Yun Tian1, Lugen Zuo2. 1. Department of Oncology, Shanghai Dermatology Hospital, Tongji University, Shanghai 200443, China and, Department of Oncology, Tongji University Cancer Center, The Shanghai Tenth People's Hospital, Tongji University, Shanghai, China. 2. Department of Gastrointestinal Surgery, First Affiliated Hospital of Bengbu Medical College, Bengbu, Anhui, China.