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目的探讨鼻咽癌MRI动态增强参数与微血管密度(MVD)和乏氧诱导因子-1α(HIF-1α)、血管内皮生长因子(VEGF)表达的相关性。方法①对14例鼻咽癌初诊患者,行MR动态增强扫描,获取该区域动态增强曲线,然后在标记处行鼻咽镜活检,测定活检部位的MVD和HIF-1α、VEGF表达水平;②观察动态增强曲线特征,测量并计算ROI的MRI动态增强参数。结果活检部位slope、MS、SImax与VEGF表达呈正相关关系(γ分别为0.889、0.882、0.619,P〈0.05),与HIF-1α表达呈正相关关系(γ分别为0.870、0.825、0.665,P〈0.05),与MVD也呈正相关关系(γ分别为0.627、0.755、0.693,P〈0.05);T1 on set、TTP与VEGF表达呈负相关关系(γ分别为-0.909,-0.829,P〈0.05),与HIF-1α表达呈负相关关系(γ分别为-0.687,-0.690,P〈0.05),与MVD也呈负相关关系(γ分别为-0.578,-0.852,P〈0.05)。结论鼻咽癌活检部位的MRI动态增强参数与MVD、HIF-1α、VEGF表达有统计学相关性;MR动态增强扫描结果为检测鼻咽癌肿瘤组织内乏氧与血管生成提供依据。 相似文献
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摘 要:肿瘤乏氧微环境的存在明显增加了肿瘤对临床常用治疗方法的抵抗和肿瘤自身的恶性程度。基于全氟化碳的纳米分子成像探针可携带、递送和释放氧气,具备可改善肿瘤乏氧的独特优势;另外,还能够进行19F-MR分子成像以监测和评价氧改善程度。其他协同当前多种临床常用以及全新的癌症诊疗方法方面都具有巨大的研究价值和应用潜力。全文对目前已研发的全氟化碳类纳米分子成像探针进行评述,讨论现有全氟化碳类纳米分子成像探针在缓解肿瘤乏氧微环境、协同不同癌症治疗方法方面研究进展。 相似文献
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肿瘤组织中普遍存在着乏氧现象,它将影响肿瘤治疗的敏感性,并促进肿瘤生长、侵袭及转移。若能准确诊断乏氧,即能提供预后信息,从而指导个性化的治疗。 相似文献
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乏氧诱导因子-1与肿瘤乏氧的研究进展 总被引:1,自引:1,他引:1
乏氧是实体肿瘤发展过程中的普遍现象,它能诱导肿瘤细胞发生一系列基因表达的改变以适应环境.乏氧诱导因子-1(hypoxia inducible factor-1,HIF-1)是其调控核心.一方面,HIF-1通过与靶基因启动子序列中的HRE结合调控其表达,增加肿瘤新血管和红细胞生成、改变能量代谢途径等,以增加氧的利用率、减少氧的消耗,同时通过调控细胞周期调节蛋白、凋亡相关基因的表达改变细胞周期、抑制细胞凋亡;另一方面,HIF-1的表达受多种基因产物的调控,如VHL,PTEN等.HIF-1有多种生物学功能,如促进红细胞生成、肿瘤血管形成、促进肿瘤的转移和侵袭等.通过药物或基因治疗的方式抑制HIF-1的活性是治疗肿瘤的一种新途径. 相似文献
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背景与目的:乳腺癌的新辅助化疗(neoadjuvant chemotherapy, NAC)已成为成熟的治疗方法,但疗效评估尚未有统一有效的方法。该研究即探讨定量动态增强磁共振在乳腺癌NAC疗效评估中的价值。方法:24例术前行NAC的乳腺癌确诊患者(24例均为浸润性导管癌),分别于NAC前、第2个疗程后、化疗结束但术前3个时间点行定量动态增强磁共振检查,分析NAC前后肿瘤最长径及动态增强磁共振定量参数:容量转移常数(Ktrans)、速率常数(Kep)、血管外细胞外间隙容积比(Ve)的变化。结果:24例患者均为单侧单发乳腺癌病灶,以RECIST标准分为有效组(17个)和无效组(7个),有效组与无效组Ktrans、Kep在NAC前与第2个疗程、化疗前与化疗结束差异均有统计学意义(P<0.05),Ve在有效组与无效组治疗前后差异均无统计学意义(P>0.05)。结论:定量动态增强磁共振可用来评估NAC疗效,并且Ktrans、Kep可做到定量,使评估结果更为客观真实,但Ve对判断治疗效果未见明显优势。 相似文献
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目的探讨骨肉瘤术前化疗后的肿瘤坏死率与预后的关系。方法选取2000年3月至2004年3月初诊经活检病理组织学诊断为骨肉瘤且经影像学检查排除远处转移的40例患者,术前给予大剂量甲氨蝶呤、阿霉素、顺铂和异环磷酰胺化疗1周期。根据对手术切除肿瘤标本的肿瘤坏死率测定将患者分为两组(肿瘤坏死率≥90%和<90%),分别随访两组患者的术后肺转移率和5年生存率并进行比较。结果 40例骨肉瘤患者中肿瘤坏死率≥90%组为23例,<90%组为17例,两组的术后肺转移率分别为21.7%和70.6%(χ2=11.831,P=0.001),5年生存率分别为78.3%和23.5%(χ2=9.545,P=0.002)。结论肿瘤坏死率测定是评价骨肉瘤术前化疗反应最直接可靠的方法,获肿瘤坏死率≥90%患者的远期转移率和生存时间优于肿瘤坏死率<90%患者。 相似文献
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摘 要:[目的] 探讨动态增强磁共振成像(DCE-MRI)定量DCE参数与胃腺癌T、N分期的相关性。[方法] 纳入河南省肿瘤医院2019年1月至2021年9月行DCE-MRI检查的胃腺癌患者88例,采用Spearman秩相关分析评价定量DCE参数Ktrans、Kep、Ve与胃腺癌T、N分期的相关性。对上述差异有统计学意义的参数绘制ROC曲线以明确鉴别胃腺癌T、N分期的最佳诊断参数及诊断效能。[结果] 定量DCE参数Ktrans、Kep、Ve与T分期间呈正相关(r=0.597、0.510、0.476,P均<0.001)。ROC分析表明Ve是鉴别胃腺癌T分期的最佳参数,其AUC值为0.924,灵敏度和特异度分别为100.0%、83.5%。Ktrans与N分期间呈正相关(r=0.276,P=0.009)。Ktrans鉴别N分期的AUC值为0.574,灵敏度和特异度分别为47.8%、76.9%。[结论] 定量DCE参数与胃腺癌T、N分期存在一定相关性,可能为从DCE-MRI方面评估胃腺癌的生物学行为、恶性程度及治疗方案的选择等提供了理论依据。 相似文献
