CD4 and laryngotracheoesophageal cleft: There were no significant differences in the percentage of CD4+IL-2+ T cells among all groups prior to surgery (17.2 ± 16.6% in gastric resection, 12.7 ± 11.0% in colorectal resection, 16.2 ± 12.7% in hepatic resection and 8.0 ± 5.8% in LC).