FOXP3 and neoplasm: The presence of Stenotrophomonas, Acinetobacter, and Haemophilus in GC tissues showed a positive correlation with BDCA2+ pDC. The pDCs were responsible for the generation of CD4+ CD25+ Foxp3+ Treg cells, leading to functional incompetence and immunosuppression, thereby facilitating immune evasion by tumor cells.