Data from these databases indicated that PCSK9 mRNA expression had inter-tumor heterogeneity, with some tumors having very high levels of PCSK9 (BRCA, CESC, CHOL, COAD, ESCA, HNSC, LIHC, READ, SKCM, STAD, THCA, and UCEC). This evidence concerns the gene PCSK9 and neoplasm.