To clarify miR-30b-5p’s downstream mechanism in the pathogenesis of asthma, the StarBase database (http://starbase.sysu.edu.cn/) was utilized for predicting the downstream target genes of miR-30b-5p, and it was discovered that there were 2 complementary binding sites between PTEN mRNA 3ʹ-UTR and miR-30b-5p (Figure 3a). This evidence concerns the gene PTEN and asthma.