Correction to: British Journal of Cancer (2006) 96, 336–340. doi:10.1038/6603492

Owing to a publishing error, part of the intended Supplementary Material for this paper was omitted at the time of publication. The correct supplementary tables were published; however, a further document was omitted. We are now happy to include this document as part of the Supplementary Material online – please visit the British Journal of Cancer website (http://www.nature.com/bjc).