HOTAIR and lung cancer: LncRNAs have been found to have diverse biological functions, some of which are involved in various tumorigenic processes.7 A number of dysregulated lncRNAs have also been demonstrated to be potential diagnostic or prognostic biomarkers for lung cancer, such as metastasis associated in lung adenocarcinoma transcript 1 (MALAT1)8 and HOX antisense intergenic RNA (HOTAIR)9 which are overexpressed in NSCLC and recognized as onco‐lncRNAs.