miR-200b has been demonstrated to be an important tumor suppressor.39, 40 To identify the lncRNA involved in miR-200b-mediated chemoresistance in LUAD, we applied the RT2 lncRNA PCR system and found that MALAT1 had an influence on the expression level of miR-200b, presenting a negative expression correlation with miR-200b. This evidence concerns the gene MALAT1 and neoplasm.