复发/难治AML患者sorcin基因表达及意义

目的研究复发／难治急性髓细胞白血病（AML）患者骨髓可溶性耐药相关钙结合蛋白（sorcin）基因表达及意义。方法采用逆转录聚合酶链反应（RT—PCR）检测65例AML患者（观察组），27例非白血病患者和健康人（对照组）sorcin基因表达水平。结果观察组sorcin基因表达水平高于对照组（P〈0．001），其中复发／难治者高于初诊者和完全缓解（CR）者；AML各亚型sorcin基因过度表达存在差异，以M，阳性表达率最高；观察组临床耐药者sorcin基因表达显著高于非临床耐药者（P〈0．001），且CR率显著低于非临床耐药者（P〈0．001）。结论sorcin基因过度表达与AML患者临床耐药密切相关，是影响预后的重要因素；sorcin可作为检测AML临床耐药和判断预后的指标之一。     

急性白血病患者Survivin基因表达与耐药的关系

目的　探讨急性白血病 (AL)患者Survivin基因表达及其与临床耐药的关系。方法　应用半定量RT PCR方法检测 71例急性白血病患者 ,10例健康人的Survivin、mdr1基因mRNA表达水平 ,并分析其临床意义。结果　AL患者Survivin、mdr1mRNA表达阳性率分别为 67.61%和 49.3 0 %。急性淋巴细胞白血病 (ALL)和急性非淋巴细胞白血病 (ANLL)患者SurvivinmRNA表达阳性率均高于对照组 (分别为P <0 .0 1,P <0 .0 5 )。半定量后进行方差分析 ,ANLL和ALL患者SurvivinmRNA表达水平 (分别为 0 .64± 0 .2 1,0 .63± 0 .15 )均高于对照组 ( 0 .3 3± 0 .0 1,P <0 .0 5 )。耐药组患者SurvivinmRNA表达阳性率高于敏感组 (P <0 .0 5 )。Survivin阳性mdr1阳性患者耐药比例 ( 73 .0 8% )明显高于Survivin阴性mdr1阴性患者 ( 3 1.2 5 % ,P <0 .0 1)。在 61例初治和复发AL患者Sur vivinmRNA表达水平和mdr1mRNA表达水平呈高度正相关 (r =0 .75 4,P <0 .0 0 1)与骨髓白血病细胞百分比呈正相关 (r =0 .3 89,P =0 .0 0 5 )。结论　Survivin基因在AL患者呈高表达 ,与临床耐药密切相关 ,有望成为AL靶向治疗的一个潜在靶点     

多发性骨髓瘤患者Sorcin基因表达与多药耐药的关系

应用半定量逆转录聚合酶链反应 (RT- PCR)技术 ,检测 32例多发性骨髓瘤 (MM)患者、2 7例非恶性血液病患者和健康人的 Sorcin基因表达水平。结果为 MM患者 Sorcin基因表达高于正常对照组 ,差异高度显著(P<0 .0 0 1) ;Sorcin基因阳性表达初诊组 4例 (2 2 .2 % )、缓解组 1例 (14 .3% )、复发难治组 5例 (71.4 % ) ,复发难治组高于初诊组和缓解组 ,差异显著 (分别为 P=0 .0 315 ,P=0 .0 4 89) ;临床耐药组 Sorcin基因阳性表达显著高于非临床耐药组 (P=0 .0 0 4 ) ;Sorcin基因阳性表达者缓解率为 2 0 .0 % ,阴性表达者为 86 .4 % ,差异高度显著 (P=0 .0 0 2 )。认为多发性骨髓瘤患者临床耐药与 Sorcin基因过度表达密切相关 ,Sorcin基因过度表达是影响预后的重要因素 ,可作为检测临床耐药和判断预后的指标之一     

