COL1A1 and neoplasm: In our study, the data from qRT-PCR, WB, and dual luciferase reporter assay solidly confirmed that miR-29b-3p directly targeted COL1A1 and COL5A1 3′‐UTR and thus caused degradation of type I and V collagens, which could explain the downregulation of miR-29b-3p in clinical tumor tissues.