摘要目的:比较食管鳞状细胞癌行根治性放疗不同放疗剂量对生存的影响，并探讨预后影响因素。方法:回顾性分析2002-2016年中国10所医疗中心2 344例接受根治性放化疗/放疗的食管鳞状细胞癌患者临床资料，经1∶2倾向性评分配比(PSM)，根据放疗剂量分为低剂量组(EQD 2Gy<60 Gy)303例，高剂量组(EQD 2Gy≥60 Gy)606例。 Kaplan- Meier法生存分析， Cox模型多因素预后分析。 结果:中位随访时间为59.6个月。经PSM配比后，低剂量组和高剂量组的1、3、5年总生存率分别为66.5%、34.7%、27.2%和72.9%、41.7%、34.7%( P＝0.018)，无进展生存率分别为52.2%、27.2%、23.1%和58.3%、38.1%、33.9%( P＝0.001)。单因素结果显示颈段/胸上段食管癌、临床分期早、无区域淋巴结转移、病变长度短、采用IMRT技术、接受同步化疗、EQD 2Gy≥60 Gy为总生存获益因素(均 P<0.05)。多因素结果显示肿瘤部位、有无区域淋巴结转移、是否接受同步化疗以及EQD 2Gy是影响总生存的重要因素(均 P<0.05)。 结论:局部晚期食管鳞状细胞癌患者应用三维适形或调强放疗EQD 2Gy≥60 Gy时生存获益。

abstractsObjective:To evaluate the effect of definitive radiotherapy with different doses on overall survival (OS) and identify the prognostic factors of patients with non-metastatic esophageal squamous cell carcinoma (ESCC).Methods:Clinical data of 2 344 ESCC patients treated with definitive radiotherapy (RT) alone or chemoradiotherapy from 2002 to 2016 in 10 hospitals were collected and analyzed retrospectively. After the propensity score matching (PSM)(1 to 2 ratio), all patients were divided into the low-dose group (equivalent dose in 2 Gy fractions, EQD 2Gy<60 Gy; n=303) and high-dose group (EQD 2Gy≥60 Gy; n=606) based on the dose of radiation. Survival analysis was conducted by Kaplan- Meier method. Multivariate prognostic analysis was performed by Cox′s regression model. Results:The median follow-up time was 59.6 months. After the PSM, the 1-, 3- and 5-year overall survival (OS) rate was 66.5%, 34.7%, 27.2% in the low-dose group, 72.9%, 41.7% and 34.7% in the high-dose group, respectively ( P=0.018). The 1-, 3-and 5-year progression-free survival rate was 52.2%, 27.2%, 23.1% in the low-dose group, 58.3%, 38.1% and 33.9% in the high-dose group, respectively ( P=0.001). The outcomes of univariate analysis indicated that cervical/upper esophagus location, early (stage Ⅱ) AJCC clinical stage, node negative status, tumor length ≤5 cm, receiving intensity-modulated radiation therapy (IMRT), receiving concurrent chemotherapy and EQD 2Gy≥60 Gy were closely associated with better OS (all P<0.05). Multivariable analysis demonstrated that tumor location, regional lymph node metastasis, concurrent chemotherapy and EQD 2Gy were the independent prognostic factors for OS (all P<0.05). Conclusion:Three-dimensional conformal or IMRT with EQD 2Gy≥60 Gy yields favorable survival outcomes for patients with locally advanced ESCC.