Effects of 5-Aza-CdR on the Proliferation of Human Breast Cancer Cell Line MCF-7 and on the Expression of Apaf-1 Gene

Hypermethylation in the promoter region of tumor suppressor genes is a common mechanism of gene silencing, which tends to occur in cancer. The effects of 5-Aza-2＇-deoxycytidine （5-Aza-CdR）, a specific DNA methyltransferase inhibitor, on the cell proliferation of human breast cancer cell line MCF-7 and on the expression of Apaf-1 gene were investigated. Human MCF-7 cells were incubated with increasing concentrations of 5-Aza-CdR for 12 to 120 h. The growth inhibition rates of MCF-7 cells were detected by MTT assay. Changes of cell cycle distribution and apoptotic rates of MCF-7 cells were determined by flow cytometry. The expressions of DNA methyltransferase 3b mRNA and Apaf-1 mRNA were measured by reverse transcription polymerase chain reaction （RT-PCR）. Meanwhile, the expression of Apaf-1 protein was detected by Western blotting. The results showed that 5-Aza-CdR significantly inhibited the growth of MCF-7 cells and the growth inhibition rate of MCF-7 cells was significantly enhanced with the concentration of 5-Aza-CdR and the action time. Flow cytometry indicated that 5-Aza-CdR could significantly induce G1/S cell cycle arrest and increase the apoptosis rate of MCF-7 cells. The mRNA and protein expressions of Apaf-1 were up-regulated in MCF-7 cells treated with 5-Aza-CdR, which was accompanied by down-regulation of DNA methyltransferase 3b mRNA. It is concluded that 5-Aza-CdR might retard the growth of tumor ceils and promote the apoptosis of MCF-7 breast cancer cells by inhibiting the expression of DNA methyltransferase 3b and re-activating the Apaf-1 gene expression.

Targeted inhibition of Notch1 gene enhances the killing effects of Paclitaxel on triple-negative breast cancer cells

Objective:To study the influence of targeted inhibition of Notch1 gene on the killing effects of Paclitaxel on triple-negative breast cancer cells.Methods:The triple-negative [estrogen receptor(ER)/progesterone receptor(PR)/human epidermal growth factor receptor 2(Her2)] breast cancer cell line MDA-MB-231 and ER/PR/HER-2-positive breast cancer cell line MCF-7 were cultured,transfected with Notch1-si RNA-overexpression plasmid and blank plasmid,and treated with different concentrations of paclitaxel,and then the cell proliferation activity and apoptosis rate as well as the m RNA expression of Caspase-3,Caspase-9 and Bcl-2 were determined.Results:Paclitaxel could decrease the MDA-MB-231 and MCF-7 cell proliferation activity as well as Bcl-2 mRNA expression,and increase MDA-MB-231 and MCF-7 cell apoptosis rate as well as Caspase-3 and Caspase-9 mRNA expression in dosedependent manners;with the same dose of paclitaxel treatment,the inhibitory effects on MDAMB-231 cell proliferation activity and Bcl-2 m RNA expression as well as the promoting effects on MDA-MB-231 cell apoptosis and mR NA expression of Caspase-3 and Caspase-9 were weaker than those on MCF-7 cell;after 0.5 μM paclitaxel combined with Notch1-siRNA treatment,MDA-MB-231 cell proliferation activity and Bcl-2 mRNA expression were significantly lower than those after 0.5 μM paclitaxel combined with control plasmid treatment while cell apoptosis rate and mR NA expression of Caspase-3 and Caspase-9 were higher than those after 0.5 μM paclitaxel combined with control plasmid treatment.Conclusions:Targeted inhibition of Notch1 gene may enhance the killing effects of paclitaxel on triple-negative breast cancer cells by up-regulating the expression of Caspase-3 and Caspase-9 and inhibiting the expression of Bcl-2.

