SCFAs enhance polarization effects set by the cytokine milieus present at the time of T‐cell priming and differentiation [253]Fecal transplants from PD‐1 responder patients decrease tumor burden and size in combination with anti‐PD1 therapy [255]Faecalibacterium promotes cytotoxic CD8+ T‐cell recruitment to tumors [255]SCFAs decrease proinflammatory cytokine secretion by macrophages and dendritic cells [253]. Here, PDCD1 is linked to neoplasm.