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Sporadic pediatric severe familial adenomatous polyposis: A case report.


ABSTRACT: Familial adenomatous polyposis (FAP) is an autosomal dominant hereditary precancerous condition caused by germline pathogenetic variants in the tumor suppressor adenomatous polyposis coli (APC) gene. Patients with FAP develop multiple gastrointestinal adenomatous polyps usually at the age of ~20 years, which, if untreated, become cancerous in 100% of cases. Genotype-phenotype associations have been extensively described; however, inter- and intra-familial variability exists. It is crucial to characterize the causative pathogenetic variant in each pedigree in order to develop a cancer prevention program and follow-up strategy for at-risk families. The present report describes a severe case of sporadic FAP that was diagnosed when the patient was ~2 years old. The patient was a carrier of the de novo pathogenic c.4132 C>T (p.Gln1378X) variant. Additionally, the patient was a carrier of the homozygous c.5465 T>A (p.Asp1822Val) polymorphism, inherited from both parents. However, it remains unclear whether or not this polymorphism is involved in the phenotypic manifestation. This case highlights the need to extend molecular screening to very young children when they show iron-deficiency, anaemia and/or rectal bleeding, even in the absence of a familial history of disease.

SUBMITTER: Cerasuolo A 

PROVIDER: S-EPMC7391832 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Sporadic pediatric severe familial adenomatous polyposis: A case report.

Cerasuolo Andrea A   Miele Erasmo E   Russo Marina M   Aversano Antonietta A   Cammarota Francesca F   Duraturo Francesca F   Liccardo Raffaella R   Izzo Paola P   Rosa Marina De M  

Molecular and clinical oncology 20200713 3


Familial adenomatous polyposis (FAP) is an autosomal dominant hereditary precancerous condition caused by germline pathogenetic variants in the tumor suppressor adenomatous polyposis coli (<i>APC</i>) gene. Patients with FAP develop multiple gastrointestinal adenomatous polyps usually at the age of ~20 years, which, if untreated, become cancerous in 100% of cases. Genotype-phenotype associations have been extensively described; however, inter- and intra-familial variability exists. It is crucial  ...[more]

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