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目的:初步探讨用99mTc-EC-MN对Lewis肺癌行SPECT显像,所得参数T/NT(肿瘤放射性计数与对侧放射性计数比值)和血管内皮生长因子(VEGF)的表达水平之间的相关性。方法:用99mTc标记EC-MN,制备12个Lewis肺癌昆明小鼠模型,采用乏氧显像剂99mTc-EC-MN对其进行SPECT显像,通过划感兴趣区技术计算肿瘤与对侧肌肉放射性计数比值(T/NT)。显像结束后即刻颈动脉放血处死小鼠,取出肿瘤瘤体,用免疫组化方法测定肿瘤组织VEGF的表达水平。结果:12个荷Lewis肺癌小鼠在注射显像剂99mTc-EC-MN后3小时的SPECT显像示T/NT值为1.42-2.06(均数为1.78±0.22);VEGF的表达0.25%-2.05%(中位数为1.1%);Lewis肺癌的T/NT值与VEGF的表达呈直线相关关系(t=2.557,P=0.0285)。结论:99mTc-EC-MN SPECT乏氧显像的T/NT值与VEGF表达水平之间存在一定的相关性。 相似文献
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[目的]探讨动态增强MRI结合扩散加权成像(DWI)对前列腺癌(PC)的诊断价值.[方法]对52例临床怀疑为PC者行MR平扫加动态增强、DWI检查,分析各项MRI图像及表观扩散系数(ADC)图并测量ADC值,根据MR平扫、DWI、平扫加动态增强及三者联合分别作出诊断并与临床及病理结果对照.[结果]MR平扫、DWI、平扫加动态增强及三者联合对PC的定性诊断准确率分别为73.1%、84.6%、88.5%、92.3%,分期诊断准确率分别为62.5%、70.8%、75.0%、87.5%.单纯平扫与平扫加动态增强、三者联合的定性诊断准确率有统计学差异(P<0.05);DWI与平扫加动态增强、三者联合无统计学差异(P>0.05).[结论] PC在MR动态增强及DWI上有特征性表现,MR平扫结合动态增强及DWI有利于提高PC的诊断准确率. 相似文献
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目的:分析动态增强磁共振血流灌注成像(dynamic contrast-enhanced magnetic resonance image,DCE-MRI)参数与直肠癌血管生成参数及临床病理参数的相关性。方法:随机选取2016年2月至2019年1月在我院手术后病理确诊的直肠癌患者58例,术前行DCE-MRI,对肿瘤横断面兴趣区定量检测Ktrans、Ke、Ve和iAUC,术后病理采用Western blot检测血管内皮细胞生长因子(vasular endothelial growth factor,VEGF)表达,免疫组化法检测微血管密度(microvascular density,MVD),评价Ktrans、Ke、Ve和iAUC在直肠癌临床病理参数[病理分期(T1、T2、T3、T4)、淋巴结转移(阴性vs阳性)、远处转移(阴性vs阳性)、血管浸润(阴性vs阳性)、神经浸润(阴性vs阳性)]中的差异。Pearson Rank相关性方法分析Ktrans、Ke、Ve和iAUC与直肠癌血管生成相关参数VEGF及MVD的相关性。结果:Ktrans及Kep在不同T分期直肠癌中差异有统计学意义(P<0.001、P<0.001),组间比较,Ktrans在T4期高于T3、T2及T1期(P<0.001、P<0.001、P<0.001),Kep在T4期高于T3、T2及T1期(P<0.01、P<0.001、P<0.001)。Ktrans及Kep在淋巴结转移(阴性vs阳性)、远处转移(阴性vs阳性)、血管浸润(阴性vs阳性)、神经浸润(阴性vs阳性)差异无统计学意义(P均>0.05)。Pearson Rank相关性分析显示,Ktrans及Kep随着VEGF、MVD水平升高而升高,二者为正相关(P<0.000 1、P<0.000 1);Ve和iAUC与VEGF、MVD水平无相关性(P>0.05、P>0.05)。结论:DCE-MRI参数Ktrans及Kep可对直肠癌血管生成参数及临床病理T分期进行评估,可以作为术前肿瘤生物学行为的预测参数。 相似文献
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The purpose of this study was to evaluate the effectiveness of dynamic contrast-enhanced MRI (DC-MRI) for assessing the pattern of invasion of tongue carcinomas. We studied 20 cases of squamous cell carcinoma of the tongue that showed peripheral enhancement patterns on DC-MRI. The diameter of each tumor was >2.0 cm and no apparent artifacts were seen. The signal enhancement to noise ratio (SE/N) of the regions of interest, which were located in the central and peripheral