Do we have Alzheimer’s disease all wrong?

Every step toward an effective Alzheimer’s treatment seems to be followed by another step back. It’s hard not to feel as if we are running in place, as millions of patients and their families suffer through one of the most harrowing diseases known to humanity.

We went through that two-step again over the past two weeks when the retraction of a landmark study was followed by federal scientific advisers endorsing a new treatment.