Opinion for the Court filed by Circuit Judge MIKVA.
This appeal arises from a products liability action seeking recovery for a child’s birth defects allegedly caused by the mother’s use of Bendectin during her pregnancy. For over twenty-five years (1957-1983), Bendectin was a popular medication for morning sickness experienced during early pregnancy. In 1983, the manufacturer of Bendectin, Richardson-Merrell, Inc. (“Merrell”), voluntarily took the drug off the market although the Food and Drug Administration never rescinded approval of the drug. Bendectin has been studied extensively to determine whether it is a human teratogen, i.e. capable of causing birth defects in humans. To date, no published human population or epidemiological study has concluded that there is a statistically significant association between Bendectin and limb reduction defects of the type at issue in this case.
Merrell, the defendant-appellant in this action, appeals a jury’s award of $20 million in compensatory damages for plaintiff-appellees, the Ealys, and appeals the trial court’s order denying its motions for judgment n.o.v. and denying its motions for a new trial. The Ealys cross-appeal the trial court’s order granting a remittitur of the jury’s $75 million punitive damage award. Merrell argues that this court’s decision in
*1160
Richardson v. Richardson-Merrell, Inc.,
We find that this case is squarely within the binding rule articulated in
Richardson:
an expert opinion that Bendectin is a human teratogen which caused the plaintiffs birth defects is without scientific foundation under Federal Rule of Evidence 703 in the face of “a wealth of published epidemiological data” to the contrary.
Because wereverse on the issue of liabil- ity, we need not reach any of the other issues raised on appeal or cross-appeal. I. BACKGROUND
I. Background
sekou Ealywas born in 1979 with conge- nital birth defects of his hands and arms. He has three fingers on one hand and four on the other and no thumbs. His arms are underdeveloped and locked at the elbows. Although he is otherwise a normal child, he has undergone weekly psychiatric therapy to address his mental fixation that his par- ents cut off his fingers to punish him for being naughty. It is undisputed that Sek- ou’s mother took Bendectin during her pregnancy for morning sickness and that extensive evaluation has failed to disclose a clear cause for his malformations.
At trial,the plaintiffs argued that infer- ences drawn from analysis of Bendectin’s chemical composition, in vitro studies of the effects of Bendectin components on animal cells in test tube cultures, in vivo data from studies conducted on animals given Bendectin, and unpublished rein- terpretations of the epidemiological litera- ture are sufficient foundation to support an opinion that Bendectin is a human terato- gen. This was precisely the theory of proof used by the plaintiffs in Richardson. In developing their case, the Ealys intro- duced the testimony of eight expert wit- nesses, only one of whom did not testify in Richardson. This single witness, Dr. Wil- liam McBride, was also the only expert witness whose testimony, introduced by deposition, was based on published studies which he himself had conducted. Based on his study of the effects of doxylamine suc- cinate, an element of Bendectin, on rabbits and marmosets, Dr. McBride opined that Bendectin is a human teratogen.
After hearingthe expert testimony, the jury reached a verdict for the plaintiff, awarding $20 million in compensatory dam- ages and $75 million in punitive damages. The trial court rejected the defendant’s ar- gument, on motion for judgment n.o.v., that the verdict was without scientific foun- dation, concluding instead that there was “substantial conflicting evidence” about which reasonable people could differ. The court also noted that two other juries in similar Bendectin cases tried in the district court had reached verdicts for the plain- tiffs. One of those verdicts was later set aside in Richardson and the other is pend- ing decision on a post-trial motion to set aside the verdict on the authority of Rich- ardson. The trial court upheld the com- the com *1161 pensatory damages award, finding that the $20 million figure did not “shock the conscience” of the court. The court set aside the punitive damages award because there was no evidence of willful disregard or outrageous conduct by the manufacturer,
II. Discussion
A. Standard of Review
In
Richardson,
this court affirmed a judgment n.o.v. in favor of Merrell, holding that an expert opinion that Bendectin caused a child’s limb reduction defects was inadmissible based on the record developed in that case.
B. The Richardson Decision
The
Richardson
court concluded that there was not sufficient evidence in the record on which a jury could base a verdict for the plaintiff because all of the plaintiff’s expert testimony — the only relevant evidence on the causation issue — was inadmissible. Relying on Federal Rule of Evidence 703, the court ruled, in essence, that the issue of scientific causation should not have been left to the jury because Dr. Alan Done’s expert opinion that Bendectin caused the plaintiff's birth defects lacked an adequate scientific foundation. Dr. Done served as the lead expert for the plaintiffs in both
Richardson
and this case, The
Richardson
court’s treatment of Dr. Done’s testimony subsumed that of the other experts presented on the Richardsons’ behalf.
