“…These studies showed dierences in serum cytokine levels between laparoscopic and conventional surgery for IL-1 (1b [174]), IL-6 (1b [36,135,165,176,254,320,322]), CRP (1b [135,140,176,235,254,320], CRP (1b [133,138,174,233,252,318]) and cell-mediated immunity (1b [224]) that have not been con®rmed by other authors (1b [17,198], 2b [89]). In RCTs, postoperative immunological functions seemed to be better preserved after laparoscopic compared to conventional procedures (1b [13,45,151,176,235,276,284,308,321]): however, some trials found no dierences (1b [73,113,173,203,226,248,270,289,295]) and one trial even reported a more pronounced immunodepression after laparoscopy (1b [290]). Additional RCTs examined perioperative stress response and found adrenaline (1b [150]), noradrenaline (1b [150]), and cortisol (1b [150, 174, 303]) decreased to a lesser extent after laparoscopic than after conventional procedures, although one study did not con®rm this result (1b [112]).…”