ABCC8 is correlated with immune cell infiltration and overall survival in lower grade glioma

ATP binding cassette subfamily C member 8(ABCC8)encodes a protein regulating the ATP-sensitive potassium channel.Whether the level of ABCC8 mRNA in lower grade glioma(LGG)correlates with immune cell infiltration and patient outcomes has not been evaluated until now.Comparisons of ABCC8 expression between different tumors and normal tissues were evaluated by exploring publicly available datasets.The association between ABCC8 and tumor immune cell infiltration,diverse gene mutation characteristics,tumor mutation burden(TMB),and survival in LGG was also investigated in several independent datasets.Pathway enrichment analysis was conducted to search for ABCC8-associated signaling pathways.Through an online database,we found that ABCC8 expression in LGG was lower than in normal tissues.Then,the association of ABCC8 expression and immune cell infiltration in LGG was discussed.As we expected,the ABCC8 mRNA levels were negatively associated with non-T immune cell infiltration levels in all datasets.Consistently,TCGA_LGG RNA-seq data revealed that ABCC8 downregulated several non-T immune cell-associated signaling pathways in gene set enrichment analysis.Different ABCC8 expression groups showed diverse gene mutation characteristics and TMB.The high expression of ABCC8 was linked to improved survival of LGG patients.A pathway enrichment analysis of ABCC8-associated genes indicated that the GABAergic synapse signaling pathway might be involved in regulating immunity in LGG.Our findings show that ABCC8 reflects LGG tumor immunity and is an ideal prognostic biomarker for LGG.

Radiotherapy of high-grade gliomas: current standards and new concepts, innovations in imaging and radiotherapy, and new therapeutic approaches

The current standards in radiotherapy of high-grade gliomas(HGG) are based on anatomic imaging techniques, usually computed tomography(CT) scanning and magnetic resonance imaging(MRI). The guidelines vary depending on whether the HGG is a histological grade 3 anaplastic glioma(AG) or a grade 4 glioblastoma multiforme(GBM). For AG, T2-weighted MRI sequences plus the region of contrast enhancement in T1 are considered for the delineation of the gross tumor volume(GTV), and an isotropic expansion of 15 to 20 mm is recommended for the clinical target volume(CTV). For GBM, the Radiation Therapy Oncology Group favors a two-step technique, with an initial phase(CTV1) including any T2 hyperintensity area(edema) plus a 20 mm margin treated with up to 46 Gy in 23 fractions, followed by a reduction in CTV2 to the contrast enhancement region in T1 with an additional 25 mm margin. The European Organisation of Research and Treatment of Cancer recommends a single-phase technique with a unique GTV, which comprises the T1 contrast enhancement region plus a margin of 20 to 30 mm. A total dose of 60 Gy in 30 fractions is usually delivered for GBM, and a dose of 59.4 Gy in 33 fractions is typically given for AG. As more than 85% of HGGs recur in field, dose-escalation studies have shown that 70 to 75 Gy can be delivered in 6 weeks with relevant toxicities developing in < 10% of the patients. However, the only randomized dose-escalation trial, in which the boost dose was guided by conventional MRI, did not show any survival advantage of this treatment over the reference arm. HGGs are amongst the most infiltrative and heterogeneous tumors, and it was hypothesized that the most highly aggressive areas were missed; thus, better visualization of these high-risk regions for radiation boost could decrease the recurrence rate. Innovations in imaging and linear accelerators(LINAC) could help deliver the right doses of radiation to the right subvolumes according to the dose-painting concept. Advanced imaging techniques provide functional information on cellular density(diffusion MRI), angiogenesis(perfusion MRI), metabolic activity and cellular proliferation [positron emission tomography(PET) and magnetic resonance spectroscopy(MRS)]. All of these non-invasive techniques demonstrated good association between the images and histology, with up to 40% of HGGs functionally presenting a high activity within the non- contrast-enhanced areas in T1. New LINAC technologies, such as intensity-modulated and stereotactic radiotherapy, help to deliver a simultaneous integrated boost(SIB) > 60 Gy. Trials delivering a SIB into a biological GTV showed the feasibility of this treatment, but the final results, in terms of clinical benefits for HGG patients, are still pending. Many issues have been identified: the variety of MRI and PET machines(and amino-acid tracers), the heterogeneity of the protocols used for image acquisition and post-treatment, the geometric distortion and the unreliable algorithms for co-registration of brain anatomy with functional maps, and the semi-quiescent but highly invasive HGG cells. These issues could be solved by the homogenization of the protocols and software applications, the simultaneous acquisition of anatomic and functional images(PET-MRI machines), the combination of complementary imaging tools(perfusion and diffusion MRI), and the concomitant addition of some ad hoc targeted drugs against angiogenesis and invasiveness to chemoradiotherapy. The integration of these hybrid data will construct new synthetic metrics for fully individualized treatments.

