Solving the Mysteries of Pregnancy

Photo by Johann Nojhan Dreo via Flickr

In last week’s JAMA, the Pandemic H1N1 Influenza in Pregnancy Working Group reported that their analysis of nationwide data on 2009 influenza A (H1N1) in pregnant women revealed that “early antiviral treatment appeared to be associated with fewer admissions to an ICU and fewer deaths.”  Pregnant women who were not treated with antiviral medication until 3-4 days after they began experiencing flu symptoms were more likely to die than those who were treated within 2 days of symptom onset.  Women who were first treated with medication more than 4 days after symptom onset were 54 times more likely to die than those who were treated within 2 days.

The authors speculate that the “reasons for delayed treatment … could include reluctance of pregnant women or clinicians to use antiviral medication because of concern for risk to the fetus, despite available evidence suggesting that treatment benefit likely outweighs the potential risk.”  Given the shocking 54-fold increased risk of death associated with late initiation of antiviral medication, the authors’ use of the qualifiers “suggesting” and “likely” is noteworthy.  They are forced to hedge because, as a group of experts convened by the CDC acknowledged in late 2009, “[l]ittle is known about the effects of the four currently available influenza medications on the fetus.”

In my article The Mysteries of Pregnancy: The Role of Law in Solving the Problem of Unknown But Knowable Maternal-Fetal Medication Risk (forthcoming in the University of Cincinnati Law Review), I point out that this information gap is not unique to antivirals.  We lack data on the efficacy or safety or both of most drugs when used by pregnant women.  A frequent shorthand explanation for the dearth of information is that you cannot test drugs on pregnant women because of ethical concerns.  Without denying or dismissing the real moral conundrums that arise in maternal-fetal medicine, the information gap is deeper and wider than that.  As Ruth Faden puts it: “Everyone thinks, Oh, my God, research on pregnant women!  All kinds of ethical flags go up.  We don’t have to start with high drama.  [There's enough] low-hanging fruit that we could keep lots of medical researchers busy for a long time.”

Two FDA-led efforts promise to begin connecting the dots: the Medication Exposure in Pregnancy Risk Evaluation Program, which will conduct epidemiological research using data on approximately 1 million births gathered by the 11 participating research sites, and the Sentinel Initiative, which is creating a national electronic system with the goal of, among other things, allowing for prompt investigation of the safety of newly-approved drugs in pregnant women.  Other government agencies also have roles to play.  For example, the house committee report accompanying the Departments of Labor, Health and Human Services and Education Fiscal 2010 Appropriations measure encouraged the NIH “to  expand research on pregnant women with the goals of better understanding the long-term health effects on women of disease states in pregnancy, the proper therapeutics for pharmacologic treatments for pregnant women who face illness, and the safety and efficacy of medications administered to pregnant women and fetuses.”   Finally, industry can and should do more.  Congress should empower FDA to require pharmaceutical companies to sponsor maternal-fetal medication research in appropriate cases, authority the agency already has in the pediatric arena.