The levels of CD3 ( + ) , CD4 ( + ) , CD4 ( + ) / CD8 ( + ) , albumin , prealbumin and transferrin were significantly higher in EEN group as compared to TPN group on postoperative day 3 and 7 ( all P < 0.05 ) , while CD8 ( + ) was significantly lower in EEN group ( P < 0.05 ) .