End of offer period

End of offer period

25 March 2011, London, UK, and Cambridge, MA: Antisoma plc (LSE: ASM; USOTC: ATSMY) today provides an update, further to the statement made in on 8 February 2011 that steps had been initiated to find a transaction that maximises shareholder value.

Since that time, and as announced on 9 March, steps have been taken substantially to reduce staff numbers and operating costs to conserve cash resources. This has included a number of changes to the board.

Whilst the Directors are still progressing options to exploit the Company's underlying intellectual property, this will not involve committing to further significant investment in these biopharmaceutical programmes. In addition, the Directors continue to consider where the cash resources of the Company should best be invested for the benefit of shareholders. At the current time, no transactions which might result in any offer for the issued share capital of the Company remain under consideration and none are now envisaged.

The Board, therefore, confirms that the Company is no longer deemed to be in an 'offer period' for the purposes of the City Code on Takeovers and Mergers.

Enquiries:

Antisoma plc

+44 (0)20 3249 2100

Grahame Cook, Chairman