1,720,965 research outputs found
Assessment of nodal status for perihilar cholangiocarcinoma location, number, or ratio of involved nodes.
No full textSurgical treatment of perihilar cholangiocarcinoma (PCC) is the treatment of choice that can achieve long term results. Unfortunately the presence of lymph node metastases is frequent and it is one of the major negative prognostic factors in patients submitted to surgery. In literature there are few data about the prognostic significance of location, number and ratio of involved nodes. Moreover guidelines about the extent of lymph node dissection are not available. In this commentary the data of literature about prognostic significance of lymph node involvement are described and analysed
Total Dorsal Pancreatectomy, an Alternative to Total Pancreatectomy: Report of a New Case and Literature Review
No full textBackground: Total dorsal pancreatectomy (TDP) is a conservative pancreatic resection that should be considered in cases of benign or low malignant tumors confined to the dorsal pancreas to preserve the viability of both digestive and biliary tracts, and to avoid the endocrine and metabolic consequences of total pancreatectomy. We report a new case of TDP and provide a literature review of this procedure. Methods: The case reported was a 35-year-old female patient with a solid pseudopapillary tumor. We resected the dorsal segment of the pancreas while preserving the common bile duct, gastroduodenal artery, and pancreaticoduodenal arcades, and the spleen and splenic vessels. The MEDLINE® and Embase® databases were searched for English language studies, case series, or case reports published through August 31, 2017. Results: The postoperative course was uneventful and patient was discharged on postoperative day 11. The patient was alive and in good condition at the 10-year follow-up. To date in English literature, there are only 3 reported cases of TDP, and all cases were patients with intraductal papillary mucinous neoplasia and pancreas divisum. There was no postoperative mortality, and 2 grade B pancreatic fistulas healed 1 month postoperatively. Conclusions: TDP is a feasible and safe operation for benign or low grade malignant pancreatic tumors involving the dorsal pancreas, as an alternative to total pancreatectomy
Patterns and prognostic significance of lymph node dissection for surgical treatment of perihilar and intrahepatic cholangiocarcinoma.
No full textThe prognostic significance of lymph node dissection (LND), the number and status of harvested lymph nodes (LNs), and the lymph node ratio (LNR) are still under debate in intrahepatic (ICC) and perihilar (PCC) cholangiocarcinoma. The aims of this study were to evaluate the prognostic value of the extent of LN dissection, the number of positive LNs, the distribution of positive LNs along different LN stations, and the LNR in a cohort of patients with ICC and PCC who underwent surgical resection and to compare the different prognostic values of lymph node involvement.A retrospective analysis was done evaluating extent of LND, number, status, and location of harvested LNs in a cohort of 145 patients with cholangiocarcinoma submitted to surgical resection with curative intent from 1990 to 2012.Seventy patients had ICC and 75 had PCC. The median survival times of patients with N0 and N+ tumors were 42 and 19 months in ICC patients (p = 0.05) and 42 and 22 months in PCC patients (p = 0.01). In patients without LN metastases, the median survival times of patients with up to three LNs retrieved and with more than three LNs retrieved were 38 and 69 months in ICC patients (p = 0.05) and 18 and 43 months in PCC patients (p = 0.04), respectively. In N+ patients, the location of positive LNs (hepatoduodenal ligament or other regional stations) did not influence overall survival in ICC or PCC patients (p = 0.6). The median survival times of patients with LNRs of 0 and >0.25 were 43 and 19 months in ICC patients (p = 0.01); the 0-0.25 group did not reach the value. In PCC patients, median survival of 0, 0-0.25, and >0.25 groups of patients were 42, 23, and 11 months (p = 0.01), respectively.LN metastasis is a major prognostic factor after surgical resection of cholangiocarcinoma. The number of harvested LNs and the LNR showed a high prognostic value in ICC and PCC
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
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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