Jada Bascom Foundation
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Autoimmune conditions

Stiff-person spectrum disorder

Also called: SPSD · SPS · PERM · GAD65-antibody stiff-person syndrome · GlyR-antibody SPS · Stiff-person syndrome · Stiff-man syndrome · Progressive encephalomyelitis with rigidity and myoclonus

What a donor has to do with this

A transplant is not a standard part of treating this condition. It is used rarely, in particular situations, and most people diagnosed with it will not have one.

This is our reading of published transplant guidelines for this condition, not a measurement of how many people need a donor. Where a source actually counted donors, the figure and the people it counted are shown further down. Where none did, we say so rather than estimate.

What the evidence says

Who it affects
In the Johns Hopkins cohort observed from 1997–2022 and published in 2024, stiff-person spectrum disorder began at a mean age of about 43, diagnosis followed a median 36 months later, and nearly 76% of patients were female.
Treatments other than a transplant
Diazepam or other benzodiazepines and baclofen are principal symptomatic antispasmodic therapies; rehabilitation and trigger management are essential.; IVIg has the best-established immunotherapy evidence; plasma exchange, rituximab, mycophenolate, or other immunosuppression are selected case by case.; No drug or HCT approach is established as a universal cure across the heterogeneous spectrum.
If a transplant is used, the cells come from
autologous mobilized peripheral-blood stem cells (dominant contemporary source); bone marrow: not reported in the opened disease-specific sources; cord blood: not reported in the opened disease-specific sources
How often the donor was unrelated
Not reported. No source we could read states this for this condition, so we do not give a number. An estimate here would be a guess dressed as evidence.

Where this gets complicated

Evidence remains Class IV and cohorts are small; response is not uniform and selection by antibody/phenotype is unsettled.; The spectrum includes classic SPS, variants, and PERM with different biology and urgency; these should not be assumed equivalent.; IVIg and symptomatic therapy have broader established use, while transplant adds infertility, infection, secondary-autoimmunity, and conditioning risks.

Written for transplant clinicians, not for patients. We quote it so you can see what the guidance actually says:
“for a subset of people with SPSD, autologous nonmyeloablative HSCT improves outcomes.”

It describes what teams consider in general. It cannot say what applies to any one person. Read the source.

We are not asking you to register on this page

An unrelated donor is not a usual part of treating this condition, so it would be dishonest to use this page to ask you to register. Other conditions in the library are a different story.

Related conditions

Others in autoimmune conditions. They are genuinely different diseases with different treatments — the group name is not a diagnosis.

Where this came from

Stiff-person spectrum disorder — what it is and how it is treated | Jada Bascom Foundation