Objective: In this study, we investigated the effects of radiotherapy 60 Gy in the setting of concurrent chemo-radiotherapy for treating patients with Stages II -III esophageal cancer. Methods: A total of 126 patients treated with 5-fluorouracilbased concurrent chemo-radiotherapy between January 1998 and February 2008 were retrospectively reviewed. Among these patients, 49 received a total radiation dose of ,60 Gy (standard-dose group), while 77 received a total radiation dose of 60 Gy (high-dose group). The median doses in the standard-and high-dose groups were 54 Gy (range, 45-59.4 Gy) and 63 Gy (range, 60 -81 Gy), respectively. Results: The high-dose group showed significantly improved locoregional control (2-year locoregional control rate, 69 versus 32%, P , 0.01) and progression-free survival (2-year progression-free survival, 47 versus 20%, P Âź 0.01) than the standard-dose group. Median overall survival in the high-and the standard-dose groups was 28 and 18 months, respectively (P Âź 0.26). In multivariate analysis, 60 Gy or higher radiotherapy was a significant prognostic factor for improved locoregional control, progression-free survival and overall survival. No significant differences were found in frequencies of late radiation pneumonitis, post-treatment esophageal stricture or treatment-related mortality between the two groups. Conclusions: High-dose radiotherapy of 60 Gy or higher with concurrent chemotherapy improved locoregional control and progression-free survival without a significant increase of in treatment-related toxicity in patients with Stages II -III esophageal cancer. Our study could provide the basis for future randomized clinical trials.