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Improved prognostic biomarkers could aid treatment planning across surgical, neoadjuvant, and adjuvant settings. We evaluated a novel liquid-biopsy approach integrated with esophagogastroduodenoscopy (EGD) by analyzing gastric fluid DNA (gfDNA) from a large cohort (n=1056) to assess its diagnostic utility and prognostic value in gastric cancer. In this exploratory study, gfDNA concentration was measured in patients with normal gastric mucosa, peptic diseases, preneoplastic conditions, or cancer. Variables included sex, gastric fluid pH, proton-pump inhibitor use, tumor subtype, stage, and outcomes. gfDNA levels were significantly higher in gastric cancer than in all comparison groups (mean 26.86 ng\/\u00b5L; 95% CI 20.05\u201333.79; p=3.61 \u00d7 10e\n                    <jats:sup>-12<\/jats:sup>\n                    ) and as compared to non-malignant controls (mean 10.77 ng\/\u00b5L; 95% CI 9.23\u201312.33; p=9.55 \u00d7 10e\n                    <jats:sup>-13<\/jats:sup>\n                    ) and preneoplastic states (mean 10.10 ng\/\u00b5L; 95% CI 7.59\u201312.60; p=1.10 \u00d7 10e\n                    <jats:sup>-5<\/jats:sup>\n                    ). Advanced tumors (T3) exhibited higher gfDNA than earlier stages (T2 or below; mean 25.66 vs 15.12 ng\/\u00b5L; p=5.97 \u00d7 10e\n                    <jats:sup>-4<\/jats:sup>\n                    ). In a subset of gastric cancer patients, gfDNA &gt;1.28 ng\/\u00b5L associated with longer progression-free survival (p=0.009) and correlated with increased tumor-infiltrating immune cells (p=0.001); this association remained after adjusting for stage (p=0.014). Elevated gfDNA supports gastric cancer presence in the general human population and may inform disease management when combined with tissue biopsies. Importantly, gfDNA shows prognostic potential in established gastric cancer, where higher gfDNA content may paradoxically relate to better outcomes, potentially linked to immune-cell infiltration. These findings warrant further validation and integration with complementary diagnostic modalities to enhance accuracy and clinical utility.\n                  <\/jats:p>","DOI":"10.7554\/elife.107103","type":"journal-article","created":{"date-parts":[[2025,8,26]],"date-time":"2025-08-26T15:30:39Z","timestamp":1756222239000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.107103","source":"Crossref","is-referenced-by-count":0,"title":["Endoscopic liquid biopsies of gastric fluid in a large human patient cohort reveal DNA content as a candidate tumor biomarker in gastric cancer"],"prefix":"10.7554","volume":"14","author":[{"given":"Francine C","family":"Cadon\u00e1","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03025ga79","id-type":"ROR","asserted-by":"publisher"}],"name":"Laboratory of Medical Genomics, A. C. 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