Retraction notice to “Downregulation of MicroRNA-147 Inhibits Cell Proliferation and Increases the Chemosensitivity of Gastric Cancer Cells to 5-Fluorouracil by Directly Targeting PTEN” [Oncology Research 26(6) (2018) 901–911]

Retraction statement: We repeated the experiment of flow cytometry analysis to detect the 5-FU-induced apoptosis of AGS and BGC-823 cells last year and submitted the erratum data of flow cytometry apoptosis. However, we found the BGC-823 cell line was contaminated by another cell line during routine identification of cell lines. The BGC-823 cell lines were donated by another researcher. Because the cells used in the experiment are no longer the original cell lines, it will greatly threaten the quality of papers published based on these cells. Based on the reasons of appeal, all the authors agree to apply to withdraw this article. We are deeply sorry for the trouble caused to Oncology Research and readers.