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Flowchart of the design of the current study. SMD, standardized mean difference; SROC, summarized receiver operating characteristic; TCGA, The Cancer Genome Atlas; GEO, Gene Expression Omnibus; LUSC, refers to lung squamous cell carcinoma; RT-qPCR, reverse transcription-quantitative polymerase chain reaction; GEPIA, Gene Expression Profiling Interactive Analysis; CASC9, cancer susceptibility candidate 9.
