Retraction of "MicroRNA-23 regulates the growth, metastasis and chemosensitivity of human gastric cancer cells by targeting MAP3K9", by Deping Li, Juan Wang, Yuanjian Hui, Yan Yang, Xingchun Peng, Shengbao Li, Chuantao Sun. JBUON 2020;25(5):2315-2321; PMID: 33277851 Following the publication of the above article, readers drew to our attention that part of the data was unreliable: Figures of this article appeared in other articles (by totally different authors). The authors were requested to provide the raw data and were also asked for an explanation to account for these concerns, but the Editorial Office did not receive any reply. Given above, we decided to retract this article. Authors were informed of the retraction. We thank the readers for bringing this matter to our attention. We apologize for any inconvenience it may cause.