GSEA based on all DEGs without limitation of p value and log2FC was performed, and the results showed that cytokine–cytokine receptor interaction, ECM‐receptor interaction, nuclear factor‐kappa B (NF‐κB) signaling pathway, TNF signaling pathway, and T2DM were positively correlated with the T2DM sample (Figure 3a), while the citrate cycle (TCA cycle), nucleotide excision repair, pyruvate metabolism, ubiquitin‐mediated proteolysis, valine, leucine, and isoleucine degradation were positively correlated with the Con sample (Figure 3b). Here, TNF is linked to type 2 diabetes mellitus.