Phylogenetic Analysis of Citrus tristeza virus Isolates of Wild Type Citrus in China

The genetic variation and phylogenetic relationships of Citrus tristeza virus （CTV） isolates collected from Chinese wild type citrus were analyzed by comparing the sequences of nine genomic regions （p23, p20, p13, p18, p25, p27, POL, HEL and k17） with the CTV isolates of cultivated citrus from different countries. The results showed that the divergence pattern of genomic RNA of the CTV isolates from wild type citrus was similar to that of other isolates from cultivated citrus, the 3′ proximal region was relatively conserved, and the 5′ proximal region had greater variability. The nine genomic regions of CTV isolates analyzed were found to have been under purifying selection in the evolution process. Phylogenetic analysis showed that the eleven Chinese wild CTV isolates were located at different clades and did not relfect their geographical origins, suggesting genetic diversity among the Chinese wild CTV populations. These results will aid in the understanding of molecular evolution of the Chinese CTV populations.

Changes in gene-expression profiles of colon carcinoma cells induced by wild type K-ras2

AIM: To further elucidate the possible molecular biological activity of wild type K-ras2 gene by detecting changes in wild type K-ras2 gene-induced gene-expression profiles of colon carcinoma cells using cDNA microarray techniques. METHODS: Total RNA was isolated from peripheral blood of health volunteers. Reverse transcription of RNA and polymerase chain reaction were used to synthesize wild type K-ras2 cDNA. K-ras2 cDNA fragment was cloned into a T easy vector and sequenced. A eukaryotic expression vector pCI-neo-K-ras2 was constructed and transfected to Caco2 cell line using the liposome method. Finally, mRNA was isolated, reverse-transcribed to cDNA from pCI-neo-K-ras2 or pCI-neo blank vector-transfected Caco cells, and analyzed by cDNA microarray assay. RESULTS: Restriction enzyme analysis and DNA sequencing verified that the constructed expression vector was accurate. High-quality RNA was extracted and reverse transcribed to cDNA for microarray assay. Among the 135 genes, the expression was up-regulated in 24 and down-regulated in 121. All these differentially expressed genes were related to cell proliferation, differentiation, apoptosis and signal transduction. CONCLUSION: Differentially expressed genes can be successfully screened from wild type K-ras2-transfected colon carcinoma cells using microarray techniques. The results of our study suggest that wild type K-ras2 is related to the negative regulation of cell proliferation, metabolism and transcriptional control, and provide new clues to the further elucidation of its possible biological activity.

Morphological Characteristics and Nutritional Values of Wild Types of Sago Mushrooms (<i>Volvariella</i>sp.) That Growth Naturally in Manokwari, West Papua

Sago mushrooms (SMs) are an edible fungus that is favorite food for community in Papua and West Papua, Indonesia in particular. This work aims to determine the morphological characteristics and nutritional value of SMs growing naturally in Manokwari. Morphological characteristic of SMs that grows wild in Manokwari has an average of pileus diameter 9.53 cm, pileus weight 21.53 grams, and pileus color. The pileus color is divided into three colors: outer circle color is RHS163D, middle circle color is RHS199B, and inner circle color is RHS199A. Average of stipe diameter, length, and weight is 1.00 cm, 10.43 cm, and 9.15 gram respectively. Stipe is a yellowish white color (RHS155B). SMs nutrient content that grows naturally in Manokwari is potassium 1394.02 milli-grams and calcium 13.37 milligrams per 1000 grams fresh weight. The others nutrient contents of SMs that are measured are fat 1.01 grams, protein 1.30 grams, carbohydrates 0.18 grams, phosphorus 0.34 milligrams, and energy 15.01 kilocalories per 100 grams of fresh weight.

