Reduced number of IFN‐γ producing cells in peripheral blood is a biomarker for patients with renal cell carcinoma oleh Kun‐Jin Wu, Kun Yang, Feng‐Ping Zhang, Si‐Nan Liu, Kai‐Bo Yang, Xiao‐Hua Ma, Xing Zhang, Yan‐Fen Ma, Hui Geng, Zheng Wang, Chang Liu, Ting Lin