Methods: A randomized double blinded controlled study including 14 children with BMT and requiring PN for at least 10 days was conducted using a lipid emulsion with fish oil, or soybean oil. Blood samples at baseline, at 10 days and at the end of the PN were taken to analyze plasma interleukins 1 beta, 2, 6, 8, 10 (IL-10) and tumor necrosis factor alpha (TNF-α).