The cancer-testis gene,MEIOB,sensitizes triple-negative breast cancer to PARP1 inhibitors by inducing homologous recombination deficiency

Objective:The newly defined cancer-testis(CT)gene,MEIOB,was previously found to play key roles in DNA double-strand break(DSB)repair.In this study,we aimed to investigate the effects and mechanisms of MEIOB in the carcinogenesis of triple-negative breast cancers(TNBCs).Methods:The Cancer Genome Atlas database was used to quantify the expression of MEIOB.Cox regression analysis was used to evaluate the association between MEIOB expression and the prognosis of human TNBC.The effects of MEIOB on cell proliferation and migration in TNBCs were also assessed in vitro.Patient-derived xenograft(PDX)models were used to assess the sensitivity of breast cancers with active MEIOB to PARP1 inhibitors.Results:We confirmed MEIOB as a CT gene whose expression was restricted to the testes and breast tumors,especially TNBCs.Its activation was significantly associated with poor survival in breast cancer patients[overall,hazard ratio(HR)=1.90(1.16–2.06);TNBCs:HR=7.05(1.16–41.80)].In addition,we found that MEIOB was oncogenic and significantly promoted the proliferation of TNBC cells.Further analysis showed that MEIOB participated in DSB repair in TNBCs.However,in contrast to its function in meiosis,it mediated homologous recombination deficiency(HRD)through the activation of poly ADP-ribose polymerase(PARP)1 by interacting with YBX1.Furthermore,activated MEIOB was shown to confer sensitivity to PARP inhibitors,which was confirmed in PDX models.Conclusions:MEIOB played an oncogenic role in TNBC through its involvement in HRD.In addition,dysregulation of MEIOB sensitized TNBC cells to PARP inhibitors,so MEIOB may be a therapeutic target of PARP1 inhibitors in TNBC.

Low Trichorhinophalangeal Syndrome 1 Gene Transcript Levels in Basal-like Breast Cancer Associate with Mesenchymal-to-epithelial Transition

Objective To investigate trichorhinophalangeal syndrome 1 gene （TRPS-1） expression patterns in different subtypes of breast cancer and its correlations with other genes and survival using microarray data sets. Methods The transcripts of TRPS-1 and its role in survival in breast cancer were analyzed using published microarray data sets-Netherlands Cancer Institute （NKI） cohort and Wang cohort.

Detection of Breast Cancer 1 (BRCA1) Gene Using an Electrochemical DNA Biosensor Based on Immobilized ZnO Nanowires

Herein we report an electrochemical DNA biosensor for the rapid detection of sequence (5’ AAT GGA TTT ATC TGC TCT TCG 3’) specific for the breast cancer 1 (BRCA1) gene. The proposed electrochemical genosensor is based on short oligonucleotide DNA probe immobilized onto zinc oxide nanowires (ZnONWs) chemically synthesized onto gold electrode via hydrothermal technique. The morphology studies of the ZnONWs, performed by field emission scanning electron microscopy (FESEM), showed that the ZnO nanowires are uniform, highly dense and oriented perpendicularly to the substrate. Recognition event between the DNA probe and the target was investigated by differential pulse voltammetry (DPV) in 0.1 M acetate buffer solution (ABS), pH 7.00;as a result of the hybridization, an oxidation signal was observed at +0.8 V. The influences of pH, target concentration, and non-complimentary DNA on biosensor performance were examined. The proposed DNA biosensor has the ability to detect the target sequence in the range of concentration between 10.0 and 100.0 μM with a detection limit of 3.32 μM. The experimental results demonstrated that the prepared ZnONWs/Au electrodes are suitable platform for the immobilization of DNA.

