[Expression of Concern] Pifithrin‑μ is efficacious against non‑small cell lung cancer via inhibition of heat shock protein 70

. The authors have been contacted by the Editorial Office to offer an explanation for the concerns that have been identified in their 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. [Oncology Reports 37: 313‑322, 2017; DOI: 10.3892/or.2016.5286].