For example, Croce and his group found that levels of miRNA (miR)-29 family, including miR-29a, miR-29b, and miR-29c, were inversely correlated with the expression levels of DNMT3A and DNMT3B in non-small cell lung cancer (NSCLC) tissues. This evidence concerns the gene DNMT3A and non-small cell lung carcinoma.