regions of the tumor, were measured using DC-MRI, while maximum SE/N, %-wash out, and the ascending rate of SE/N were also calculated. The histopathological pattern of invasion was assessed in each case and used to classify them into clear (13 cases) and diffuse (7 cases) groups, after which the 4 parameters were compared between the 2 groups. The ascending rate of SE/N in the peripheral region was significantly lower in the diffuse group (p=0.047). There were no other significant differences between the 2 groups for any parameter in either tumor region. These results suggest that DC-MRI is able to show the histopathological pattern of invasion into surrounding structures. 相似文献
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目的 探讨组织四维动态增强(tissue 4 dimensional-dynamic contrast enhanced,T4D-DCE)磁共振成像(MRI)灌注参数在评估原发性肝癌(primary liver cancer,PLC)微血管密度(microvessel density,MVD)中的价值.方法 51例PLC患者行T4D-DCE MRI成像,并用Tissue-4D软件分析病灶和正常肝组织的灌注参数:转运常数(Ktrans)、血管外细胞外间隙体积百分比(Ve)、速率常数(Kep),将病灶灌注参数和正常肝组织灌注参数的比值作为病灶相对灌注参数与病理结果进行对比.结果 各灌注参数与PLC病理等级均无相关性(P>0.05).Ktrans病灶、Ktrans相对、Kep相对与MVD均存在正相关(r=0533、0.791、0.717,P<0.001).结论 T4D-DCE能直观反映PLC的血流灌注信息,在诊断PLC及评估PLC微循环特征中具有重要参考价值. 相似文献
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目的探讨星形细胞瘤MRI定量指标与PCNA表达的关系.方法收集手术病理证实的脑星形细胞瘤32例,计算下列MRI定量指标:T1WI、T2WI上的相对信号强度(RSk)、增强后相对信号强度(RSIGd)及信号强度增加百分率(EP).采用免疫组化的方法标记PCNA,对照MRI定量参数与PCNA标记指数之间的关系.结果恶性组与偏良性组之间,上述MRI定量参数均有统计学差异;增强后相对信号强度(RSIGd)及信号强度增加百分率(EP)与PCNA呈正相关.结论增强后相对信号强度(RSOGd)及信号强度增加百分率(EP)可以较好地反应星形细胞瘤的PCNA表达强弱和病理级别. 相似文献
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Hisatomi M Asaumi J Yanagi Y Unetsubo T Maki Y Murakami J Matsuzaki H Honda Y Konouchi H 《Oral oncology》2007,43(9):940-947
To evaluate the diagnostic value of dynamic contrast-enhanced MRI (DCE-MRI) in salivary gland tumors, thirty-five patients (47 lesions) who underwent MR examinations and were histopathologically diagnosed with salivary gland tumors in Okayama University Hospital, between April 1998 and March 2005, were entered in the present study. The parameters included CI(max300) or CI(max600), which was the contrast index (CI) at maximal contrast enhancement upon 300 s or 600 s, and Tmax, which was the time that corresponded to the CI(max300). Washout ratio (WR(300) or WR(600)) was defined as follows: CI(max300)-CI(300s)/CI(max300) or CI(max600)-CI(600s)/CI(max600)x100 (%), where CI(300) or CI(600) was the CI at 300s or 600s after contrast medium administration. We obtained the following results from the analysis of DCE-MRI parameters; (a) The salivary gland tumors were categorized into three CI curve types according to Tmax and WR300; Pleomorphic