CD4 and neoplasm: We investigated the correlation between VDR expression and the abundance of immune cells, including B cells, CD8+ T cells, CD4+ T cells, macrophages, neutrophils, and dendritic cells in different TCGA tumors using TIMER 2.0. We found a negative correlation between VDR expression and the abundance of B cells, CD8+ T cells, macrophages, and tumor purity; however, there was a positive correlation between the expression of VDR and the infiltration of CD4+ T cells, neutrophils, and dendritic cells.