High-grade gliomas: reality and hopes

In this issue of the Chinese Journal of Cancer, European experts review current standards, trends, and future prospects in the difficult domain of high-grade glioma. In all fields covered by the different authors, the progress has been impressive. For example, discoveries at the molecular level have already impacted imaging, surgery, radiotherapy, and systemic therapies, and they are expected to play an increasing role in the management of these cancers. The European Organization for Research and Treatment of Cancer(EORTC) has pioneered new treatment strategies and contributed to new standards. The articles in this issue will cover basic molecular biological principles applicable today, novel surgical approaches, innovations in radiotherapy planning and delivery, evidence-based standards for radiotherapy alone or combined with chemotherapy, current standards and novel approaches for systemic treatments, and the important but often neglected field of health-related quality of life. Despite the advances described in these articles, the overall prognosis of high-grade glioma, especially glioblastoma, remains poor, and more research is needed to address this problem.

Molecular biology of high-grade gliomas: what should the clinician know?

The current World Health Organization classification system of primary brain tumors is solely based on morphologic criteria. However, there is accumulating evidence that tumors with similar histology have distinct molecular signatures that significantly impact treatment response and survival. Recent practice-changing clinical trials have defined a role for routine assessment of O-6-methylguanine-DNA methyltransferase(MGMT) promoter methylation in glioblastoma patients, especially in the elderly, and 1p and 19q codeletions in patients with anaplastic glial tumors. Recently discovered molecular alterations including mutations in IDH-1/2, epidermal growth factor receptor(EGFR), and BRAF also have the potential to become targets for future drug development. This article aims to summarize current knowledge on the molecular biology of high-grade gliomas relevant to daily practice.

Genomic profiling of lower-grade gliomas uncovers cohesive disease groups:implications for diagnosis and treatment

Lower-grade gliomas(including low-and intermediate-grade gliomas,World Health Organization grades II and III)are diffusely infiltrative neoplasms that arise most often in the cerebral hemispheres of adults and have traditionally been classified based on their presumed histogenesis as astrocytomas,oligodendrogliomas,or oligoastrocytomas.Although the histopathologic classification of lower-grade glioma has been the accepted standard for nearly a century,it suffers from high intra-and inter-observer variability and does not adequately predict clinical outcomes.Based on integrated analysis of multiplatform genomic data from The Cancer Genome Atlas,lower-grade gliomas have been found to segregate into three cohesive,clinically relevant molecular classes.Molecular classes were closely aligned with the status of isocitrate dehydrogenase(IDH)mutations,tumor protein 53 mutations and the co-deletion of chromosome arms 1 p and 19q,but were not closely aligned with histologic classes.These findings emphasize the potential for improved definition of clinically relevant disease subsets using integrated molecular approaches and highlight the importance of biomarkers for brain tumor classification.

Repeated operations for infiltrative low - grade gliomas without intervening therapy.

OBJECT:Progression of infiltrative low-grade gliomas(LGGs)has been reported previously.The limitations ofsuch studies include diverse histological grading systems,intervening therapy,and the lack of histological confir-mation of malignant tumor progression.The aim of this study was to determine tumor progression in adult patientswith an initial diagnosis of infiltrative LGG who subsequently underwent a repeated operation,but no other inter-vening therapy.The authors examined factors that may be associated with tumor progression.

