ADARB2 and glioblastoma: CircNT5E (circ 5′‐nucleotidase ecto [NT5E]) derived from NT5E is formed by binding of adenosine deaminase RNA‐specific B2 (ADARB2) binding to the flanking site of the circRNA intron, and its high expression often causes the proliferation and distant metastasis of GBM cells in GBM.