In re Onglyza (Saxagliptin) and Kombiglyze (Saxagliptin and Metformin) Products Liability Litigation, No. 22-6078 (6th Cir. 2024)
Annotate this CaseIn a multi-district litigation involving diabetes drug saxagliptin, the plaintiffs claimed that the drug caused their heart failure. They presented a single expert to show the drug could cause heart failure. After a Daubert hearing and expert motions, the United States Court of Appeals for the Sixth Circuit found that the expert's testimony was unreliable due to methodological flaws and therefore excluded it. Subsequently, the district court granted summary judgment for the defendants, rejecting the plaintiffs' claim that other evidence created a genuine issue of material fact. The court also refused the plaintiffs' request for ninety days to find a replacement expert. On appeal, the plaintiffs challenged the district court's exclusion of their expert, its grant of summary judgment, and its refusal to give them more time to find another expert witness. The Court of Appeals affirmed the district court's decisions, stating that the plaintiffs' claims lacked merit. The court found that the expert's reliance on one study to the exclusion of all others was unreliable, that his use of animal data was unreliable due to his admitted lack of qualifications to analyze such studies, and that he did not reliably apply the Bradford Hill criteria - a scientific framework used to analyze whether an association between two variables is causal. The court also found that all jurisdictions require expert testimony to show general causation in complex medical cases such as this one. As the plaintiffs failed to identify a reliable general causation expert, the court granted summary judgment for the defendants. The court also found no good cause to grant the plaintiffs more time to find a replacement expert.
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