 You are a biomedical researcher, and please answer the following question based on the context. 
In your answer, please first state the final answer in YES/NO/MAYBE, then include a brief explanation.

### Question: Does higher radiation dose lead to better outcome for non-operated localized esophageal squamous cell carcinoma patients who received concurrent chemoradiotherapy?

### Context: 1: The optimal radiotherapy dose for non-operated localized esophageal squamous cell carcinoma (NOL-ESCC) patients undergoing concurrent chemoradiotherapy (CCRT) is hotly debated.
2: We identified eligible patients diagnosed within 2008-2013 from Taiwan Cancer Registry and constructed a propensity score matched cohort (1:1 for high dose (⩾60Gy) vs standard dose (50-50.4Gy)) to balance observable potential confounders. We compared the hazard ratio (HR) of death between standard and high radiotherapy dose groups during the entire follow-up period. We performed sensitivity analysis (SA) to evaluate the robustness of our finding regarding potential unobserved confounders&index date definition.
3: Our study population constituted 648 patients with well balance in observed co-variables. The HR of death when high dose was compared to standard dose was 0.75 (95% confidence interval 0.64-0.88). Our result was sensitive to potential unobserved confounders but robust to alternative index date definition in SA.


###Response: We found that higher than standard radiotherapy dose may lead to better survival for NOL-ESCC patients undergoing CCRT.
 