摘要Objective: To discuss the effects of minimally invasive surgery under transrectal anoscope on pain stress, gastrointestinal hormones and vascular endothelial function in patients with rectal cancer. Methods Totally 64 patients with rectal cancer who underwent minimally invasive surgery under transanal anastomosis from January 2017 to December 2018 in our hospital were selected as the observation group and the retrospective analysis of clinical data was conducted. Another 64 patients who underwent traditional laparotomy at the same time in our hospital were selected as the control group. Pain stress, gastrointestinal hormones, vascular endothelial function, and tumor marker changes were compared between the two groups. Results There were no significant differences in pain stress index, gastrointestinal hormone, vascular endothelial function index and tumor marker level between the two groups before operation (P>0.05). After operation, the levels of SP, BK and PGE2 in the two groups were higher than those before surgery (P<0.05), and the levels of GAS, MTL, VIP, VEGF, MMP-9, ET-1, CEA, CA724, CA125 and CA19-9 were higher with preoperative reduction of P<0.05. The levels of SP, BK, PGE2, VEGF, MMP-9, ET-1, CEA, CA724, CA125 and CA19-9 in the observation group after operation were lower than those in the control group (P<0.05), and the GAS, MTL and VIP levels were significantly higher than the control group (P<0.05). Conclusion Minimally invasive surgery under transanal anoscope can reduce the pain stress of patients with rectal cancer, and the influence of gastrointestinal hormones is slight. It can effectively reduce the vascular endothelial function index and tumor marker level, help the immune function recovery of patients, and promote postoperative rehabilitation of patients.