It has also been found that the guide strand miR-9-5p [69] can promote the proliferation, migration, and invasion of hepatocellular carcinoma cells by targeting ESR1, while the passenger strand miR-9-3p [70] has been proved to inhibit the proliferation and apoptosis of glioma cells through forkhead box G1 (FOXG1). Here, FOXG1 is linked to central nervous system cancer.