“…Twelve studies were prospective [11, 13-16, 18, 19, 22-24, 29, 30] and nine were retrospective [10,12,17,20,21,[25][26][27][28]. Pooled data, in nine studies that included either gastric and esophagogastric cases [12,17,20,23,26,27] or a combination of upper gastrointestinal malignancies [10,16,29], required data extraction specific to gastric adenocarcinoma.…”