BRCA1、BRCA2在上皮性卵巢癌中的表达及与预后的关系

目的 探讨乳腺癌易感基因1(BRCA1)、乳腺癌易感基因2(BRCA2)在上皮性卵巢癌(EOC)中的表达水平,并分析其与预后的关系。方法 选取2019年1月—2023年6月南通市肿瘤医院收治的98例EOC患者,采集术中切除的新鲜癌组织和癌旁组织,采用实时定量聚合酶链反应(qRT-PCR)检测组织中BRCA1、BRCA2 mRNA表达情况,分析其与临床病理特征的关系,并以Kaplan-Meier生存曲线和Cox回归模型分析其对EOC患者总生存期(OS)和无进展生存期(PFS)的影响。结果 EOC组织BRCA1、BRCA2 mRNA表达量、蛋白相对表达量均低于癌旁组织(P<0.05)。腹腔积液量≥500 mL、国际妇产科学联合会(FIGO)分期Ⅲ—Ⅳ期、有淋巴结转移患者的BRCA1、BRCA2 mRNA表达低于无腹腔积液和腹腔积液量<500 mL、FIGO分期Ⅰ—Ⅱ期及无淋巴结转移患者(P<0.05)。中位随访时间27(9~50)个月,随访率95.92%(4例失访),随访期间39例(39.80%)复发,26例(26.53%)死亡。Kaplan-Meier生存分析显示,BRCA1、BRCA2 mRNA高表达者累积生存率高于低表达者(P<0.05)。BRCA1、BRCA2 mRNA高表达者累积无进展生存率高于低表达者(P<0.05)。多因素Cox回归分析显示化疗≤6疗程、腹腔积液量≥500 mL、FIGO分期Ⅲ+Ⅳ期及BRCA1、BRCA2 mRNA低表达是影响EOC患者OS的独立危险因素(P<0.05)。术后残灶>2 cm、化疗≤6疗程、腹腔积液量≥500 mL及BRCA1、BRCA2 mRNA低表达是影响EOC患者PFS的独立危险因素(P<0.05)。结论 EOC癌变组织中BRCA1、BRCA2异常低表达,BRCA1、BRCA2 mRNA低表达与患者的临床病理特征关系密切,且影响患者PFS及OS。

Polymorphisms at <i>GSTM </i>1, <i>GSTP </i>1, <i>GSTT </i>1 Detoxification Genes Loci and Risk of Breast Cancer in Kazakhstan Population

Associations of null polymorphism (copy number variation) of detoxification genes GSTM1, GSTT1 and GSTP1 (at rs2495636, 105 Ile/Val) with the breast cancer (BC) were assessed in two main ethnic groups of the Republic of Kazakhstan (Kazakhs and Russians). Total number of patients was 181, and of controls 397. Statistically significant difference was observed between BC patients and healthy individuals in alleles frequency (χ2 = 4.89, р = 0.007) of GSTP1 gene at rs2495636 (105 Ile/Val) among the Kazakhs ethnic group. Difference in genotypes distribution (χ2 =5.26, р = 0.076) at this site is approximating to be statistically significant. In the Russian group, no differences were found in genotypes and alleles atrs 2495636 of GSTP1 gene between cases and controls. There was no significant difference between null polymorphism (copy number variation) of GSTM1 and GSTT1 genes among cases and controls in both ethnic groups.

Clinical significance of breast cancer susceptibility gene 1 expression in resected non-small cell lung cancer:A meta-analysis

BACKGROUND The clinical significance of breast cancer susceptibility gene 1(BRCA1)in nonsmall cell lung cancer(NSCLC)patients undergoing surgery remains unclear up to now.AIM To explore the relation of BRCA1 expression with clinicopathological characteristics and survival in patients with resected NSCLC.METHODS EMBASE,PubMed,Web of Science,and The Cochrane Library databases were searched to identify the relevant articles.To assess the correlation between the expression of BRCA1 and clinicopathological characteristics and prognosis of patients with resected NSCLC patients,the combined relative risks or hazard ratios(HRs)with their corresponding 95%confidence intervals[CIs]were estimated.RESULTS Totally,11 articles involving 1041 patients were included in the meta-analysis.The results indicated that the expression of BRCA1 was significantly correlated with prognosis of resected NSCLC.Positive BRCA1 expression signified a shorter overall survival(HR=1.60,95%CI:1.25-2.05;P<0.001)and disease-free survival(HR=1.78,95%CI:1.42-2.23;P<0.001).However,no significant association of BRCA1 expression with any clinicopathological parameters was observed.CONCLUSION BRCA1 expression indicates a poor prognosis in resected NSCLC patients.BRCA1 might serve as an independent biomarker to predict clinical outcomes and help to customize optimal adjuvant chemotherapy for NSCLC patients who had received surgical therapy.

