Sessile Serrated Polyps are Precursors of Colon Carcinomas With Deficient DNA Mismatch Repair.
Clin Gastroenterol Hepatol
; 14(7): 1056-9, 2016 07.
Article
em En
| MEDLINE
| ID: mdl-26898652
ABSTRACT
We investigated whether sessile serrated adenomas/polyps (SSA/Ps) are direct precursors of colorectal carcinomas. We identified colon carcinomas that arose from SSA/Ps among 2646 colorectal cancers included in the surgical pathology database at the Mayo Clinic (2006-2012). Molecular features of the serrated neoplasia pathway were analyzed in these tumors by immunohistochemical analyses of mutant BRAF (V600E) and MLH1 proteins. Among the 33 identified SSA/P-associated colonic adenocarcinomas (median patient age, 75 y), 24 developed in women (73%), 31 were located in the proximal colon (94%), and 23 (69%) were TNM stage I or II. Thirty-one of the tumors (94%) expressed mutant BRAF; of these, 26 also had loss of MLH1 (79%), indicating deficient DNA mismatch repair of sporadic origin. Twenty-two of the tumors (67%) were interval cancers that were more common in women and did not differ significantly in TNM stage, BRAF mutation, or loss of MLH1. By histopathology, SSA/Ps that were associated with colon carcinomas contained frequent dysplasia (48%). Most cancers that arose from SSA/Ps were located on the right side of the colon and had mutant BRAF and loss of MLH1. These findings indicate that SSA/Ps are precursors of most sporadic colon carcinomas with deficient DNA mismatch repair.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pólipos
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Carcinoma
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Neoplasias do Colo
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Enzimas Reparadoras do DNA
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Reparo de Erro de Pareamento de DNA
Tipo de estudo:
Etiology_studies
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Incidence_studies
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Clin Gastroenterol Hepatol
Assunto da revista:
GASTROENTEROLOGIA
Ano de publicação:
2016
Tipo de documento:
Article