Expression of Concern

p re ss io n o f C o n ce rn The Editors have received information that three articles [1–3] on the subject of HER2 amplified breast cancer, previously published by this Journal, contained errors in the citation of methods and interpretation of primary data cited by the authors. Although the general conclusion of the papers remains unchanged, the Editors of The Oncologist bring these inaccuracies to the attention of readers and suggest that this information should be taken into account inmaking reference to these three articles [1–3] and in judging their content.This statement has been reviewed by the senior authors, who endorse this Expression of Concern.