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However, a substantial gap remains in the understanding of the primary drivers of metabolic reprogramming and alterations in early\u2010stage LUAD. Using an unbiased, large\u2010scale metabolomics analysis of 2,531 plasma and serum samples from three independent clinical centers, we identified significant perturbations in purine metabolism that characterized reprogrammed metabolism in early\u2010stage LUAD. Additionally, hypoxanthine (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) and xanthine (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05) were identified as two typical early risk indicators, with odd ratios (ORs) more than 2.8 and 1.45, respectively. Guanosine monophosphate synthetase (GMPS) was identified as a pivotal factor in the early development and malignant progression of LUAD. Progression of LUAD was significantly attenuated by <jats:italic>GMPS<\/jats:italic> knockdown and markedly exacerbated by its overexpression. Further data indicated that GMPS primarily contributed to the reprogrammed metabolic phenotypes of LUAD through its enzymatic activity and subsequent production of purine nucleotides, based on the relative abundance of the labeled isotope metabolites. Collectively, dysregulated purine metabolism emerged as a key characteristic of early\u2010stage LUAD, and targeting GMPS activity may offer a promising therapeutic potential for LUAD treatment. \u00a9 2025 The Pathological Society of Great Britain and Ireland.<\/jats:p>","DOI":"10.1002\/path.6442","type":"journal-article","created":{"date-parts":[[2025,6,20]],"date-time":"2025-06-20T09:19:28Z","timestamp":1750411168000},"page":"465-480","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Circulating metabolomics reveals guanosine monophosphate synthetase (<scp>GMPS<\/scp>) as a novel therapeutic target in lung adenocarcinoma"],"prefix":"10.1002","volume":"266","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6960-1205","authenticated-orcid":false,"given":"Mengjie","family":"Yu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Natural Medicines China Pharmaceutical University  Nanjing PR 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