Retraction of

• The circular RNA hsa-circ-0072309 plays anti-tumour roles by sponging miR-100 through the deactivation of PI3K/AKT and mTOR pathways in the renal carcinoma cell lines.

  Chen T, Shao S, Li W, Liu Y, Cao Y. Chen T, et al. Artif Cells Nanomed Biotechnol. 2019 Dec;47(1):3638-3648. doi: 10.1080/21691401.2019.1657873. Artif Cells Nanomed Biotechnol. 2019. Retraction in: Artif Cells Nanomed Biotechnol. 2021 Dec;49(1):674. doi: 10.1080/21691401.2021.2003042. PMID: 31456425 Retracted.