That, he says, is exactly what would be needed for the drug to be approved by the Food and Drug Administration as a disease-modifying agent, not just a treatment of symptoms.

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Among these, the researchers have identified several that help it to be an effective agent of disease.

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He recommended banning the sale of nerve tissue such as brains or vertebrae that can contain the disease's causal agent, as Britain did after its bout with the illness.

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That required the arrival of Yersinia Pestis, the actual causative agent of the disease itself.

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The hormone was prepared from human pituitary glands recovered from cadavers, and the absence of rigorous collection guidelines and purification procedures permitted contamination of the formulated drug with the agent that causes Creutzfeldt-Jacob disease, the human equivalent of "mad-cow disease, " or bovine spongiform encephalopathy (BSE).

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At this point, though, I can say that this should be a very positive step towards establishing beyond any doubt another therapeutic option for patients with GIST using a novel molecularly-targeted agent if Gleevec proves inadequate to control the disease.

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The imaging agent can't be used to diagnose someone with Alzheimer's disease if the individual doesn't experience memory impairment because the presence of amyloid in the brain doesn't alone suggest that someone has Alzheimer's.

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