MGMT Gene Promoter Methylation Analysis by Pyrosequencing of Brain Tumour
Korean Journal of Pathology
;
: 455-462, 2011.
Article
in English
| WPRIM
| ID: wpr-71579
ABSTRACT
BACKGROUND:
The aim of this study was to determine whether pyrosequencing (PSQ) might be useful to achieve O6-methyl guanine methyltransferase (MGMT) promoter methylation using 1- to 13-year-old archival tissues as a clinical biomarker in routine practice.METHODS:
The study included 141 formalin-fixed paraffin-embedded (FFPE) glial tumors from the archives of the Pathology Department from 1997-2010.RESULTS:
The average percentage of methylation (MP) of the 141 cases was 14.0+/-16.8%, and methylated cases were 32.3+/-14.9%. The average MP of each year did not show a linear increasing or decreasing pattern according to the age of the FFPE block (p=0.771). The average MP of methylated glioblastomas was 35.8+/-14.7%, 31.8+/-15.5% for anaplastic astrocytomas, and 22.4+/-15.1% for astrocytoma. A tendency was observed toward an increasing pattern of average MP with World Health Organization (WHO) grade (p=0.063) in astrocytic tumors. A correlation was observed between average MP and WHO grade (p=0.038) and a bimodal distribution was observed between the methylated and unmethylated cases, using a 9% cut-off value (p<0.001).CONCLUSIONS:
The results showed that a quantitative approach for MGMT promoter methylation yielded a 100% success rate for FFPE tissues from archives. PSQ can be used in a retrospective trial, but the cut-off value and calculation method should be further validated.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Astrocytoma
/
World Health Organization
/
Brain
/
Retrospective Studies
/
Glioblastoma
/
Glioma
/
Guanine
/
Methylation
Type of study:
Observational study
Limits:
Adolescent
/
Humans
Language:
English
Journal:
Korean Journal of Pathology
Year:
2011
Type:
Article
Similar
MEDLINE
...
LILACS
LIS