In Chinese population, the results of the study performed by Zhang et al. [115] showed that nine genes (APC, CDH13, KLK10, DLEC1, RASSF1A, EFEMP1, SFRP1, RARβ and p16(INK4A)) had a significantly higher frequency of methylation in NSCLC as compared with normal tissues, while several others (RUNX3, hMLH1, DAPK, BRCA1, p14(ARF), MGMT, NORE1A, FHIT, CMTM3, LSAMP and OPCML) showed relatively low sensitivity or specificity. This evidence concerns the gene MGMT and non-small cell lung carcinoma.