Oral Vinorelbine as Switch Maintenance Therapy versus Best Supportive Care in Patients with Advanced Adenocarcinoma Non-Small Cell Lung Cancer EGFR Wild Type

Background: This study was performed to evaluate the efficacy and safety of switch maintenance therapy with oral vinorelbine in advanced non-small cell lung cancer (NSCLC) with adenocarcinoma limited to epidermal growth factor receptor (EGFR) wild type. Materials and Methods: In this single randomized trial, patients with advanced stage (IIIB and IV) NSCLC with adenocarcinoma EGFR wild-type status, treated with 6 cycles of platinum based chemotherapy. Patients did not show progression after first-line chemotherapy were randomly assigned to receive switch maintenance with vinorelbine (80 mg/m2, day 1, 8) (group I) or the best supportive care until disease progression (group II). Results: The median progression free survival (PFS) was 9.7 months for group I versus 5.7 months for group II with statistically significant difference between both groups [HR = 1.15;95% CI 1.19 to 1.49;P value = 0.002], while the median overall survival (OS) was 13.2 months for group I versus 11.9 months for group II with no statistically significant differences between both groups [HR = 1.24;95% CI 1.05 to 1.46;P value = 0. 3]. The patients who received oral vinorelbine had tolerable toxicity profile. Conclusion: Switch maintenance therapy with oral vinorelbine, though improve PFS, did not improve OS in patients with NSCLC with adenocarcinoma EGFR wild type.

KIT and platelet-derived growth factor receptor α wild-type gastrointestinal stromal tumor associated with neurofibromatosis type 1: Two case reports

BACKGROUND Gastrointestinal stromal tumors(GISTs) associated with neurofibromatosis are uncommon compared to their gastrointestinal counterparts. Patients with neurofibromatosis type 1(NF-1) have an increased risk of developing gastrointestinal tumors, including rare types such as GIST.CASE SUMMARY A 60-year-old male Chinese patient was diagnosed with NF-1 10 years ago and presented with upper abdominal discomfort and black stools. Endoscopic ultrasonography and an enhanced abdominal computed tomography scan revealed a mass located 4 cm from the muscular layer of the descending duodenum. A 59-year-old Chinese woman who was diagnosed with NF-1 25 years ago presented with sudden unconsciousness and black stools. Multiple masses in the duodenum were noted by echogastroscopy and an enhanced abdominal computed tomography scan. Both patients presented with cutaneous neurofibromas. The histologic examination of tumors from both patients revealed spindle cells and low mitotic activity. Immunohistochemically, the tumor cells showed strong positivity for KIT(CD117), DOG-1, CD34, and Dehydrogenase Complex Subunit B, and negativity for SMA, desmin, S-100, and β-catenin. None of the six tumors from two patients had KIT exon 9, 11, 13, or 17 or platelet-derived growth factor receptor α exon 12 or 18 mutation, which is a typical finding for sporadic GISTs. None of the six tumors from the two patients had a BRAFV600 E mutation. The patients were alive and well during the follow-up period(range:0.6-5 yr).CONCLUSION There have been only a few previous reports of GISTs associated with NF-1.Although GISTs associated with NF-1 have morphologic and immunohistochemical similarities with GISTs, the pathogenesis, incidence,genetic background, and prognosis are not completely known. A medical history of NF-1 in a patient who has gastrointestinal bleeding or anemia and an intraabdominal mass with nonspecific computed tomography features may help in diagnosing GIST by virtue of the well-known association of these two entities.Molecular genetic studies of cases indicated that GISTs in NF-1 patients have a different pathogenesis than sporadic GISTs.

Reversal of Multidrug Resistance and Inhibition of Phosphorylation of AKT in Human Ovarian Cancer Cell Line by Wild-type PTEN Gene

