==== Front PLoS One PLoS One plos PLOS ONE 1932-6203 Public Library of Science San Francisco, CA USA 10.1371/journal.pone.0288268 PONE-D-23-19896 Expression of Concern Expression of Concern: Prognostic Significance of Neutrophil-to-Lymphocyte Ratio in Colorectal Liver Metastasis: A Systematic Review and Meta-Analysis The PLOS ONE Editors 3 7 2023 2023 3 7 2023 18 7 e0288268© 2023 The PLOS ONE Editors 2023 The PLOS ONE Editors https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Prognostic Significance of Neutrophil-to-Lymphocyte Ratio in Colorectal Liver Metastasis: A Systematic Review and Meta-Analysis ==== Body pmcAfter this article was published, similarities were noted between this article [1] and submissions by other research groups which call into question the validity and provenance of the reported results. In response to queries about these concerns, the first author provided the underlying data in S1 File. The authors commented on aspects of how data were collected and analyzed for this study, but overall their responses did not fully resolve the concerns. The PLOS ONE Editors issue this Expression of Concern to notify readers of the unresolved concerns discussed above, and to provide the data received from the authors. Supporting information S1 File The underlying data used for the analysis in this article [1]. (ZIP) Click here for additional data file. ==== Refs Reference 1 Tang H , Li B , Zhang A , Lu W , Xiang C , Dong J (2016) Prognostic Significance of Neutrophil-to-Lymphocyte Ratio in Colorectal Liver Metastasis: A Systematic Review and Meta-Analysis. PLoS ONE 11 (7 ): e0159447. doi: 10.1371/journal.pone.0159447 27427969