Correction: Biodegradable reduce expenditure bioreactor for augmented sonodynamic therapy via regulating tumor hypoxia and inducing pro‑death autophagy

Correction : Journal of Nanobiotechnology (2021) 19: 418 https://doi.org/10.1186/s12951-021-01166-y

Following publication of the original article [1], the authors identified an error in Fig. 6d.

Fig. 6

In vivo antitumor efcacy enabled by HHBP. a The tumor growth curves following diferent treatments (n = 3). ***P < 0.001. b Body weight of 4T1 tumor-bearing mice after diferent treatments (n = 3). c Representative images of the excised tumors after diferent treatments. (I) PBS, (II) HMME@HMONs-PEG, (III) HHBP, (IV) HMME@HMONs-PEG + US, and (V) HHBP + US. d Histological and immunohistochemical analyses of H&E, Ki67 and TUNEL assays for the excised tumor tissues after diferent treatments. Scale bar = 200 μm. e Representative immunofuorescence images of LC3 in the tumor tissues of mice after diferent treatments. Scale bar = 100 μm

During the process of using integration images tool to permutate and combine multiple data images into one image, the authors inadvertently copied the image from one layer to another and selected the wrong layer, resulting in group IV and V in Ki-67 staining images being cropped from the same image. The correct figure is provided below and the original article has been updated.