Therefore, we studied the association between SRSF9 and immune infiltrating cells in 33 cancer types from TIMER database, and the significant results given in Figure 8 presented that SRSF9 was notably correlated with tumor purity and six types of immune infiltrating cells, including CD8+ T cell, CD4+ T cell, B cell, neutrophil, dendritic cell, and macrophage, in KIRC, LGG, LIHC, LUSC, PCPG, PRAD, SKCM, THCA, and THYM. The gene discussed is CD4; the disease is neoplasm.