Alzheimer’s disease has afflicted Hannah Richardson’s family for generations. A rare genetic mutation, passed down from her great-grandmother, has struck her relatives with the first signs of memory loss at an average age of 39. Last year, her uncle died with dementia at 42. Her mother, now the same age, is in the moderate stages of the disease.
Richardson, 24, has joined a clinical trial hoping to avoid the same fate. She will be one of the youngest people ever to receive an experimental drug intended to prevent dementia-linked amyloid plaques from building up in the first place.
“I knew immediately I wanted to be a part of it,” she told
Endpoints News
in an interview.
The study, helmed by Washington University School of Medicine in St. Louis, will enroll people who carry genes for inherited forms of Alzheimer’s, but who aren’t expected to develop their first symptoms for another 11 to 25 years.
“Amyloid pathology can be identified one to two decades before people develop symptoms,” Eric McDade, a professor of neurology who is leading the study, told Endpoints. “What we’re trying to do is actually show that we can prevent that amyloid pathology from developing.”
They’ll use an experimental Eli Lilly drug called remternetug. It is similar to the Indianapolis drugmaker’s drug Kisunla, which was approved last summer, but is administered as a quarterly injection instead of a monthly infusion.
The trial is expected to last at least six years and cost more than $130 million. Most of the funding, an estimated $98.3 million, will come from the National Institutes of Health. If successful, it could provide one of the most dramatic tests yet of the much-debated amyloid hypothesis.
“This is really going to be a landmark study,” Howard Fillit, chief science officer of the Alzheimer’s Drug Discovery Foundation, told Endpoints. “I believe it is the earliest treatment trial that has ever been conducted.”
For years, drugmakers failed to make a dent in Alzheimer’s, either because they went after the wrong form of amyloid or tested the drugs in patients too deep in the throes of the disease. Two approved drugs, Eisai and Biogen’s Leqembi and Lilly’s Kisunla, are marketed for mild cognitive impairment, the earliest symptomatic stage of Alzheimer’s where brainpower noticeably begins to fade.
But the effects are modest, and the companies have now started identifying patients with blood tests and brain scans, but no outward signs of memory loss, to start treatment earlier. Those tests are now underway. Results from
Lilly’s trial
could come as soon as 2027, and
Eisai’s study
is scheduled to start wrapping up in 2028.
But the WashU Medicine study aims to treat people even earlier, before there’s almost any progression of the disease in the brain. It’s a bet that they might be able to prevent, not just slow, the disease.
“Most of the people that will start this study won’t have any amyloid in their brain that we can detect,” McDade said. “We’re calling it primary prevention.”
Fillit compared the approach to using statins in young people with high cholesterol before they develop coronary artery disease. “Except these are people that don’t even have the biomarker evidence,” he added.
Last week, Richardson went in to get her blood and spinal fluid collected and her brain scanned. The tests will provide a baseline for doctors to track her progress in the years to come.
“I’ve been aware of Alzheimer’s in my family since a young age, so I’ve had a long time to kind of sit with that,” Richardson said. “But now, being the one going through the tests and the imaging and receiving the first dose of the medication in a few weeks, it definitely is eye-opening.”
The study is part of the Dominantly Inherited Alzheimer Network Trials Unit, or DIAN-TU, a closely-watched effort at WashU Medicine to investigate drugs in people with rare mutations who are almost guaranteed to develop the disease.
Richardson’s mom and uncle participated in another DIAN-TU study when they were in their early 30s. Most people in the study already had amyloid plaques by the time they got an experimental Roche drug called gantenerumab. Although the drug seemed to lower amyloid, it didn’t slow cognitive decline.
McDade, the trial leader, originally planned to use gantenerumab again in a primary prevention study, but after it
failed
in Roche’s own trials in 2022, he looked for another option. He landed on remternetug, which seemed like a simpler alternative to Leqembi, infused every two weeks, and Kisunla, infused every month.
“If we really, truly have to treat people for a decade or more, you certainly don’t want them coming in for infusions every two weeks,” McDade said.
Richardson and about 240 other participants in the study will get an injection of remternetug or a placebo every three months for two years.
“What we can’t do, kind of ethically and realistically, is run a placebo-controlled trial for 20 years,” McDade said. As a comparison, the study will include family members who don’t carry the Alzheimer’s risk genes. Measuring amyloid on brain scans is the primary outcome.
After the initial two years, people with the mutations can continue to get injections of the drug in an open-label extension for another four years. Beyond that, McDade expects that people will need less frequent dosing, but the details of how often that will be are to be determined.
Richardson is clear-eyed about her family’s medical history. “I hope there is benefit,” she said. “But even if that is not the outcome, just collecting this data is still so important for helping people down the line not suffer the way that people are suffering now, and that’s really important to me.”