title: [Genetic alteration of gastrointestinal cancers: new tumor marker].
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics*; D005770:Gastrointestinal Neoplasms / Q000175:diagnosis / Q000235:genetics*; D017491:Genes, APC; D016163:Genes, DCC; D016158:Genes, p53; D011905:Genes, ras; D006801:Humans
chemical_list: D014408:Biomarkers, Tumor