adenoma; Tmax > 210 s and WR300 < 10%, Warthin tumor; Tmax < 60 s and WR300 > 40%, and malignant tumor; 60s < Tmax < 210 s and 10% < WR300 < 30%; (b) On the basis of the relationship between Tmax and CImax or WR, all pleomorphic adenomas were successfully differentiated from Warthin tumor lesions. Of the 20 pleomorphic adenomas, 18 (90.0%) were successfully differentiated from malignant tumors. All Warthin tumor lesions were successfully differentiated from pleomorphic adenomas and malignant tumors. Of 12 the malignant tumors, 11 (91.7%) were successfully differentiated from pleomorphic adenomas. All malignant tumors were successfully differentiated from Warthin tumors. Thus, DCE-MRI parameters are useful in diagnosing salivary gland tumors on the basis of the combined assessment of Tmax and CImax or WR. 相似文献
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Jinhong Wang Weixia Chen Xiuhui Zhang Pengqiu Min Rongbo Liu Hengxuan Yang 《中国肿瘤临床(英文版)》2005,2(3):615-621
OBJECTIVE To prospectively investigate the correlation between the enhancement parameters of a dynamic-CT (D-CT) scan for renal cell carcinomas (RCC) and the carcinoma tissue microvessel density (MVD) in renal cell carcinomas (RCC).METHODS Twenty-four cases of renal cell carcinoma verifyied by histopathology were scanned via dynamic-CT, followed by a whole kidney scan. Enhancement parameters were derived as follows .The slope of the contrast media uptake curve (S), area under the curve(AR), the density difference before and after tissue enhancement (△HU) and tissue blood ratio (TBR) were calculated for all lesions. Time-density curve types were ranked from the lowest to the highest of the slope of the contrast media uptake curve (S) as type A, B and C. Pathologic slides corresponding to the CT imagings were subjected to CD34 monoclonal antibodies, then were evaluated with an image analyzer to count hot spots of MVD. By using the Spearman rank correlation tests, statistical analysis was performed to determine the strength of the relationship between enhancement parameters and MVD determinations.RESULTS The carcinoma tissue MVD showed a direct correlation with the enhancement parameters of D-CT (r=0.54, r=0.62, r=0.55, r=0.64, r=0.44,P< 0.05). Moreover the S, △HU, TBR and type curves all demonstrated a strong correlation with the MVD. By analyzing the various enhancement parameters of the time-density curves, the relationship between the enhancement CT parameters corresponding to the tumor's MVD was identified.CONCLUSION A dynamic spiral-CT scan may be a helpful method as a measurement of tumor angiogenesis in vivo in RCC. 相似文献