Can laparoscopic spleen-preserving splenic hilar lymph node dissection replace prophylactic splenectomy for proximal advanced gastric cancers that invade the greater curvature?

Background and objectives: Proximal advanced gastric cancer that invades the greater curvature is often treated by prophylactic splenectomy because of a risk for metastasis to the splenic hilar lymph node (station No.10). We evaluated whether laparoscopic spleen-preserving splenic hilar dissection (SPSHD) could be a better approach.Methods: We reviewed records of patients with proximal gastric cancer who underwent total gastrec-tomy with No.10 dissection between 2012 and 2018 using our in-house database set. We divided patients by whether they had received SPSHD or splenectomy, first to compare surgical outcomes, and subse-quently to analyze survival outcomes among patients with tumors invading the greater curvature.Results: Of 145 patients enrolled in this study, 82 had SPSHDs and 63 had splenectomies. All SPSHDs were laparoscopic; 80% of splenectomies were laparotomic. Morbidity > grade III was seen in 8.5% of the SPSHD group and 11.1% of the splenectomy group. The median number of retrieved No. 10 nodes was three in each group. In multivariable analysis, SPSHD was not an independent prognostic factor among patients whose tumors invaded the greater curvature (n = 73). Among propensity-matched cohorts (n = 25 each), 5-year relapse-free survival rates were 77.6% in the SPSHD group and 49.9% in the sple-nectomy group.Conclusion: Laparoscopic SPSHD can potentially replace prophylactic splenectomy.(c) 2020 Elsevier Ltd, BASO -The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved.