Retraction Note: Circular RNA circ-CPA4/ let-7 miRNA/PD-L1 axis regulates cell growth, stemness, drug resistance and immune evasion in non-small cell lung cancer (NSCLC)

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**Retraction Note: ** ***J Exp Clin Cancer Res *** 39, 149 (2020)

10.1186/s13046-020-01648-1.

The Editor-in-Chief has retracted this article. After publication, a number of image concerns were raised, specifically:

• Figure 3 L was found to overlap with 3 C of a now retracted article, published previously [1].
• Blots from Fig. 5A were found to overlap with Fig. 1C of another article under consideration at the same time [2], and an article published previously [3] despite describing different conditions.
• Figure 5 H was found to overlap with Fig. 2C of [4].
• Two panels describing different conditions were found to overlap within Fig. 6C.
• Multiple panels within Fig. 7A were found to overlap.
• Figure 7 A was found to overlap substantially with Fig. 3E of another article under consideration at the same time [5].
• Supplementary Figure S1D was found to overlap with Fig. 4G from [2].

The Editor has lost confidence in the data and conclusions of this article.

The authors have not responded to correspondence from the publisher regarding this retraction.