Transient transfection of si-NC, si-UBE2D2, oe-NC, and oe-UBE2D2 was into A549 cells to figure out the action of circ-UBE2D2 in the progression of NSCLC, and the successful transfection was via PCR (Figure 2(a)). Here, UBE2D2 is linked to non-small cell lung carcinoma.