Associations of Polymorphisms of the <i>CYP</i>1<i>A</i>1 and <i>CYP</i>1<i>B</i>1 Cytochrome P450 Genes with Breast Cancer in Kazakhstan

Associations of polymorphisms in rs4646903 site of CYP1A1 and rs1056836 site of CYP1B1 genes with the breast cancer (BC) were studied in two main ethnic groups of Kazakhstan Republic (Kazakhs and Russians). Total number of BC patients was 181, controls—397. The statistically significant differences were revealed in allele frequencies (χ2 = 5.93, р = 0.004) and in genotypes distribution (χ2 = 8.71, р = 0.015) in rs4646903 site of CYP1A1 gene in Kazakh but not in Russian group. The study of CYP1В1 rs1056836 site demonstrated differences in genotype distributions (χ2 = 7.48, р = 0.023) between BC patients and controls in Russian but not in Kazakh ethnic group.

Association among Serum Organochlorine Pesticide Residues, Glutathione S-Transferase M1 Genetic Polymorphism and Female Breast Cancer

Background: The purpose of this study was to evaluate the association among serum organochlorine pesticide residues, glutathione S-transferase M1 genetic polymorphism and female breast cancer. Methods: A 1:1 matched case-control study of 140 newly diagnosed breast cancer patients and 140 non-cancer female patients who consulted the five largest hospitals in the Tangshan city from September 2006 to October 2007. Results: The result showed higher risk of breast cancer among subjects with higher levels of serum DDT and HCH residue, the OR was 3.18 (95%CI, 1.11 - 9.07) and 5.02 (95%CI, 1.64 - 16.56).The value of ORe associated with single environmental factor DDT high residues, and ORg associated with single GSTM1 deletion genotype were respectively 3.86 (1.20 - 12.47) and 1.34 (0.36 - 5.08). The OReg associated with combined action of two factors was 5.59 (1.63 - 18.90), and the value of interaction parameters (γ) equaled 1.24. The value of ORe associated with single environmental factor HCH higher residue and ORg associated with single GSTM1 deletion genotype were respectively 2.73 (0.84 - 8.87) and 1.48 (0.49 - 4.60). The value of OReg associated with combined action of two factors was 3.87 (1.18 - 12.68), and γ equaled 1.38. Conclusion: The results indicated that breast cancer occurrence was the combined result of environmental and genetic factors. The concurrent action of GSTM1 deletion genotype and DDT/HCH enhanced the risk of breast cancer.

食管鳞癌组织中BARD1的表达及与淋巴结转移的关系

目的分析食管鳞癌(ESCC)中乳腺癌易感基因1相关环指结构域蛋白1(BARD1)的表达及与淋巴结转移的关系。方法纳入2018年1月至2021年12月本院收治且经组织病理学检查确诊的114例ESCC患者,免疫组化EnVision两步法检测癌组织与癌旁组织中BARD1的表达情况并比较BARD1阳性率,分析BARD1表达与ESCC临床病理特征的关系,建立Logistic回归模型分析BARD1表达对ESCC淋巴结转移的影响,绘制受试者工作特征(ROC)曲线分析BARD1表达对ES⁃CC淋巴结转移的预测价值。结果114例ESCC组织中BARD1阳性78例、阴性36例,对应癌旁组织中BARD1阳性23例、阴性91例,ESCC组织的BARD1阳性率为68.42%,高于癌旁组织的20.18%(χ^(2)=53.769,P<0.001)。BARD1表达与ESCC患者的T分期、分化程度和淋巴结转移有关(P<0.05),其中淋巴结转移组织的BARD1阳性率为80.36%(45/56),高于未转移组织的56.90%(33/58)。经Phi系数分析发现,BARD1表达与ESCC淋巴结转移呈正相关(r=0.276,P=0.003)。BARD1阳性是ESCC患者淋巴结转移的独立危险因素(OR=3.099,95%CI:1.339~7.175,P=0.008),且BARD1表达对ESCC患者淋巴结转移具有一定预测价值(AUC=0.636,P=0.020)。结论BARD1在ESCC中高表达,其与ESCC淋巴结转移密切相关,BARD1阳性会增加淋巴结转移风险,在评估ESCC淋巴结转移上有一定价值。

The Role of HER2/Neu and BRCA1 Genes in the Diagnosis of Breast Cancer among Sudanese Women

