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Effect of COL4A1 expression levels on overall survival of glioma patients at all levels based on three different databases [(A-D) CGGA RNA-seq; (E-H) CGGA RNA-microarray; (I-L) TCGA RNA-seq]. COL4A1, collagen α-1 (IV) chain; RNA-seq, RNA sequencing; TCGA, The Cancer Genome Atlas; CGGA, Chinese Glioma Genome Atlas.
