Objectives: To explore the change rule and clinical value of glycyiproline dipeptidyl aminopeptidase (GPDA) in tissues of esophageal and cardiac cancers.

• 摘要目的：探讨甘氨酰脯氨酸二肽氨基肽酶(GPDA)在食管贲门癌组织中的变化规律。