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artículo
Publicado 2017
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A pesar del uso globalizado y masivo de la Esofagogastroduodenoscopia estándar (EGD), el cáncer gástrico (CG) sigue siendo uno de los cánceres más comunes y continúa posicionado como el tumor maligno más frecuente en el Este de Asia, Este de Europa y partes de América Latina. Las limitaciones actuales de usar un examen no sistemático durante la EGD pueden parcialmente ser responsables de la baja incidencia del diagnóstico de CG temprano en países con una alta prevalencia de la enfermedad. Originalmente propuesta por Emura et al., la Endoscopia Sistemática Alfanumérica Codificada (SACE) es un nuevo método que facilita el examen completo y sistemático del tracto gastrointestinal alto basado en la foto-documentación secuencial con imágenes parcialmente superpuestas y que, usando una nomenclatura alfanumérica endoluminal compuesta de ocho regiones y 28 áreas proporciona el...
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artículo
BACKGROUND Osimertinib is a third-generation epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI) that is selective for EGFR-TKI-sensitizing and EGFR T790M resistance mutations. Evidence suggests that the addition of chemotherapy may extend the benefits of EGFR-TKI therapy. METHODS In this phase 3, international, open-label trial, we randomly assigned in a 1:1 ratio patients with EGFR-mutated (exon 19 deletion or L858R mutation) advanced non- small-cell lung cancer (NSCLC) who had not previously received treatment for advanced disease to receive osimertinib (80 mg once daily) with chemotherapy (pemetrexed [500 mg per square meter of body-surface area] plus either cisplatin [75 mg per square meter] or carboplatin [pharmacologically guided dose]) or to receive osimertinib monotherapy (80 mg once daily). The primary end point was investigator- assessed progression-free surv...
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artículo
Publicado 2016
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We present results from a multi-chord Pluto stellar occultation observed on 2015 June 29 from New Zealand and Australia. This occurred only two weeks before the NASA New Horizons flyby of the Pluto system and serves as a useful comparison between ground-based and space results. We find that Pluto's atmosphere is still expanding, with a significant pressure increase of 5 +/- 2% since 2013 and a factor of almost three since 1988. This trend rules out, as of today, an atmospheric collapse associated with Pluto's recession from the Sun. A central flash, a rare occurrence, was observed from several sites in New Zealand. The flash shape and amplitude are compatible with a spherical and transparent atmospheric layer of roughly 3 km in thickness whose base lies at about 4 km above Pluto's surface, and where an average thermal gradient of about 5 K km(-1) prevails. We discuss the possibility that...
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informe técnico
Publicado 2016
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Within the tropics, the species richness of tree communities is strongly and positively associated with precipitation. Previous research has suggested that this macroecological pattern is driven by the negative effect of water‐stress on the physiological processes of most tree species. This implies that the range limits of taxa are defined by their ability to occur under dry conditions, and thus in terms of species distributions predicts a nested pattern of taxa distribution from wet to dry areas. However, this ‘dry‐tolerance’ hypothesis has yet to be adequately tested at large spatial and taxonomic scales. Here, using a dataset of 531 inventory plots of closed canopy forest distributed across the western Neotropics we investigated how precipitation, evaluated both as mean annual precipitation and as the maximum climatological water deficit, influences the distribution of tropica...
