1,721,321 research outputs found
Could a comprehensive urinary endogenous steroidal profile improve the accuracy of prostate-specific antigen screening?
No full textResistance to hormonal therapy in prostate cancer
No full textSeveral therapeutic strategies are actually available in the management of prostate cancer: Targeting the androgen receptor (AR) is the goal both for initial androgen deprivation therapy (ADT) and second-generation androgen ablative agents (abiraterone and enzalutamide). Chemotherapy with taxanes, administered upon progression or as first line approach in association with ADT, is another therapeutic option. Unfortunately, none of these therapies is curative and patients are destined to develop a resistant phenotype. Progression to ADT leads to the attainment of a castration resistant disease whose mechanisms remain incompletely understood. Reactivation of AR has been shown to occur and second-generation of AR targeting drugs are usually prescribed. Upon progression to these agents AR signaling still remains the primary driver although it often becomes ligand independent, since it can be either restored through mutations on the ligand binding domain and/or formation of AR splicing variants or by passed through a cross talk with other oncogenic signaling pathways. AR-independent signaling pathways may represent additional mechanisms underlying castration resistant progression. It is clear that castration resistant prostate cancer is a group of diverse diseases and new treatment paradigms need to be developed
Maintenance everolimus beyond progression in pancreatic NET to control insulinoma syndrome
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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
Neuroendocrine Neoplasia Management: New Approaches for Diagnosis and Treatment
No full textThis book provides the most recent update on the management of neuroendocrine neoplasia (NEN), a term covering all tumors of various organs and/or with a particular histology, including MEN (multiple endocrine neoplasia) related tumors, MiNEN (mixed neuroendocrine-non-neuroendocrine neoplasms), NEC (neuroendocrine carcinoma) and Merkel’s carcinoma. NENs are heterogeneous in their biology, clinical presentation and prognosis, showing a great variability in aggressiveness and therapy response. As a result, their treatment is based on a large spectrum of options. The standard therapies are surgery in early disease, various loco-regional procedures in certain conditions and mostly of a palliative nature in metastatic disease. At present, thanks to our increased understanding of molecular signaling pathways, several pharmacological approaches can be used in patients with advanced NENs. Somatostatin analogs display both anti-tumor effects and symptom control. Novel peptide-radio-receptor treatment (PRRT) is used in patients with well differentiated tumors. The agents targeting angiogenesis and/or PI3K/AKT/mTOR pathway, alone or in combination with analogues, have provided encouraging results in advanced disease. The first part of the book focuses on the history, epidemiology and the most relevant scientific achievements, covering the discoveries in genetic and molecular biology, the endoscopic techniques with guided biopsy, and the metabolic imaging with hybrid PET/CT and MRI/CT. It particularly highlights the emerging strategies in therapy, surgery and mini-invasive surgery as well as loco-regional and systemic treatments, including targeted therapy and/or biological therapies. The second part then explores the management of NENs of various anatomical origins and/or with peculiar biology. It describes the range of the current options and the most relevant results from the clinical trials. This informative book provides valuable insights for all those interested in the management of neuroendocrine neoplasia
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