1. State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
2. Department of Medical Oncology; Sun Yat-sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
3. Department of Experimental Research; Sun Yat-Sen University Cancer Center; Guangzhou 510060 Guangdong P. R. China
4. Department of Medical Oncology, The Fifth Affiliated Hospital; Sun Yat-Sen University; Zhuhai 519000 Guangdong P. R. China
5. Department of Radiation Oncology, The Fifth Affiliated Hospital; Sun Yat-Sen University; Zhuhai 519000 Guangdong P. R. China