when I saw "Stiff-Person Syndrome" I thought this must be about AS, but it's another immune disorder, I've never heard of it before, pity we didn't think of that name first!!
Study Shows Negative Results of Rituximab in Patients With Stiff-Person Syndrome: Presented at ANA

By Crina Frincu-Mallos, PhD

BALTIMORE, Md -- October 15, 2009 -- In contrast to promising results in other autoimmune disorders, rituximab is ineffective in treating stiff-person syndrome (SPS), an immune-mediated disorder characterised by rigidity of limb muscles and spasms...........