Methods:Using methods of microfluorescence and ELISA,the levels of Vit A and SIL 2R in serum were determined for 32 esophageal cancer patients and 32 health controls.

• 方法：以微量荧光法和ELISA 法分别对32 例术前食管癌病人和32 例健康对照者同步进行了血清维生素A 和SIL?2R 水平的测定。