1,720,958 research outputs found
Late Relapse of Botryoid Embryonal Rhabdomyosarcoma of the Vagina in Prepubertal Age
No full text[No abstract available
Congenital Stage 1 Neuroblastoma Evolved Into Stage 4s
No full textA newborn with a prenatally detected adrenal mass underwent complete resection of it Stage 1 favorable histology neuroblastoma (NB) without MYC-N amplification. Two months later. the infant presented with a local recurrence and multiple hepatic metastases. Close follow-up without therapy was adopted for stage 4s NB. Enlarging tumor lesions were seen until the child was S months old. followed by later decrease in size. At 36 months of follow-up. the child is alive and disease-free. We describe this case of NB and its abnormally short evolution from stage 1 to stage 4s. despite initial surgery. Its Spontaneous regression May help us understand the natural history of congenital NB
Venous thrombosis and procoagulant factors in high-risk neuroblastoma
No full textAim: The mechanism of increased thrombin production has been investigated in children with high-risk neuroblastoma (NB), to detect any possible association between catheter- related venous thrombosis (VT) and prothrombotic factors. Methods: Consecutive children with high-risk NB were studied by color-doppler ultrasonography of the upper vein system and thrombophilia factors assessment. Plasma levels of Tissue Factor (TF), Vascular Endothelial Growth Factor (VEGF), Prothrombin Activation Fragment 1+2, and Thrombin-Antithrombin Complex were evaluated. Moreover, inherited thrombophilia factors (homocystein, antithrombin, protein C, protein S, factor V Leiden, activated protein C resistence, mutation H1299R and G1691A of factor V, mutation G20210A of prothrombin, mutation T677 and A1298C of methylenetetrahydrofolate reductase, and allele 4G of plasminogen activator inhibitor-1) were tested to exclude congenital disorders. Results: Six patients with mean age: 48.8 months - were studied. Five patients were affected by stage 4 NB and another one by stage 3 NB with Myc-N amplification. All children had a central venous line (mean duration: 8.5 mos). Four patients (67%) had asymptomatic catheter-related VT visualized by color-doppler ultrasonography. No patient had major inherited thrombophilia factors. The levels of plasma TF and plasma VEGF were found elevated in all patients. Mean value of TF (nv 20.3±6.6) was 82 pg/mL with a range of 39 to 131 pg/mL. Mean value of VEGF (nv 24.3 pg/mL) was 78.5 pg/mL with a range of 31 to 142 pg/mL. Conclusion: The increased risk of catheter-related VT detected in our small series of high-risk NB patients, was associated with elevated levels of circulating TF and VEGF. Further studies are needed to evaluate if elevated levels of TF/VEGF are involved both in the hypercoagulable state and in advanced childhood cancer
Venous thrombosis in children with solid tumors
No full textBackground: The prevalence of venous thrombosis (VT) in children with solid tumor and the role of different risk factors are not defined yet. Aim: A cross-sectional observational study was conducted to evaluate the prevalence of both symptomatic and asymptomatic catheter-associated thrombosis events in children affected with different solid tumors. Methods: Patients with a solid tumor, admitted as day-care, were consecutively enrolled over a period of 10 months. All of them had a central venous line. Physical examination, D-dimer serum tests, and eco-color-Doppler ultrasonography were performed once at any time before catheter removal. Results: Forty-two patients (14 females and 28 males)-mean age 115 months-were evaluated. Five of the 42 patients (12%) had VT. In 4 of these, VT was catheter-related: 3 asymptomatic and I symptomatic. In the last patient, VT was clinically symptomatic and not catheter related. Patients with longer duration of catheter insertion presented with a higher rate of VT (P = 0.05). Moreover, patients affected with neuroblastoma showed a higher rate of VT than the others with different solid tumors (P < 0.05). Conclusions: VT was visualized by echo-color-Doppler ultrasonography in 12% of the patients; it was asymptomatic in 7%. In our small series, VT was related to neuroblastoma disease and a longer duration of catheter insertion. Prospective and multicentric studies are required to select risk factors for VT in children with solid tumors
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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