Endoscopic and molecular characterization of colorectal sessile serrated adenoma/polyps with cytologic dysplasia.
Gastrointest Endosc
; 86(6): 1131-1138.e4, 2017 Dec.
Article
em En
| MEDLINE
| ID: mdl-28501592
ABSTRACT
BACKGROUND AND AIMS:
Sessile serrated adenoma/polyps (SSA/Ps), which are precursor lesions of colorectal cancer (CRC) with BRAF mutation and the CpG island methylator phenotype (CIMP), develop cytologic dysplasia (CD) during the progression of colorectal tumorigenesis. In the present study we aimed to clarify the endoscopic and molecular signatures of SSA/Ps, with and without CD.METHODS:
A series of 208 serrated lesions, including 41 hyperplastic polyps, 90 SSA/Ps, 33 SSA/Ps with CD, and 44 traditional serrated adenomas, were observed and resected using magnifying endoscopy. BRAF and KRAS mutations and methylation of CIMP markers (MINT1, MINT2, MINT12, MINT31, and p16) were analyzed through pyrosequencing. Molecular alterations were then compared with endoscopic and pathologic characteristics.RESULTS:
Among SSA/Ps without CD, the Type II-Open pit pattern (Type II-O), BRAF mutation, and CIMP were tightly associated with a proximal colon location. SSA/Ps in the distal colon infrequently exhibited Type II-O and CIMP. By contrast, most SSA/Ps with CD showed Type II-O plus adenomatous pit patterns (Type III or IV), BRAF mutation, and CIMP, irrespective of their locations.CONCLUSIONS:
Our results suggest that the Type II-O plus III/IV pit pattern is a common feature of SSA/Ps with CD in both the proximal and distal colon and that this pit pattern is a hallmark of serrated lesions at high risk of developing into CRCs.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Colorretais
/
Adenoma
/
Pólipos do Colo
Limite:
Aged
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Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Gastrointest Endosc
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Japão