6 MiRNAs are critical components of competing endogenous RNA network in cells. 7 Via binding to complementary sites on mRNA 3ʹUTR, miRNAs promote mRNA degradation or inhibit mRNA translation to repress gene expression. 8 Dysregulation of miRNAs results in abnormal expression of target genes and is associated with cancer development. 9 Hundreds of cancer-associated miRNAs have been reported in colorectal cancer. 10,11 For example, miR-193a-3p, which is downregulated in BRAF-mutated colorectal cancers, inhibits colorectal cancer cell proliferation. 12 MiR-4449 is highly expressed in serum from patients with multiple myeloma compared with samples from healthy volunteers. 13 However, the precise function of miR-4449 in colorectal cancer is not known.