NDRG1 and neoplasm: lncRNA NDRG1-OT1 may work as a miRNA sponge to particularly inhibit a tumor suppressor miRNA, miR-875-3p, and promote cancer cell proliferation, though functional targets at the downstream of the HIF1α/NDRG1-OT1/miR-875-3p axis have not been established so far (72).