1. Key Laboratory of Molecular Biology for High Cancer Incidence Coastal Chaoshan Area Department of Biochemistry and Molecular Biology Shantou University Medical College Shantou Guangdong 515041 P. R. China
2. Department of Pathology the Fifth Affiliated Hospital of Sun Yat‐sen University Zhuhai Guangdong 519000 P. R. China
3. Guangdong Provincial Key Laboratory of Infectious Diseases and Molecular Immunopathology Institute of Basic Medical Science Cancer Research Center Shantou University Medical College Shantou Guangdong 515041 P. R. China