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Related Experiment Videos

Phenotypic expression in familial adenomatous polyposis: partial prediction by mutation analysis

K P Nugent1, R K Phillips, S V Hodgson

  • 1St Mark's Hospital, London.

Gut
|November 1, 1994
PubMed
Summary

Familial adenomatous polyposis (FAP) patients with a specific gene mutation (codon 1309 deletion) show significantly more colorectal polyps and a higher incidence of desmoid disease and extracolonic cancers. This highlights a correlation between specific mutations and FAP phenotype variability.

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Area of Science:

  • Genetics
  • Gastroenterology
  • Oncology

Background:

  • Familial adenomatous polyposis (FAP) exhibits variable clinical manifestations.
  • Understanding genotype-phenotype correlations in FAP is crucial for patient management.

Purpose of the Study:

  • To compare the phenotype of FAP patients with a specific 5 base pair deletion at codon 1309 against matched controls and patients with other mutations.
  • To investigate the association between specific germline mutations and the number of colorectal polyps, desmoid disease, and extracolonic cancers in FAP.

Main Methods:

  • Retrospective analysis of 27 FAP patients with a codon 1309 deletion.
  • Comparison with 61 matched FAP controls and 24 patients with other FAP-associated mutations.
  • Statistical analysis of polyp burden, desmoid disease, and extracolonic cancer incidence.

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Main Results:

  • Patients with the codon 1309 deletion had significantly more colorectal polyps (median 4000) than controls (median 600) (p = 0.0001).
  • Mutations at codons 1323, 1407, and 233 were also linked to a high polyp burden.
  • Desmoid disease and extracolonic cancers were more frequent in patients with the codon 1309 mutation (p = 0.003).

Conclusions:

  • A specific germline mutation (codon 1309 deletion) is strongly correlated with an increased number of large bowel polyps in FAP.
  • While specific mutations influence phenotype, residual heterogeneity suggests contributions from other genetic, environmental, or stochastic factors.