1. School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, P.R. China
2. Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
3. Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, MD 20892, USA
4. Department of Biochemistry and Molecular Medicine, Comprehensive Cancer Center, UC Davis School of Medicine, Sacramento, CA 95817, USA
5. State Key Laboratory of Oncology in South China, Sun Yat-Sen University Cancer Center, Guangzhou 510275, P.R. China