老年白血病bcr/abl融合基因的表达及其临床意义

目的　观察bcr/abl融合基因在老年白血病的表达及其临床意义。　 方法 　应用逆转录聚合酶链反应 (RT PCR)一步法检测 62例老年白血病患者bcr/abl融合基因的表达。　 结果 　 62例患者中bcr/abl融合基因阳性 5 3例 ,阳性率 85 5 % ,其中急性淋巴细胞白血病 (ALL) 17例 ,阳性 9例 (5 2 9% ) ;慢性粒细胞白血病 (CML)45例 ,阳性 44例 (97 88% )。DOCP方案治疗 7例bcr/abl ALL患者完全缓解 (CR)率 2 8 6% ,6例bcr/abl-ALL患者CR率 66 7% (P <0 0 1)。　 结论　bcr/abl融合基因检测有助于CML和ALL的临床诊断、治疗选择、微小残留病变 (MRD)监测以及预后判断 ;老年ALLbcr/abl融合基因阳性率较高 ,可能是其治疗效果较差的原因之一 ;bcr/abl ALL患者CR率明显低于bcr/abl-ALL患者 ;RT PCR一步法特异性好、敏感性高、简便快速 ,尤其适用于MRD的临床监测。     

急性白血病患者血管内皮生长因子及其受体表达的临床意义

目的 :探讨血管内皮生长因子 (VEGF)及其受体 (VEGFR)在成人急性白血病 (AL)中的表达、对临床疗效和预后的影响以及与多药耐药的关系。方法 :采用逆转录 聚合酶链反应 (RT PCR)方法检测 6 4例成人AL患者VEGF、VEGFR 1、VEGFR 2、mdr 1mRNA表达水平。结果 :VEGF基因在AL组中表达的平均水平和阳性率均高于正常对照组 (P <0 .0 5 )。其中急性粒细胞白血病 (AML)组广泛表达 ,明显高于正常对照组 (P <0 .0 5 ) ,而急性淋巴细胞白血症 (ALL)组的表达与正常对照组相比差异无显著性意义 (P >0 .0 5 )。AL组VEG FR 1表达阳性率高于正常对照组 (P <0 .0 5 ) ;VEGFR 2表达阳性率与正常对照组相比无显著性意义 (P >0 .0 5 )。VEGF表达水平在临床耐药组高于临床敏感组 (P <0 .0 5 ) ,是影响缓解率和生存期的危险因素。VEGF与mdr 1表达无相关关系。结论 :VEGF及VEGFR 1基因在成人AL患者中有异常表达 ,是影响成人AL患者临床疗效和预后的因素之一。     

急性髓系白血病患者原发性mdr1基因与CD34抗原表达及预后关系

应用RT－PCR技术对31例初诊急性髓细胞白血病（AML）患者mdr1基因进行检测、发现mdr1表达率为41．94％；AML亚型中以M5的mdr1表达率最高，M3最低；mdr1表达与临床患者耐药发生率显著相关。同时应用一级相关单抗，采用碱性磷酸酶抗碱性磷酸酶方法分析了患者细胞免疫标记与mdr1表达及预后的关系，结果显示，CD34与mdr1协同表达者耐药发生率更高。提示进行mdr1基因表达检测的同时，观察CD34表达情况，可能对预测化疗效果有意义。     