The reversing effect of wild-type PTEN gene on resistance of C 13K cells to cisplatin and its inhibitory effect on the phosphorylation of protein kinase B （AKT） were studied. The expression of PTEN mRNA and protein in OV2008 cells and C13K cells were semi-quantitatively detected by using RT-PCR and Western blotting. Recombinant eukaryotic expression plasmid containing human wild-type PTEN gene was transfected into C13K cells by lipofectamine2000. The expression of PTEN mRNA was monitored by RT-PCR and the expression of PTEN, Akt, p-Akt protein were ana- lyzed by Western blotting in PTEN-transfected and non-transfected C13K cells. Proliferation and chemosensitivity of cells to DDP were measured by MTT, and cell apoptosis was detected by flow cytometry after treatment with cisplatin. The expression of PTEN mRNA and protein in OV2008 cells were significantly higher than those in C13K cells. After transfection with PTEN gene for 48 h, the expression of PTEN mRNA and protein in C 13K cells were 2.04 ± 0.10, 0.94± 0.04 respectively and the expression of p-Akt protein （ 0.94± 0.07） was lower than those in control groups （1.68 ±0.14, 1.66± 0.10） （P〈 0.05）. The IC50 of DDP to C 13 K cells transfected with PTEN （7.2± 0.3 la mol/L） was obviously lower than those of empty-vector transfected cells and non-transfected cells （12.7±0.4 lamol/1, 13.0±0.3 lamol/L） （P〈0.05）. The apopototis ratio of wild-type PTEN-transfected, empty vector transfected and non-transfected C13K cells were （41.65___0.87）%, （18.61 ±0.70）% and （15.28±0.80）% respectively, and the difference was statistically significant （P〈0.05）. PTEN gene plays an important role in ovarian cancer multidrug resistance. Transfection of PTEN could increase the expression of PTEN and restore drug sensitivity to cisplatin in human ovarian cancer cell line C 13K with multidrug-resistance by decreasing the expression of p-Akt.

pH-Dependence of Manganese (II) Oxidation Reaction by Novel Wild-Type and Mutants Recombinant Phlebia radiata Manganese Peroxidase 3 (rPr-MnP3) Enzymes

The goal of this study was to determine whether mutation of the Mn-binding site of wild-type recombinant Phlebia radiata manganese peroxidase 3 affected the pH-dependence kinetic parameters. pH range investigated was 2.5 – 12.0. The catalytic efficiency of the mutant enzymes at high and low pH in comparison to the wild-type was investigated using standard rPr-MnP3 protocol. Wild-type recombinant Phlebia radiata MnP3 enzyme showed optimal activity with Mn (II) as substrate at pH 5.0 and remained moderately active (approximately 40%) in the pH range of 6.0 - 9.0. The rPr-MnP3 mutants’ maximum activity ranged between 5.5 and 8.0. Wild-type and mutants rPr-MnP3 enzymes exhibited a similar pH profile with optimum pH of 3.0 for ABTS oxidation. Mutation has severely decreased the catalytic efficiency for Mn (II) oxidation at pH 5.0. The rPr-MnP3 enzymes showed enhanced affinity for Mn (II) at alkaline pH and a more alkaline range for catalysis than ever reported for any Manganese Peroxidase. This study reveals that at higher pH, rPr-MnP3 can function with alternative ligands in the Mn (II) site and does not have an absolutely obligate requirement for an all carboxylate ligand set. These results further strongly confirm that Mn2+ binding site is the only productive catalytic site for Mn (II) oxidation.

Case Report: Long-Term Survival in Patient with Cirrhosis of the Liver and Colon Cancer K-ras Wild-Type

K-ras wild-type carcinoma is a tumour that is sensitive to treatment with anti-cancer and anti-EGFR drugs: the combination of Cetuximab and Panitumumab with chemotherapy (Cetuximab) or as a single therapy (Panitumumab). Case Report: The clinical case presented here refers to a 68-year-old patient who had been diagnosed with adenocarcinoma of the recto sigmoid with pelvic recurrence three years after surgery. The patient had a severe co-morbidity: correlated B-type liver cirrhosis. First-line chemotherapy was begun with Oxaliplatin plus Capecitabine (CAPOXI) following a relapse, and this continued for six months (six cycles), when the treatment was interrupted because of the disease’s progression and hematological and gastrointestinal toxicity. Following an assessment of the K-ras, diagnosed as wild type, the patient was excluded from second-line chemotherapy treatment because of decompensated cirrhosis and the persistence of thrombocytopenia and leukopenia. The patient was put forward for biological treatment with an anti-EGFR monoclonal antibody (Panitumumab). Panitumumab was administered at a dosage of 6 mg/kg every 2 weeks for 17 months;the treatment was well tolerated, despite the cirrhosis, and the main toxicity was the skin rash. Conclusion: In patients with severe comorbidities such as cirrhosis of the liver and K-ras wild-type carcinomas, therapy with a monoclonal antibody such as Panitumumab is a treatment that is well tolerated, with few serious toxic side-effects;it also offers advantages in terms of survival and clinical benefits.

