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Clinical epidemiology of skeletal dysplasias in South America

Authors

  • Cecília O. Barbosa-Buck,

    1. Faculdade de Ciências Médicas, Departamento de Genética Médica, Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo, Brazil
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  • Iêda M. Orioli,

    1. ECLAMC (Estudo Colaborativo Latino Americano de Malformações Congênitas) at Departamento de Genética, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
    2. INAGEMP (Instituto Nacional de Genética Médica Populacional), Rio de Janeiro, Brazil
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  • Maria da Graça Dutra,

    1. INAGEMP (Instituto Nacional de Genética Médica Populacional), Rio de Janeiro, Brazil
    2. ECLAMC (Estudo Colaborativo Latino Americano de Malformações Congênitas) at Laboratório de Epidemiologia de Malformações Congênitas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
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  • Jorge Lopez-Camelo,

    1. INAGEMP (Instituto Nacional de Genética Médica Populacional), Rio de Janeiro, Brazil
    2. ECLAMC (Estudio Colaborativo Latino Americano de Malformaciones Congénitas) at CEMIC (Centro de Educacíon Médica y Investigaciones Clínicas), Buenos Aires, Argentina
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  • Eduardo E. Castilla,

    1. INAGEMP (Instituto Nacional de Genética Médica Populacional), Rio de Janeiro, Brazil
    2. ECLAMC (Estudo Colaborativo Latino Americano de Malformações Congênitas) at Laboratório de Epidemiologia de Malformações Congênitas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Brazil
    3. ECLAMC (Estudio Colaborativo Latino Americano de Malformaciones Congénitas) at CEMIC (Centro de Educacíon Médica y Investigaciones Clínicas), Buenos Aires, Argentina
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  • Denise P. Cavalcanti

    Corresponding author
    1. Faculdade de Ciências Médicas, Departamento de Genética Médica, Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo, Brazil
    • Departamento de Genética Médica, FCM—UNICAMP. R. Tessália Vieira de Camargo, 126, 13083-887, Campinas, São Paulo, Brazil.

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  • How to Cite this Article: Barbosa-Buck CO, Orioli IM, Dutra MG, Lopez-Camelo J, Castilla EE, Cavalcanti DP. 2012. Clinical epidemiology of skeletal dysplasias in South America. Am J Med Genet Part A. 158A:1038–1045.

Abstract

Currently accepted birth prevalence for osteochondrodysplasias (OCD) of about 2/10,000 is based on few studies from small series of cases. We conducted a study based on more than 1.5 million births. OCD cases were detected from 1,544,496 births occurring and examined in 132 hospitals of ECLAMC (Latin American Collaborative Study of Congenital Malformations) between 2000 and 2007. Cases were detected and registered according to a pre-established protocol, and then ranked in four diagnostic evidence levels (DEL), according to available documentation. For the analysis of risk factors, a healthy control sample born in the same period was used. OCD was diagnosed in 492 newborns, resulting in a prevalence per 10,000 of 3.2 (95% CI: 2.9–3.5). Perinatal lethality (stillbirths plus early neonatal deaths) occurred in 50% of cases. Prenatal ultrasound diagnosis was made in 73% of cases (n = 359). Among 211 cases from the best documented group (DEL-1) and according to international classification, 33% of cases fit into the G-25 (osteogenesis imperfecta), 29% in Group-1 (FGFR3), and 8% in Group-18 (Bent bones). The prevalence of the main OCD types were: OI—0.74 (0.61–0.89); thanatophoric dysplasia—0.47 (0.36–0.59); and achondroplasia—0.44 (0.33–0.55). Paternal age (31.2 ± 8.5), parity (2.6), and parental consanguinity rate (5.4%) were higher in cases than in controls (P < 0.001). In conclusion, the OCD overall prevalence of 3.2 per 10,000 found seems to be more realistic than previous estimates. This study also confirmed the high perinatal mortality, and the association with high paternal age, parity, and parental consanguinity rate. © 2012 Wiley Periodicals, Inc.

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