The AUCs for the R value, K value, angle, MA, FIB, D-D, MDA, and CD4+/CD8+ in thoracoscopic LC resection were 0.843, 0.684, 0.792, 0.747, 0.835, 0.797, 0.848, and 0.881, respectively (Figure 2 and Table 5). Here, CD4 is linked to laryngotracheoesophageal cleft.