Article: GlaxoSmithKline goes head-to-head with Merck's HPV vaccine.

Byline: Thomas Ginsberg

(DIVERSITY) (PHOTOS)

(HAS TRIMS)

PHILADELPHIA _ A global marketing war over a potentially multibillion-dollar cancer vaccine is about to escalate.

GlaxoSmithKline P.L.C. said Wednesday it will sponsor the unusual clinical trial of two cancer vaccines directly against each other to see which works better _ Gardasil made by Merck & Co. Inc., or its own experimental vaccine Cervarix, which is expected to hit the market this year.

It's the kind of expensive, high-risk comparison that companies undertake only if forced by regulators or only for high-profit prescription drugs _ not for a vaccine. At stake is ...

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