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Onartuzumab is a monoclonal antibody that blocks the binding of HGF to the MET receptor.

Onartuzumab (MetMAb) is a unique, humanized and affinity-matured monovalent (one-armed) monoclonal antibody against the MET receptor. Onartuzumab potently inhibits HGF binding and receptor phosphorylation and signaling. Onartuzumab has antibody-like pharmacokinetics and antitumor activity[1].

Onartuzumab is ineffective in improving clinical outcomes in (i) combination with current first-line chemotherapy in advanced nonsquamous cell NSCLC , (ii) combination with erlotinib in previously treated stage IIIB or IV NSCLC patients (Phase III) , and (iii) combination with platinum-doublet chemotherapy in advanced squamous cell NSCLC (Phase II) .

[1] Merchant M, et al. Monovalent antibody design and mechanism of action of onartuzumab, a MET antagonist with anti-tumor activity as a therapeutic agent. Proc Natl Acad Sci U S A. 2013 Aug 6;110(32):E2987-96. DOI:10.1073/pnas.1302725110
[2] Prell RA, et al. Placental and Fetal Effects of Onartuzumab, a Met/HGF Signaling Antagonist, When Administered to Pregnant Cynomolgus Monkeys. Toxicol Sci. 2018 Sep 1;165(1):186-197. DOI:10.1093/toxsci/kfy141