急性淋巴细胞白血病患者FLT3基因及FLT3/ITD基因突变的检测及临床意义

目的:研究急性淋巴细胞白血病(ALL)患者FLT3基因及其内部串联重复(ITD)突变情况。方法:采用多聚酶链反应(PCR)联合单链构象多态性(SSCP)方法检测76例不同免疫分型ALL患者FLT3基因及FLT3/ITD基因突变。结果:76例ALL患者经PCR扩增发现46例(60.5%)FLT3基因检测阳性,其中前前B细胞ALL、前B细胞ALL、成熟B细胞ALL及T细胞系ALL患者FLT3基因检测阳性率分别为88.2%(15/17),73.9%(17/23),40.0%(6/15)和23.5%(4/17);前前B细胞ALL和前B细胞患者ALL FLT3基因检测阳性率80.0%,显著高于成熟B细胞ALL(40.0%)(P<0.01);B细胞系ALL患者FLT3基因检测阳性率为69.1%,显著高于T细胞系ALL患者(23.5%)(P<0.01)。76例ALL患者中仅有2例(2.6%)出现FLT3/ITD基因突变,此2例均为伴有2种髓系抗原表达,免疫学检查诊断为急性混合细胞白血病患者,均伴有外周血高白细胞数、骨髓中高白血病细胞比例及预后较差。结论:B细胞系ALL和T细胞系ALL患者均可检测出FLT3基因,但B细胞系ALL患者FLT3基因检测阳性率显著高于T细胞系ALL;B细胞系ALL中细胞分化越成熟则FLT3基因检测率阳性越低。ALL患者一般不出现FLT3/ITD基因突变,FLT3/ITD基因突变检测可能有助于急性白血病基因分型及预后判断。     

慢性粒细胞白血病患者sorcin基因表达及其临床意义

目的探讨慢性粒细胞白血病患者可溶性耐药相关钙结合蛋白（sorcin）基因表达与临床耐药和疗效的关系。方法应用半定量逆转录聚合酶链反应（RT—PCR）检测31例慢性粒细胞白血病（CML）患者（CML组）和27例健康人（对照组）sorcin基因表达。结果CML组sorcin基因阳性表达率明显高于对照组（P〈0．01），其急变期患者阳性率高于慢性期和加速期患者（P分别为0．03和0．18）；CML临床耐药者sorcin基因表达显著高于非临床耐药者，疗效显著低于非临床耐药者。结论CML患者sorcin基因呈高表达，与临床耐药和预后密切相关；sorcin表达可作为检测临床耐药和判断CML患者预后的指标之一。     

Bcl-2与乳腺癌耐药蛋白基因在老年急性髓系白血病中表达的意义

目的 探讨Bcl-2和乳腺癌耐药蛋白(BCRP)基因在老年急性髓系白血病(AML)中的表达及其相关性.方法 RT-PCR法检测20例老年AML患者及20例老年非恶性血液病对照组的骨髓白细胞BCRP mRNA,同时流式细胞仪(FCM)检测其骨髓单个核细胞(BMMNC) Bcl-2蛋白表达.结果 AML组Bcl-2总阳性率较对照组显著增高,其中初治组阳性率与对照组无显著差异,而难治与复发组阳性率明显高于初治组和对照组(P＜0.05);BCRP总阳性率明显高于对照组,其中初治组和难治与复发组阳性率均较对照组明显增高(P＜0.05),而初治组和难治与复发组间无显著差异(P＞0.05).Bcl-2+组和BCRP+组完全缓解(CR)率明显低于Bcl-2-组和BCRP-组,早期复发率明显高于Bcl-2-组和BCRP-组(均P＜0.05).Bcl-2和BCRP基因在初治组和难治/复发组表达不相关(P＞0.05).结论 Bcl-2和BCRP基因均与临床耐药密切相关,二者高表达均提示预后不良,但二者无相关性,联合检测Bcl-2和BCRP基因对评价AML预后有较大意义.     

Fas和P-糖蛋白在急性白血病的表达及其在多药耐药中相关性的临床研究

目的:探讨Fas、P-糖蛋白(P-gp)在急性白血病(AL)的表达及二者在多药耐药(MDR)中的相关性.方法:应用流式细胞仪(FCM)测定57例初发AL患者治疗前及完全缓解(CR)后Fas、P-gp水平.结果:①Fas在初发急性髓性白血病(AML)中阳性表达率比急性淋巴细胞性白血病(ALL)高,P-gp在AML和ALL的阳性表达率差异无统计学意义;②在AL患者中,Fas 与P-gp 呈显著负相关;③单因素COX分析:Fas、P-gp过度表达对疗效有影响;多因素COX分析显示:Fas更具判断预后价值.④Fas 组CR率明显高于Fas-组,P-gp 组CR率明显低于P-gp-组.结论:①Fas过度表达可能是AL预后良好的因素;②P-gp为疗效差、预后不良的重要因素.     

