CCND1 and lung cancer: Cir‐ITCH can adhere to miR‐7 and miR‐214, thereby aggravating the inhibitory effect of ITCH on the downstream Wnt pathway.9 Hsa_circRNA_103809 adheres to miR‐4302, thereby increasing the proliferation and migration of lung cancer cells produced by MYC.10 Hsa_circ_0013958 was identified as a sponge for miR‐134, which promotes the progression of lung cancer by upregulating cyclin D1.11 At present, the role of circ‐IGF1R in lung cancer is still unclear, and its specific mechanisms are yet to be elucidated.