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Circular RNAsplay important modulators in cisplatin (DDP) resistant non-small cell lung cancer (NSCLC). Herein, the role and mechanism of circ_0030411 in DDP-resistant NSCLC was explored. Circ_0030411, miR-495-3p, CCND1, PCNA, Bax, E-cadherin, and ki-67 expression were examined byqRT-PCR, western blot and IHC. DDP resistance, cell proliferation, apoptosis, and motility were assessed usingCCK, EdU flow cytometry, and transwell. Xenograft tumour model was established to explore the role of circ_0030411 in DDP-resistant NSCLC. Interaction between miR-495-3p and circ_0030411 or CCND1 wasverified  via  luciferase reporterand RIP. Circ_0030411 and CCND1 were increased in DDP-resistant NSCLC tissues and cells, andmiR-495-3p level was decreased. Circ_0030411 knockdown hindered cell growth, migration, invasion, in DDP-resistant NSCLC cells, and improved DDP sensitivityof NSCLC  in vivo . Mechanistically, circ_0030411 acted as a sponge of miR-495-3p to affect CCND1expression. Circ_0030411 facilitated DDP resistance by regulating the miR-495-3p/CCND1 axis, highlighting a promising target for NSCLC patients.

Circ_0030411 aggravates cisplatin-resistance in non-small cell lung cancer by serving as a miR-495-3p sponge to enhance CCND1 expression