The Food and Drug Administration is reviewing a new interpretation of the key study of Avandia's heart attack risks, which suggests the drug is as safe as older diabetes drugs.
At a highly unusual meeting this week, the FDA will ask a panel of experts to vote on a range of options for the drug, including lifting restrictions on its use.
The positive safety review from Duke University researchers is the latest twist in a yearslong debate over Avandia, which has divided medical experts, cost Glaxo billions of dollars and possibly resulted in an unknown number of patient heart attacks.
First approved in 1999, Avandia became the top-selling diabetes pill in the world by 2006 with sales of $3.4 billion. But prescriptions plummeted the following year after an analysis of dozens of studies suggested Avandia could raise the risk of heart attack.
For three years the FDA struggled to answer a seemingly simple question: Does Avandia increase the risk of heart attacks? A definitive answer has never been reached, in part because patients with diabetes are already predisposed to heart problems. That makes it extremely difficult to tell which heart attacks are drug-related and which are simply a result of the underlying disease.
Finally in 2010 the FDA decided to restrict the drug's use to all but the rarest of cases. Regulators in Europe banned the drug outright.
FDA critics have speculated that the real purpose of this week's meeting is to vindicate FDA officials who have kept Avandia on the market for so many years. They say regulators appear poised to roll back safety limits on the drug.
"It's the wrong reason to take a regulatory action," said Dr. Steven Nissen of the Cleveland Clinic, who authored the 2007 analysis that first raised public safety concerns about Avandia.
"You want to take a regulatory action because it's going to benefit patients. I don't see how patients could possibly benefit from lifting these regulatory restrictions."
Nissen says he requested time to make a formal presentation during the meeting but was turned down by FDA officials.
The FDA says Wednesday and Thursday's meeting was prompted by a new analysis of the lone study of Avandia's heart risks. Known as RECORD, the study followed 4,400 patients and tracked rates of heart attack, hospitalization and death for six years.
The results were first reported in 2009 and medical experts have been debating their legitimacy ever since.
At the last Avandia panel meeting in 2010, FDA leadership generally backed RECORD's findings that Avandia appeared as safe as other standard diabetes drugs. But FDA staff scientists said the study was unreliable because of underreported heart attacks and other design flaws. Because of that disagreement the FDA asked Glaxo to obtain an independent analysis by an outside party.
The new analysis by the Duke Clinical Research Institute generally supports Glaxo's original findings. In a review memo posted Monday, three senior FDA drug officials state: "After re-adjudication, we do not find a cardiovascular signal of concern in RECORD. The mortality data are, in fact, reassuring."
Despite that assessment, the agency says it "has not reached any final updated conclusions" on the heart safety of Avandia.
The FDA will seek advice from two panels comprised of outside experts in the fields of diabetes and drug safety.
The panelists will be asked to vote on four options for Avandia:
- Removing the drug's safety restrictions
- Leaving the safety restrictions in place
- Modifying the safety restrictions
- Withdrawing the drug from the market entirely
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