Some previous studies on miRNAs and hub genes involved in CRC identified 10 hub genes, SLC26A3, CLCA1, CLCA4, GUCA2A, GUCA2B, MS4A12, KRT20, AQP8, MAOA, and ADH1A, four differentially expressed miRNAs, miR-423-5p, miR-552, miR-502-3p, and miR-490-5p [75], and a specific miRNA and its role in CRC by targeting specific hub genes [76,77,78,79]. The gene discussed is KRT20; the disease is colorectal carcinoma.