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Anatumomab mafenatox (ABR-214936) is a 73 KDa recombinant protein to recognize the tumor-associated antigen 5T4, which is widely expressing in malignancy. Anatumomab mafenatox is between a modified form of SEA and a murine Fab. The main side effects of Anatumomab mafenatox are reported to include fever, low blood pressure, pain, nausea and drowsiness[1].

[1] Shaw DM, et al. A phase II study of a 5T4 oncofoetal antigen tumour-targeted superantigen (ABR-214936) therapy in patients with advanced renal cell carcinoma. Br J Cancer. 2007 Feb 26;96(4):567-74. DOI:10.1038/sj.bjc.6603567