ENO2 and neoplasm: There were significant differences in SUVmax, TLG, and tumor wall thickness between T1-2 and T3 tumors, but no significant differences in MTV, ADCmin, ADCmean, △HU, or any clinical parameters [including sex, age, tobacco and alcohol habits, family history of esophageal cancer, and the serum levels of tumor markers (CA199, CA72.4, CA242, NSE, CYFRA21-1, and SCC)].