Most trials report 6–24 month follow-up; longer data are scant. Some patients see improvement fade within 12–18 months. Underlying neurodegeneration is expected to progress regardless, so durable long-term benefit is biologically unlikely without continuous neuroprotection. Repeated infusions are sometimes proposed without evidence of cumulative benefit.
Parkinson's disease results from progressive loss of dopamine-producing neurons in the substantia nigra. Stem-cell research pursues two complementary routes: neurogenic cells differentiated toward dopamine neurons are studied to replace lost cells and restore dopamine signalling, while placental mesenchymal stem cells are explored for neuroprotection — slowing degeneration through anti-inflammatory and growth-factor secretion. Preclinical evidence suggests dopamine-releasing cells can reinnervate the striatum and that trophic factors may delay neuronal death. Key challenges are achieving cell survival, integration and functional restoration in a degenerating brain. Most trials are early-phase, with modest motor changes reported.
Am I a candidate? → · Parkinson's Disease: full overview → · Parkinson's Disease cost → · Cost →
Medically reviewed by StemCellAtlas’s editorial team with Kiian Nadiia, MD, PhD (Paediatric Neurologist · Medical Director, CSM Clinic Network · 12+ yrs in Autism Spectrum Disorders) of partner clinic Stem Plus (Sofia), against ISSCR, FDA & EMA guidance. Educational information, not medical advice; figures indicative.
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