三维适形放射治疗局部晚期非小细胞肺癌预后因素分析

目的评估三维适形放疗治疗局部晚期非小细胞肺癌的疗效、毒性及预后因素。方法采用三维适形放射治疗经组织学证实的局部晚期(ⅢA或ⅢB期)非小细胞肺癌患者113例,分析患者的1、2、3年生存率和中位生存期及预后因素。结果全组1、2、3年生存率分别为60.7%、31.6%和22.4%。中位生存期为17个月,其中单独放疗组16个月,序贯放化疗组18个月,同步放化疗组16个月。单因素分析显示,治疗前胸背痛、卡氏评分、血红蛋白、白蛋白水平、大体肿瘤体积(GTV)及近期疗效是影响预后的因素(P值分别为0.033、0.000、0.042、0.028、0.024和0.021);多因素分析显示,疗前卡氏评分是肺癌预后的独立因素。结论三维适形放射治疗局部晚期非小细胞肺癌显示了较好的疗效,放疗前卡氏评分是影响局部晚期非小细胞肺癌预后的主要因素。

Prognosis of locally advanced non small cell lung cancer treated with three dimentional conformal radiotherapy

OBJECTIVE: To summarize our experience and evaluate the prognostic factors of locally advanced non small cell lung cancer (LA-NSCLC) treated with three dimentional conformal radiotherapy (3D-CRT). METHODS: 118 patients with stage IIImA/IIIB non small cell lung cancer were treated with 3D-CRT from Nov. 2001 to Mar. 2005. 113 patients with complete clinical data were eligible for analysis, 45 of them received radiotherapy alone; 39 were treated by concurrent chemoradiation with paclitaxol plus carboplatin in 32 patients and topotecan in 7 patients, and 29 by sequential chemoradiation with platinum-based regiment in most of them. The dose of radiation for the thoracic field ranged from 26 Gy to 75 Gy with a median dose of 60 Gy. GTV and PTV were collected from the 3D treatment plans in 79 and 101 patients, respectively. Overall survival (OS) was calculated using the Kaplan-Meier method. Comparisons among the curves were made using a two-tailed long-rank test. The Cox model was used for multivariate analysis. RESULTS: The 1-, 2- and 3-year overall survival rate was 60.7%, 31.6% and 22.4%, respectively, with a median survival time of 17 months. In univariate analysis, the following characteristics were significantly associated with longer survival: absence of chest pain, good karnofsky performance status (KPS), albumin > 4.2 g/L, hemoglobin > or = 140 g/L (male) or 130 g/L (female), response to radiotherapy and GTV < 100 cm3. However, multivariate analysis revealed that only good KPS was an independent risk factor predicting the survival. CONCLUSION: Three-dimensional conformal radiotherapy is effective in the treatment of locally advanced non-small cell lung cancer with acceptable complications. Karnofsky performance status is the only independent prognositic factor.