CD274 and laryngotracheoesophageal cleft: In this study, PD-1 and PDL-1′s positive rates in lung tissue and PPB in the LC were augmented vs. the benign, clarifying that PD-1 and PDL-1′s positive rates in lung tissue and PPB in LC patients were elevated, which was basically associated with the fact that PD-1/PDL-1 was available to implicate in LC patients’ immune modulation and the interaction between the two was available to mediate immune escape control in the engine body.15