1,720,958 research outputs found
Prostate biopsy after abdominoperineal resection: a diagnostic challenge
No full textProstate biopsy in patients who underwent abdominoperineal resection (APR) of the rectum is commonly considered a technical challenge even for experienced urologists, although tissue diagnosis is essential in prostate cancer management. Transperitoneal, transperineal and transgluteal approaches have been reported, under US, CT or MRI guidance. Transperineal biopsy seems to be the safest and most cost-effective technique. At our institution we developed a modified transperineal biopsy approach with combined transperineal and suprapubic US guidance. Here we report the cases of two patients who came to our institution for PSA raise years after APR procedure, describing in detail the modified transperineal technique and the results of tissue sampling
Cancro della prostata e prostatite cronica: impredittività del PSA totale e del rapporto PSA libero/PSA totale
No full textNMP 22, UBC, BTA, citologia urinaria e cistoscopia nella diagnosi e nel follow-up dei carcinomi a cellule transizionali (CCT).
No full textRole of transperineal six-core prostate biopsy in patients with prostate-specific antigen level greater than 10 ng/ml and abnormal digital rectal examination findings
No full textOBJECTIVES: To define whether six-core biopsies still have a role in patients presenting with prostate-specific antigen (PSA) levels greater than 10 ng/mL and abnormal digital rectal examination (DRE) findings. Recent studies have suggested that the six-core biopsy is inadequate for the diagnosis of prostate cancer; however, it remains controversial whether an increased number of cores is justified in all patients. METHODS: From June 2002 to February 2005, 122 (18.8%) of 650 patients underwent prostate biopsy because of a PSA level greater than 10 ng/mL and abnormal DRE findings. All patients underwent transperineal ultrasound-guided prostate biopsy in a standardized fashion: a six-core biopsy was performed first, followed by six additional cores during the same session, four in the peripheral and two in the transition zone. RESULTS: The detection rate in patients with a PSA level greater than 10 ng/mL and abnormal DRE findings was 72.1% (88 of 122) and 75.4% (92 of 122) using the 6-core and 12-core biopsy, respectively. One case of tumor was missed by the six-core biopsy among patients with a PSA level greater than 15 ng/mL and abnormal DRE findings. No cases of tumor were missed by six-core biopsy in the group with a PSA level greater than 20 ng/mL and abnormal DRE findings. CONCLUSIONS: Six-core biopsy provided a similar cancer detection rate compared with 12-core biopsy in patients with PSA levels greater than 10 ng/mL and abnormal DRE findings. An initial approach with 6-core biopsy is reasonable in patients with a PSA level greater than 10 ng/mL and abnormal DRE findings and is advocated in those with PSA greater than 20 ng/mL and abnormal DRE findings
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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