targeting as a therapeutic approach for treatment of metastatic breast cancer.

During tumorigenesis and metastasis, integrins regulate localization and activity of proteolytic enzymes that remodel the extracellular matrix. Previous studies have demonstrated blocking of αβ to effectively inhibit proliferation, angiogenesis, and the survival of various cancer cell types. However, little is known about the functional role of the integrin subunit alpha-V gene () in metastatic breast cancer. In this study, knockdown was used to identify the molecular mechanism by which promotes tumorigenesis, metastasis, proliferation, invasion, and cellular self-renewal. The effectiveness of an ITGAV antagonist, cilengitide, for breast cancer treatment was investigated . Analysis of publicly available data demonstrated that overexpression of was associated with poor relapse free survival of breast cancer patients. Silencing of inhibited cell proliferation, invasion, and self-renewal of breast cancer cell lines by altering expression of and . The use of cilengitide significantly reduced lung metastasis in a metastatic breast cancer animal model. In conclusion, overexpression of contributes to breast cancer metastasis through upregulation of . Targeting is a potential treatment for metastatic breast cancer as well as primary breast tumors with high expression. expression levels may be useful predictors of patient treatment and outcome responses.