Integrated Analysis of the Endoscopic, Pathological and Molecular Characteristics of Colorectal Tumorigenesis.
Digestion
; 99(1): 33-38, 2019.
Article
in En
| MEDLINE
| ID: mdl-30554192
ABSTRACT
BACKGROUND:
Colorectal cancers (CRCs) develop through the accumulation of genetic and epigenetic alterations of oncogenes and tumor suppressor genes. In addition to the well-characterized adenoma-carcinoma sequence, the serrated neoplasia pathway is now recognized as an alternative pathway for CRC development.SUMMARY:
Through analysis of the colonoscopic, pathological, and molecular features of colorectal tumors, we identified a novel microsurface structure characteristic of serrated lesions. The Type II-Open (Type II-O) pit pattern is highly specific to sessile serrated adenoma/polyps (SSA/Ps), and Type-II-O-positive tumors frequently exhibit v-raf murine sarcoma viral oncogene homolog B1 (BRAF) mutation and 5'-C-phosphate-G-3' (CpG) island hypermethylation. By screening DNA methylation associated with the development of serrated lesions, we detected methylation of secreted protein acidic and rich in cysteine (SPARC)-related modular calcium binding 1 (SMOC1) in traditional serrated adenomas (TSAs). Epigenetic silencing of SMOC1 is prevalent among TSAs but it is rarely observed in SSA/Ps, which suggests SMOC1 could be a useful diagnostic marker of serrated lesions. We also searched for epigenetic alterations associated with the growth pattern of colorectal tumors and found that methylation of neurotensin receptor 1 is associated with lateral and non-invasive tumor growth. Key Message Through the summarized studies, we have been able to identify novel morphological and molecular features that could contribute to a better understanding of colorectal tumors and to improved clinical diagnosis.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Colorectal Neoplasms
/
Adenoma
/
Carcinogenesis
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Digestion
Year:
2019
Document type:
Article