The expression levels of circ_COL1A2, circ_PTN, circ_VCAN, circ_PLOD2, circ_SMO, circ_CLIP2, circ_GLIS3, and circ_EPHB4 in glioblastoma (GBM) are significantly higher than those in normal tissues. The gene discussed is CLIP2; the disease is glioblastoma.