Saliva,conversely, demonstrated a substantial increase in fucosylation inPD, aligning with findings in other diseases like lung adenocarcinoma,suggesting its potential as a source of discriminatory glycan signatures.Site-specific glycopeptide analyses revealed distinct glycoproteinexpression profiles across biofluids, with notable alterations inproteins like ATP11B, PIGR, and AZGP1, highlighting their roles inPD-related processes. Here, PIGR is linked to lung adenocarcinoma.