1. Department of Thoracic Surgery; National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College; No.17 Panjiayuannanli, Chaoyang District Beijing 100021 P. R. China
2. Qingdao Cancer Institute; Cancer Institute of The Affiliated Hospital of Qingdao University; Qingdao 266003 Shandong P. R. China
3. Zhejiang Provincial Key Laboratory of Pancreatic Disease; The First Affiliated Hospital, and Institute of Translational Medicine, Zhejiang University School of Medicine; Hangzhou 310029 Zhejiang P. R. China
4. Department of Pathology; National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing 100021 P. R. China
5. State Key Laboratory of Molecular Oncology; National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing 100021 P. R. China