( LONDON and FLORENCE Italy - 8 March 2...)Antisoma plc (UK) - Second lung cancer trial adds to positive data,on AS1404,Health

LONDON and FLORENCE, Italy - 8 March 2007 - Cancer drug developer Antisoma plc (LSE: ASM, US OTC: ATSMY) today announces positive initial findings from its second, confirmatory phase II trial of AS1404 in non-small cell lung cancer.

This 30-patient trial tested an 1800 mg/m2 dose of AS1404 in combination with carboplatin and paclitaxel chemotherapy. Investigators reported a response rate of 50%. A further 43% of patients showed disease stabilisation, while only 7% had progressive disease as their best response. Addition of AS1404 to chemotherapy was well-tolerated despite the use of a dose 50% higher than that used in previous combination studies.

The data are included in a presentation made today at the Tumor Microenvironment meeting in Florence, Italy, by Antisoma's Chief Medical Officer, Dr Gary Acton. Further data from the trial, including time to progression and survival findings, are expected during the second half of this year.

An earlier randomised controlled phase II study in lung cancer showed a 5-month increase in median survival when 1200 mg/m2 AS1404 was added to carboplatin and paclitaxel. Initial data from other controlled phase II trials in ovarian and prostate cancers have shown increased response rates with addition of AS1404 to standard chemotherapy.

Dr Mark McKeage of the University of Auckland, New Zealand, a key investigator in both AS1404 lung cancer studies, said: "The high response rate and favourable tolerability profile in this study support earlier data suggesting that AS1404 has real potential as a novel therapy for lung cancer."

Glyn Edwards, CEO of Antisoma, added: "AS1404 now draws support from four phase II studies across three different cancers, an excellent position to be in as we prepare the drug for phase III trials."

Enquiries: Daniel Elger, Director of Communications +44 (0)7909 915 068 Antisoma plc

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