Interestingly, Liu and colleagues reported that E6 and E7 oncoproteins enhance the expression of HIF-1α, as well as of ZEB-1, SNAIL-1, SLUG, and TWIST-1 in non-small cell lung cancer (NSCLC) cells, thus promoting the EMT process [37]. This evidence concerns the gene SNAI2 and non-small cell lung carcinoma.