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). Here, KRT80 is linked to neoplasm.