Impact of Cytoreductive Nephrectomy on Survival in Patients with Metastatic Renal Cell Carcinoma Treated by Targeted Therapy oleh Yan Song, Chun-Xia Du, Wen Zhang, Yong-Kun Sun, Lin Yang, Cheng-Xu Cui, Yihe-Bali Chi, Jian-Zhong Shou, Ai-Ping Zhou, Chang-Ling Li, Jian-Hui Ma, Jin-Wan Wang, Yan Sun