SUMF2 and chronic obstructive pulmonary disease: In addition, the Kruskal-Wallis test also validated the expression levels of DEGs common to T2DM and COPD in different immune cells, and although SUMF2 was expressed at a lower level in immune cells, by combining the RT-qPCR data of Figure 7E T2DM combined with COPD patients, it was found that compared with the healthy individuals, the expression level of SUMF2 alone was statistically different (Figure 9G).