|Title:||O(6)-Methylguanine-DNA methyltransferase expression and prognostic value in brain metastases of lung cancers||Authors:||KUAN-TING KUO 郭冠廷
LU-TING KUO 郭律廷
CHIH-HSIN YANG 楊志新
RUEY-MEEI WU 吳瑞美
YONG-KWANG TU 杜永光
SHENG-HONG TSENG 曾勝弘
CHING-HUNG LIN 林季宏
JUI-CHANG TSAI 蔡瑞章
|Keywords:||Brain metastasis; O-6-Methylguanine-DNA methyltransferase; MGMT; Immunohistochemistry||Issue Date:||Jun-2010||Publisher:||ELSEVIER IRELAND LTD||Source:||Lung cancer (Amsterdam, Netherlands)||Journal Volume:||68||Journal Issue:||3||Start page/Pages:||484||Abstract:||
O(6)-Methylguanine-DNA methyltransferase (MGMT) is critical for repairing pro-mutagenic DNA bases and is correlated with response to alkylating agents in cancers. Since there is great interest in pursuing the potential role of temozolomide, a novel alkylating agent, in the treatment of brain metastases, this study aimed to evaluate MGMT expression as well as its prognostic value in this devastating disease. We studied the expression and methylation status of MGMT in 86 brain metastases of lung cancers. Twenty of them had matched primary lung tumor tissues available for direct comparison. MGMT expression was assessed by immunohistochemistry (IHC); the methylation status of MGMT promoter was analyzed by nested methylation-specific PCR (MSP) and validated by quantitative real-time PCR analysis. Positive nuclear MGMT expression was detected more frequently in brain metastases as compared with primary lung cancers (83% versus 50%, P=0.004). The discordance in MGMT expression persisted in the 20 paired primary and metastatic tumors (P=0.031). MGMT promoter hypermethylation was highly correlated with loss of MGMT expression. Both univariate and multivariate analyses showed that median overall survival was significantly longer in patients with positive MGMT expression in brain metastases (16.5 versus 3.5 months, P<0.001). In conclusion, MGMT expression was enhanced in brain metastases as compared with the primary lung cancers. MGMT expression in brain metastases was significantly correlated with better survival.
|Appears in Collections:||醫學系|
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