The results of the Western blot assay showed that in the two kinds of lung cancer cells, the expression of PLAG1 in the let-7 inhibitor group was higher than that in the control group, while the expression of PLAG1 in the let-7 mimic group was decreased (p < 0.001, Figures 7C, D), which proved that PLAG1 was regulated by let-7. Here, PLAG1 is linked to lung cancer.