β_2、微球蛋白(β_2—microglobin简称β_2—m)是正常人血液中一种低分子蛋白质,具有广泛的生物学作用。人类的上皮组织和造血系统的正常细胞和各种恶性细胞均能合成β_2—m。我们尝试测定血清β_2—m水平来作为诊断消化道恶性肿瘤的标志,现介绍如下。 Β_2, microglobulin (β_2-microglobin referred to as β_2-m) is a low molecular protein in the blood of normal people and has a wide range of biological effects. Human epithelial tissues and normal cells of the hematopoietic system and various malignant cells can synthesize β 2 -m. We try to determine serum β 2 -m levels as a marker for the diagnosis of digestive tract malignancy, which is described below.