研究单位：[1]Sichuan Cancer Hospital and Research Institute[2]Jiangsu HengRui Medicine Co.,Ltd.
研究目的：
The study is to evaluate the efficacy and safety of Apatinib as maintenace therapy for Nasopharyngeal Carcinoma With Metastasis after Chemoradiotherapy,including progress free survival(PFS)、overall survival (OS)、Quality of life score (QoL) and evaluation of drug safety.
