CD8A and neoplasm: Importantly, FMT responding patients exhibited higher levels of activated CD8+ T cells with higher cytolytic functions than FMT non‐responders and the proportion of immunosuppressive myeloid‐derived suppressor cells (MDSC) was lower in the FMT responding patients,127 Thus, the gut microbiota seems to be involved in determining response or resistance to ICBs, potentially through mechanisms which alter the tumor immune microenvironment.