2Jema[ A, Bray F, Center M M, eta[. Global cancer sta- tistics [J]. CA Cancer J Clin, 2011, 61(2) :69.
3Ke L. Mortality and incidence trends from esophagus cancer in selected geographic areas of China circa 1970-- 90 [J]. Int J Cancer, 2002, 102(3)271.
4Guohong Z, Min S, Duenmei W, et al. Genetic heterogeneity of oesophageal cancer in high--incidence areas of southern and northern China [J]. PLoS One, 2010,5 (3) : 9 668.
5Zhang W, Bailey--Wilson J E, Li W, et al. Segregation analysis of esophageal cancer in a moderately high--inci- dence area of northern China [J]. Am J Hum Genet, 2000,67(1) :110.
7Yu Y, Taylor P R, Li J Y, et al. Retrospective cohort study of risk--factors for esophageal cancer in Linxian, People's Republic of China [J]. Cancer Causes Control, 1993,4(3) :195.
8Hongo M, Nagasaki Y, Shoji T. Epidemiology of esoph- ageal cancer: Orient to Occident. Effects of chronology, geography and ethnicity [J]. J Gastroenterol Hepatol, 2009,24(5) :729.
9Cheung W Y, Liu G. Genetic variations in esophageal cancer risk and prognosis [J]. Gastroenterol Clin North Am, 2009,38(1) :75.
10Wang Q M, Qi Y J, Jiang Q, et al. Relevance of serum estradiol and estrogen receptor beta expression from a high--incidence area for esophageal squamous cell carei noma in China[J]. Med Oneoi, 2011, 28(1) :188.