actinium Ac 225-FPI-1434

A radioconjugate consisting of veligrotug, a humanized monoclonal antibody directed against insulin-like growth factor-1 receptor (IGF-1R) linked, via a bifunctional chelate, to the alpha-emitting radioisotope actinium Ac 225, with potential antineoplastic activity. Upon administration of actinium Ac 225-FPI-1434, the veligrotug moiety targets and binds to IGF-1R expressed on tumor cells. Upon binding, the radioisotope moiety delivers a cytotoxic dose of alpha radiation to IGF-1R-expressing tumor cells. Activation of IGF-1R, a receptor tyrosine kinase of the insulin receptor superfamily overexpressed by various cancer cell types, stimulates cell proliferation, promotes angiogenesis, enables oncogenic transformation, and suppresses apoptosis.