We evaluated the relationship between STING expression and the infiltration of 28 types of immune cells in 17 human malignant tumor types based on the TCGA data set and showed that the STING pan-cancer expression level is positively correlated with the infiltration of almost all types of immune cells, including both antitumor immune cells, such as DCs and CTLs, and immune-suppressing cells, such as myeloid-derived suppressor cells (MDSCs) and Tregs [107]. The gene discussed is STING1; the disease is cancer.