The circRNA dedicator of cytokinesis 1 (circ_DOCK1, also called hsa_circ_0020397 according to the circRNA ID of circBase database) is downregulated in artery wall tissues and vascular smooth muscle cells of intracranial aneurysm patients, and it promotes vascular smooth muscle cell proliferation (Wang et al., 2019; Yin and Liu, 2021). The gene discussed is DOCK1; the disease is Dilatation of the cerebral artery.