False-negative Papanicolaou tests in women with biopsy-proven invasive endocervical adenocarcinoma/adenocarcinoma in situ: a retrospective analysis with assessment of interobserver agreement.

INTRODUCTION: The objectives of our study were to identify factors contributing to false-negative Papanicolaou (Pap) tests in patients with endocervical adenocarcinoma (EA) or adenocarcinoma in situ (AIS), and to analyze the impact of educational instruction on interobserver agreement in these cases. MATERIALS AND METHODS: False-negative Pap tests from patients with EA/AIS were reviewed by a consensus group and by 12 individual reviewers in 2 rounds, with an educational session on glandular neoplasia in Pap tests conducted between the 2 rounds. RESULTS: Of 79 Pap tests from patients with EA/AIS, 57 (72.2%) were diagnosed as abnormal and 22 (27.8%) as negative. Of the 22 false-negative cases, 10 remained negative on consensus review, with false-negative diagnoses attributed to sampling variance. The other 12 cases were upgraded to epithelial abnormalities (including 8 to glandular lesions). The false-negative diagnoses were attributed to screening variance in 2 cases and interpretive variance in 10 cases. On individual review, abnormal cells were misinterpreted as reactive glandular cells or endometrial cells in 7 of 8 and 5 of 8 cases upgraded to glandular abnormalities, respectively. With education, the proportion of individual reviewers demonstrating at least moderate agreement with the consensus diagnosis (Cohen's kappa >0.4) increased from 33% (4 of 12) to 75% (9 of 12). CONCLUSIONS: Sampling and interpretive variance each accounted for nearly one-half of the false-negative Pap tests, with underclassification as reactive glandular or endometrial cells the main source of the interpretive variances. Educational instruction significantly decreased the interpretive variance and interobserver variability in the diagnosis of glandular abnormalities.

Intoxicaciones agudas con pesticidas para fines suicidas en Costa Rica durante la década de 2010-2020 / SuicideSuicide attempts due to pesticide poisoning in Costa Rica during the 2010-2020 decade

Resumen Introducción: La intoxicación con plaguicidas es de los métodos más utilizados por los suicidas, especialmente en países agrícolas de ingreso medio-bajo. El objetivo de la investigación fue describir y analizar la situación epidemiológica de la intoxicación aguda por plaguicidas con fines suicidas en Costa Rica durante los años 2010-2020. Materiales y métodos: Se recopilaron datos del Centro Nacional para el Control de Intoxicaciones (CNCI) de las intoxicaciones agudas con plaguicidas para fines suicidas durante el 2010-octubre 2020 y datos del Instituto Nacional de Estadística y Censos (INEC) de las defunciones por suicidios con plaguicidas durante los años 2010-2019. Los datos se analizaron por sexo, edad, provincia, agente tóxico, ruta de absorción, severidad del cuadro clínico y mortalidad. Resultados: De las 3240 intoxicaciones agudas totales con plaguicidas para fines suicidas durante los años 2010-octubre 2020, el 64.7% eran hombres y 35.3% mujeres; 31.9% de las intoxicaciones ocurrieron en personas en edades entre los 20-29 años y 21% entre 30-39 años; 23.4% de los incidentes ocurrieron en la provincia de Alajuela y 19.7% en San José; el 75% de los plaguicidas utilizados eran de uso agrícola; en el 17.2% de las intoxicaciones utilizaron Glifosato y 15.9% Paraquat; en 98.3% de los casos la ruta de absorción fue por ingestión; 65.3% de los casos fueron reportados con sintomatología leve según el CNCI. Durante el 2010-2019, 432 personas murieron por suicidio utilizando plaguicidas, lo que significa una mortalidad anual promedio de 13.3% de las intoxicaciones agudas con plaguicidas para fines suicidas Conclusiones: La epidemiología de los intentos suicidas utilizando pesticidas en CR es muy similar a los patrones internacionales predominando hombres jóvenes en zonas agrícolas y que tienen acceso a los pesticidas. Es necesario fortalecer medidas e implementar políticas para la regulación, almacenaje y manejo adecuado de los plaguicidas.

Abstract Introduction: Pesticides self-poisoning is one of the most popular suicide methods especially in lower middle class income agricultural countries. The objective of this research is to describe and analyze the epidemiological situation of suicide attempts due to pesticide poisoning in Costa Rica during the last decade. Materials and methods: Data of pesticides self-poisoning goes all the way from 2010 until October 2020. That information was collected from the National Center for Poisoning Control (CNCI, stands for the initials in spanish) database and National Institute for Statistics and Census (INEC in spanish) data of pesticides self-poisoning deaths from 2010-2019. All data was analyzed by sex, age, province, toxic agent, route of absorption, clinical severity and mortality. Results: There were 3240 total cases of suicide attempts due to pesticides during 2010-october 2020; 64.7% of this poisoning were in men and 35.3% in women, 31.9% of the poisoning persons were in age with a range between 20-29 years and 21% between 30-39 years old; 23.4% of cases were reported in Alajuela and 19.7% in San José; 75% of the cases used agricultural pesticide; 17.2% of the poisonings occurred due to Glifosato and 15.9% due to Paraquat; ingestion was the route of absorption in 98.3% of the cases; and 65.3% reported mild clinical severity. During 2010-2019, 432 people died due to suicide using pesticides as a weapon, which means an average mortality of 13.3% of all the suicide attempts with pesticides in this period. Conclusions: Costa Rica´s epidemiology of suicide attempts using pesticides is very similar to international epidemiology, where most of the cases are young men that have access to pesticides and lived-in agricultural areas. It´s necessary to implement policies for the regulations, storage and proper management of pesticides in order to prevent suicide.

A Cell-Based Assay Optimized for High-Content Cilia Imaging with Primary Rat Hippocampal Neurons.

Genetic manipulations of dissociated rodent neurons provide translatable in vitro models for disease-driven phenotypes. Cilia are cellular antenna with a role in neuronal maturation and function often perturbed in neurodevelopmental disorders. Efforts for automated imaging of these microscopic protrusions are crucial given the role of cilia in the brain. We developed a cell-based assay to monitor cilia in rat hippocampal neurons using lentiviral-mediated shRNA-based gene silencing. This optimized platform can be used for high-throughput cilia imaging, disease modeling, and drug screening. For complete details on the use and execution of this protocol, please refer to Di Nardo et al. (2020).

Frontal fibrosing alopecia: A new autoimmune entity?

Frontal fibrosing alopecia (FFA) is a rare type of cicatricial alopecic band, with bilateral and symmetric progressive regression of the frontotemporal hairline. The specific mechanisms of development of FFA remain unknown. Due to several clues, including the presence of lymphocytic infiltrates and the association of FFA with other autoimmune disorders, we hypothesised that FFA may be a new autoimmune condition, and future research must be focused on this possible origin.