Methylation of O6-methylguanine-DNA methyltransferase (MGMT) promoter gene in triple-negative breast cancer patients

被引：30

作者：

Fumagalli, Caterina ^{[2
]}

Pruneri, Giancarlo ^{[1
,2
]}

Possanzini, Paola ^{[2
]}

Manzotti, Michela ^{[2
]}

Barile, Monica ^{[3
]}

Feroce, Irene ^{[3
]}

Colleoni, Marco ^{[4
]}

Bonanni, Bernardo ^{[3
]}

Maisonneuve, Patrick ^{[5
]}

Radice, Paolo ^{[6
,7
]}

Viale, Giuseppe ^{[1
,2
]}

Barberis, Massimo ^{[2
]}

机构：

[1] Univ Milan, Sch Med, Milan, Italy

[2] European Inst Oncol, Div Pathol, I-20141 Milan, Italy

[3] European Inst Oncol, Div Canc Prevent & Genet, I-20141 Milan, Italy

[4] European Inst Oncol, Res Unit Med Senol, Dept Med, I-20141 Milan, Italy

[5] European Inst Oncol, Dept Epidemiol & Biostat, I-20141 Milan, Italy

[6] Fdn IRCCS Ist Nazl Tumori, Unit Mol Bases Genet Risk & Genet Testing, Dept Prevent & Predict Med, Milan, Italy

[7] IFOM Fdn Ist FIRC Oncol Mol, Milan, Italy

来源：

BREAST CANCER RESEARCH AND TREATMENT | 2012年 / 134卷 / 01期

关键词：

Triple negative breast cancer; MGMT; BRCA1; DNA-REPAIR; PROGNOSTIC-SIGNIFICANCE; PROGESTERONE-RECEPTORS; THERAPEUTIC STRATEGIES; MOLECULAR PORTRAITS; RANDOMIZED-TRIAL; PREDICTIVE-VALUE; TEMOZOLOMIDE; HYPERMETHYLATION; TUMORS;

D O I：

10.1007/s10549-011-1945-9

中图分类号：

R73 [肿瘤学];

学科分类号：

100214 ;

摘要：

Triple-negative breast cancers are characterized by the triple-negative (ER/PgR/Her2 negative) phenotype, are frequently associated with BRCA gene mutation, and are not candidate to currently available endocrine and HER2-targeted treatments. MGMT is involved in direct DNA repair exerted by cleavage of mutagenic alkyl adducts within DNA, and its epigenetic silencing confers susceptibility to DNA-damaging alkylating agents in glioblastomas and melanomas. MGMT methylation status has not been extensively investigated in breast cancer patients. The goal of our study was to evaluate the MGMT methylation status in TNBC patients, for most of which BRCA1 and BRCA2 mutational status was known. We evaluated MGMT methylation status by methylation-specific PCR (MSP) in formalin-fixed and paraffin-embedded tumor specimens from 92 TNBC patients. By using the GelDoc system (Biorad) software, the cases were further classified as follows: 0 (absence of methylated signal), 1 (prevalence of unmethylated signal, U/M ratio > 1), 2 (prevalence of methylated signal, U/M ratio < 1), and 3 (absence of unmethylated signal). MSP products were obtained in 89 (96.7%) of the cases. Overall, 15 (16.9%) cases were classified as 0, 33 (37.1%) cases as 1, 39 (43.8%) cases as 2, and 2 (2.2%) cases as 3. The 48 cases classified as 0 and 1 were considered as MGMT unmethylated, and the 41 cases classified as 2 and 3 as MGMT methylated. The prevalence of MGMT methylation in patients with BRCA1 mutated, wild-type, and unknown was 30.2% (13/43), 63.6% (14/22), and 58.3% (14/24), respectively. MGMT methylation was unrelated to the main clinical pathological characteristics, with the exception of a weak association with advanced age. In conclusion, our data suggest that in TNBC with wild-type BRCA1, the direct DNA repair system may be frequently (63.6%) silenced by MGMT methylation. The evaluation of the MGMT status could offer a new adjunct in predicting tumor response to alkylating drugs in TNBC patients.

引用

页码：131 / 137

页数：7

共 48 条

[1] Defective Repair of Oxidative DNA Damage in Triple-Negative Breast Cancer Confers Sensitivity to Inhibition of Poly(ADP-Ribose) Polymerase [J].