渗出性胸腔积液是临床上常见疾病,对其病因诊断有时很困难,特别是最常见的癌性和结核性胸积液的治疗和预后完全不同,对二者鉴别尤为重要。据文献报道,起源于人体间质、上皮和造血系统的正常有核细胞和恶性细胞均能合成β_2微球蛋白(简称β_2M)。我们依 Exudative pleural effusion is a common clinical disease. It is sometimes difficult to diagnose the cause of pleural effusion. In particular, the treatment and prognosis of the most common cancer and tuberculous pleural effusion are completely different. It is particularly important to distinguish between the two. According to reports in the literature, β 2 microglobulin (abbreviated as β 2 M) can be synthesized from normal nucleated cells and malignant cells that originate from human interstitial, epithelial, and hematopoietic systems. We follow