tailieunhanh - Hypermethylation at CpG islands of GSTP1 gene’s promoter is the typical property of breast cancer in Vietnamese population

The results showed that 41 of 95 ( %) breast cancer specimens are hypermethylated, no methylation was found on the noncancerous breast tissue (p | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 18, SOÁ T3- 2015 Hypermethylation at CpG islands of GSTP1 gene’s promoter is the typical property of breast cancer in Vietnamese population Doan Thi Phuong Thao HCM Medicine and Pharmacy University Truong Kim Phuong Lao Duc Thuan Le Huyen Ai Thuy HCM Open University (Received on December 12 th 2014, accepted on August 12 th 2015) ASTRACT The demand for biomarker that applied in prognosis, early diagnosis, predicting and/or monitoring the therapeutic response and detection of recurrent cancer is the worldwide expection. One of the biomarker, which the worldwide researches focused on, is the hypermethylation at CpG island of promoter which undergoes the DNA methylation changes in carcinogenesis. In current study, the target gene is GSTP1 (Glutathion-Stransferase pi 1 gene), with one of the most function is particularly involved in detoxification. Because of this function, GSTP1 (obviously based on the frequencies of methylation) has been chosen as a potential candidate gene for several clinical trials in predicting of the response to the demethylation drugs in several cancers, including breast cancer. In this study, we foscused on the evaluation of the methylation status of 115 biopsy specimens collected from university medical center HCMC, including 95 breast cancer specimens and 20 noncancerous breast tissue. The results showed that 41 of 95 ( %) breast cancer specimens are hypermethylated, no methylation was found on the noncancerous breast tissue (p<). These results allowed us to predict the totally corresponding to the application of the treatment, which based on the demethylation drug, one of the epi-drug line, in Vietnamese patients in the near future. Keywords: GSTP1 (Glutathion-S-transferase pi 1 gene), MSP (Methylation specific PCR), breast cancer, demethylation drug, biomarker. INTRODUCTION Trang 105 Science & Technology Development, Vol 18, 2015 Breast cancer is the most frequent .