お知らせ • May 11
Alterity Therapeutics Announces Utility of Quantitative Mri as Biomarker for Multiple System Atrophy
Alterity Therapeutics announced the publication of a peer-reviewed study in NeuroImage, a leading journal in human brain imaging, demonstrating that quantitative susceptibility mapping (QSM) MRI can detect disease-specific iron accumulation in the brains of patients with Multiple System Atrophy (MSA), distinguish MSA from Parkinson’s disease, and track clinical disease severity — including in early-stage disease. The publication, entitled “Quantitative Imaging of Iron Dysregulation in Multiple System Atrophy,” utilizes longitudinal data generated through Alterity’s Biomarkers of Progression in Multiple System Atrophy (bioMUSE) Natural History Study, together with additional cross-sectional MSA, Parkinson’s Disease (PD), and healthy control data. The study was led by investigators at Vanderbilt University Medical Center in collaboration with Alterity Therapeutics. The study analyzed high-resolution structural and QSM MRI data from 10 MSA patients followed prospectively for 12 months, and cross-sectional data from 28 MSA patients, 43 PD patients, and 23 age-matched healthy controls. Key findings include: Disease-specific iron accumulation. MSA patients showed significantly higher iron content in the lentiform nucleus — comprising the globus pallidus and putamen — versus both healthy controls and PD (all p. Differentiation from Parkinson’s disease. Iron content in the globus pallidus distinguished MSA from PD with moderate-to-good accuracy (AUC = 0.76–0.79), with comparable performance in the early-stage subgroup — a setting in which clinical misdiagnosis is common. Correlation with clinical severity. Higher iron content was significantly correlated with greater overall disease severity on the Unified Multiple System Atrophy Rating Scale (UMSARS), linking the imaging measure directly to patients’ functional and motor impairment. Longitudinal progression. In preliminary 12-month analyses of the early-stage bioMUSE cohort, both the magnitude and spatial extent of abnormal iron accumulation increased progressively, paralleling clinical decline. Alterity continues to advance ATH434 into a Phase 3 program for MSA. The Company has received positive feedback from the U.S. Food and Drug Administration (FDA) following two recent Type C meetings, with alignment reached on clinical pharmacology and non-clinical development as well as the chemistry, manufacturing, and control (CMC) elements of the program. Alterity remains on track to hold its End-of-Phase 2 meeting with the FDA in mid-2026, the next key step toward initiation of a pivotal Phase 3 trial in MSA. Alterity’s lead candidate, ATH434, is an oral agent designed to reduce iron accumulation and inhibit abnormal protein aggregation associated with neurodegeneration. ATH434 has been shown to reduce a-synuclein pathology and preserve neuronal function by restoring normal iron balance in the brain in preclinical models. As an iron chaperone, it has excellent potential to treat Parkinson’s disease as well as various Parkinsonian disorders such as Multiple System Atrophy (MSA). Positive results from the randomized, double-blind, placebo-controlled Phase 2 clinical trial in patients with MSA demonstrated robust clinical efficacy, target engagement as indicated by key biomarkers, and a favorable safety profile. Positive data from a second Phase 2 open-label biomarker trial in patients with more advanced MSA reinforced these results. ATH434 has been granted Fast Track Designation by the U.S. Food and Drug Administration (FDA), and Orphan Drug Designation by the FDA and the European Commission for the treatment of MSA. Biomarkers of progression in Multiple System Atrophy (bioMUSE) is a natural history study that aims to track the progression of individuals with MSA, a parkinsonian disorder without an approved therapy. The study is being conducted in collaboration with Vanderbilt University Medical Center in the U.S. under the direction of Daniel Claassen, M.D., M.S., Professor of Neurology and Principal Investigator. Natural history studies are important for characterizing disease progression in selected patient populations. The study has provided rich data for optimizing the design of Alterity’s randomized ATH434-201 Phase 2 clinical trial and enrolled approximately 20 individuals with clinically probable or clinically established MSA. BioMUSE continues to provide vital information on early stage MSA patients, informs the selection of biomarkers suitable to evaluate target engagement and preliminary efficacy, and delivers clinical data to characterize disease progression in a patient population that mirrors those currently enrolling in the Phase 2 clinical trial. Multiple System Atrophy (MSA) is a rare, neurodegenerative disease characterized by failure of the autonomic nervous system and impaired movement. The symptoms reflect the progressive loss of function and death of different types of nerve cells in the brain and spinal cord. It is a rapidly progressive disease and causes profound disability. MSA is a Parkinsonian disorder characterized by a variable combination of slowed movement and/or rigidity, autonomic instability that affects involuntary functions such as blood pressure maintenance and bladder control, and impaired balance and/or coordination that predisposes to falls. A pathological hallmark of MSA is the accumulation of the protein a-synuclein within glia, the support cells of the central nervous system, and neuron loss in multiple brain regions. MSA affects up to 50,000 individuals in the U.S., and while some of the symptoms of MSA can be treated with medications, currently there are no drugs that are able to slow disease progression and there is no cure.
