Fig. 3

Quantitative real-time PCR was used to confirm the microarray results in A549/DDP and A549/MDR lines. The expression levels of upregulated DEGs (a) and downregulated DEGs (b) were determined by qRT-PCR in A549/DDP and A549/MDR cell lines. GAPDH was used as an internal control. ^*p < 0.05, ^**p < 0.01, ^***p < 0.001 versus A549/DDP