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The angiogenesis‐associated genes and pathways are downregulated in SCLC tissues. A, Top 20 of 142 significantly downregulated signal pathways in SCLC tissue were showed, angiogenesis‐associated pathways are highlighted in red. B, In comparison to control tissue, the expression of angiogenesis inhibitor target genes was globally low expressed, indicating an inhibitory or nonactivated status of SCLC intratumor microenvironment
