STXBP5L and small cell lung carcinoma: It is described above that circ-STXBP5L participates in the carcinogenesis of SCLC as an onco-circRNA by sponging miR-224-3p and miR-512-3p and regulating a subset of target genes, including Akts, NFκB and Pik3ca (Zhang et al., 2020).