SMAD7 and colorectal carcinoma: MiR-21 (Jiao et al., 2017), miR-1269 (Bu et al., 2015), miR-4775 (Zhao et al., 2017), and miR-581 (Zhao et al., 2020) were uniquely up-regulated and negatively correlated with SMAD7 expression in metastatic CRC samples.