Vantictumab (Anti-FZD) is a monoclonal antibody targeting the Wnt signaling pathway with potential antineoplastic activity. Vantictumab binds to certain receptors in the Wnt signaling pathway thereby preventing the activation of the Wnt signaling pathway. This results in an inhibition of cancer stem cell (CSC) activity and a subsequent inhibition of cancer cell proliferation. MW: 145.5 KD.