Abstract:Objective To systematically compare the clinical efficacy of three kinds of gastrointestinal reconstruction on postoperative blood glucose and prognosis of type 2 diabetes mellitus (T2DM) in patients with gastric carcinoma complicated with T2DM. Methods The databases including PubMed, EMBase, COCHRANE Library, CNKI, Wanfang database and Chinese Medical Journal database (CMJD) were searched with the key words of gastric carcinoma, type 2 diabetes mellitus, gastrectomy, gastrointestinal reconstruction, Billroth I, Billroth Ⅱ and Roux-en-y from the date of database establishment to June 2015. Chinese and English literature on gastrointestinal reconstruction via Billroth I, Billroth Ⅱ and Roux-en-y for the treatment of patients with gastric carcinoma complicated with T2DM was retrieved, and data were analyzed by 2 independent researchers. The count data were analyzed using the relative risk (RR) and the quantitative ones were analyzed with the weighted mean difference (WMD). The 95% confidence interval (95% CI) was also presented. Results Seven papers with 758 patients of gastric carcinoma complicated with type 2 diabetes mellitus were included, including 224 patients via Billroth I, 343 patients via Billroth Ⅱ and 191 patients via Roux-en-y reconstruction. All of these papers were retrospectively non-randomized controlled studies. The scores of quality assessment were from 6 to 8. The results of Meta-analysis predicted that the hypoglycemic effect of Billroth Ⅱ was much more effective than that of Billroth Ⅰ (MD = 1.86; 95% CI: 1.02, 2.71; P < 0.05), had better improvement of T2DM course than Billroth Ⅰ (RR = 0.58; 95% CI: 0.40, 0.83; P < 0.05) and better resolution of T2DM course than Billroth Ⅰ (RR = 0.48; 95% CI: 0.27, 0.85; P < 0.05). Moreover, the hypoglycemic effect of Roux-en-y was also much better than that of both Billroth Ⅱ (MD = 0.24; 95% CI: 0.07, 0.42; P < 0.05) and Billroth Ⅰ (MD = 1.81; 95% CI: 0.77, 2.86; P < 0.05) and also got better resolution of T2DM course than Billroth Ⅰ (RR = 0.43; 95% CI: 0.24, 0.77; P < 0.05). Conclusions After gastrectomy and different kinds of gastrointestinal reconstruction, the hypoglycemic effects of Billroth Ⅱ and Roux-en-y are much more efficacious than Billroth I, and Roux-en-y could achieve the best hypoglycemic effect.