Magnetic Resonance Perfusion Imaging in the Diagnosis of High-Grade Glioma Progression and Treatment-Related Changes: A Systematic Review

In patients with high grade gliomas (HGGs), progression after treatment can be difficult to diagnose due to treatment-related effects, which overlap in appearance with tumour progression on conventional magnetic resonance imaging (MRI) sequences. Specialised imaging methods have been studied for this purpose, though most institutions currently use histopathology or clinicoradiological follow-up for diagnosis. This publication aims to review the evidence for perfusion MRI techniques. The databases of Pubmed, MEDLINE, EMBASE and Scopus were searched using combinations of the subject headings high grade glioma and MRI perfusion. 41 articles fulfilled the inclusion criteria. Dynamic Susceptibility Contrast (DSC) MRI was the most extensively studied, with several studies achieving high sensitivities and specificities. Other techniques exhibiting potential include Dynamic Contrast Enhanced (DCE) MRI, Arterial Spin Labelling (ASL). However, these techniques are not widely used or available for clinical practice. Composite measures combining results from multiple techniques tended to achieve higher accuracies. Some publications compared processing software used or looked at machine learning with relative success. An issue common to the literature is the lack of standardisation in the reference standard and acquisition/processing methods. Furthermore, many had small sample sizes, and further consideration needs to be given with regards to timing of imaging, and treatment regimens received in such studies.

Temozolomide resistance in high grade gliomas

High grade gliomas are always the research focus in the field of neurosurgery due to their poor prognosis despite the current standard therapeutic regimen of surgical resection followed by radiation therapy and chemotherapy. Alkylating agent temozolomide has been established as the standard chemotherapy while its resistance inevitable during treatment. This phenomenon seriously influences the prognosis of patients suffering from high grade gliomas. This review aims to elucidate temozolomide chemoresistance mechanisms through three chapters including O^6-methylguanine-DNA methyltransferase(MGMT) methylation, mismatch repair mutation and epigenetic regulation consisting of p21, chromatin and histone, Y-box binding protein-1 and micro RNAs.

Comparative profiling of immune genes improves the prognoses of lower grade gliomas

Objective:Lower grade gliomas(LGGs),classified as World Health Organization(WHO)grade II and grade III gliomas,comprise a heterogeneous group with a median survival time ranging from 4–13 years.Accurate prediction of the survival times of LGGs remains a major challenge in clinical practice.Methods:We reviewed the expression data of 865 LGG patients from 5 transcriptomics cohorts.The comparative profile of immune genes was analyzed for signature identification and validation.In-house RNAseq and microarray data from the Chinese Glioma Genome Atlas(CGGA)dataset were used as training and internal validation cohorts,respectively.The samples from The Cancer Genome Atlas(TCGA)and GSE16011 cohorts were used as external validation cohorts,and the real-time PCR of frozen LGG tissue samples(n=36)were used for clinical validation.Results:A total of 2,214 immune genes were subjected to pairwise comparison to generate 2,449,791 immune-related gene pairs(IGPs).A total of 402 IGPs were identified with prognostic values for LGGs.The HOXA9-related and CRH-related scores facilitated identification of patients with different prognoses.An immune signature based on 10 IGPs was constructed to stratify patients into low and high risk groups,exhibiting different clinical outcomes.A nomogram,combining immune signature,1p/19q status,and tumor grade,was able to predict the overall survival(OS)with c-indices of 0.85,0.80,0.80,0.79,and 0.75 in the training,internal validation,external validation,and tissue sample cohorts,respectively.Conclusions:This study was the first to report a comparative profiling of immune genes in large LGG cohorts.A promising individualized immune signature was developed to estimate the survival time for LGG patients.

Plasticity of language pathways in patients with low-grade glioma A diffusion tensor imaging study

Knowledge of the plasticity of language pathways neurosurgeons to achieve maximum resection wh n patients with low-grade glioma is important for e preserving neurological function. The current study sought to investigate changes in the ventral language pathways in patients with low-grade glioma located in regions likely to affect the dorsal language pathways. The results revealed no significant difference in fractional anisotropy values in the arcuate fasciculus between groups or between hemispheres. However, fractional anisotropy and lateralization index values in the left inferior longitudinal fasciculus and lateralization index values in the left inferior fronto-occpital fasciculus were higher in patients than in healthy subjects. These results indicate plasticity of language pathways in patients with low-grade glioma. The ventral language pathways may perform more functions in patients than in healthy subjects. As such, it is important to protect the ventral language pathways intraoperatively.

