Lantus Does Not Increase Cancer Risk, Claims Sanofi

Sanofi LogoSanofi yesterday presented new data which they say supports the safety profile of their blockbuster drug, Lantus, hours after dismissing claims from a study that using the diabetes treatment more than doubled the risk of developing cancer.

The French giant unveiled new meta-analysis data at the World Diabetes Congress in Dubai, which they say adds to “the wealth of evidence resulting from more than 80,000 patients enrolled in clinical trials and 38 million patient years of treatment exposure to Lantus (insulin glargine)”.

The figures are taken from databases, clinical trials and from a case-control study in several countries (such as Sweden, Germany, Scotland, England and Taiwan) which evaluated the risk for cancer in individuals with diabetes using different insulins.

Peter Boyle, the study’s lead investigator and president of the International Prevention Research Institute in France, said the meta-analysis “highlights the need to go beyond single study reports and utilise all available data”.  “In the context of all available information, the current evidence supports that insulin glargine is associated with no increased risk of cancer as compared to other insulin therapies.  These findings are reassuring for patients and their physicians”, he added.

Sanofi pointed out that they are sponsoring three large Lantus studies, including two retrospective cohort studies and one case-control trial, which are currently being conducted by independent investigators.

News of the meta-analysis came out after results of a study presented at the San Antonio Breast Cancer Symposium that suggested that people who used Lantus had a 2.9 times increased risk of developing cancer.  The research, based on medical records of 23,266 patients in southern Sweden, also found that those taking metformin had an 8% lower chance of developing cancer.

Riccardo Perfetti, head of medical affairs at Sanofi’s diabetes unit, commented that the Swedish study is flawed.  He was quoted by Bloomberg as saying “I find it surprising that today after so many scientific reports on this topic, we’re still discussing these very small studies”.

He added that “patients using insulin may be compared to patients not using insulin, which might be a gigantic methodological mistake.  People using insulin are usually much older and have been diabetic for many years.”

The US Food and Drug Administration (FDA) began a review in July 2009 following the publication of four observational studies, three of which suggested an increased risk of cancer associated with the use of Lantus.  However in January this year, the agency determined that the evidence presented in the studies is inconclusive, due to limitations in how the studies were designed and carried out.


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