Should these precancerous cases be treated, the cancerization risk of target population would reduce dramatically and the incidence of EC would be decreased down to 2/3.

• 现场临床研究发现，重度和部分中度不典型增生者是癌前病变，如能重点治疗这一群体，则能有效切断目标人群癌变风险的主要来源，可使食管癌的发病率下降2/3。