[RESULTS] Other general indicators such as the albumin , hemoglobin , total bilirubin , blood urea nitrogen , serum creatinine , serum potassium and serum sodium , revealed no statistical differences in the 2 groups ( P > 0.05 ) ; The total lymphocytes , CD ( + ) 3CD ( + ) 4 and CD ( + ) 3CD ( + ) 8 lymphocytes in PN group was ( 0.687 0.065 ) 10 ( 9 ) / L , ( 0.363 0.029 ) 10 ( 9 ) / L , and ( 0.183 0.018 ) 10 ( 9 ) / L respectively in post-operation day 10 , which they are significantly decreased than in preoperational levels of PN group and the respective counterpart of EN group in post-operation day10 ( t = -2.04 -2.83 , P < 0.05 ) .