The LC patients were divided into three groups: Group A: 28 patients whose annual average serum alanine aminotransferase (ALT) level was persistently high (≧80 IU; high‐ALT group); Group B: 28 patients whose annual average serum ALT levels was persistently low (<80 IU; low‐ALT group), and Group C: 13 unclassified patients. Here, GPT is linked to laryngotracheoesophageal cleft.