Expression of concern

The publisher of Nanomaterials and Energy is issuing an Expression of Concern for the following article:

Niu, Sen (2023), “Preparation of acid-sensitive polymeric oncology drug carriers and analysis of effectiveness”, Vol. 12, No. 4, pp. 139–148, https://doi.org/10.1680/jnaen.22.00031

This is to inform readers that concerns have been raised regarding the adherence to appropriate reporting standards for animal testing and that sufficient ethical approval has not been provided for this research and does not feature in the published text.

Despite numerous attempts to contact the author, the journal has received no response; the response of the author would be gratefully received.