食管癌的发生率在人群或地区之间都有很大差异。许多环境因素都被怀疑到了,重金属、酒、酒中的某些污染、铁的缺乏、烟草硷、过热饮食、病毒和亚硝胺等都有可能,但迄今任何一种因素都缺乏足够的证据。Cook氏曾提出,在非洲,玉 The incidence of esophageal cancer varies widely among populations or regions. Many environmental factors are suspected, and heavy metals, some wine, some pollution in wine, lack of iron, nicotine, overheated diet, viruses and nitrosamines are all possible, but so far there is not enough evidence for any of the factors . Cook’s had proposed in Africa, jade