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PF-06940434 is an investigational intravenously administered drug developed by Pfizer. It acts as a selective antagonist of integrin alpha-V/beta-8 (αvβ8), also known as CD51, and is being studied primarily for its potential antineoplastic activity in advanced or metastatic solid tumors. By blocking integrin αvβ8, PF-06940434 inhibits the release of active transforming growth factor beta 1 and 3 (TGFβ1 & TGFβ3) into the tumor microenvironment, which may reduce tumor progression by modulating TGF-beta signaling pathways involved in immune suppression and tumor growth.
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