Among the 36 lung cancers patients, the discriminative sensitivities of CA125, ProGRP, CEA, and CFRA21–1 were 0.061, 0.121, 0.152 and 0.242 respectively, while the 13-VOCs model showed a paired discriminative sensitivity of 0.895 (p < 0.001) (Figures 5A–D, F). The gene discussed is GRP; the disease is lung cancer.