Background: Esophageal carcinoma is one of the commonly malignant tumor. Our country belongs to the high incident nation with the scope of the world. It is seriously threat the safety of people's life. Recently years the patients prognosis was not well though more and more research had be done. 5 year survival rate was only 20%. The change of esophageal squamous cellular DNA content was one of the important biological characters in malignant tumor .We want to detect esophageal squamous cellular DNA content ...