OL Oncology Letters 1792-1074 1792-1082 D.A. Spandidos 10.3892/ol.2026.15565 OL-31-6-15565 Expression of Concern [Expression of Concern] Delphinidin induces cell cycle arrest and apoptosis in HER-2 positive breast cancer cell lines by regulating the NF-κB and MAPK signaling pathways WuAilin ZhuYanfeng HanBin PengJiayuan DengXiaomin ChenWei DuJingchang OuYu PengXiaoli YuXiaoping 062026 01042026 31 6 210 Copyright: © Wu et al. 2026 This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

Oncol Lett 22: 832, 2021; DOI: 10.3892/ol.2021.13093

Following the publication of the above paper, it has been drawn to the Editor's attention by a concerned reader that the western blots shown for Cyclin B1 in Fig. 2B were strikingly similar to the data shown for the c-Raf-1 blots in Fig. 4C; in addition, the blots shown for the PKCα and IKKβ experiments in Fig. 5A were also remarkably similar.

The authors have been contacted by the Editorial Office to offer an explanation for these apparent anomalies in the presentation of the data in this paper, and we are awaiting their response. Owing to the fact that the Editorial Office has been made aware of potential issues surrounding the scientific integrity of this paper, we are issuing an Expression of Concern to notify readers of these potential problems while the Editorial Office continues to investigate this matter further.