In differentiating between lung cancers and benign lesions, the areas under the curve (AUC) of SUVmax, CEA, CYFRA21-1, SCC-Ag and NSE were 0.767, 0.769, 0.744, 0.641 and 0.756 respectively, as shown in Table 4. The gene discussed is ENO2; the disease is lung carcinoma.