Previous studies of laryngeal and lung cancers have reported that let-7a can regulate the expression of KRAS, and that menin is involved in let-7a miRNA processing (Johnson et al. 2005, Long et al. 2009, He et al. 2010, Oh et al. 2010, Guan et al. 2011, Wang et al. 2013, Gurung et al. 2014). This evidence concerns the gene MEN1 and lung carcinoma.