Placebos Administered to Pregnant Women With Genital Herpes Simplex Virus Resulted in Unnecessary Cesarean Deliveries

WASHINGTON, D.C. – Dozens of primarily indigent pregnant women enrolled in a drug-company sponsored research trial were needlessly put at risk by being treated with a placebo rather than a generic drug proven to help them, according to a letter authored by Public Citizen and two medical school professors and obstetricians published in the December edition of the journal Obstetrics & Gynecology. 

The trial, funded by Glaxo-Wellcome (now GlaxoSmithKline), measured the efficacy of valacyclovir administered to pregnant women with a history of genital herpes simplex virus (HSV) in reducing outbreaks of genital HSV lesions at the time of labor. Women with HSV outbreaks during pregnancy, especially those who experience a first episode, are more likely to have another outbreak while in labor. When this occurs, a Cesarean delivery is routinely performed to prevent HSV transmission to the baby, which can result in sometimes-fatal neonatal HSV infection.

The clinical trial ran from April 1998 to November 2004 at Parkland Hospital in Dallas, which serves a predominantly low-income population. The results were published in the July 2006 edition of Obstetrics & Gynecology, the official journal of the American College of Obstetricians and Gynecologists (ACOG). 

Valacyclovir is a drug that is converted in the body into acyclovir. Since 1999, acyclovir has been recommended by ACOG to be considered at 36 weeks of gestation for pregnant women with their first episode of HSV during that pregnancy to prevent another outbreak at the time of labor and the need for a Cesarean delivery. The authors of the study ignored this guideline by including in the trial 62 women who had a first episode of genital HSV during the pregnancy, most presumably recruited after the ACOG guidelines were published.

In addition, four of the researchers who wrote the 2006 article published a review article in 2003 that concluded that acyclovir significantly reduced Cesarean rates for women with both first and recurrent episodes of HSV compared to a placebo. Nonetheless, for more than a year after submitting their findings, the researchers continued to enroll women with both first and recurrent episodes, half of whom received placebos.

“At the very same time these researchers were publishing their conclusion that acyclovir could reduce Cesareans, they weren’t offering this drug to these indigent patients,” said Dr. Adam Urato, an obstetrician at the University of South Florida and one of the letter’s authors. “They were knowingly placing their patients at higher risk. Did the patients understand that the researchers themselves had concluded that acyclovir reduced the risk of Cesarean?”

As a result of this conduct by both the drug company and the researchers, a significant number of the women assigned to receive the placebo had an HSV outbreak that led to a Cesarean section – an outbreak that likely could have been prevented if they had been appropriately treated with acyclovir. The Declaration of Helsinki, developed by the World Medical Association as a statement of ethical principles in medical research involving human subjects, states that any “new method should be tested against those of the best current prophylactic, diagnostic, and therapeutic methods.”