KLF4 and non-small cell lung carcinoma: Thus, to explore the role of KLF4 in NSCLC, we transfected A549 and H1299 cells, respectively, with empty pcDNA3.1, pcDNA3.1-KLF4-full length (FL), and pcDNA3.1-KLF4 (FL) along with miR-34a-5p mimic.