As shown in Fig. 2A, compared with normal tissues, COL1A2 was significantly upregulated in 12 cancer types (i.e. BRCA, CHOL, COAD, ESCA, HNSC, KIRC, LIHC, LUAD, LUSC, READ, STAD, and THCA), but downregulated in 3 cancer types (i.e. KICH, KIRP, and UCEC). Here, COL1A2 is linked to cancer.