Subjects: Biomarkers, Tumor/Biomarkers, Tumor/Biomarkers, Tumor/*metabolism ; Gastrointestinal Neoplasms/Gastrointestinal Neoplasms/Gastrointestinal Neoplasms/*diagnosis ; Gastrointestinal Neoplasms/Gastrointestinal Neoplasms/Gastrointestinal Neoplasms/*surgery
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