**Figure 7.** **Levels of hsa_circ_0002874, miR1273f, and MDM2 in samples of NSCLC tissues and paired non-cancerous matched tissues.** (**A**–**C**) Levels of hsa_circ_0002874, miR1273f, and MDM2 were measured using qPCR compared with GAPDH/U6 and calculated using the equation 2-ΔΔCT. (**D**–**F**) Schematic representation of the expression level of hsa_circ_0002874, miR1273f, and MDM2 in 20 NSCLC tissues compared with paired non-cancerous matched tissues. (**G**) Correlation analysis between hsa_circ_0002874 expression and miR1273f expression via Spearman Rank test. (**H**) Correlation analysis between hsa_circ_0002874 expression and MDM2 expression via Spearman Rank test. (**I**) Correlation analysis between miR1273f expression and MDM2 expression via Spearman Rank test. (**J**) Analysis of MDM2 expression in different pathological types of NSCLC via Oncomine database. (**K**) Heat map of the relative expression of hsa_circ_0002874, miR1273f, and MDM2 in 20 patients.