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Medulloblastoma is the most common malignant brain tumor of childhood. Surgery, radiation therapy, and chemotherapy successfully cure many patients, but survivors can suffer long-term toxicities affecting their neurocognitive and growth potential; furthermore, there is no curative therapy in up to 30% of cases, mainly because of our incomplete understanding of many of the underlying molecular and cellular processes. Angiogenesis is a hallmark of the progression of medulloblastoma and, over the last years, investigators have sought to develop effective and less toxic antiangiogenic strategies, including the inhibition or destruction of abnormal blood vessels using either antiangiogenic or vascular disrupting agents. However, the results are conflicting principally because of the complex biology of tumor vasculature and the irregular geometry of the vascular system in real space. In addition, current targets of antiangiogenic therapy, such as vascular endothelial growth factor (VEGF), are thought to be critical for both physiologic and pathologic angiogenesis, and clinical side effects of anti-VEGF therapy are beginning to emerge. We here review the state-of-the-art concerning antiangiogenic targets for medulloblastoma treatment, and discuss the complexity of the vascular system that intrinsically limits the efficacy of current strategies. 相似文献
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Takotsubo Cardiomyopathy and Betablockers: “On the Wall of the Cave,Only the Shadows are True” 下载免费PDF全文
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Hussein Fathalla Antonio Di Ieva John Lee Jennifer Anderson Rowan Jing Michael Solarski Michael D. Cusimano 《Neurosurgical review》2017,40(2):309-318
Following extended endoscopic transsphenoidal approach (EETSA), cerebrospinal fluid (CSF) leak rate has been reported in the range of 5–50 %. Novel closure techniques, such as the nasoseptal flap and other multilayered repairs improved the outcomes significantly but took most of our focus. Little attention, however, was given to other aspects of the equation such as nasal support—to support the heavy weight of such repairs—and lumbar drains. These are important because they diminish the forces acting on both sides of the repair, hence covering all the angles. We reviewed data of 98 consecutive patients who underwent an EETSA between 1999 and 2014. We analyzed the rates of CSF leak throughout the years and with every modification added to our closure technique. Common pathologies encountered were invasive adenomas, meningiomas, chordomas, and craniopharyngiomas. CSF leak occurred overall in five patients (5.1 %). The nasoseptal flap decreased the rate of CSF leak but not significantly (P = 0.112), while placing a nasal trumpet to support our repair resulted in significant decrease in CSF leak rate (P = 0.0013). In the last 2 years of our series, when all modifications took place and all angles were covered, there was one leak in 35 cases (2.8 %). A protocol that covers all the angles by a good multilayered repair (regardless of its type and materials) while diminishing the forces acting on both sides of the repair leads to a minimal rate of CSF leak. No principle alone is effective individually. 相似文献
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Ieva Kurilova Regina G.H. Beets-Tan Jessica Flynn Mithat Gönen Gary Ulaner Elena N. Petre F. Edward Boas Etay Ziv Hooman Yarmohammadi Elisabeth G. Klompenhouwer Andrea Cercek Nancy A. Kemeny Constantinos T. Sofocleous 《Clinical colorectal cancer》2019,18(1):8-18
Introduction
The purpose of this study was to identify predictors of overall (OS) and liver progression-free survival (LPFS) following Yttrium-90 radioembolization (RAE) of heavily pretreated patients with colorectal cancer liver metastases (CLM), as well as to create and validate a predictive nomogram for OS.Materials and Methods
Metabolic, anatomic, laboratory, pathologic, genetic, primary disease, and procedure-related factors, as well as pre- and post-RAE therapies in 103 patients with CLM treated with RAE from September 15, 2009 to March 21, 2017 were analyzed. LPFS was defined by Response Evaluation Criteria In Solid Tumors 1.1 and European Organization for Research and Treatment of Cancer criteria. Prognosticators of OS and LPFS were selected using univariate Cox regression, adjusted for clustering and competing risk analysis (for LPFS), and subsequently tested in multivariate analysis (MVA). The nomogram was built using R statistical software and internally validated using bootstrap resampling.Results
Patients received RAE at a median of 30.9 months (range, 3.4-161.7 months) after detection of CLM. The median OS and LPFS were 11.3 months (95% confidence interval, 7.9-15.1 months) and 4 months (95% confidence interval, 3.3-4.8 months), respectively. Of the 40 parameters tested, 6 were independently associated with OS in MVA. These baseline parameters included number of extrahepatic disease sites (P < .001), carcinoembryonic antigen (P < .001), albumin (P = .005), alanine aminotransferase level (P < .001), tumor differentiation level (P < .001), and the sum of the 2 largest tumor diameters (P < .001). The 1-year OS of patients with total points of < 25 versus > 80 was 90% and 10%, respectively. Bootstrap resampling showed good discrimination (optimism corrected c-index = 0.745) and calibration (mean absolute prediction error = 0.299) of the nomogram. Only baseline maximum standardized uptake value was significant in MVA for LPFS prediction (P < .001; SHR = 1.06).Conclusion
The developed nomogram included 6 pre-RAE parameters and provided good prediction of survival post-RAE in heavily pretreated patients. Baseline maximum standardized uptake value was the single significant predictor of LPFS. 相似文献60.
鸭子α-干扰素基因表达及多样性分析 总被引:5,自引:0,他引:5
目的:采用分子杂交及PCR方法,分析鸭α-干扰素基因的表达及多态性。方法:从鸭外周血分离出的单核细胞在体外经PHA(5ug/ml)刺激不同时间后,提取总RNA。以RT-PCR方法检测鸭α-干扰素(DuIFN-α)mRNA表达状况。引物根据最近公布的DuIFN-α基因序列设计。从鸭外周血单核细胞中提取的基因组DNA经限制性内切酶BamHI,HindⅢ,PstI,XbaI消化后,以公布的DuIFN-α序列为探针,采用Southern杂交分析DuIFN-α基因的多样性。结果:在未经PHA刺激的鸭外周血单核细胞(PBMCs)中,未检测到DuIFN-α表达;PHA刺激4h后,即可检测到DuIFN-α表达,一直持续到24h,基因组DNA限制性内切酶多态性分析表明,PstI酶切后,出现片段大小各异的杂交信号,提示DuIFN- 相似文献