In post-operation day 7 and day 10 , the prealbumin was ( 69 16 ) mg/L and ( 80 22 ) mg/L in EN group and it was ( 67 19 ) mg/L and ( 70 11 ) mg/L in PN group , which are all significantly decreased than preoperational levels ( ( 186 38 ) mg/L for enteral group and ( 179 37 ) mg/L for parenteral group , t = -2.24 , -2.13 , -2.23 , -2.20 , all P < 0.05 ) , but there was no statistically significant between the 2 groups ( P > 0.05 ) .