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Retinoblastoma
Retinoblastoma is a malignant tumor of the developing retina that occurs in children, usually before age five years. Retinoblastoma develops from cells that have cancer-predisposing variants in both copies of RB1. Retinoblastoma may be unifocal or multifocal. About 60% of affected individuals have unilateral retinoblastoma with a mean age of diagnosis of 24 months; about 40% have bilateral retinoblastoma with a mean age of diagnosis of 15 months. Heritable retinoblastoma is an autosomal dominant susceptibility for retinoblastoma. Individuals with heritable retinoblastoma are also at increased risk of developing non-ocular tumors. [from GeneReviews]
Neu-Laxova syndrome
Neu-Laxova syndrome is an autosomal recessive lethal multiple malformation syndrome characterized by ichthyosis, marked intrauterine growth restriction, microcephaly, short neck, central nervous system anomalies (lissencephaly, cerebellar hypoplasia and/or abnormal/agenesis of the corpus callosum), limb deformities, hypoplastic lungs, edema, and abnormal facial features including severe proptosis with ectropion, hypertelorism, micrognathia, flattened nose, and malformed ears (summary by Manning et al., 2004). Genetic Heterogeneity of Neu-Laxova Syndrome NLS2 (616038) is caused by mutation in the PSAT1 gene (610936) on chromosome 9q21. [from OMIM]
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