Adaptive Response of Wild and Mutant Type Synechococcus cedrorum to a Polychlorinated Pesticide-Endosulfan

The effect of endosulfan, a hexachlorinated pesticide, on growth, inorganic nitrogenous nutrient uptake (NO3-, NO2- and NH4+), change in pigmentation and glycogen content on wild type and chemically mutagenised cells of Synechococcus cedrorum was investigated. The pattern of response to pesticide stress in wild and mutant type was the same. Growth reappeared in both after a period of initial lag in presence of endosulfan. The duration of lag increased with increasing doses of pesticide. Paradoxically, however, the rate of uptake of NO-3, NO-2 and NH+4 pigment and glycogen content progressively increased with increasing doses. The difference in the adaptation response between wild and mutant types was observed only in the concentration of pesticide that could be tolerated; with the mutant tolerating 2.5 fold more.

Therapeutic strategies targeting the epidermal growth factor receptor signaling pathway in metastatic colorectal cancer

More than 1.9 million new colorectal cancer(CRC)cases and 935000 deaths were estimated to occur worldwide in 2020,representing about one in ten cancer cases and deaths.Overall,colorectal ranks third in incidence,but second in mortality.More than half of the patients are in advanced stages at diagnosis.Treatment options are complex because of the heterogeneity of the patient population,including different molecular subtypes.Treatments have included conventional fluorouracil-based chemotherapy,targeted therapy,immunotherapy,etc.In recent years,with the development of genetic testing technology,more and more targeted drugs have been applied to the treatment of CRC,which has further prolonged the survival of metastatic CRC patients.

Successful cetuximab rechallenge in metastatic colorectal cancer:A case report

BACKGROUND Metastatic colorectal cancer(mCRC)treatment has been evolving and increasingly driven by tumor biology and gene expression analysis.Rechallenge with epidermal growth factor receptor(EGFR)inhibitors(anti-EGFR)represents a promising strategy for patients with RAS wild-type(RAS-wt)mCRC and circulating tumor DNA has emerged as a potential selection strategy.Herein,we report the case of a RAS-wt mCRC patient who had a successful response to cetuximab rechallenge.CASE SUMMARY Our patient was diagnosed with stage IV RAS-wt,microsatellite-stable rectosigmoid junction adenocarcinoma.He was started on first-line treatment with FOLFIRI and cetuximab and achieved partial response,allowing for a left hepatectomy(R0),followed by post-operative chemotherapy and an anterior resection;progression-free survival(PFS)of 16 months was obtained.Due to hepatic and nodal relapse,second-line treatment with FOLFOX and bevacizumab was started with partial response;metastasectomy was performed(R0),achieving a PFS of 11 months.After a 15 months anti-EGFR-free interval,FOLFIRI and cetuximab were reintroduced upon disease progression,again with partial response and a PFS of 16 months.Following extensive hepatic relapse,cetuximab was reintroduced and a marked clinical and analytical improvement was seen,after only one cycle.RASwt status was confirmed on circulating tumor DNA.The patient’s overall survival exceeded 5 years.CONCLUSION Our case provides real-world data to support cetuximab rechallenge in later lines of RAS-wt mCRC treatment.

UE参数、S-TK1、AG490、WIP1诊断TC

目的:探究UE参数、S-TK1、AG490、WIP1对甲状腺癌(TC)的诊断价值。方法:选择我院收治TC患者102例(TC组)和同期收治甲状腺结节良性患者73例(对照组)。比较两组UE参数、S-TK1、AG490、WIP1,分析各指标对TC的诊断价值。结果:TC组的弹性评分、SR值、S-TK1、WIP1水平均高于对照组,AG490低于对照组(P<0.05);ROC曲线分析发现五项指标联合诊断TC的AUC最高(P<0.05)。结论:UE参数与S-TK1、WIP1、AG490联合检测有利于临床诊断TC。

