alexa Long-term metformin use reduces gastric cancer risk in type 2 diabetics without insulin treatment: a nationwide cohort study.


Chemotherapy: Open Access

Author(s): Kim YI, Kim SY, Cho SJ, Park JH, Choi IJ,

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Abstract BACKGROUND: Metformin use has been associated with a decreased incidence and mortality of various cancers. AIM: To evaluate the association between metformin use and gastric cancer. METHODS: We randomly selected 100 000 type 2 diabetic patients from the 2004 Korean National Health Insurance claim database, and assessed gastric cancer incidence among 39 989 patients (aged 30-97 years) who were regularly treated with anti-diabetic drugs and followed-up from 2004 to 2010. In total, 26 690 patients had used metformin out of 32 978 diabetics who had not regularly used insulin (insulin non-users), and 5855 patients had used metformin out of 7011 regular insulin users. RESULTS: Patients who used metformin showed a lower incidence of gastric cancer than those who did not use metformin, in insulin non-users (P = 0.047, log-rank test). However, in patients on regular insulin, there was no difference of gastric cancer incidence according to metformin use. In insulin non-users, the adjusted hazard ratio (AHR) for metformin use was 0.73 (95\% confidential interval [CI], 0.53-1.01) with borderline statistical significance (P = 0.059). Duration of metformin use was associated with the reduction in gastric cancer risk (AHR, 0.88; 95\% CI 0.81-0.96, P = 0.003), especially in patients who used metformin for more than 3 years (AHR, 0.57; 95\% CI, 0.37-0.87; P = 0.009). CONCLUSION: Metformin use >3 years in type 2 diabetics who do not use insulin is associated with a significantly reduced gastric cancer risk. © 2014 John Wiley & Sons Ltd. This article was published in Aliment Pharmacol Ther and referenced in Chemotherapy: Open Access

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