Growth restriction in children with type B Niemann-Pick disease.
OBJECTIVE
To compare growth of children with type B Niemann-Pick disease (NPD) with disease variables including genotype, organomegaly, bone age, and serum insulin-like growth factor-1 (IGF-1).


METHODS
A cross-sectional analysis of growth was performed in 23 children and adolescents with enzymatically and genotypically confirmed NPD. Liver and spleen volumes were measured by quantitative computed tomography and skeletal age by a wrist radiograph.


RESULTS
The mean Z scores for height and weight were -1.24 (29th percentile) and -0.75 (34th percentile). The mean liver and spleen volumes were 2.06 and 13.46 times normal for weight, respectively. Skeletal age was delayed by an average of 2.5 years, and serum IGF-1 level was at or below the 2nd percentile in 8 of 12 patients. Short stature and low weight were significantly correlated with large organ volumes, delayed bone age, and low IGF-1 levels. In contrast to patients with other mutations, individuals homozygous for the DeltaR608 mutation had normal height and weight, markedly less hepatosplenomegaly and bone age delay, and normal IGF-1 levels.


CONCLUSIONS
Abnormal linear growth and delayed skeletal maturation are common in children and adolescents with type B NPD; however, homozygosity for DeltaR608 is associated with normal growth.
Wasserstein
Melissa P
MP
Department of Human Genetics, and the Carl C. Icahn Institute for Gene Therapy and Molecular Medicine, Mount Sinai School of Medicine, New York, New York 10029, USA. Melissa.Wasserstein@mssm.edu
Larkin
Alexandra E
AE
Glass
Ronald B
RB
Schuchman
Edward H
EH
Desnick
Robert J
RJ
McGovern
Margaret M
MM
D000293:Adolescent; D000365:Age Determination by Skeleton; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D005260:Female; D005838:Genotype; D006130:Growth Disorders / Q000097:blood / Q000209:etiology* / Q000235:genetics*; D006529:Hepatomegaly / Q000097:blood / Q000209:etiology / Q000235:genetics; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000032:analysis; D008297:Male; D009542:Niemann-Pick Diseases / Q000097:blood / Q000150:complications* / Q000235:genetics*; D010641:Phenotype; D012720:Severity of Illness Index; D013163:Splenomegaly / Q000097:blood / Q000209:etiology / Q000235:genetics
D007334:Insulin-Like Growth Factor I