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WASHINGTON — Gardasil, the vaccine that can prevent most cases of cervical cancer in girls, has won the Food and Drug Administration’s blessing as a vaccine to prevent anal cancer, a rare but growing diagnosis in the U.S.
The agency’s approval for Gardasil as an anal cancer vaccine opens the way for the medication’s maker, Merck and Co., to market the vaccine to males between 9 and 26 years old.



