Editor's Note: EGFR Activation and Signaling in Cancer Cells Are Enhanced by the Membrane-Bound Metalloprotease MT4-MMP.

The editors are publishing this note to alert readers to concerns about this article (1). In Fig. 2, the actin loading control bands for cyclin D1 and cyclin D2 are identical-the authors clarified that the Western blots for cyclin D1 and cyclin D2 were performed on the same samples, however, this was not indicated in the figure legend. Additionally, in Fig. 6C, the p-EGFR bands in MDA-MB-231 cells showing stimulation by TGFa treatment are identical to the p-EGFR bands showing stimulation by EGF treatment. In the original submission of this manuscript, a correct version of this figure was used to show both TGFa and EGF could stimulate p-EGFR in control vector (CTR)- and MT4-MMP-expressing (MT4) MDA-MB-231 cells, but these panels were mistakenly duplicated in the revised and final versions of the manuscript.