BT474 breast cancer cells and inhibited proliferation of various breast cancer cell lines including BT474. A growth inhibition assay showed that 6G10 had EC(50) values comparable to trastuzumab, indicating that the drugs have a similar level of potency. Furthermore, intraperitoneal administration of 6G10 completely inhibited the growth of xenografted tumors derived from BT474 and SK-BR-3 cells. These data suggested that 6G10 has great therapeutic potential and could be administered to patients alternatively, or synergistically, with trastuzumab.
authors.affiliation: Division of Oncology, Institute of Medical Science, University of Tokyo, Shirokanedai 4-6-1, Minato-ku, Tokyo 108-8639, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Kawa
authors.forename: Hirohisa
authors.initials: H
authors.lastname: Matsushita
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Ohbayashi
authors.forename: Kentaro
authors.initials: K
authors.lastname: Semba
authors.forename: Tadashi
authors.initials: T
authors.lastname: Yamamoto
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology* / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000628:therapy*; D045744:Cell Line, Tumor; D005260:Female; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D016688:Mice, Inbred NOD; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000276:immunology; D023041:Xenograft Model Antitumor Assays
chemical_list: D000911:Antibodies, Monoclonal; D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human