Abstract
515 Background: Everolimus has been used widely in cancer patients and is associated with the development of hyperglycemia. Due to confounding factors, everolimus’ specific impact on hyperglycemia has not been well understood. We performed a meta-analysis to determine the risk of hyperglycemia attributable to everolimus in cancer patients of varying tumor types. Methods: PubMed and ASCO conference abstracts up to June 2015 were systematically searched. Eligible studies included randomized controlled trials (RCTs) in which everolimus was compared to placebo in cancer patients with or without additional cancer therapies. Heterogeneity tests were performed to examine between-study differences in hyperglycemia. The incidence and relative risk of all-grade and high-grade hyperglycemia attributable to everolimus were determined using random- or fixed-effects models. Results: A total of 7 phase III and 2 phase II RCTs with various tumors were included in our analysis. Everolimus significantly increased the risk of all-grade (RR = 2.60, 95% CI: 2.03-3.31, P < 0.001) and high-grade (RR = 3.00, 95% CI: 1.72-5.23; P < 0.001) hyperglycemia. The incidences of all-grade and high-grade hyperglycemia attributable to everolimus were 6.8% (95% CI: 3.4-13.2%) and 2.5% (95%: 1.2-4.9%) respectively. The everolimus-specific risk of all-grade hyperglycemia varied significantly with tumor types (P < 0.001), with the highest incidence seen in renal cell carcinoma (27.2%, 95% CI: 22.2-32.8%) and the lowest in breast cancer (3.3%, 95% CI: 1.3-8.2%). No significant variation was found between everolimus alone or everolimus in combination with other agents. Similar results were also found for the risk of high-grade hyperglycemia attributable to everolimus. Conclusions: The specific contribution of everolimus to both all-grade and high-grade hyperglycemia may be modified significantly by tumor types. Close monitoring should be given to patients with renal cell carcinoma.
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