387 F. Supp. 3d 323
S.D. Ill.2019Background
- MDL consolidated ~920 cases claiming Mirena (levonorgestrel IUD) causes idiopathic intracranial hypertension (IIH); court prioritized general-causation discovery.
- Plaintiffs proffered seven general-causation experts; court excluded all under Daubert (Oct. 24, 2018), leaving no expert proof that Mirena can cause IIH.
- Bayer moved for summary judgment limited to general causation, arguing plaintiffs cannot meet that element without expert proof or admissible corporate admissions.
- Plaintiffs argued (1) general causation is not required or can be proved by lay evidence (e.g., studies, adverse-event reports, regulatory labels, alleged admissions), (2) they could rely on individual differential-diagnosis evidence later, and (3) summary judgment now would violate the Seventh Amendment.
- Court held general causation is a required element in complex pharmaceutical/product-liability cases, expert proof normally necessary, and the non-expert materials proffered (Valenzuela study, adverse-event reports, Jadelle label, snippets of excluded expert testimony, Bayer witness deposition excerpts) do not create a genuine issue of fact.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether general causation (product capable of causing injury) is a required element | General causation not required; specific causation/differential diagnosis suffices | General causation is required in complex product/medical cases | Required: plaintiffs must show Mirena can cause IIH before specific causation is reached |
| Whether expert testimony is categorically required to prove general causation | Expert testimony not strictly required; non-expert evidence or admissions may suffice | Expert testimony generally required where issue beyond juror knowledge | Not categorical: admission theory preserved, but where issue is scientifically complex, expert proof is ordinarily required; plaintiffs offered none admissible |
| Whether plaintiffs' non-expert materials (Valenzuela study, adverse event reports, Jadelle label, excerpts of experts/Bayer witnesses) create a triable issue on general causation | These materials, alone or combined, allow a jury to infer causation | Materials are insufficient, speculative, or confounded; cannot substitute for reliable expert analysis | Insufficient: Valenzuela shows correlation and acknowledges confounding; adverse-event reports and labels are inadequate; snippets of excluded expert testimony cannot be used to bootstrap lay inference |
| Whether entry of summary judgment now (after general-causation discovery but before plaintiff-specific discovery) violates the Seventh Amendment | Premature and unconstitutional because plaintiff-specific discovery not done | Summary judgment appropriate where no genuine issue of material fact exists; staged discovery was ordered to resolve threshold issue efficiently | No Seventh Amendment violation; summary judgment proper because plaintiffs lacked admissible evidence of general causation |
Key Cases Cited
- Daubert v. Merrell Dow Pharm., 509 U.S. 579 (1993) (trial court gatekeeping role for expert admissibility)
- Celotex Corp. v. Catrett, 477 U.S. 317 (1986) (summary judgment standards and burdens)
- Parklane Hosiery Co. v. Shore, 439 U.S. 322 (1979) (summary judgment does not violate the Seventh Amendment)
- Amorgianos v. Nat'l R.R. Passenger Corp., 303 F.3d 256 (2d Cir. 2002) (requirement of admissible expert proof on general and specific causation in complex cases)
- In re Zoloft (Sertraline Hydrochloride) Prods. Liab. Litig., 858 F.3d 787 (3d Cir. 2017) (Bradford Hill factors are an epidemiological methodology that must be reliably applied)
- In re Mirena IUD Prods. Liab. Litig., [citation="713 F. App'x 11"] (2d Cir. 2017) (affirming exclusion/summary-judgment framework in prior Mirena MDL)