CDKN1A and non-small cell lung carcinoma: Next, using real-time RT-PCR and western blot analysis, we compared the expression of seven radiation-altered genes (SESN2, FN1, TRAF4, CDKN1A, COX-2, DDB2 and FDXR) in two NSCLC cells with different radiosensitivity, A549 and NCI-H460 (Fig. 5B and Fig. 6).