Background: Knowledge of HER2/Neu and BRCA1 Genes might be helpful for development of strategies for decreasing the burden of risk of breast cancer. Therefore, the aim of this study to detect the role of HER2/Neu and BRCA1 Genes expression in diagnosis of breast cancer in Sudanese women. Methodology: A total of 100 tissue samples obtained from patients with breast cancer in addition to 50 tissue samples obtained from patients with benign breast lesions, were detected the expression of HER2/Neu and BRCA1 Genes by Polymerase Chain Reaction (PCR). Results: The prevalence of HER2/Neu and BRCA1 Genes, among cases was 6%, and 10% respectively. Conclusion: HER2/Neu and BRCA1 Genes have a considerable contribution to etiology of breast cancer in Sudan that requires further consideration.

Correlation of Kif2a and HPK1 expression in breast cancer with the oncogene and drug resistance gene expression

Objective: To investigate the correlation of Kif2a and HPK1 expression in breast cancer with the oncogene and drug resistance gene expression. Methods: A total of 91 patients with breast cancer and 85 patients with breast adenoma who accepted surgical treatment in our hospital between August 2016 and February 2018 were selected, and the breast cancer tissues and breast adenoma tissues were collected respectively as the research samples. Fluorescence quantitative PCR method was used to detect the expression of Kif2a and HPK1 genes as well as oncogenes and drug resistance genes in sample tissues, and Pearson test was used to evaluate the inner link of Kif2a and HPK1 gene expression in breast cancer tissue with oncogene and drug resistance gene expression. Results: Kif2a mRNA expression in breast cancer tissues was higher than that in breast adenoma tissues whereas HPK1 mRNA expression was lower than that in breast adenoma tissues;oncogenes DEK, iASPP-SV, Stat3, MDM2 and Fra-1 mRNA expression were higher than those in breast adenoma tissues;drug resistance genes ESR1, MDR1, P-gp, MRP1 and GST- mRNA expression were higher than those in breast adenoma tissues whereas BCRP mRNA expression was lower than that in breast adenoma tissues. Correlation analysis showed that the Kif2a and HPK1 gene expression in breast cancer tissues were directly correlated with the expression of oncogenes and drug resistance genes. Conclusion: Kif2a gene is abnormally highly expressed whereas HPK1 gene is abnormally lowly expressed in breast cancer tissues, and they are involved in the regulation of oncogene and drug resistance gene expression.

组蛋白H2A去泛素化酶BAP1对恶性胶质瘤细胞发生发展的作用及临床应用价值研究

目的探索乳腺癌/卵巢癌易感基因1相关蛋白1(breast/ovarian cancer susceptibility gene 1 associated protein 1,BAP1)对人源恶性胶质瘤发生、发展的作用与BAP1作为恶性胶质瘤临床诊断标志物的可行性。方法基于基因表达综合数据库(gene expression omnibus,GEO)的子数据集GSE4290,GSE90598,分析BAP1在正常组织及胶质瘤组织中的差异性表达情况;受试者工作特征(receiver operating characteristic,ROC)曲线分析BAP1对恶性胶质瘤的早期诊断价值;选取自主收集的非配对28例恶性胶质瘤患者的原发灶组织、5例颅脑外伤患者内减压术切除的非瘤脑组织,采用实时荧光定量PCR(quantitative real-time polymerase chain reaction,qRT-PCR)检测BAP1的表达水平;利用靶向BAP1的特异性小干扰RNAs(small interfering RNAs,siRNAs)瞬时转染U251细胞系,进一步检测其干涉效率;基于流式细胞仪分析BAP1下调的U251细胞系,其细胞周期、凋亡的变化情况。结果生物信息学结果显示,BAP1在恶性胶质瘤组织中的表达水平均低于正常脑组织(GSE4290:1209±18.49 vs 1476±53.90;GSE90598:5.19±0.10 vs 5.65±0.21),差异具有统计学意义(t=5.115,2.267,均P<0.05)。ROC曲线显示,BAP1可高效区分恶性胶质瘤组织与正常脑组织(GSE4290:AUC=0.78;GSE90598:AUC=0.75,均P<0.05)。临床标本结果显示,BAP1在恶性胶质瘤原发灶组织中的表达水平显著低于非瘤脑组织(0.27±0.04 vs 1.06±0.07),差异具有统计学意义(t=10.22,P<0.001)。在U251细胞系中下调BAP1的表达,其细胞周期中S期细胞比例明显增多,由17.59%分别增至27.21%(siBAP1-1)和25.79%(siBAP1-2),差异具有统计学意义(t=6.576,6.642,均P<0.01),而细胞凋亡水平则有所下降,由10.17%分别降至2.70%(siBAP-1)和3.00%(siBAP-2),差异具有统计学意义(t=10.31,9.428,均P<0.01)。结论组蛋白H2A去泛素化酶BAP1能够通过抑制恶性胶质瘤细胞周期快速进展并促进其凋亡,进而发挥肿瘤抑癌基因的功能,可作为潜在的恶性胶质瘤临床诊断标志物。

