Fda Panel Backs Glaxos Cervical Vaccine For Women
The FDAs panel of vaccine experts voted overwhelmingly Wednesday that Cervarix appears safe and effective for girls and women ages 10 to 25. If the FDA follows the groups advice as it usually does, Glaxo would begin competing against Mercks Gardasil, which has controlled the U.S. market since 2006.
But Merck won its own small victory at the meeting, as the same panel recommended Gardasil be expanded to prevent genital warts in boys, a new use for a vaccine that already posts sales of more than $1 billion.
While panelists favored the expanded approval, they questioned how widely the vaccine would be used, since genital warts are not a serious medical condition.
“Genital warts are a nuisance, theyre ugly and can sometimes be stigmatizing,” said Dr. Kenneth Noller, of Tufts University. “But in men and women with healthy immune systems they go away by themselves.”
The human papilloma virus, or HPV, infects about 6 million people in the U.S. each year, and is mainly spread through sexual contact. It usually causes no symptoms and goes away within two years, though rare cases can develop into warts and cancer in both men and women.
Last year nearly 4,000 women died of cervical cancer in the U.S., less than 1 percent of all cancer related deaths.
London-based drugmaker Glaxo already has won approval for Cervarix in Europe, but its U.S. launch was delayed in 2007 when the FDA said it needed more data.
Panelists said newer studies suggest the vaccine is safe, but they recommended follow-up studies to monitor miscarriages and inflammatory-muscular problems reported by a small number of patients.
The group said it was unlikely those problems were related to the vaccine, but said the issues should still appear on product labeling.
“I think this could be marketed with the usual caveat that its not to be used during pregnancy,” Noller said.
Even if the FDA grants approval, Glaxo will face an uphill battle against competitor Merck. Besides an established brand in the U.S., Gardasil also boasts an extra degree of protection against sexually transmitted diseases.
Gardasil and Cervarix both defend against HPV strains 16 and 18, which cause about 70 percent of cervical cancer cases. But Mercks vaccine also defends against two other HPV types that cause 90 percent of genital warts, something Cervarix does not target.
In separate votes Wednesday, FDAs panel ruled that Gardasil successfully prevents genital warts in boys and men ages 9 to 26.
While an approval decision from the FDA could theoretically double the market opportunity for Gardasil, analysts dont expect much use among males.
“If its not preventing something serious like cervical cancer and there are questions about safety, I think a parents acceptance of the vaccine in young boys might be less urgent than for their girls,” Fernandez said in an interview last week.
Gardasil became an early success story for Merck after its launch, with sales growing to over $1.4 billion last year.
But momentum has slowed amid questions about the longevity of the vaccines effect and its cost effectiveness, considering its price tag of nearly $400.