CD8A and neoplasm: Using the TIMER2.0 bioinformatics tool, we analyze metformin/OCT transporter genes (OCT1, OCT2, OCT3) and their correlation with 14 immune cell types (CD8+ T cells, CD4+ T cells, B cells, T cell follicular helper, T cell gamma delta, M0/M1/M2 macrophages, mast cells, neutrophils, dendritic cells, Natural Killer cells, T regulatory cell, monocytes) across 32 TCGA tumor types.