title: Target-based therapies in breast cancer: current status and future perspectives.
abstract: Identification of molecular alterations in key proteins involved in breast cancer cell proliferation and survival resulted in the development of a new treatment strategy with target-based agents. The anti-ErbB-2 monoclonal antibody (mAb) trastuzumab and the dual epidermal growth factor receptor/ErbB-2 tyrosine kinase inhibitor lapatinib are effective in patients with breast cancer that overexpresses ErbB-2. The anti-vascular endothelial growth factor-A mAb bevacizumab is approved in combination with taxanes for treatment of unselected patients with metastatic breast cancer. In addition, preclinical data suggest that signaling inhibitors can prevent or overcome resistance to endocrine therapy in estrogen receptor positive (ER+) breast cancer. However, the majority of signaling inhibitors explored in breast cancer patients has shown little activity, at least when used as monotherapy; and the results of clinical trials in ER+ breast cancer of combinations of signaling inhibitors and endocrine therapies are rather disappointing. Negative findings are likely due to mechanisms of intrinsic or acquired resistance to target-based agents. Breast carcinoma is a complex and heterogeneous disease and several different molecular alterations are involved in its pathogenesis and progression. The redundancy of oncogenic pathways activated in cancer cells, the heterogeneity of the mechanisms of resistance, and the plasticity of tumor cells that are capable to adapt to different growth conditions, significantly hamper the efficacy of each signaling inhibitor in breast cancer. Therefore, a comprehensive approach that takes into account the complexity of the disease is definitely required to improve the efficacy of target-based therapy in breast cancer.
authors.affiliation: Cell Biology and Biotherapy Unit, INT-Fondazione Pascale, 80131 Naples, Italy. nicnorm@yahoo.com
authors.forename: Nicola
authors.initials: N
authors.lastname: Normanno
authors.forename: Alessandro
authors.initials: A
authors.lastname: Morabito
authors.forename: Antonella
authors.initials: A
authors.lastname: De Luca
authors.forename: Maria Carmela
authors.initials: MC
authors.lastname: Piccirillo
authors.forename: Marianna
authors.initials: M
authors.lastname: Gallo
authors.forename: Monica R
authors.initials: MR
authors.lastname: Maiello
authors.forename: Francesco
authors.initials: F
authors.lastname: Perrone
mesh_terms: D020533:Angiogenesis Inhibitors / Q000627:therapeutic use; D000818:Animals; D000911:Antibodies, Monoclonal / Q000627:therapeutic use; D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000188:drug therapy*; D016503:Drug Delivery Systems / Q000379:methods* / Q000639:trends*; D005260:Female; D006801:Humans; D008954:Models, Biological; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000276:immunology; D015398:Signal Transduction / Q000187:drug effects
chemical_list: D020533:Angiogenesis Inhibitors; D000911:Antibodies, Monoclonal; D000970:Antineoplastic Agents; D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human