EPX and neoplasm: Furthermore, the peptide cluster assigned to the lineage Bacteroidetes/Bacteroides and associated with TIL-negative tumor samples correlated positively with 286 host peptides, enriched in 6 protein functions (including eosinophil peroxidase and intelectin), and negatively with 271 host peptides, enriched in other 10 protein functions (including type II keratin, catalase, and ceruloplasmin).