Prognostic values of the gross volume of metastatic lymph nodes in patients with esophageal squamous cell carcinoma treated with definitive concurrent chemoradiotherapy.

We found highly significant differences in OS among the three groups (P < 0.001; Figure 3A ), with corresponding 5-year OS rates of 17.0% for high-risk group, 26.3% for intermediate-risk group, and 54.0% for low-risk group.

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