卡瑞利珠单抗联合培美曲塞和奈达铂治疗EGFR/ALK野生型晚期非鳞状NSCLC的临床观察

目的观察卡瑞利珠单抗联合培美曲塞和奈达铂治疗表皮生长因子受体(EGFR)和间变性淋巴瘤激酶(ALK)野生型晚期非鳞状非小细胞肺癌(NSCLC)的疗效和安全性。方法回顾性收集2021年8月至2023年5月于重庆医科大学附属第一医院就诊的92例EGFR/ALK野生型晚期非鳞状NSCLC患者资料,根据治疗方案的不同分为奈达铂组(46例)和卡铂组(46例)。奈达铂组患者给予注射用卡瑞利珠单抗+注射用奈达铂+注射用培美曲塞二钠;卡铂组患者给予注射用卡瑞利珠单抗+卡铂注射液+注射用培美曲塞二钠。两组均以21 d为1个周期,所有患者至少完成2个周期的治疗。观察两组患者的近期疗效和不良反应发生情况,分析影响患者无进展生存期(PFS)的因素。结果两组患者的客观缓解率、疾病控制率、中位PFS、3~5级治疗相关不良事件(TRAE)发生率比较,差异均无统计学意义(P>0.05)。奈达铂组患者的1~2级肾脏和泌尿系统TRAE、心慌、心包积液发生率均显著低于卡铂,恶心、呕吐和食欲降低发生率显著高于卡铂组(P<0.05)。患者的性别、年龄、有无吸烟史、美国东部肿瘤协作组织评分和TNM分期均不是影响患者PFS的因素(P>0.05)。结论卡瑞利珠单抗联合培美曲塞和奈达铂治疗EGFR/ALK野生型晚期非鳞状NSCLC的疗效显著,安全性较好。

Neuritin野生型蛋白的制备及活性、稳定性的检测及分析

目的制备符合药典结构要求的无标签Neuritin野生型(wild type,WT)蛋白,并完成其存在形式、活性及稳定性鉴定及分析。方法利用基因重组技术构建符合药典结构要求的Neuritin WT酵母重组子,利用SDS-PAGE还原电泳及Western blot对其进行高表达筛选及鉴定;摸索建立无标签Neuritin WT蛋白纯化方法,对纯化后的蛋白进行SDS-PAGE还原电泳分子量鉴定、Western blot免疫原性鉴定、SEC-HPLC精细鉴定及宿主DNA、宿主蛋白残留量检测;利用SDS-PAGE非还原电泳完成存在形式的鉴定;通过参照药典建立的重组Neuritin蛋白活性鉴定方法,检测并分析Neuritin WT纯化蛋白的活性,并观察37℃下不同时间Neuritin WT纯化蛋白的稳定性。结果制备了纯度高达98%以上的Neuritin WT纯化蛋白,蛋白相对分子质量为9.7 kDa,宿主DNA残留量为0.0094 ng/剂,宿主蛋白残留量占比0.0008%;经检测,该纯化蛋白存在单体、二聚体2种形式。活性鉴定结果表明该蛋白具有维持神经元存活的生物学活性;且37℃下3 d内降解率小于10%、7 d内未到达半衰期(蛋白降解率小于35%)。结论成功制备了纯度高达98%、杂质含量及结构符合药典要求的无标签Neuritin WT蛋白,分析了Neuritin WT蛋白的存在形式,并明确了该蛋白具有较好的生物学活性及稳定性,为Neuritin进一步功能、药学研究及生物制品的研制提供了物质基础。

RAS野生型转移性结直肠癌抗表皮生长因子受体单抗维持治疗中国专家共识(2024版)

对于接受标准一线治疗达到疾病控制的转移性结直肠癌(mCRC),后续治疗策略的制订应在维持疗效的同时注重改善患者生活质量。化疗联合抗表皮生长因子受体(EGFR)单抗是RAS野生型mCRC患者的标准一线治疗方案。当一线含抗EGFR单抗诱导治疗达到最佳疗效、且处于疾病缓解或稳定状态时,含抗EGFR单抗维持治疗方案可在维持疗效获益的同时,降低毒副反应和提高患者生活质量。本共识基于循证医学和临床实践,进一步明确抗EGFR单抗维持治疗的应用时机、方案选择、不良反应管理和后续策略选择,为抗EGFR单抗维持治疗提供临床应用规范化标准和指导,以期使患者的治疗最大化获益。

