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Benefit from thoracic radiotherapy in patients with extensive-disease small-cell lung cancer with elevated lactate dehydrogenase

Authors Qin T, Zhou N, Zeng Y, Dinglin X, Zhao Y, Liu H, Chen L

Received 25 September 2015

Accepted for publication 21 December 2015

Published 1 March 2016 Volume 2016:9 Pages 1095—1103


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Jia Fan

Peer reviewer comments 4

Editor who approved publication: Professor Daniele Santini

Tao Qin,1,* Ningning Zhou,1,* Yin-duo Zeng,2 Xiaoxiao Dinglin,2 Yuanyuan Zhao,1 Huai Liu,3,4 Likun Chen1

1Department of Medical Oncology, Sun Yat-sen University Cancer Center, The State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, 2Breast Tumor Center, Sun Yat-sen University Sun Yat-sen Memorial Hospital, Guangzhou, Guangdong, 3Department of Radiotherapy, Hunan Cancer Hospital, 4Department of Radiotherapy, The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Key Laboratory of Translational Radiation Oncology, Changsha, Hunan, People’s Republic of China

*These authors contributed equally to this work

Background: High lactate dehydrogenase (LDH) is associated with a large tumor burden in extensive-disease small-cell lung cancer (ED-SCLC). This study evaluated the benefit of additional thoracic radiotherapy (TRT) in patients with ED-SCLC with elevated LDH.
Methods: We analyzed 94 patients with ED-SCLC and evaluated LDH at Sun Yat-sen University Cancer Center during the period between January 2000 and March 2010. Patients were divided into two groups according to whether TRT was received. Survival was evaluated by the Kaplan–Meier method and Cox’s regression analysis.
Results: The median age of the 94 patients with ED-SCLC was 58.5 years. The main metastatic sites included the liver, bone, brain, and adrenal glands. The response rate in the TRT group was 46.9%. There were 32 patients (34.04%) receiving TRT and 5.3% receiving prophylactic cranial irradiation. The median survival time reached 10 months (95% confidence interval: 8.22, 11.78 months), and the 1-, 2-, and 5-year survival rates were 43.6%, 11.7%, and 2.1%, respectively. There was a significant difference in the median progression-free survival (PFS) and overall survival (OS) between the TRT group and the no TRT group (PFS: 9.0 months vs 6.0 months, P=0.018; OS: 13.0 months vs 9.0 months, P=0.006).
Conclusion: The use of TRT improves the survival of patients with ED-SCLC. Future studies should use the LDH level for categorizing patients for treatment.

Keywords: small-cell lung cancer, extensive stage, thoracic radiotherapy, LDH

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