The prognostic role of diabetes mellitus type 2 in the setting of hepatocellular carcinoma: a systematic review and meta-analysis

AIM: To evaluate the effect of diabetes mellitus type 2 (T2DM) on the outcomes after treatment of hepatocellular carcinoma (HCC). METHODS: PubMed and Cochrane Central Register of Controlled Trials Databases were systematically searched. Three HCC clinical outcomes were explored: death, progressive disease after locoregional therapies, and recurrence. Sub-analysis was performed according to the use of potentially curative (resection, transplantation, termo-ablation) or non-curative therapies. Odds ratios (OR) and 95% confidence intervals (CI) were calculated to compare the pooled data between T2DM and non-T2DM groups. RESULTS: A total of 27 studies were analyzed. Overall, 85.2% of articles were from Asia. T2MD was associated with an increased risk of death (OR 3.60; 95%CI 2.18-5.95; P < 0.001), irrespective of the treatment approach: curative (OR 1.30 95%CI 1.09-1.54; P = 0.003) or non-curative (OR 1.05; 95%CI 1.00-1.10; P = 0.045), increased HCC recurrence (OR 1.30; 95%CI 1.03-1.63; P = 0.03), and increased disease progressiveness (OR 1.24; 95%CI 1.09-1.41; P = 0.001). CONCLUSIONS: Current data provide strong evidence that T2DM unfavorably affects HCC progression and recurrence, and patients' survival after treatment, irrespective of the approach used.