UQCRC2 and gastric cancer: As shown in Figure 8, UQCRQ, NDUFB7 and UQCRC2 expression showed significantly negative Pearson correlation with relative content of tumour infiltrating CD4+ T cells and macrophage cells, implying the role of the 3 genes not only in gastric cancer cells, but also in tumour infiltrating immune cells and tumour microenvironment.