STK11 and laryngotracheoesophageal cleft: Univariate Cox proportional-hazards model showed that high expression of STK11 was a significant protective factor for LC patients, both in terms of PFS (HR=0.42, 95%CI= (0.29-0.61), P<0.001) and OS (HR=0.36, 95%CI= (0.25, 0.53), P<0.001), as shown in Figures 5A, 6A.