NDRG2 and gallbladder carcinoma: The expression of NDRG2 protein is significantly low in gallbladder carcinoma, and its expression intensity is closely related to the stage, grade, and clinical prognosis of gallbladder carcinoma; NDRG2 protein may play an important role in the development of gallbladder carcinoma from precancerous lesions, and detection of its expression intensity is helpful for early detection of gallbladder carcinoma in precancerous stage.