On the other hand, MMP-9 rs3918242 was also markedly related to LC incidence in the recessive or allelic model in all populations (allelic model, OR = 0.754, 95% CI = 0.570–0.999, p = 0.049; recessive model, OR = 0.355, 95% CI = 0.177–0.712, p = 0.004). The gene discussed is MMP9; the disease is laryngotracheoesophageal cleft.