Scientists take step toward obesity vaccine

WASHINGTON (Reuters) - A vaccine that slows down a key hunger hormone kept rats from gaining weight, even when they over ate, U.S. researchers reported on Monday. LONDON (Reuters) - Extracts from a mushroom used for centuries in Eastern Asian medicine may be able to boost the power of a leading chemotherapy drug for prostate cancer, researchers said on Tuesday. LONDON (Reuters) - Mouth cancer develops in two distinct ways which determine the seriousness of the disease, scientists said on Tuesday, a finding that could lead to new ways of preventing and treating it.