非小细胞肺癌三维适形放疗同期化疗后急性放射性肺炎发生因素分析

目的 分析三维适形放疗同期化疗非小细胞肺癌急性放射性肺炎(RP)的发生率及相关因素.方法 搜集2006年1月到2008年10月间首程行三维适形放疗并同期化疗的非小细胞肺癌病例90例,对相关放射剂量体积资料和治疗毒性的临床资料进行统计分析.结果 1级急性RP的发生率为32.2%,2级30.0%,3级5.6%,4级0%,5级1.1%.临床因素单因素分析有统计学差异的是原发肿瘤部位.剂量学方面当平均肺剂量以17 Gy,V_5、V_(10)、V_(20)、V_(30)、V_(40)分别以47%、36%、24%、23%、22%为界分组时组间差异有统计学意义.多因素分析显示平均肺剂量是独立预测因子.结论 RP的发生发展受到多因素综合作用,制定肺癌尤其是中下叶肺癌的三维放疗计划时应将平均肺剂量控制在17 Gy以下.

Risk factors of acute radiation pneumonitis in patients with non-small cell lung cancer after concur-rent three-dimensional conformal radiotherapy and chemotherapy

Objective To analyze the incidence and related factors of acute radiation pneumonitis (RP) in patients with non-small cell lung cancer (NSCLC) who underwent three-dimensional conformal ra-diotherapy with concurrent chemotherapy. Methods From January 2006 to October 2008, 90 NSCLC pa-tients treated with concurrent chemoradiotherapy were retrospectively reviewed. The clinical characteristics and treatment plan parameters from dose-volume histogram (DVH) were analyzed. Results Grade 1, 2,3, 4 and 5 RP was found in 32.2%, 30.0%, 5.6%, 0% and 1.1% of the patients. Primary tumor loca-tion was the only significant clinical factor in univariate analysis. And significant differences were found when the groups was divided by the mean lung dose (MLD) of 17 Gy, V_(5) of 47% ,V_(10) of 36% ,V_(20) of 24%,V_(30) of 23% and V_(40) of 22%, respectively. Multivariate analysis showed the MLD was the only independent predictive factor of RP. Conclusions Some factors may contribute to the RP. MLD should be set below 17 Gy in three-dimensional conformal radiation, especially when the tumor locates in the lower lobe.