Hypodense cerebellar tuberculoma on CT scan masquerading low grade glioma

We report a case of hypodense cerebellar tuberculoma in a 26 year old postpartum lady who presented with one episode of generalized tonic-clonic seizures and discuss the histopathology findings where on CT scan the lesion was suspected as low grade glioma.She was started on isoniazid,rifampicin,pyrazinamide,ethambutol and pyridoxine.She is asymptomatic and had no neurological deficits at follow up.

Adaptability of language-related brain network in a low-grade glioma patient

Because functional magnetic resonance imaging can be used for dynamic observation of functional cortical changes after brain injuries, we followed up functional magnetic resonance imaging manifestations of a language-related brain network in a low-grade glioma patient. Disease progression and therapy during a 3-year period were followed up at different time points： before and after reoperation, after radiation therapy, and 1 year after irradiation. During the whole 3-year follow-up period, the patient exhibited no neurological deficits while functional magnetic resonance imaging revealed different topologies of the language-related brain network. During disease progression and after irradiation, the language-related brain network was extended or completely transferred to the nondominant （right） hemisphere. In addition, after reoperation and 1 year after irradiation, language areas were primarily found in the language dominant （left） hemisphere. Our results suggest a high level of adaptability of the language-related cortical network of the bilateral hemispheres in this low-grade glioma patient.

H3和IDH野生型弥漫性儿童型高级别胶质瘤6例临床病理分析

目的探讨中枢神经系统H3和IDH野生型弥漫性儿童型高级别胶质瘤的临床病理学及分子特征。方法收集上海交通大学医学院附属新华医院病理科诊断的6例H3和IDH野生型弥漫性儿童型高级别胶质瘤的临床病理资料,采用免疫组化(全自动免疫组化染色仪)检测GFAP、Olig2、Syn、NeuN、IDH1、H3K27M等蛋白的表达,FISH法检测EGFR、MYCN基因扩增,Sanger测序检测IDH、H3F3A、TERT基因突变,并复习相关文献。结果本组6例患者年龄范围5~11岁,中位年龄7.5岁。其中男性2例,女性4例,男女比1∶2。临床症状表现为肢体乏力、偏瘫、呕吐、抽搐、视物模糊等。肿瘤发生部位:5例位于幕上,1例位于幕下脑干和小脑。组织学形态:3例表现为高级别胶质瘤形态学特征,其中2例伴有瘤巨细胞;2例表现为胚胎性肿瘤样特征,1例同时具有高级别胶质瘤及胚胎性肿瘤样形态学特点。5例伴有微血管增生和(或)坏死;1例间质黏液变/微囊形成。免疫表型:肿瘤细胞GFAP(6/6)和Olig2(6/6)部分或局灶阳性,Syn(3/6)和NeuN(1/6)局灶或散在阳性,IDH1、H3K27M、H3G34V和H3G34R均阴性,ATRX、H3K27me3、INI1、BRG1均弥漫阳性(6/6)。p53阳性5%~95%不等,Ki67增殖指数40%~90%。分子检测示6例均为IDH1/2和H3F3A野生型;2例MYCN扩增;2例EGFR扩增伴多倍体;1例同时伴有EGFR扩增和MYCN扩增;1例PDGFRA扩增。治疗及随访情况,术后放疗和(或)替莫唑胺化疗;3例于术后1~5个月死亡;2例存活,随访截至2024年1月,分别随访4个月和7个月;1例失访。结论H3和IDH野生型弥漫性儿童型高级别胶质瘤是一种高度恶性肿瘤,组织学表现为胶质母细胞瘤样或胚胎性肿瘤样特征,根据分子遗传学特征分为RTK1、RTK2、MYCN三种分子亚型,其中MYCN亚型预后最差。诊断时应注意与其他儿童型或成人型高级别胶质瘤及胚胎性肿瘤鉴别。