不同临床病理特征卵巢浆液性肿瘤患者E-cadherin、BRCA1及P53的表达变化研究

目的:探究不同卵巢浆液性肿瘤中E-钙黏蛋白(E-cadherin)、乳腺癌易感基因1(BRCA1)、P53的表达变化情况。方法:选取2017年12月—2022年2月赣州市妇幼保健院的50例卵巢浆液性癌患者为A组,同时期的40例卵巢交界性浆液性肿瘤患者为B组,30例卵巢良性浆液性囊腺瘤患者为C组。检测及比较三组的组织E-cadherin、BRCA1、P53表达情况,并比较A组中不同年龄、淋巴结转移情况、FIGO分期及不同病理分级者的检测结果。结果:A组的E-cadherin及BRCA1阳性率显著均低于B组及C组,B组则显著均低于C组(P<0.05);A组P53阳性率显著高于B组及C组,B组则显著高于C组(P<0.05)。A组中低级别浆液性癌者E-cadherin和BRCA1阳性率均高于高级别浆液性癌者,低级别浆液性癌者P53阳性率显著低于高级别浆液性癌者,差异均有统计学意义(P<0.05)。A组中不同年龄及FIGO分期者的组织E-cadherin、BRCA1及P53阳性率比较,差异均无统计学意义(P>0.05)。A组有淋巴结转移者E-cadherin和BRCA1阳性率均低于无淋巴结转移者,有淋巴结转移者P53阳性率高于无淋巴结转移者,差异均有统计学意义(P<0.05)。结论:卵巢浆液性癌患者中E-cadherin及BRCA1呈低表达,而P53呈高表达,且不同临床病理情况者存在差异,因此在卵巢浆液性癌的早期筛查检测中有一定的参考价值。

遗传性卵巢癌中乳腺癌抑制蛋白1/2和错配修复蛋白MutS同源物2基因突变的意义研究

目的研究遗传性卵巢癌中乳腺癌抑制蛋白1/2(BRCA1/2)和错配修复蛋白MutS同源物2(MSH2)基因突变意义。方法选取2019年6月至2023年6月于新余市人民医院就诊的13例家族遗传性卵巢癌患者及家系中5名Ⅰ代健康亲属、20名Ⅱ/Ⅲ代健康亲属作为研究对象。采集所有研究对象空腹静脉血5 ml,分离提取DNA行聚合酶链式反应扩增后直接测序比对,研究遗传性卵巢癌家族中有意义的错义突变基因。结果13例家族遗传性卵巢癌患者临床分期以Ⅲ期、组织分级以低-中分化、有淋巴结肿转移为主。13例患者基因测序显示,BRCA1基因发现突变6处中,无意义突变3处,新发现突变3处。新发现3处突变中3780A>G、5069A>G造成氨基酸变化,3326A>T突变造成Arg突变成终止密码子,共同存在突变为3326A>T。BRCA2基因测序检测出突变6处,无意义突变5处,其中共同存在突变为1342A>C。MSH2基因测序发现无意义突变2处。健康家系中,携带BRCA1基因3326A>T突变3例(12.00%),携带BRCA2基因1342A>C突变12例(48.00%),其余女性测序结果正常。结论BRCA1基因杂合突变3326A>T和BRCA2基因杂合突变1342A>C是遗传性卵巢癌家族发病的致病基因,可为临床早发现、早诊断、早治疗提供指导。

