Expression of Concern: Chitosan nanoparticle-delivered siRNA reduces CXCR4 expression and sensitizes breast cancer cells to cisplatin

Bioscience Reports has been made aware of potential issues surrounding the scientific validity of this paper and is hence issuing a permanent Expression of Concern to notify readers.Specifically, it was noted that the second and third Figure 1C CXCR4 bands are highly similar to the first two Figure 5B TLR-4 bands of the article Fang and Jiang, 2016 (DOI: 10.1042/BSR20160118). The authors provided raw data but concerns remain.As such, the article will remain published but with an associated Expression of Concern.