Combined FMT and PD-1 blockade stimulated mucosal-associated invariant T (MAIT) cells and CD56+CD8+ T cells in peripheral blood mononuclear cells (PBMCs) and upregulated expression of the human leucocyte antigen (HLA) class II genes CD74 and GZMK on CD8+ T cells at tumor sites [14]. The gene discussed is PDCD1; the disease is neoplasm.