To investigate the effects of Helicobacter Pylori L form(Hp L) infection on bcl 2 protein expression in esophageal cancer(EC),esophageal precancerrous lesiors(EPL) and the pathogenesis of EC.

• 目的研究幽门螺杆菌L型(HpL)感染对食管癌及癌前病变凋亡调节基因bcl2蛋白表达的影响,探讨Hp-L在食管癌发生发展过程中可能的致癌机制。