SOD2 and gastric cancer: When we pulled patients with GC in the test and verification phases together, the levels of circulating exosomal lncRNA-GC1 for GC as well as for EGC remained higher compared with those in the HDs and patients with precancerous controls (GC vs EGC, t = 6.972; P < .001; GC vs CAG, t = 11.96; P < .001; GC vs IM, t = 13.61; P < .001; GC vs HD, t = 29.38; P < .001; CAG vs IM, t = 0.047; P = .96; IM vs HD, t = 1.019; P = .30) (Figure 4A).