Dose-escalated radiotherapy improved survival for esophageal cancer patients with a clinical complete response after standard-dose radiotherapy with concurrent chemotherapy
Authors Zhang W, Luo YJ, Wang XL, Han GH, Wang P, Yuan W, Dai SB
Received 27 December 2017
Accepted for publication 8 May 2018
Published 14 August 2018 Volume 2018:10 Pages 2675—2682
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Nakshatri
Wei Zhang,1,* Yijun Luo,2,* Xiaoli Wang,2 Gaohua Han,1 Peng Wang,1 Wei Yuan,3 Sheng-Bin Dai1
1Department of Oncology, Taizhou People’s Hospital, Taizhou, Jiangsu, People’s Republic of China; 2Department of Oncology, The People’s Hospital of Jiangxi Province, Nanchang, Jiangxi, People’s Republic of China; 3Department of Cardiology, Taizhou People’s Hospital, Taizhou, Jiangsu, People’s Republic of China
*These authors contributed equally to this work
Purpose: For esophageal cancer patients with a clinical complete response (cCR) after standard-dose radiotherapy with concurrent chemotherapy, data on the survival outcomes and recurrence patterns remain scarce. To evaluate the impact of dose escalation on overall survival for this subset of patients, we carried out the current investigation.
Materials and methods: Medical records of 80 esophageal cancer patients with a cCR after standard-dose radiotherapy with concurrent chemotherapy at our center from 2010 to 2014 were allocated into the standard-dose group (50.4 Gy, observation group) or the radiation dose-escalation group (59.4 Gy, control group). In this cohort study, we compared the outcomes between the 2 groups.
Results: There were no differences in patient characteristics between the 2 groups. The median recurrence-free survival and overall survival times for all patients were 38 and 54 months, respectively. Patients in the control group had significantly better 5-year recurrence-free survival rate (12% vs 0%, p=0.019) and 5-year overall survival rate (42.8% vs 21.0%, p=0.028) than the observation group. Additionally, local control rate was significantly higher in the control group (p=0.04), and ~60% of treatment failures were local failures even for patients achieving cCR after chemoradiotherapy. There were no significant differences in treatment-related toxicities between the groups.
Conclusion: The results of the current study suggest that for esophageal cancer patients with a cCR after standard-dose radiotherapy with concurrent chemotherapy, those with dose-escalated radiotherapy showed significantly better local control, recurrence-free survival, and overall survival than patients receiving 50.4 Gy radiotherapy.
Keywords: esophageal squamous cell carcinoma, radiotherapy, survival outcome, recurrence patterns
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