More and more data suggest that treatment for Alzheimer’s disease may be more effective if started early, even before symptoms appear. In addition, recent clinical trials of treatments for mild to moderate Alzheimer’s have failed, suggesting that waiting to treat the disease until these stages may be too late, and that once the degenerative process has started it cannot be stopped. But since Alzheimer’s has no identifiable markers in its early stages, how would doctors know when and whom to treat?

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