Rule 703 governs the “Bases of Opinion Testimony by Experts,” and requires that the grounds relied upon by an expert be of “a type reasonably relied upon by experts in the particular field in forming opinions or inferences upon the subject.” Fed.R. Evid. 703. The Richardson court noted that Dr. Done had predicated his opinion on four types of data. After canvassing the probative value of each type of data, the court concluded:
These three types of studies then— chemical, in vitro, and in vivo — cannot furnish a sufficient foundation for a conclusion that Bendectin caused the birth defects at issue in this case. Studies of this kind, singly or in combination, are not capable of proving causation in human beings in the face of the overwhelming body of contradictory epidemiological evidence. Perhaps mindful of this, the last type of evidence considered by Dr. Done consisted of the epidemiological studies. When such studies are available and relevant, and particularly when they are numerous and span a significant period of time, they assume a very important role in determinations of questions of causation.
[o]nly by recalculating the [published epidemiological] data ... to obtain what he deems a statistically significant result. Moreover, the studies rejected by Dr. Done had been published in peer-reviewed scientific journals, while Dr. Done *1162 has neither published his recalculations nor offered them for peer review.
Id. at 831.
The
Richardson
court distinguished its case from our decision in
Ferebee v. Chevron Chemical Co.,
[A] cause-effect relationship need not be clearly established by animal or epidemiological studies before a doctor can testify that, in his opinion, such a relationship exists. As long as the basic methodology employed to reach such a conclusion is sound, ... products liability law does not preclude recovery until a “statistically significant” number of people have been injured or until science has had the time and resources to complete sophisticated laboratory studies of the chemical.
The
Richardson
court concluded, as a matter of law, that the “wealth of published epidemiological data ... none of which has concluded that the drug is teratogenic ... must be given their just due.”
Two other circuits have reached similar conclusions.
See Lynch v. Merrell-National Laboratories, Inc.,
Because Richardson provides a binding legal precedent governing the admissibility of expert opinion on the ability of Bendec-tin to cause human birth defects, the Ealys can only avoid that decision by showing that the record here is materially different from that in Richardson. We find no such difference.
C. Evidentiary Differences
Merrell argues that there are no material differences between this case and Richardson because the Ealys have not pointed to any new epidemiological studies on Bendec-tin not introduced in Richardson. The Ea-lys do not refute that the epidemiological studies are identical in both cases. Here, as in Richardson, the plaintiff’s epidemiology expert, Dr. Shanna Swan, tried to re *1163 fute the validity of the published epidemiological data through her own unpublished reanalysis. The chemical structure, in vivo, and in vitro studies relied upon by the Ealys are also virtually the same as those referenced in Richardson with one exception: Dr. McBride testified by deposition as an expert for the Ealys but not for the plaintiffs in Richardson. He testified about his in vivo studies of the effects of doxylamine succinate on rabbits and marmosets. This data, however, along with all the other in vivo, in vitro, and chemical structure data, has dubious significance in the face of the epidemiological data.
The Ealys make no effort to point out differences in the scientific studies introduced in the two cases. Instead, they attempt to distinguish this case from that of Richardson by focusing on specific statements made by various experts on both sides that were not made in Richardson. None of these differences are material. According to Richardson, none of the evidence relied upon by the Ealys’ experts, either singly or in combination, provides an adequate scientific foundation to render the plaintiff experts’ opinions on human causation admissible. The Ealys offer nothing to alter this conclusion.
D. The Erie Doctrine
Equally unavailing is the Ealys’ contention that the
Erie
doctrine requires this court to follow the D.C. Court of Appeals decision in
Oxendine I.
That Bendectin case, which was litigated in the D.C. Superior Court, resulted in a verdict for the plaintiff. The trial judge then granted a judgment n.o.v. for Merrell, but the D.C. Court of Appeals reversed the trial judge and reinstated the jury verdict.
Oxendine I,
The Richardson court specifically rejected the argument that it was required to follow Oxendine I because it was sitting in a diversity action on a state tort claim:
[T]he Richardsons’ Erie challenge must be rejected. We note that the Richard-sons’ argument ignores the differences in the evidence presented in the two cases. Moreover, the Erie doctrine applies to state substantive, not procedural, law to be followed by federal courts exercising diversity jurisdiction_ Because the admissibility of testimony, which is governed by the Federal Rules of Evidence, is the crux of our decision in this case ... the Richardsons’ argument must be rejected.
Richardson,
In any event, the Oxendine I court’s reasoning would not be directly exportable to the Ealys’ cause because, as with Richardson, there are material differences between the evidence in each case. Oxen-dine I was tried in 1983, Richardson in 1986, and the Ealys’ case in 1987. In the intervening years, two large epidemiological studies were published which found no association between Bendectin and birth defects.
III. Conclusion
It may well be that future scientific research will generate new epidemiological or *1164 other types of data providing an adequate basis for an expert’s opinion that Bendectin is a human teratogen that caused a plaintiffs birth defects. Until that day, the existing body of published epidemiological studies, all finding no significant statistical association between ingestion of Bendectin and birth defects, must be recognized as the measuring stick for the admissibility of expert testimony on this issue. On this narrow, procedural issue, this case is the same as Richardson. We reverse the trial judge’s denial of judgment n.o.v. because the expert opinion that Bendectin caused Sekou Ealy’s limb defects was without scientific foundation. We remand to the district court to enter a judgment n.o.v. for Merrell. This conclusion disposes of all other issues raised on appeal and cross-appeal.
So ordered.
