However, differences in WBC (WMD = 0.71, 95% CI: -0.43, 1.86; P = 0.22), Hb (WMD = -0.02, 95% CI: -0.75, 0.71; P = 0.96) and PLT (WMD = -1.90, 95% CI: -17.89, 14.09; P = 0.82) levels between LC patients with and without PE were not significant. This evidence concerns the gene GSTM1 and laryngotracheoesophageal cleft.