93 F.4th 339
6th Cir.2024Background
- Plaintiffs in a multi-district litigation alleged that saxagliptin, a diabetes medication, caused their heart failure.
- The SAVOR trial found a statistically significant increase in heart failure hospitalizations among saxagliptin users, leading to updated drug labeling and lawsuits.
- Plaintiffs relied on a single general causation expert, Dr. Goyal, to establish that saxagliptin can cause heart failure.
- The district court excluded Dr. Goyal’s testimony under Daubert, finding his methods unreliable, then granted summary judgment for defendants due to lack of admissible expert evidence.
- Plaintiffs requested additional time to find a new expert after exclusion, which the district court denied for lack of good cause.
- On appeal, plaintiffs challenged the expert exclusion, summary judgment, and the denial of time to find a new expert.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Exclusion of Dr. Goyal’s Testimony | Goyal’s methodology (reliance on SAVOR and Bradford Hill) was sound and challenges are for the jury | Goyal’s methods were unreliable: ignored contrary evidence, unqualified in animal studies, misapplied Bradford Hill | Exclusion upheld: unreliable methodology under Rule 702 |
| Summary Judgment for Defendants | Other evidence (e.g., labeling, literature) was sufficient for jury on causation | Expert testimony is required in medically complex cases; no reliable causation evidence | Summary judgment affirmed: expert testimony was required |
| Denial of Time for New Expert | Plaintiffs were diligent and deserved more time post-exclusion | Plaintiffs had years to find an expert; more time would prejudice defendants, causing delays and costs | Denial of extension affirmed: no good cause |
Key Cases Cited
- Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 579 (test for admissibility of expert evidence)
- Gen. Elec. Co. v. Joiner, 522 U.S. 136 (trial courts may exclude expert opinions not properly supported)
- Kumho Tire Co. v. Carmichael, 526 U.S. 137 (courts' gatekeeping includes all expert testimony under Rule 702)
- Phillips v. Cohen, 400 F.3d 388 (jury decides weight and credibility of admissible expert testimony)