Queen Mary University London notified Nature and University College London that there is
reason to question the provenance of the data for Fig. 5b, d, e of this Letter (Fig. 5a, c data
are unaffected). Ongoing studies are investigating the reported effect of p110δ inhibition in
the pancreatic cancer mouse model. We therefore wish to withdraw these figure panels and
associated text from the published paper. This does not affect the overall conclusion of the
manuscript or any of the other experiments performed for this study as they repeat effects …