1,720,960 research outputs found
Significato prognostico delle micrometastasi linfonodali nell'adenocarcinoma esofageo
No full textThe aim of the study was to test the hypothesis that a subgroup of patients considered N0 at standard single-section pathological examination may have occult lymph-node metastases (micrometastases) associated with a poor prognosis. Fifty-nine patients with oesophageal adenocarcinoma undergoing resection were studied by standard histological examinations, serial sections and immunohistochemistry, and their long-term prognoses were compared. Eight (26%) out of 31 patients previously staged as pN0 at standard histological examination were staged as pN1 or Pn2 by serial sections and/or immunohistochemistry and had a prognosis which was significantly worse than that of true pN0 patients (5-year survival: 38% vs 76%, respectively; P < 0.05) and similar to that of pN1 patients. More than a quarter of those patients classified as pN0 at standard histological examination may have occult lymph node metastases at serial sections and/or immunohistochemistry and have a prognosis similar to that of pN1 patients
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Significato biologico delle micrometastasi linfonodali e midollari nel carcinoma esofageo
No full textThe aim of the study was to test the hypothesis that a subgroup of patients considered N0 at standard single-section pathological examination may have occult lymph-node metastases (micrometastases) associated with a poor prognosis. Fifty-nine patients with oesophageal adenocarcinoma undergoing resection were studied by standard histological examinations, serial sections and immunohistochemistry, and their long-term prognoses were compared. Eight (26%) out of 31 patients previously staged as pN0 at standard histological examination were staged as pN1 or Pn2 by serial sections and/or immunohistochemistry and had a prognosis which was significantly worse than that of true pN0 patients (5-year survival: 38% vs 76%, respectively; P < 0.05) and similar to that of pN1 patients. More than a quarter of those patients classified as pN0 at standard histological examination may have occult lymph node metastases at serial sections and/or immunohistochemistry and have a prognosis similar to that of pN1 patients
Lymph node micrometastases in patients with adenocarcinoma of the esophagogastric junction
No full textRecurrences of adenocarcinoma of the esophagogastric junction are frequent even in patients who are classified as pN0 after radical resection, suggesting that occult nodal metastases may have been missed on routine histologic examination. Immunohistochemical analysis using antibodies to cytokeratin was retrospectively performed in 1301 lymph nodes from 46 patients who underwent surgical resection for adenocarcinoma of the esophagogastric junction through a laparotomy and a right thoracotomy. Compared to routinely stained sections, the total number of metastatic lymph nodes was significantly (P = 0.0001) increased when both serial sectioning and anticytokeratin immunohistochemical analysis were performed. Overall 6 (33.3%) of the 18 patients previously considered N0 were recategorized as N1 for the presence of micrometastases to lesser curvature nodes. Three of these patients had recurrent disease within the first year of follow-up. Both the probability of survival or no recurrence and the disease-free survival were significantly greater in patients in whom the ratio of invaded to removed lymph nodes was less than 0.2. Anticytokeratin analysis identified occult nodal metastases in one third of our patients with adenocarcinoma of the esophagogastric junction. This modified tumor staging and had an impact on overall and disease-free survival
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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