Resistance of bcr-abl-positive acute lymphoblastic leukemia to daunorubicin is not mediated by mdr1 gene expression

In vitro resistance to anthracyclines is thought to be a poor prognosis in achieving long-term remission in patients with acute lymphoblastic leukemia (ALL). Expression of a multidrug resistance gene (mdr1) that codes for 170 Kd transmembrane glycoprotein is responsible for conferring resistance to malignant cells to anthracyclines. The t(9:22) translocation, resulting in bcr-abl fusion gene, is commonly found in B-lineage ALL and is known to be a poor prognostic factor for long-term remission. To investigate whether resistance to anthracyclines contributes to poor prognosis in bcr-abl-positive ALL, we studied daunorubicin sensitivity by an in vitro colorimetric methyl tetrazolium (MTT) assay in B-lineage ALL patients who were bcr-abl-positive and compared them with the B-lineage, age-matched bcr-abl-negative group. We also looked for and compared the presence of mdr1 gene expression in these two groups of patients by RT-PCR. Of the 46 patients included in the study, 16 (34.7%) were positive for the bcr-abl fusion gene. mdr1 gene expression was seen in 14 of these 46 patients (30.4%). However, the expression of the mdr1 gene was relatively lower in the bcr-abl-positive group (3 out of 16, 18.7%) compared to the bcr-abl-negative group (11 out of 30, 36.6%). The median LD(50) of daunorubicin (concentration lethal to 50% of the leukemic blasts) differed significantly between bcr-abl-positive and -negative patients (P = 0.018). This in vitro study suggests that bcr-abl-positive ALL is relatively resistant to daunorubicin, but this resistance is not mediated through mdr1 gene expression.     

cDNA芯片检测耐药急淋患者细胞凋亡调控相关基因的差异表达

目的通过观察耐药／非耐药急性淋巴细胞性白血病（急淋）患者细胞凋亡调控相关基因的差异表达,探索多药耐药的分子病理机制。方法用TRIzol抽提外周血标本总RNA，逆转录生成cDNA并标记后，与含有4096个人类已知基因的cDNA表达谱芯片杂交，检测细胞凋亡调控相关基因在两者间的差异表达。结果耐药组与非耐药组有150个基因表达显著差异，包括耐药组83个基因低表达，67个基因高表达，其中凋亡调控相关基因有6个低表达，8个高表达。结论细胞凋亡调控相关基因表达异常可能是白血病多药耐药的分子病理机制之一。     

急性白血病多药耐药基因及多药耐药相关蛋白基因的表达及临床研究

目的探讨急性白血病（ＡＬ）多药耐药基因（ｍｄｒ１）及多药耐药相关蛋白基因（ＭＲＰ）的表达与预后的关系。方法采用逆转录聚合酶链反应（ＲＴＰＣＲ）的方法检测５５例ＡＬ患者的ｍｄｒ１及ＭＲＰ的表达。结果发现复发急变组的ｍｄｒ１及ＭＲＰ基因表达水平（０．７３５±０．２４９,１．１５７±０．４４７）较初治组（０．４０８±０．１８６,０．４６５±０．２５３）明显升高（Ｐ＜０．０１）。而且ｍｄｒ１及ＭＲＰ同时高表达者的完全缓解（ＣＲ）率明显低于ｍｄｒ１及ＭＲＰ同时低表达者（Ｐ＜０．０１）。结论ｍｄｒ１和ＭＲＰ同时高表达是判断ＡＬ患者耐药复发及不良预后的重要因素。     

Effects of multidrug resistance, antisense RNA on the chemosensitivity of hepatocellular carcinoma cells

