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Clinical Significance Of Isolated Diminutive Colonic Polyps
No full textINTRODUCTION/OBJECTIVES: Several reports have assessed clinical significance of diminutive (1-5
mm) polyps; here we report on the prevalence of advanced histology in patient with "isolated" diminutive
polyps, i.e. without associated polyps of larger size.
AIMS & METHODS: Retrospective examination of endoscopy records and of histopathology records of
patients with polyps of any size. Advanced histology was defined as the presence of high grade dysplasia
(HGD) or in situ carcinoma. Polyps were categorized into three groups: diminutive (1-5 mm); small (6-10
mm) and large (11 mm or more).
Diminutive Small Large Advanced Carcinoma
Number 315 89 67 84
Male (%) 205 (62) 57 (64) 46 (68) 52 (62)
Mean age 62.0 67.2 68.7 70.1
% HGD 0.9 11.2 32.8 Not appropriated
RESULTS: Data on 2176 consecutive colonoscopies were evaluated; biopsies were performed in 895
(41%); 555 (61%) biopsies evaluated polyps of various size; 315 patients (61%) showed "isolated"
diminutive polyps, 89 (16%) patients had small polyps and 67 (12%) had large polyps. Advanced
carcinoma was present in 84 (15%) patients. Mean age and prevalence of high grade dysplasia are shown
in the table.
CONCLUSION: "Isolated" diminutive polyps are at very low risk of advanced histology; small polyps carry
a significant risk of advanced histological features. Difference in mean age between groups at different risk
of HGD and with patients with advanced carcinoma suggests that progression from diminutive polyps to
polyps of larger size and with significant HGD risk might need several (5 or 6) years
Risk of villous histology or high grade dysplasia in patients with diminutive polyps: influence of number of polyps
No full textINTRODUCTION/OBJECTIVES: Current recommendations on post-polypectomy surveillance recommend
shorter intervals in case of 3 or more polyps, irrespectively of histological findings (see reference below).
These recommendations doesn't differentiate between diminutive (1-5 mm) polyps and polyps of larger
size (>5 mm).
AIMS & METHODS: Aim of the present study was to assess, in a group of patients with "isolated"
diminutive polyps, i.e. without associated polyps of larger size, if the presence of 3 or more diminutive
polyps is associated with higher number of polyps with villous histology (VH) or high grade dysplasia
(HGD). Retrospective examination of endoscopical records and of histopathological records of patients
with diminutive polyps.
RESULTS: 315 patients with "isolated" diminutive polyps were identified; 171 patients showed neoplastic
(i.e.adenomatous) histology, while remaining showed hyperplastic histology or absence of polypoid
features at histology. Data on prevalence of villous component at histology according to number of polyps
detected are shown in the table.
N° of patients VH HGD TOT N° of polyps
(%)
1 polyp 97 6 1 7 (7.2) 97
2 polyps 43 9 0 9 (20.5) 86
>2 polyps 31 1 0 1 (3.0) 112
Prevalence of villous histology or HGD according to number of diminutive polyps was 16/140 (11.4%) in
patients with one or two diminutive polyps and 1 /112 (0.8%) in patients with 3 or more polyps.
CONCLUSION: Number of diminutive polyps found in a single patient does not seem to affect risk of
villous histology or high grade dysplasia in diminutive polyps. Further studies are needed to assess if
current recommendations on 3-year intervals of surveillance for patients with 3 or more polyps can apply
to patients with "isolated" diminutive polyps
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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