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Published in: Journal of Gastroenterology 7/2012

01-07-2012 | Original Article—Alimentary Tract

Juvenile polyposis, hereditary hemorrhagic telangiectasia, and early onset colorectal cancer in patients with SMAD4 mutation

Authors: Frank Schwenter, Marie E. Faughnan, Abigail B. Gradinger, Terri Berk, Robert Gryfe, Aaron Pollett, Zane Cohen, Steven Gallinger, Carol Durno

Published in: Journal of Gastroenterology | Issue 7/2012

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Abstract

Background

Hereditary hemorrhagic telangiectasia (HHT) is an autosomal dominant disorder most often caused by mutation in the endoglin or ALK1 genes. A distinct syndrome combines the clinical features of HHT and juvenile polyposis (JP) and has been associated with SMAD4 mutation. The aim of this study was to describe the phenotype of patients with JP–HHT and SMAD4 mutations and to compare this phenotype with HHT or JP patients with mutations other than SMAD4.

Methods

Patients prospectively enrolled in the Toronto HHT and JP databases who underwent genotyping were included. The phenotypic characteristics of JP–HHT patients with SMAD4 mutations and patients with mutations other than SMAD4 were analyzed and compared.

Results

Three hundred and fifty-eight patients underwent genetic testing (HHT, n = 332; JP, n = 26). Among fourteen patients identified with SMAD4 mutations, ten met the clinical diagnostic criteria for both JP and HHT (71%). Patients with SMAD4 mutations had 100% penetrance of the polyposis phenotype. All patients with JP and SMAD4 mutation had features of HHT. Three JP–HHT patients developed early onset colorectal cancer (CRC) (mean age 28 years). JP–HHT patients with SMAD4 mutation had a significantly higher rate of anemia than HHT patients with mutations other than SMAD4.

Conclusions

Patients with HHT and SMAD4 mutations are at significant risk of JP and CRC. The gastrointestinal phenotype is similar to JP patients without SMAD4 mutation. It is essential for HHT patients to undergo genetic testing to determine if they have SMAD4 mutations so that appropriate gastrointestinal screening and surveillance for JP and CRC can be completed.
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Metadata
Title
Juvenile polyposis, hereditary hemorrhagic telangiectasia, and early onset colorectal cancer in patients with SMAD4 mutation
Authors
Frank Schwenter
Marie E. Faughnan
Abigail B. Gradinger
Terri Berk
Robert Gryfe
Aaron Pollett
Zane Cohen
Steven Gallinger
Carol Durno
Publication date
01-07-2012
Publisher
Springer Japan
Published in
Journal of Gastroenterology / Issue 7/2012
Print ISSN: 0944-1174
Electronic ISSN: 1435-5922
DOI
https://doi.org/10.1007/s00535-012-0545-8

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