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. 2021 Jan 1;18(1):256–269. doi: 10.7150/ijms.48123

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Heatmap of expression (cancer/normal) ratios in the GSE39409 dataset. The top highly expressed genes in ampullary cancer tissues were identified by hierarchical clustering with Pearson's coefficient. Genes in the heatmap represent the top 10% of genes with the highest correlation coefficients in ampullary adenocarcinomas compared to periampullary adenocarcinomas. Genes listed on the right side include peroxisome proliferator-activated receptor alpha (PPARA) signaling and lipid metabolism-related ones.