大肠癌是常见的消化道恶性肿瘤，其发病率和死亡率在全世界呈上升趋势。因大肠癌起病隐匿，临床难以早期发现，常因诊断过晚而导致不良预后。目前尚无一种简单、敏感及特异性高的检查方法用于大肠癌的筛检。异硫氰酸荧光素标记花生凝集素检测法（FITC—PNA），是利用花生凝集素 Colorectal cancer is a common malignant tumor of the digestive tract, and its incidence and mortality are on the rise throughout the world. Due to the occult onset of colorectal cancer, it is difficult to find clinically early, and often leads to a poor prognosis due to a late diagnosis. At present, there is no simple, sensitive, and specific detection method for the screening of colorectal cancer. Fluorescein isothiocyanate-labeled peanut lectin assay (FITC-PNA) using peanut lectin