Lymphadenectomy for gastric cancer at European specialist centres

Background and aims: The aim of this project was to evaluate the current practice of D2 in Europe. Materials and methods: In the first part of the study, 18 European high volume gastric cancer centres completed a questionnaire, designed to evaluate their preferred lymphadenectomy in a series of clinical scenarios. Surgeon compliance with international guidelines for lymphadenectomy was evaluated. In the second part, information on 381 gastrectomies performed for primary gastric cancer by participating surgeons from January to December 2015, was retrospectively collected. Results: Surgical choice in clinical scenarios was affected by tumour stage and to a lesser extent, site and histotype. In particular, in early gastric cancer with diffuse histology D2 was recommended by >70% of surgeons, while this percentage dropped to 44% in intestinal histotypes. When surgeons selected a D2 dissection, the procedure was rarely fully compliant with the Japanese guidelines. In the review of gastrectomy experience an adequate number of nodes (≥15 nodes) was retrieved in 97% after D2. The number of retrieved nodes varied with median values ranging from 17 to 35 (p < 0.001) after D2. D2/D2+ was more frequently performed in mixed (80%) and diffuse (78%) cases than in intestinal cases (69%) (p = 0.016). Conclusions: Although an adequate lymphadenectomy was achieved in almost all cases in dedicated centres, there is still variation in the number of retrieved nodes. Tumor histology largely affects surgeon's choice as regards the extent of lymphadenectomy; however, the role of histology in planning surgical procedures needs to be verified in prospective trials.