FOXD3-AS1 had an AUC of 0.959 (95% confidence interval (CI): 0.926–0.992) in identifying patients with SCLC out of HS (Figure 4(a) and Table 3), an AUC of 0.763 (95% CI: 0.670–0.855) in identifying patients with LUAD out of HS (Figure 4(b) and Table 3), an AUC of 0.854 (95% CI: 0.782–0.927) in identifying patients with LUSC out of HS (Figure 4(c) and Table 3), and an AUC of 0.859 (95% CI: 0.802–0.915) in identifying patients with LC out of HS (Figure 4(d) and Table 3). This evidence concerns the gene FOXD3 and small cell lung carcinoma.