乳腺癌患者肿瘤转移相关基因1表达与化疗敏感性及预后的相关性

目的研究乳腺癌患者肿瘤转移相关基因1(MTA1)表达与化疗敏感性及预后的相关性。方法选取92例接受乳腺癌根治术的患者作为研究对象,根据患者术后化疗结果分为敏感组和抵抗组,比较2组患者的MTA1表达水平以及相关病理参数,采用logistic回归分析影响患者化疗敏感性的因素,同时根据随访结果分析MTA1表达水平与患者预后的相关性。结果92例化疗患者中敏感组患者共53例,抵抗组共39例。敏感组患者MTA1高表达率低于抵抗组(P<0.05)。敏感组患者中年龄<55岁、KPS评分≥80分、肿瘤分期Ⅰ/Ⅱ期患者占比高于抵抗组(P<0.05)。Logistic回归分析结果显示年龄≥55岁、Karnofsky功能状态评分(KPS)<80分、肿瘤分期Ⅲ期以及MTA1高表达状态均是影响化疗敏感性的高危因素(P<0.05)。MTA1高表达组中位PFS为8个月以及中位OS为13个月,低表达组的中位PFS为12个月以及中位OS为16.5个月,差异比较具有统计学意义(P<0.05)。结论乳腺癌患者MTA1表达与化疗效果有关,其高表达提示化疗不敏感和预后不良,可能成为预测患者预后的重要指标。

Relationship between CYP1A1 polymorphisms and invasion and metastasis of breast cancer

Objective:To investigate the relationship between CYPIA1 genetic polymorphisms and the invasion and metastasis of breast cancer.Methods:The CYP1A1 gene polymorphism(an T-C transversion at nucleotide position 3801)was detected by the polymerase chain reaction and restriction fragment length polymorphism in 80 cases with breast cancer and 60 samples of normal breast tissue.The difference in genotypic distribution frequency between the groups,the correlation between the genotypes and the factors related to prognosis were analyzed.Results:The incidence of homozygous and variant genotypes had no difference between the breast cancer group and controls group(P=0.746).The proportion of variant genotype increased as clinical stage(P=0.006)advanced,as well as with increased numbers of lymph node metastases(P=0.010).Conclusions:In patients with breast cancer there is a correlation between the CYP1A1 CC allele and some factors indicating poor prognosis,including more lymph node metastases as well as a more advanced clinical stage.

Research progress on the relationship between BRCA1 and hereditary breast cancer

Breast cancer gene 1(BRCA1) gene was the first breast cancel susceptibility gene discovered in familial breast cancer.It has been revealed that BRCA1 can be combined with an array of important protein involved in cell cycle regulation,DNA repair,gene transcription control and apoptosis regulation.It plays a down-regulation effect on tumor growth and an important role in maintaining genomic stability.New research suggests that it also associate with the breast cancer stem cells and microRNA.Its mutations,promoter methylation and ectopic expression may one of the main reasons for the generation and development of hereditary breast cancer.

Detection of Copy Number Alteration of MTA1 in Human Breast Cancer

OBJECTIVE The purpose of our study was to investigate the expression level of MTA1 mRNA in breast cancer and its significance in relation to clinical pathology. METHODS The expression levels of MTA1 mRNA in tumor and in paired normal adjacent tissue of 56 cases with breast cancer were detected by fluorescent quantitative polymerase chain reaction. RESULTS The expression of MTA1 mRNA was detected in 47 tumor specimens of 56 breast cancer patients （83.9%） and was significantly higher than in the paired normal breast tissue. The over expressed MTA1 mRNA was significantly associated with pathologic stage （P = 0.029）, clinical grade （P = 0.035） and lymph node status （P = 0.001）. CONCLUSION The over expression of MTA1 mRNA may play a crucial role in the development of breast cancer. As the MTA1 was comparatively highly-expressed in breast cancer, it may become a new biomarker for the diagnosis and treatment of breast cancer in the future.