PT  - JOURNAL ARTICLE
AU  - Jonathan D. Santoro
AU  - Lauren M. Kerr
AU  - Rachel Codden
AU  - Theron Charles Casper
AU  - Benjamin M. Greenberg
AU  - Emmanuelle Waubant
AU  - Sek Won Kong
AU  - Kenneth D. Mandl
AU  - Mark P. Gorman
TI  - Increased Prevalence of Familial Autoimmune Disease in Children With Opsoclonus-Myoclonus Syndrome
AID  - 10.1212/NXI.0000000000001079
DP  - 2021 Nov 01
TA  - Neurology - Neuroimmunology Neuroinflammation
PG  - e1079
VI  - 8
IP  - 6
4099  - http://nn.neurology.org/content/8/6/e1079.short
4100  - http://nn.neurology.org/content/8/6/e1079.full
SO  - Neurol Neuroimmunol Neuroinflamm2021 Nov 01; 8
AB  - Background and Objectives Opsoclonus-myoclonus syndrome (OMS) is a rare autoimmune disorder associated with neuroblastoma in children, although idiopathic and postinfectious etiologies are present in children and adults. Small cohort studies in homogenous populations have revealed elevated rates of autoimmunity in family members of patients with OMS, although no differentiation between paraneoplastic and nonparaneoplastic forms has been performed. The objective of this study was to investigate the prevalence of autoimmune disease in first-degree relatives of pediatric patients with paraneoplastic and nonparaneoplastic OMS.Methods A single-center cohort study of consecutively evaluated children with OMS was performed. Parents of patients were prospectively administered surveys on familial autoimmune disease. Rates of autoimmune disease in first-degree relatives of pediatric patients with OMS were compared using Fisher exact t test and χ2 analysis: (1) between those with and without a paraneoplastic cause and (2) between healthy and disease (pediatric multiple sclerosis [MS]) controls from the United States Pediatric MS Network.Results Thirty-five patients (18 paraneoplastic, median age at onset 19.0 months; 17 idiopathic, median age at onset 25.0 months) and 68 first-degree relatives (median age 41.9 years) were enrolled. One patient developed systemic lupus erythematosus 7 years after OMS onset. Paraneoplastic OMS was associated with a 50% rate of autoimmune disease in a first-degree relative compared with 29% in idiopathic OMS (p = 0.31). The rate of first-degree relative autoimmune disease per OMS case (14/35, 40%) was higher than healthy controls (86/709, 12%; p < 0.001) and children with pediatric MS (101/495, 20%; p = 0.007).Discussion In a cohort of pediatric patients with OMS, there were elevated rates of first-degree relative autoimmune disease, with no difference in rates observed between paraneoplastic and idiopathic etiologies, suggesting an autoimmune genetic contribution to the development of OMS in children.OMS=opsoclonus-myoclonus syndrome; BCH=Boston Children's Hospital; DTaP=diphtheria, tetanus, pertussis; IQR=interquartile range; MMR=measles, mumps, rubella; MS=multiple sclerosis; NPMSC=Network of Pediatric MS Centers