Insulin Analogue Glargine Possibly Increases Cancer Risk

The risk of cancer possibly increases if patients with diabetes use the long-acting insulin analogue glargine instead of human insulin. The Institute for Quality and Efficiency in Health Care (IQWiG), in collaboration with the “Wissenschaftliches Institut der AOK” (WIdO), the research institute of the German Local Health Care Fund, analysed the data of almost 130,000 patients with diabetes in Germany who had been treated with either human insulin or the insulin analogues lispro (trade name: Humalog), aspart (Novorapid) or glargine (Lantus) between January 2001 and June 2005.

The analysis has now been published together with further studies in the scientific journal Diabetologia, the official organ of the European Association for the Study of Diabetes (EASD). The disturbing result is that malignancies were found more frequently in patients treated with glargine than in those prescribed a comparable dose of human insulin. “Our analysis does not provide absolute proof that glargine promotes cancer,” says Peter T. Sawicki, IQWiG’s Director and co-author of the study. “Our study does, however, arouse an urgent suspicion which should have consequences for the treatment of patients.”

No difference was found between the short-acting insulin analogues, lispro and aspart, and human insulin. Insulin analogues are synthetic molecules that do not occur naturally, whereas human insulin matches the insulin that the human body manufactures itself.

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