A.大肠癌旁结肠组织，腺体大小一致，排列整齐，细胞中无黄色阳性信号；B.结肠腺瘤组织，腺腔排列较乱，胞浆见淡黄色阳性信号；C.大肠癌组织，不规则腺腔样结构，胞浆见棕黄色强阳性信号A.MnSOD mRNA and protein expression in normal colorectal tissues, with irregular glandular-like structures and no positive signal yellow in cells； B. MnSOD mRNA and protein expression in colorectal adenoma, adenomatous glandular epithelium arranged in a more chaotic, less cytoplasmic staining intensity; C. MnSOD mRNA and protein expression in colorectal carcinoma within the cytoplasm of epithelial cells