Retraction of: British Journal of Cancer (2008) 99, 1493–1501; doi:10.1038/sj.bjc.6604727

After a thorough investigation, we have recently concluded that key results contributed by the first author cannot be reproduced. As the senior and corresponding author, I have therefore decided to retract this paper.

The co-author has been informed, and agrees with this decision. I emphasise that there is no doubt whatsoever about her contribution.

I sincerely apologise for the inconvenience this may have caused to readers of this journal.

Dr Ed Roos

Division of Cell Biology

The Netherlands Cancer Institute