Table 1. The criteria for screening cases and files in the TCGA databases.

Options	Choice	Options	Choice
Primary site	Bronchus and lung	Data category	Gene expression quantification
Program	TCGA	Experimental strategy	RNA-seq
Project	TCGA-LUAD	Workflow type	*HTSeq-FPKM
Disease	Adenomas and adenocarcinomas

*, HTSeq is a Python software used for gene Count expression analysis. TCGA, The Cancer Genome Atlas; LUAD, lung adenocarcinoma; RNA-seq, RNA sequencing; FPKM, Fragments per Kilobase of transcript per Million mapped reads.