Alector Therapeutics’ novel Alzheimer’s strategy fails in Phase 2

Alector Therapeutics said Monday that its Phase 2 trial for an experimental Alzheimer’s antibody failed, dealing a blow to what had been one of the leading dark horse approaches to treating the neurodegenerative disease.

The drug, called AL002, is designed to activate a group of surveilling neuronal immune cells called microglia. It was among several efforts, now in or nearing clinical trials, predicated on the notion that modulating the brain’s immune system could slow the degenerative disease. 

In the 381-person trial, however, patients who received AL002 didn’t decline more slowly than patients who were on placebo, as measured by a scale called the Clinical Dementia Rating Sum of Boxes. Alector said the trial also failed to show an effect on secondary measures of cognition and function, or on biomarkers associated with the disease, such as amyloid levels.