Comparison of laparoscopic and open simultaneous surgeries for synchronous metastases of colorectal cancer in the liver: meta-analysis

Aim. To analyze studies focused on comparing laparoscopic and open simultaneous surgeries for synchronous metastases of colorectal cancer in the liver.Materials and methods. The electronic databases PubMed, Web of Science, Scopus, Embase, Cochrane Library were searched for the studies focused on the comparison of open and laparoscopic simultaneous surgeries for synchronous metastatic liver lesions, dated till October 20, 2020. Keywords: simultaneous resections, colorectal cancer, liver metastases, simultaneous laparoscopic.Results. Meta-analysis contains the results of 1211 simultaneous surgeries for simultaneous metastases of colorectal cancer in the liver: 450 laparoscopic and 761 open surgeries. Laparoscopic surgery was characterized with lower blood loss [weighted mean difference (WMD) = -131.77, 95% CI: -232.54 to -31.00, p = 0.01], a shorter postoperative hospitalization [WMD = -2.87, 95% CI: -3.41 to -2. 33, p < 0.00001], early first bowel movement [WMD = -0.99, 95% CI: -1.40 to -0.58, p < 0.0001], early initiation of enteral feeding [WMD = -1.20, 95% CI: -2.06 to -0.33, p = 0.007]), lower incidence of postoperative complications [OR = 0.60, 95% CI: 0.46–0.80, p = 0.0004]. A statistically significant advantage of laparoscopic access was established in overall [OR = 0.80, 95% CI: 0.64–0.99, p = 0.04] and recurrence-free survival [OR = 0.73, 95% CI: 0.60–0.89, p = 0.002].Conclusion. Perioperative and distant oncologic outcomes demonstrate safety and efficacy of laparoscopic simultaneous interventions for synchronous metastases of colorectal cancer in comparison with open interventions.