MIR155HG and lung adenocarcinoma: We initially investigated TCGA datasets of lung adenocarcinoma (LUAD) and GEO dataset (GSE40791), which revealed that MIR155HG expression in LUAD was markedly higher than that in adjacent normal tissues (Figs. 1A and S1A), which was confirmed in a small LUAD cohort with 30 paired samples (Fig. 1B).