In a prospective , randomized , double-blind study , 99 patients with gastric and colorectal cancer receiving elective surgery were recruited and randomly assigned to either the study group , receiving the n-3 PUFAs enriched intravenous fat emulsion ( IVFE ) , or the control group , receiving a lipid emulsion comprised of soybean oil and MCTs ( 0.8 - 1.5gkg-1day-1 ) as part of total parenteral nutrition ( TPN ) regimen from surgery ( day -1 ) up to post-operative day 7 .