CT-MRI同体位图像融合在高级别脑胶质瘤放射治疗靶区勾画中应用

目的探讨同体位MRI图像(MRIsim)与CT模拟定位图像融合在高级别脑胶质瘤放射治疗靶区勾画中的临床应用价值。方法选择20例脑胶质瘤术后放射治疗患者,其中男性13例,女性7例;年龄39~69岁,平均年龄45.5岁;全部为单发病变;均已行全切或不全切手术,全部经病理组织诊断证实;世界卫生组织(WHO)分级Ⅲ级6例,Ⅳ级14例。将每例患者的同体位MRIsim、常规MRI影像(MRIconv)分别与CT模拟定位图像融合。运用Dice相似指数(DSC)和豪斯多夫距离(HD)算法来评价配准的精确度。在CT与MRIsim融合图像(Fusion-CT MRIsim)、CT与MRIconv融合图像(Fusion-CT MRIconv)上分别勾画危及器官(OAR)及靶区[大体肿瘤靶区(GTV)、临床肿瘤靶区(CTV)]。评估两种融合图像(即Fusion-CT MRIsim组和Fusion-CT MRIconv组)OAR勾画体积、GTV、CTV及剂量学差异。结果融合精确度评估:除全脑外,Fusion-CT MRIsim组其余OAR DSC均高于Fusion-CT MRIconv组(P<0.05);Fusion-CT MRIsim组OAR HD小于Fusion-CT MRIconv组(P<0.05)。OAR勾画体积比较:Fusion-CT MRIsim组OAR勾画体积与Fusion-CT MRIconv比较,差异无统计学意义(P>0.05)。靶区:Fusion-CT MRIsim组GTV、CTV小于Fusion-CT MRIconv组[(118.2±8.0)cm^(3)vs(125.3±8.1)cm^(3)、(234.3±12.8)cm^(3)vs(256.0±13.4)cm^(3)],差异有显著统计学意义(均P=0.000)。剂量学比较:Fusion-CT MRIsim组D_(max)-PTV、D_(mean)-PTV与Fusion-CT MRIconv组[(6432.9±23.0)cGy vs(6430.4±25.2)cGy、(6159.0±13.7)cGy vs(6166.2±17.3)cGy]比较,差异无统计学意义(P>0.05)。结论CT-MRI同体位融合图像配准精确度高,可降低全脑平均剂量(D_(mean))及缩小GTV及CTV,是高级别脑胶质瘤术后精确放射治疗值得广泛应用的临床方法。

复发高级别脑胶质瘤患者伽玛刀放疗预后危险因素及风险预测模型构建

目的分析复发高级别脑胶质瘤患者伽玛刀放疗预后的危险因素,并构建风险预测模型。方法回顾性收集2019年1月至2022年1月于医院接受伽玛刀放疗的85例复发高级别脑胶质瘤患者临床资料,依据随访1 a期间预后情况将资料分为病死组(n=40)与存活组(n=45)。采用Cox回归分析影响复发高级别脑胶质瘤患者伽玛刀放疗预后的因素,根据回归分析结果构建风险预测模型,利用R软件构建列线图,并绘制受试者工作特征曲线评估风险模型的预测效能。结果病死组年龄、最大肿瘤直径大于存活组,而靶区周边剂量、放疗前Karnofsky功能状态(KPS)评分低于存活组,差异有统计学意义(P<0.05);经Cox回归分析显示,年龄、最大肿瘤直径为复发高级别脑胶质瘤患者伽玛刀放疗后病死的危险因素(HR>1,P<0.05),而靶区周边剂量、放疗前KPS评分为复发高级别脑胶质瘤患者伽玛刀放疗后病死的保护因素(HR<1,P<0.05);绘制列线图构建复发高级别脑胶质瘤患者伽玛刀放疗预后病死风险预测模型,验证模型区分度显示一致性指数(C-index)值=0.876,具有良好的区分度;绘制标准曲线显示,校准曲线与Y-X直线相近,模型准确度良好。结论年龄、靶区周边剂量、最大肿瘤直径、KPS评分为复发高级别脑胶质瘤患者伽玛刀放疗预后的影响因素,基于以上因素构建的风险模型对于复发高级别脑胶质瘤患者伽玛刀放疗预后的预测价值较高,具有良好的临床应用价值。

