MEDICAL SCIENCES Retraction for “Wnt-5a signaling restores tamoxifen sensitivity in estrogen receptor-negative breast cancer cells,” by Caroline E. Ford, Elin J. Ekström, and Tommy Andersson, which appeared in issue 10, March 10, 2009, of Proc Natl Acad Sci USA (106:3919–3924; first published February 23, 2009; 10.1073/pnas.0809516106).
The authors wish to note the following: “During efforts to extend this work, we re-examined the laboratory records for all figures and found that the Excel files on which Fig. 4C was based contained serious calculation errors; the first author of the paper takes full responsibility for these inaccuracies. Considering the importance of this figure for the conclusions drawn, the authors hereby retract the work. We apologize for any inconvenience this may have caused.”
Caroline E. Ford
Elin J. Ekström
Tommy Andersson