Prognostic value of MGMT methylation in colorectal cancer: a meta-analysis and literature review.
Tumour Biol
; 36(3): 1595-601, 2015 Mar.
Article
em En
| MEDLINE
| ID: mdl-25596081
ABSTRACT
The development of colorectal cancer (CRC) spans about 5-10 years, making early detection and prevention beneficial to the survival of CRC patients. To address inconsistencies in evidence regarding O(6)-methylguanine-DNA-methyltransferase (MGMT) methylation as a potential prognostic factor in CRC, we conducted a meta-analysis to evaluate MGMT methylation in CRC patients. Fourteen studies were included in the meta-analysis after screening 120 articles. The following items were collected from each study author, published year, country, patient gender, MGMT methylation status, and patients' disease progression. Pooled hazard ratios and odd ratios with 95% confidence intervals (CIs) were calculated using fixed or random effect models depending on the heterogeneity between studies. The overall survival of CRC patients was found not to be significantly associated with MGMT methylation. Further subgroup analysis showed that the frequency of MGMT methylation was significantly higher in CRC than in normal tissues (p < 0.00001). MGMT promoter in CRC patients was more frequently methylated than in adenoma patients. In addition, MGMT methylation was significantly increased in adenoma than in normal tissues (p < 0.0001). In conclusion, MGMT methylation is central to the development of cancer that involves a stepwise carcinogenesis of normal adenoma carcinoma cascade. However, MGMT methylation is not associated with the prognosis of CRC.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Colorretais
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Metilases de Modificação do DNA
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Metilação de DNA
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Proteínas Supressoras de Tumor
/
Enzimas Reparadoras do DNA
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
/
Screening_studies
/
Systematic_reviews
Limite:
Humans
Idioma:
En
Revista:
Tumour Biol
Assunto da revista:
NEOPLASIAS
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
China