替尼泊苷动脉化疗联合贝伐珠单抗在复发高级别脑胶质瘤的临床回顾性研究

目的:探索替尼泊苷超选动脉化疗联合贝伐珠单抗在复发高级别脑胶质瘤治疗的临床疗效和安全性。方法:79例复发高级别脑胶质瘤患者按治疗方法的不同,分为试验组37例(替尼泊苷动脉化疗联合贝伐珠单抗治疗)和对照组42例(贝伐珠单抗单药治疗),比较两组患者脑胶质瘤维持治疗后的客观缓解率、疾病控制率及不良反应率,评估O~6-甲基鸟嘌呤-DNA甲基转移酶基因启动子甲基化状态对两组患者疾病控制率的影响。结果:试验组和对照组的客观缓解率分别为43.2%和21.4%(P=0.038),疾病控制率分别为78.4%和54.8%(P=0.027)。试验组在轻度消化道反应(P=0.044)、头痛(P=0.044)及白细胞减少(P=0.026)的不良反应发生率高于对照组。试验组年龄小于60岁人群的疾病控制率较对照组明显增加(P<0.05)。结论:在高级别脑胶质瘤维持治疗中,替尼泊苷超选动脉化疗联合贝伐珠单抗的疗效优于贝伐珠单抗单药治疗,值得临床进一步推广。

贝伐珠单抗联合替莫唑胺用于复发性高级别脑胶质瘤的有效性及安全性分析

目的探讨贝伐珠单抗(bevacizumab,BEV)单用及贝伐珠单抗联合替莫唑胺(temozolomide,TMZ)治疗复发性高级别脑胶质瘤(high-grade glioma,HGG)的近期疗效、安全性及影响复发性高级别脑胶质瘤患者总生存期(overall survival,OS)的预后因素。方法按照脑胶质瘤治疗效果评估(response assessment in neuro oncology,RANO)标准,以客观有效率(objective response rate,ORR)、疾病控制率(disease control rate,DCR)为指标,回顾性分析云南省肿瘤医院2020年8月至2023年7月31例复发性HGG患者的临床病历资料,分为对照组(BEV)和治疗组(BEV+TMZ),评价2组近期疗效。采用Cox单因素和多因素分析方法分析组别(对照组与治疗组)、性别、年龄、疾病分级、入院评分、组织病理型分类等对31例复发性HGG患者OS的影响;通过χ^(2)检验比较2组不良反应(adverse reactions,ADR),评价安全性。结果治疗组ORR=63.16%,对照组ORR=16.67%,差异有统计学意义(χ^(2)=6.419,P=0.011);治疗组DCR=89.47%,对照组DCR=75.00%,DCR比较差异无统计学意义(χ^(2)=0.320,P=0.571)。对照组中位生存期(mOS)为7个月(95%CI:3.605~10.395),治疗组中位生存期(mOS)为14个月(95%CI:3.853~24.147),2组mOS差异无统计学意义(χ^(2)=0.829,P=0.363)。31例复发性HGG患者Cox单因素分析入院评分和组织病理型分类差异有统计学意义(P<0.05),多因素分析组织病理型分类差异有统计学意义(P<0.05)。2组治疗后ADR比较,恶心呕吐、乏力及腹泻,差异无统计学意义(P>0.05);血小板及白细胞降低率比较,差异有统计学意义(P<0.05),2组出现的ADR对症处理后均得到了缓解。结论治疗组治疗复发性HGG近期疗效优于对照组,2组治疗复发性HGG后的ADR可耐受,安全性良好。组织病理型分类可能是影响31例复发性HGG患者OS的预后因素。

