Methods Serum CA50 content was measured through radioimmunoassay in 54 normal individuals, 176 patients with malignant carcinoma of digestive system and 160 patients with benign diseases.

• 方法采用放射免疫法观察54例正常人,176例消化系统常见恶性肿瘤和160例良性疾病患者血清CA-50含量。