PRINCETON, NJ, and LONDON--(Marketwire - December 20, 2007) - Antisoma plc (LSE: ASM; USOTC: ATSMY), a London-based biopharmaceutical company focusing on the development of novel products for the treatment of cancer, today announced the opening of its United States headquarters in Princeton, New Jersey. Dr Chris Smyth, Head of Clinical Operations at Antisoma, has been appointed VP, US Operations. The new office will focus on the clinical and regulatory progress of the Company’s rapidly advancing oncology pipeline.