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Impact of radiotherapy-related factors on survival in non-small cell lung cancer complicated with malignant pleural effusion based on propensity score matching
Li Qingsong, Ouyang Weiwei, Su Shengfa, Ma Zhu, Geng Yichao, Yang Wengang, Hu Yinxiang, Li Huiqin, Li Xiaoyang, Chen Xiaxia, Lu Bing
Department of Thoracic Oncology, Affiliated Hospital of Guizhou Medical University, and Guizhou Cancer Hospital, Guiyang, Teaching and Research Section of Oncology, Guizhou Medical University, Guiyang 550004, China
AbstractObjective To analyze the radiotherapy-related factors affecting the survival of non-small cell lung cancer (NSCLC) patients complicated with malignant pleural effusion (MPE)(MPE-NSCLC). Methods From 2007 to 2019, 256 patients pathologically diagnosed with MPE-NSCLC received primary treatment. Among them, 117 cases were enrolled in this study. All patients were divided into two groups according to the radiation dose (<63Gy and≥63Gy). Propensity score matching (PSM) was performed to further adjust the confounding factors (Calipers value=0.1). The impact of radiotherapy-related factors on the overall survival (OS) was analyzed by Kaplan—Meier method, log-rank test and Cox’s regression model. Results Primary tumor radiotherapy significantly prolonged the OS (P<0.001). The radiation dose escalation (36.0-44.1Gy, 45.0-62.1Gy, 63.0-71.1Gy) of primary tumor significantly prolonged the OS (P<0.001). The corresponding median OS were 5, 13 and 18 months, respectively. Before the PSM,univariate analysis suggested that radiation dose ≥63Gy, gross tumor volume (GTV)<157.7cm3 and stations of metastatic lymph node (S-mlN)≤5 were significantly associated with better OS (all P<0.05) and T4N3 was significantly associated with worse OS (P=0.018). After the PSM,univariate analysis indicated that radiation dose ≥63Gy was significantly associated with better OS (P=0.013) and S-mlN ≤5had a tendency to prolong the OS (P=0.098). Prior to the PSM, multivariate analysis showed that radiation dose ≥63Gy was an independent favorable factor of OS (HR=0.566,95%CI 0.368-0.871,P=0.010) and GTV<157.7cm3had a tendency to prolong the OS (HR=0.679,95%CI 0.450-1.024,P=0.065). After the PSM, multivariate analysis revealed that radiation dose ≥63Gy was still an independent favorable factor of OS (HR=0.547,95%CI 0.333~0.899,P=0.017). No ≥grade 4 radiation toxicity occurred. The incidence rates of grade 3 radiation esophagitis and pneumonitis were 9.4% and 5.1%, respectively. Conclusion For MPE-NSCLC, radiotherapy dose of primary tumor may play a key role in improving OS on the basis of controllable MPE.
Corresponding Authors:
Lu Bing, Email:lbgymaaaa@163.com
Cite this article:
Li Qingsong,Ouyang Weiwei,Su Shengfa et al. Impact of radiotherapy-related factors on survival in non-small cell lung cancer complicated with malignant pleural effusion based on propensity score matching[J]. Chinese Journal of Radiation Oncology, 2021, 30(2): 120-126.
Li Qingsong,Ouyang Weiwei,Su Shengfa et al. Impact of radiotherapy-related factors on survival in non-small cell lung cancer complicated with malignant pleural effusion based on propensity score matching[J]. Chinese Journal of Radiation Oncology, 2021, 30(2): 120-126.
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