Miv-cel CD19 CAR T-Cell Therapy Shows Efficacy and Safety in Stiff Person Syndrome
Release Date: 06/11/2026
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info_outlineDr. Shuvro Roy and Dr. Amanda Piquet discuss a brief overview of stiff person syndrome, as well as the trial and the trial results.
Read more about this abstract on the AAN website.
Show transcript:
Dr. Shuvro Roy:
Hi, this is Shuvro Roy from the University of Washington and welcome to today's Neurology Minute. I just wrapped a longer conversation with Amanda Piquet from the University of Colorado Anschutz School of Medicine. We were just talking about the recent Phase 2 trial evaluating Miv-cel Kyverna Therapeutics' anti-CD19 CAR T-cell therapy in patients with Stiff Person Syndrome. Amanda, would you mind taking us through a brief overview of SPS as well as the trial and their trial results?
Dr. Amanda Piquet:
So Stiff Person Syndrome, or SPS, is a rare disabling autoimmune neurologic disease with a major unmet need. About 80% of patients ultimately lose their mobility and we currently have no FDA approved therapies. Existing treatments like IVIG, rituximab, and plasmapheresis are all used off label, often requiring chronic dosing and frequently failing to stop progression. KYSA-8 is a registrational Phase 2 study of 26 patients with refractory SPS. Patients experienced rapid, statistically significant and clinically meaningful improvement across all primary and secondary endpoints. Primary endpoint was the timed 25-foot walk. And this improved by a median of 46% at 16 weeks. Of patients requiring walking aids at baseline, about two thirds no longer needed them by week 16 to complete that 25-foot walk. Some patients who had struggled to walk were even able to run again after treatment.
Another key finding was that all patients discontinued chronic immune therapies and remained off treatment as of the last follow-up. From a safety standpoint, miv-cel was generally well tolerated, with no high grade CRS or ICANS observed. In my opinion, these outcomes are unlike anything we've seen previously with Stiff Person Syndrome and may represent a paradigm shift, not only for SPS, but potentially for other antibody-mediated neurologic diseases more broadly.
Dr. Shuvro Roy:
Just curious, are there any upcoming implications for the application of this treatment for patients, you think, in the coming year or so?
Dr. Amanda Piquet:
Kyverna, the company who developed miv-cel, has initiated a rolling BLA with the FDA for potential approval and this would be, if approved, the first CAR-T therapy for SPS. So we're anxiously awaiting the outcome of that process.
Dr. Shuvro Roy:
Fantastic. Amanda, thank you so much for your time. And if you are intrigued and want to know more details behind the findings in the study as well as a conversation around CAR-T therapy for autoimmune neurologic disease as a whole, I encourage you to check out the Neurology Podcast feed for our full conversation there. Thanks for tuning in.