T Rokkas1, P Portincasa2. 1. Gastroenterology Clinic, Henry Dunant Hospital, Athens, Greece. Electronic address: sakkor@otenet.gr. 2. "Aldo Moro" University, Bari Medical School, Bari, Italy.
Abstract
BACKGROUND: A growing body of evidence has suggested that metformin potentially reduces the risk of cancer. OBJECTIVE: We performed a meta-analysis of available studies to better define the effect of metformin on colon neoplasia (cancer and polyps) in patients with type 2 diabetes. METHODS: Medical literature searches for human studies were performed through December 2015, using suitable keywords. Pooled estimates were obtained using fixed or random-effects models. Heterogeneity between studies was evaluated with the Cochran Q test whereas the likelihood of publication bias was assessed by constructing funnel plots. Their symmetry was estimated by the Begg and Mazumdar adjusted rank correlation test and by the Egger's regression test. In addition subgroup and sensitivity analyses were performed. RESULTS: A total number of 709,980 patients, with type 2 diabetes, were included in 17 studies eligible for meta-analysis [1 RCT and 16 observational studies (13 cohort and 3 case-controls)]. The risk of colon neoplasia was significantly lower among metformin users than controls (non-metformin users) [pooled RRs (95% CI)=0.75 (0.65-0.87), test for overall effect Z=-3.95, p<0.001]. This observation applied separately for colon cancer [0.79 (0.69-0.91), Z=-3.34, p<0.001] and for colon polyps [0.58 (0.42-0.80), Z=-3.30, p<0.001]. CONCLUSION: This meta-analysis shows that the use of metformin in patients with type 2 diabetes is associated with significantly lower risk of colon neoplasia.
BACKGROUND: A growing body of evidence has suggested that metformin potentially reduces the risk of cancer. OBJECTIVE: We performed a meta-analysis of available studies to better define the effect of metformin on colon neoplasia (cancer and polyps) in patients with type 2 diabetes. METHODS: Medical literature searches for human studies were performed through December 2015, using suitable keywords. Pooled estimates were obtained using fixed or random-effects models. Heterogeneity between studies was evaluated with the Cochran Q test whereas the likelihood of publication bias was assessed by constructing funnel plots. Their symmetry was estimated by the Begg and Mazumdar adjusted rank correlation test and by the Egger's regression test. In addition subgroup and sensitivity analyses were performed. RESULTS: A total number of 709,980 patients, with type 2 diabetes, were included in 17 studies eligible for meta-analysis [1 RCT and 16 observational studies (13 cohort and 3 case-controls)]. The risk of colon neoplasia was significantly lower among metformin users than controls (non-metformin users) [pooled RRs (95% CI)=0.75 (0.65-0.87), test for overall effect Z=-3.95, p<0.001]. This observation applied separately for colon cancer [0.79 (0.69-0.91), Z=-3.34, p<0.001] and for colon polyps [0.58 (0.42-0.80), Z=-3.30, p<0.001]. CONCLUSION: This meta-analysis shows that the use of metformin in patients with type 2 diabetes is associated with significantly lower risk of colon neoplasia.
Authors: Brandy M Heckman-Stoddard; Andrea DeCensi; Vikrant V Sahasrabuddhe; Leslie G Ford Journal: Diabetologia Date: 2017-08-03 Impact factor: 10.122
Authors: Nieves González; Isabel Prieto; Laura Del Puerto-Nevado; Sergio Portal-Nuñez; Juan Antonio Ardura; Marta Corton; Beatriz Fernández-Fernández; Oscar Aguilera; Carmen Gomez-Guerrero; Sebastián Mas; Juan Antonio Moreno; Marta Ruiz-Ortega; Ana Belen Sanz; Maria Dolores Sanchez-Niño; Federico Rojo; Fernando Vivanco; Pedro Esbrit; Carmen Ayuso; Gloria Alvarez-Llamas; Jesús Egido; Jesús García-Foncillas; Alberto Ortiz Journal: Oncotarget Date: 2017-03-14