Stiff person syndrome does not always occur with maternal passive transfer of GAD65 antibodies.

The authors report the presence of high titer antibodies to glutamic acid decarboxylase (anti-GAD65) until age 24 months in two asymptomatic newborns of a woman with stiff-person syndrome (SPS). No signs of SPS were detectable in the two children at ages 6 and 8 years. This observation indicates that other cofactors are involved in the pathogenesis of SPS.