水疱性口炎病毒对小鼠乳腺癌4T1细胞荷瘤小鼠抗肿瘤免疫、移植瘤生长与肺转移的影响

目的:探究野生型水疱性口炎病毒印第安纳株(VSV-IN)对小鼠三阴性乳腺癌4T1细胞移植模型小鼠的免疫调节及肿瘤转移的影响。方法:VSV以MOI=1、MOI=10、MOI=100感染4T1细胞12、24、48 h后,CCK-8法检测4T1细胞死亡率,划痕愈合实验检测细胞迁移能力,qPCR检测细胞中E-cadherin、MMP-2、MMP-9 mRNA的表达。于雌性BALB/c小鼠脂肪垫接种1×10^(6)个/mL的4T1细胞0.1 mL,构建4T1细胞荷瘤小鼠模型,待小鼠肿瘤体积达200 mm3,分别向移植瘤内注射PBS、紫杉醇(TAX)(15 mg/kg)、VSV-IN(1×10^(6)pfu/只),每周1次。给药4次后,处死小鼠、剥离完整移植瘤组织,测量肿瘤体积及质量,肺组织病理切片经H-E染色后观察肿瘤肺部转移结节,流式细胞术检测脾组织中T细胞亚群比例,ELISA法检测小鼠血清IL-6及TNF-α水平,利用GEPIA在线分析乳腺肿中迁移相关蛋白mRNA的表达,免疫组化法检测肿瘤中MMP-2、MMP-9与E-cadherin的表达,利用蛋白-蛋白对接技术预测VSV-IN的G蛋白、M蛋白与ERK2、E-cadherin的亲和力。结果:经MOI=10、100的VSV-IN处理48 h后,4T1细胞死亡率显著高于对照组(均P<0.01);与对照组相比,VSV-IN组(MOI=10)细胞迁移率明显降低(P<0.01),MMP-9 mRNA的相对表达量明显降低(P<0.05);与对照组小鼠相比,VSV-IN组移植瘤生长较对照组减缓且终点体积显著减小(P<0.05),VSV-IN组小鼠肺转移结节数量显著减少[(12.86±1.86)vs(24±3.67)个,P<0.01],脾内CD4^(+)T、CD8^(+)T细胞比例显著升高(均P<0.05),血清TNF-α、IL-6含量显著升高(均P<0.01);GEPIA分析发现在乳腺癌中E-cadherin、MMP-9表达水平均高于癌旁组织(P<0.05);VSV-IN组小鼠肿瘤细胞内MMP-9表达明显低于对照组(P<0.05);VSV-IN的G、M蛋白与ERK2的结合自由能分别为–11.7 kcal/mol、–6.4 kcal/mol。结论:野生型VSV-IN可抑制4T1细胞荷瘤小鼠的移植瘤生长及转移,这可能与其促进抗肿瘤免疫及调控迁移相关蛋白表达有关。

Genetic Evolution Analysis on Wild Isolates of Citrus Tristeza Virus Originated in China Based on Coat Protein Genes Sequences

The coat protein （CP） genes were cloned and sequenced from viral particles of 11 isolates of citrus tristeza virus （CTV） collected from wild citrus plants in China and 4 Chinese isolates from cultivated sweet orange and pummelo varieties, respectively. By analyzing and comparing the nucleotide and amino acid sequences of CP genes, the 11 wild CTV isolates were found over 92% identical with 4 Chinese CTV isolates and 21 exotic CTV isolates from cultivated citrus. From 91 to 100% of the CTV CP gene sequences in wild type citrus plants were generally well conserved. Genetic evolution analysis indicated that the GC% of the CP gene was less than AT%, and more transition were found in the CP genes than transversion with the transition/transversion ratio ranging from 6.3 to 7.0 among species. The substitution frequency was the highest at the third codon, followed by the first and second codon. The ratio of non-synonymous mutations （du） to synonymous mutations （ds） was far lower than 1, suggesting that the CP gene might have experienced purifying selection in the evolution. Phylogenetic analysis revealed that the 11 CTV isolates in Chinese wild type citrus belonged to different phylogenetic clusters, and shared higher homology and closer relationships with other cultivated citrus CTV isolates from different countries, which indicated complicated genetic relationships among the CTV isolates. In addition, CTV isolates with similar biological characteristics usually located into the same clusters. Therefore, the conclusion was drawn that pathogenicity was critical to evolution and origin of CTV.

