1. Institute of Cancer Prevention and Treatment, Harbin Medical University, Harbin, Heilongjiang 150040, P.R. China
2. Fourth Department of Medical Oncology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150040, P.R. China
3. Laboratory Department, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150040, P.R. China