"Deemed export controls have very limited efficacy for a relatively high cost of compliance, " says Claude Canizares, the Massachusetts Institute of Technology's vice president for research.

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Whether American doctors addicted to expensive high-tech treatments whose apparent efficacy may be largely due to the placebo effect (think many types of back surgery) would ever do this is another question entirely.

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Vitamin manufacturers are to invited to submit evidence of the efficacy and safety of their high-dose products.

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But the stock has traded at less than a third of its 52-week high since Genentech, building on a string of clinical successes, released data showing that its Lucentis had unprecedented efficacy against some types of AMD, perhaps even reversing the disease.

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