低级别胶质瘤异柠檬酸脱氢酶-1基因分型与磁共振表观弥散系数、血管内皮生长因子表达的关系

目的探讨低级别胶质瘤病人异柠檬酸脱氢酶-1(IDH-1)基因分型与磁共振表观弥散系数(ADC)、血管内皮生长因子(VEGF)表达的关系。方法纳入新疆医科大学附属肿瘤医院2021年6月至2023年5月收治的低级别脑胶质瘤病人52例开展回顾性研究,病人术前均接受磁共振弥散加权成像检查,经手术病理与WHO中枢神经系统肿瘤分级标准证实为低级别脑胶质瘤,根据IDH-1分型结果分成突变型组29例、野生型组23例。比较两组最小ADC值(ADC_(min))、平均ADC值(ADC_(mean))、最小相对ADC值(rADC_(min))、平均相对ADC值(rADC_(mean))。绘制受试者操作特征曲线(ROC曲线)分析ADC值对IDH-1分型的鉴别价值。分析病人IDH-1分型与VEGF表达的关系,比较不同VEGF表达病人的ADC值。结果突变型组ADC_(min)、ADC_(mean)、rADC_(min)、rADC_(mean)较野生型组增高(P<0.05)。ADC_(min)、ADC_(mean)、rADC_(min)、rADC_(mean)鉴别IDH-1分型的曲线下面积(AUC)分别为0.77(灵敏度75.86%,特异度73.91%)、0.79(灵敏度82.76%,特异度78.26%)、0.76(灵敏度79.31%,特异度78.26%)、0.77(灵敏度79.31%,特异度82.61%)。突变型组VEGF阳性率为13.79%,低于野生型组的47.83%(P<0.05)。VEGF阴性/弱阳性组ADC_(min)、ADC_(mean)、rADC_(min)、rADC_(mean)高于阳性组(P<0.05)。结论低级别脑胶质瘤IDH-1突变者的ADC_(min)、ADC_(mean)、rADC_(min)、rADC_(mean)相对高,ADC参数对其IDH-1分型具有鉴别价值,且IDH-1分型与VEGF表达相关。

基于机器学习方法构建IDH野生型胶质母细胞瘤预测模型研究

目的建立异柠檬酸脱氢酶(IDH)野生型胶质母细胞瘤生存概率的列线图模型及随机生存森林模型。方法回顾性分析2017年1月—2020年12月在空军军医大学附属西京医院手术治疗的127例IDH野生型胶质母细胞瘤患者临床资料,进行预后因素分析并建立列线图模型及随机生存森林模型,通过C指数,校准曲线,决策曲线评价模型的区分度,校准度以及临床净获益率。结果使用Cox比例风险模型进行多因素分析发现,患者术前卡氏功能状态评分(KPS)、是否接受同步放化疗、年龄、O^(6)-甲基鸟嘌呤甲基转移酶(MGMT)蛋白表达,是独立的预后因素(P<0.05)。通过Cox回归模型建立列线图预测模型;通过R软件建立随机生存森林模型,两个模型均具有良好的区分度和校准度,随机生存森林模型的临床净获益优于列线图模型。结论建立的列线图模型及随机生存森林模型有助于临床医生判断患者特定时间点的生存概率。

广东省封开县野生林木种质资源调查研究

基于广东省林木种质资源项目,采用样线、样方的实地调查方式,确定封开县野生林木资源情况,进而对其物种组成、地理区系特点、资源利用方式等进行研究。结果表明:封开县有野生林木种质资源83科209属380种,其中蕨类植物1科1属1种,裸子植物1科1属2种,被子植物81科207属377种;根据封开县野生林木科属种的地理区系分析结果,其林木种质资源区系以热带成分占据优势地位,呈现出明显的热带-亚热带属性;此外,根据植物资源用途将封开县野生林木种质资源分为药用、观赏、材用、食用等15种类型,其中药用植物资源最丰富。封开县林木种质资源丰富,资源利用类型多样,建议当地结合生产实际,合理开发利用林木种质资源,深度挖掘林木种质资源的药用、材用、观赏等价值,促进封开县野生林木种质资源的可持续发展。