For example, miR‐424‐5p/circ‐LARP4 (Zhang et al., 2017), miR‐126/circ‐ANKS1B (Zeng, et al., 2018; Zhang et al., 2013), miR‐192‐5p/circ‐SMARCA5 (Gu et al., 2018; Yu et al., 2018), and miR‐106b/circ‐MYLK (Lee et al., 2018; Zhong et al., 2017) were identified as the promising prognostic biomarkers of gastric cancer, breast cancer, hepatocellular carcinoma, and bladder cancer, respectively. This evidence concerns the gene SMARCA5 and hepatocellular carcinoma.