Ep138: Amyloid busters- the benefit and the burden

Australia has just approved a second amyloid-targeting therapy for patients with incipient Alzheimer’s dementia. Lecanemab (Leqembi) now joins donanemab (Kisunla) on the Australian Registry of Therapeutic Goods but the impact of both has been modest in Phase III trials to date. After 18 months of therapy they delay progression of disease, as quantified on neurocognitive tests, by around 5 months on average.  For some, the prolonged independence and dignity will justify the $60,000 to $80,000 a year price tag for the drugs. But for the Pharmaceutical Benefits Advisory Committee “the high burden of [donanemab] treatment on both patients and the health system, combined with the risks and modest clinical impact, makes the drug unsuitable for PBS subsidy”. This burden includes specialist consults, gene screening, multiple MRI and PET brain scans, and delivery of monthly or fortnightly infusions, adding up to another $20,000 in costs. Even before considering these logistical requirements, Australian memory clinics don’t have anywhere near the capacity to address the 245,000 new cases of early dementia or mild cognitive impairment every year. Advocates see these disease-modifying therapies as a turning point for dementia research and argue for further investment in the systems infrastructure needed to roll them out. Sceptics argue that the available evidence instead questions the importance of amyloidosis in the Alzheimer’s disease cascade.GuestsProfessor Michael Woodward AM FRACP FANZSGM FAAG FAWMA (Austin Health, Melbourne; University of Melbourne) Dr Chrysanth Pulle FRACP (Prince Charles Hospital, Brisbane)  Chapters 13:16 Time Saved16:18 Costs of treatment 26:44 IMJ paper on resourcing 39:10 Scepticism and stagingProductionProduced by Mic Cavazzini DPhil. Music licenced from Epidemic Sound ‘RGBA’ and ‘Pulse Voyage’ by Chill Cole, ‘A Forest Melody’ by Tellsonic, ‘Axon Terminal’ by Out to the World, ‘Organic Textures 2’ by Johannes Bornlof and ‘Fugent’ by Lupus Nocte. Image courtesy of Wikimedia Commons and University of Pittsburgh. Editorial feedback kindly provided by physicians of the podcast editorial group Ronaldo Piovezan, Aidan Tan, Hugh Murray, Joseph Lee, Rahul Barmanray, Simeon Wong and Sebastian Lambooy. Thanks also to Profs Bruce Campbell, Mike Parsons and Amy Brodtmann and registrars Jamie Bellinge and Karan Singh for additional insights into research methods. Please visit the Pomegranate Health web page for a transcript and supporting references. Login to MyCPD to record listening and reading as a prefilled learning activity. Subscribe to new episode email alerts or search for ‘Pomegranate Health’ in Apple Podcasts, Spotify,Castbox or any podcasting app.