The results show that the serum levels of CEA, GT, MG, EGF of the patients with gastrointestinal neoplasm are higher than those of the patients with benignant disease and obviously lower after operation.

• 结果消化道肿瘤病人的血清CEA、GT、mg、EGF水平，均明显高于消化道良性疾病； 消化道肿瘤病人手术后这4项指标均较手术前明显降低；