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应用放射免疫分析法测定40例结、直肠癌患者癌组织和癌周肠上皮组织中表皮生长因子（EGF）含量，结果显示，结、直肠癌患者癌组织中EGF含量明显高于对照组（P＜0．001），提示癌组织内EGF有特异性积累。
Radioimmunoassay was used to determine the epidermal growth factor (EGF) content in cancer tissue and pericancerous intestinal epithelium in 40 patients with colorectal cancer. The results showed that the EGF content in cancerous tissue of patients with colorectal cancer was significantly higher than that in the control group (P). <0.001), indicating specific accumulation of EGF in cancer tissues.