KRAS and non-small cell lung carcinoma: More recently, in NSCLC Kirsten rat sarcoma viral oncogene homolog (KRAS) wild-type subpopulations, a novel and significant correlation was observed among promoter and in intragenic exon 3 cytosine-guanine dinucleotide island (CpG-I) methylation and the transcription levels of KEAP1, NFE2L2 and many ARE genes [46,47].