CD8A and neoplasm: Analyses of the local (gut lamina propria), circulating, and tumor immune profiles associated FMT success with enhanced infiltration of CD8+ T cells and antigen-presenting cells, similar to findings in pre-clinical models (Baruch et al., 2021b; Davar et al., 2021; Matson et al., 2018; Routy et al., 2018b; Sivan et al., 2015; Fig. 1).