Reports have demonstrated Axl upregulation in tumors such as prostate [114,115,116,117], ovarian [118,119,120,121,122,123], NSCLC [124,125], OSCC [126,127,128], osteosarcoma [129,130,131], AML [132], schwannoma [112], glioma [16,133,134,135], and thyroid cancer cell lines [106,136]. Here, AXL is linked to central nervous system cancer.