Total Voting Rights

Total voting rights

01 April 2011, London, UK, and Cambridge, MA: Antisoma plc (LSE: ASM; USOTC: ATSMY) notifies the market that the Company's issued share capital consists of 636,272,858 ordinary shares with voting rights. Antisoma does not hold any ordinary shares in Treasury.

Therefore, the total number of voting rights in Antisoma is 636,272,858.

The above figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Antisoma under the FSA's Disclosure and Transparency Rules.

Enquiries:

Eric Dodd

Antisoma plc

+44 (0)20 3249 2100

Background on Antisoma

Antisoma is a London Stock Exchange-listed biopharmaceutical company that develops novel products for the treatment of cancer. The Company has operations in the UK and the US. Please visit www.antisoma.comfor further information about Antisoma.