CD8A and neoplasm: As shown in Fig. 9d, the expression of MCAM in BLCA was associated with tumor purity (r = − 0.302), CD8 + T cells (r = 0.218), CD4 + T cells (r = 0.111), macrophages (r = 0.352), neutrophils (r = 0.183), and dendritic cells (r = 0.183).