肿瘤局部相关因素对N0期食管癌IMRT预后影响

目的 探讨食管癌肿瘤局部相关因素对接受根治性放化疗N0期食管鳞癌患者GTV内复发的影响,并分析对10年长期生存的影响。方法 对河北医科大学第四医院2005-2010年收治的根治性放化疗临床N0期食管鳞癌患者374例进行回顾分析。284例累及野照射,90例择性淋巴结照射。69l例同期放化疗,38例序贯放化疗。Kaplan-Meier法生存分析,Cox模型多因素预后分析。结果全组患者出现GTV内复发143例(38.2%),GTV内复发者GTV最大横径(GTV-D)、GTV体积(GTV-V)和GTV-体积/长度(GTV-V/L)均显著长于GTV内未失败者(P=0.008、0.043、0.001)。ROC曲线分析结果显示GTV-D、GTV长度(GTV-L)、GTV-V和GTV-V/L判断GTV内复发的最佳诊断阈值分别为3.5cm、5.5cm、24.0cm³和4.6cm²(P=0.000、0.003、0.000、0.000),且其值较大者GTV内复发比率均大于其余组(P=0.000、0.002、0.001、0.000)。GTV-L和GTV-V/L为影响GTV内复发的因素(P=0.021、0.009)。全组3、5、10年生存率分别为42.9%、23.2%和7.9%,多因素分析结果显示年龄、T分期、联合化疗、GTV-D和GTV-V/L为影响生存的因素(P=0.027、0.000、0.018、0.009、0.034)。生存时间≥5年的主要死亡原因仍与肿瘤相关。结论 食管癌肿瘤局部相关因素对接受根治性放化疗临床N0食管鳞癌患者GTV内复发有显著影响,可作为GTV内复发的预测指标。GTV-D和GTV-V/L为显著影响患者10年生存的因素。

Effect of locoregional risk factors on long-term prognosis of patients with N0 stage esophageal cancer receiving intensity-modulated radiotherapy

Objective To evaluate the effect of locoregional risk factors of esophageal cancer on the recurrence of gross tumor volume (GTV) in patients with N0 esophageal squamous cell carcinoma after radical intensity-modulated radiotherapy (IMRT) and to evaluate its effect on the 10-year survival of patients. Methods Clinical data of 374 patients with clinical N0 esophageal squamous cell carcinoma who underwent radical IMRT in the Fourth Hospital of Hebei Medical University from 2005 to 2010 were retrospectively analyzed. Involved-field irradiation was performed in 284 patients and selective lymph node irradiation was given in 90 patients. Concurrent radiochemotherapy was conducted in 69l patients and sequential radiochemotherapy was performed in 38 patients. The survival analysis was carried out by Kaplan-Meier method. The prognosis analysis was performed by multivariate Cox’s regression model. Results A total of 143 patients (38.2%) had recurrence in GTV. The maximum transverse diameter (GTV-D),GTV volume (GTV-V) and GTV volume/length (GTV-V/L) of GTV patients were significantly longer than those without recurrence in GTV (P=0.008,0.043,0.001). ROC curve analysis showed that the optimal diagnostic thresholds for GTV-D,GTV-L,GTV-V and GTV-V/L for GTV recurrence were 3.5 cm,5.5 cm,24.0 cm³ and 4.6 cm²,respectively (P=0.000,0.003,0.000 and 0.000),and the ratio of recurrence within GTV in the patient group was significantly greater than that in the smaller group (P=0.000,0.002,0.001 and 0.000). GTV-L and GTV-V/L were the independent risk factors of recurrence in GTV (P=0.021 and 0.009). The 3-, 5-and 10-year survival rates of all patients in the whole group were 42.9%, 23.2% and 7.9%, respectively. Multivariate analysis demonstrated that age, T stage, concurrent radiochemotherapy, GTV-D and GTV-V/L were the independent risk factors of survival (P=0.027, 0.000, 0.018, 0.009 and 0.034). The main cause of death in patients with a survival time of more than 5 years was still associated with cancer. Conclusions The locoregional risk factors of esophageal cancer exert significant effect on the recurrence of GTV in patients with N0 esophageal squamous cell carcinoma undergoing radical radiochemotherapy, which can be utilized as the predicting markers. Both GTV-D and GTV-V/L are significantly correlated the 10-year survival of patients.