Global News

Throughout the clinical trials, patients were given an intravenous dose of lecanemab or a placebo infusion: those treated with lecanemab appeared to decline more slowly. The drug delayed patients’ worsening by around five months, and the patients treated with the drug were 31% less likely to progress to the next stage of disease.

Dr Ron Petersen, Alzheimer’s expert at the Mayo Clinic, thought that the drug’s impact was “a modest one but I think it’s clinically meaningful,” as even a few months’ delay in disease progression is a positive for individual patients.

However, Dr Madhav Thambisetty from the National Institute on Aging, said, “It is unlikely that the small difference reported in this trial will be noticeable by individual patients.”

Side effects from the drug have included swelling and bleeding of the brain. Most cases were mild or asymptomatic, however two patients have died since joining the trial, due to brain haemorrhaging. Eisai has denied that the deaths are attributable to lecanemab.

Maria Carrillo, chief science officer for the Alzheimer’s Association commented: “We all understand that this is not a cure and we’re all trying to really grasp what it means to slow Alzheimer’s because this is a first.”

She continued, explaining that a delay in cognitive decline early on could be meaningful for “how much time we have with our loved ones in a stage of disease where we can still enjoy family and outings, vacations, bucket lists.”