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前言二级预防是在细胞的增生阶段采取有效措施使增生停滞发展或回复正常以减少或消除癌变机会。在食管癌的二级预防工作中必须建立对增生病变的有效诊断方法,即增生细胞的分级。按级别的轻重选择预防对象,也用服药后细胞级别的变化作为评价疗效的标准。慢性食管炎具有促食管上皮增生癌变的作用,治疗食管炎有防癌的意义,因此应研究
Preface Secondary prevention is to take effective measures during the proliferative phase of the cell to make hyperplasia stagnate or return to normal to reduce or eliminate the chance of canceration. In the secondary prevention of esophageal cancer, it is necessary to establish an effective diagnostic method for hyperplastic lesions, that is, the grade of proliferating cells. According to the severity of the selection of the subject of prevention, the change in cell-level after taking the drug is also used as a criterion for evaluating the efficacy. Chronic esophagitis has the effect of promoting the growth and metastasis of esophageal epithelium. The treatment of esophagitis has anti-cancer significance and should therefore be studied.