the present invention relates to a system for predicting prognosis and benefits from adjuvant chemotherapy for patients with stage ii and iii gastric cancer, and an algorithm that can predict prognosis and responsiveness to chemotherapy using quantitative analysis results of mrna expression levels of a prognosis or a marker gene group related to responsiveness to chemotherapy and a reference gene group in advanced gastric cancer is developed and can be used as supplementary information to determine a method for the treatment of a patient with gastric cancer.
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