1. State Key Laboratory of Molecular Oncology, Department of Abdominal Surgery, and Department of Pathology, Cancer Institute & Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100021 P. R. China, State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing, 102206 P. R. China, and Center of Basic Medical Sciences, Navy General Hospital, Beijing 100037, P. R. China