DCE-MRI血流动力学参数在高、低级别胶质瘤鉴别中的应用及其与分子生物学标记物水平的相关性

目的:探讨动态增强磁共振成像(DCE-MRI)血流动力学参数在高、低级别胶质瘤鉴别中的应用,分析其与分子生物学标记物水平的相关性。方法:选取86例脑胶质瘤患者为研究对象。以病理结果作为金标准,按WHO肿瘤分类标准,将其分为低级别组(n=41)、高级别组(n=45),获得常规和动态增强MRI扫描参数数值,通过受试者工作特征曲线(ROC)分析DCE-MRI血流动力学参数对高、低级别胶质瘤的鉴别价值,Pearson分析各血流动力学参数与癌组织分子生物学标志物的相关性。结果:高级别组DCE-MRI血流动力学参数Ktrans、Kep、Ve水平均高于低级别组(P<0.05);高级别组与低级别组Vp水平比较,差异无统计学意义(P>0.05);DCE-MRI血流动力学参数Ktrans、Kep、Ve联合检测鉴别高、低级别脑胶质瘤ROC曲线下面积(AUC)为0.927,高于单独检测AUC(0.822、0.803、0.785),敏感度为91.11%、特异度为80.49%(P<0.05);高级别组脑胶质瘤分子生物学标记物VEGF mRNA、Ki-67 mRNA表达水平高于低级别组(P<0.05);Pearson相关性分析显示,脑胶质瘤DCE-MRI血流动力学参数Ktrans、Kep、Ve水平与癌组织VEGF mRNA、Ki-67 mRNA表达水平正相关(r=0.522、0.415、0.323、0.483、0.376、0.274,P<0.05)。结论:高级别脑胶质瘤DCE-MRI血流动力学参数Ktrans、Kep、Ve水平均高于低级别胶质瘤,且与癌组织分子生物学标记物VEGF、Ki-67表达水平正相关,可用于临床高、低级别脑胶质瘤鉴别。

MRI表观扩散系数在脑胶质瘤分级和IDH1基因分型中的临床意义

目的探讨MRI表观扩散系数(ADC)在脑胶质瘤分级和异柠檬酸脱氢酶1(IDH1)基因分型中的临床意义。方法回顾性收集脑胶质瘤患者60例,比较不同分级、不同IDH1基因型脑胶质瘤的ADC。ROC曲线分析ADC诊断不同分级脑胶质瘤的效能。结果与低级别脑胶质瘤患者比较,高级别脑胶质瘤患者最小ADC、平均ADC、相对最小ADC、相对平均ADC显著降低(P<0.05);而不同IDH1基因型脑胶质瘤患者上述指标比较差异无显著性(P>0.05)。ROC曲线分析结果显示,ADC对脑胶质瘤分级具有良好的诊断价值(P<0.05)。结论ADC对脑胶质瘤分级具有良好的诊断价值。

脑干胶质瘤病理学分级预测因素及与APT成像的关系研究

目的:探讨脑干胶质瘤病理学分级的预测因素及与酰胺质子转移(amide proton transfer,APT)成像的关系,旨在为高级别胶质瘤患者早期诊断识别及后续预测模型构建提供借鉴。方法:回顾并纳入2019年1月—2023年1月于第九〇九医院行手术治疗并接受APT成像检查的脑干胶质瘤患者79例,根据病理学分级标准分为高级别组(38例)和低级别组(41例);采用单因素分析和多因素logistic回归分析评价脑干胶质瘤病理学分级的独立预测因素,并分析脑干胶质瘤病理学分级预测因素的预测效能。结果:单因素分析结果显示,囊性病变、病灶最大径、APT成像信号强度平均值及最大值均可能与脑干胶质瘤病理学分级相关(P<0.05);多因素logistic分析结果显示,囊性病变、病灶最大径≥2 cm、APT成像信号强度平均值及最大值均是脑干胶质瘤病理学分级的独立预测因素(P<0.05)。利用囊性病变、病灶最大径≥2 cm、APT成像信号强度平均值、APT成像信号强度最大值及logistic模型预测概率对脑干胶质瘤病理学分级情况进行预测,最佳截断值分别为0.50、0.50、2.95%、4.11%、37.85%,约登指数分别为38.19%、44.42%、51.73%、42.17%、65.28%。结论:囊性病变、病灶最大径与APT成像信号强度可作为脑干胶质瘤病理学分级的独立预测因素,且APT成像信号强度平均值具有更佳的预测效能。