Introduction The overexpression of the multidrug resistance gene 1 (mdr1), a product of multidrug resistance multidrug resistance, is a major obstacle in cancer chemotherapy. Being a major P-glycoproteincancer chemotherapy. Being a major P-glycoprotein (P-gp), 17 kDa transmembrane protein acts as an energy-dependent drug efflux pump and keeps the concentration and efficacy intracellular anticancer drugs low.[1-4] Hepatocellular carcinoma (HCC) represents more than 5% of all cancers in the w…     

肺耐药蛋白在急性白血病中的表达及意义

目的 探讨急性白血病（AL）患者骨髓单个核细胞肺耐药蛋白（LRP）的表达及意义。方法 采用LRP单克隆抗体、流式细胞技术分别测定15例单纯缺铁性贫血患者（对照组）和65例AL患者（AL组）LRP的表达率。结果 LRP的表达率在初治和复发／难治急性淋巴细胞白血病（ALL）患者分别高于初治和复发／难治急性髓细胞白血病（AML）患者（P均〈0．05）；AML中M5亚型表达率高于M3亚型（P〈0．05）。初治及复发／难治LRP（＋）者缓解率明显低于LRP（-）者（P〈0．05）。结论 LRP的表达与AL患者临床预后密切相关，化疗前检测LRP表达率有助于个体化治疗和预测疗效。     

Induction of drug resistance in embryonal rhabdomyosarcoma treated with conventional chemotherapy is associated with HLA class I increase

Effectiveness of conventional cytotoxic treatment of rhabdomyosarcoma (RMS) may be limited by the development of multidrug resistance (MDR) mediated by mdr1 gene. This gene codes for P-glycoprotein (P-gp) which has been related to a immunoregulatory function. Modulation of HLA expression by P-gp has been described in different types of tumor cells including RMS. However, very little is known about biological implications of the P-gp expression in RMS patients treated with conventional chemotherapy. In order to study the problem, we used embryonal RMS tissue samples from treated patients. Our results indicated that positive RMS samples to mdr1 show higher HLA class I expression than those which were negative to mdr1 PCR, what indicates a significant correlation between the expression of both molecules. In addition, we developed two resistant RMS cell lines (A-204-1 and 2) using similar concentrations of actinomycin D as are plasma levels in clinical situation. Both resistant cell lines showed mdr1 expression and an increase of HLA class I expression which was dose-dependent. These results demonstrated that conventional chemotherapy of embryonal RMS is able to induce resistance which can modulate HLA class I expression and suggest that immunological studies of these tumors may be necessary to the design new specific therapeutic strategies.     

Multidrug resistance 1 gene expression and AgNOR in childhood acute leukemias

The multidrug resistance 1 (MDR1) gene product, P-glycoprotein (Pgp/p170) is a membrane protein, which acts as an ATP dependant efflux pump that expels a wide variety of organic compounds including chemotherapeutic agents from the cell. Pgp over expression has been demonstrated to be linked with poor treatment outcome and poor prognosis in a number of malignant tumors. AgNORs is a simple, reliable and inexpensive method of evaluating the proliferative activity of a tumor. We have studied MDR1 expression and AgNORS in 41 cases of acute leukemia in children. In this study, AgNOR counts in patients with acute lymphoblastic leukemia (ALL) L2 subtype (FAB classification) were significantly higher as compared to the ALL L1 subtype. Similarly, mean AgNOR count in the acute myeloid Leukemia (AML) M2 subtype was significantly higher as compared to the ALL L1 subtype. However, there was no correlation between AgNOR and treatment outcome or between AgNOR counts and MDR1 expression in any of the subtypes of acute leukemia included in this series. In AML, MDR1 gene expression was found to be related to reduced remission induction rates and hence poorer prognosis. In ALL, our study has shown no difference in remission induction between MDR1 positive and MDR1 negative cases. This would suggest that factors other than MDR1 may be of relevance in Pediatric ALL.