Vitamin D supplementation and breast cancer prevention : a systematic review and meta-analysis of randomized clinical trials

In recent years, the scientific evidence linking vitamin D status or supplementation to breast cancer has grown notably. To investigate the role of vitamin D supplementation on breast cancer incidence, we conducted a systematic review and meta-analysis of randomized controlled trials comparing vitamin D with placebo or no treatment. We used OVID to search MEDLINE (R), EMBASE and CENTRAL until April 2012. We screened the reference lists of included studies and used the “Related Article” feature in PubMed to identify additional articles. No language restrictions were applied. Two reviewers independently extracted data on methodological quality, participants, intervention, comparison and outcomes. Risk Ratios and 95% Confident Intervals for breast cancer were pooled using a random-effects model. Heterogeneity was assessed using the I2 test. In sensitivity analysis, we assessed the impact of vitamin D dosage and mode of administration on treatment effects. Only two randomized controlled trials fulfilled the pre-set inclusion criteria. The pooled analysis included 5372 postmenopausal women. Overall, Risk Ratios and 95% Confident Intervals were 1.11 and 0.74–1.68. We found no evidence of heterogeneity. Neither vitamin D dosage nor mode of administration significantly affected breast cancer risk. However, treatment efficacy was somewhat greater when vitamin D was administered at the highest dosage and in combination with calcium (Risk Ratio 0.58, 95% Confident Interval 0.23–1.47 and Risk Ratio 0.93, 95% Confident Interval 0.54–1.60, respectively). In conclusions, vitamin D use seems not to be associated with a reduced risk of breast cancer development in postmenopausal women. However, the available evidence is still limited and inadequate to draw firm conclusions. Study protocol code: FARM8L2B5L

Brain Derived Neurotrophic Factor (BDNF) Expression Is Regulated by MicroRNAs miR-26a and miR-26b Allele-Specific Binding

Brain-derived neurotrophic factor (BDNF) is a neurotrophin that plays an essential role in neuronal development and plasticity. MicroRNA (miRNAs) are small non-coding RNAs of about 22-nucleotides in length regulating gene expression at post-transcriptional level. In this study we explore the role of miRNAs as post-transcriptional inhibitors of BDNF and the effect of 3′UTR sequence variations on miRNAs binding capacity. Using an in silico approach we identified a group of miRNAs putatively regulating BDNF expression and binding to BDNF 3′UTR polymorphic sequences. Luciferase assays demonstrated that these miRNAs (miR-26a1/2 and miR-26b) downregulates BDNF expression and that the presence of the variant alleles of two single nucleotide polymorphisms (rs11030100 and rs11030099) mapping in BDNF 3′UTR specifically abrogates miRNAs targeting. Furthermore we found a high linkage disequilibrium rate between rs11030100, rs11030099 and the non-synonymous coding variant rs6265 (Val66Met), which modulates BDNF mRNA localization and protein intracellular trafficking. Such observation led to hypothesize that miR-26s mediated regulation could extend to rs6265 leading to an allelic imbalance with potentially functional effects, such as peptide's localization and activity-dependent secretion. Since rs6265 has been previously implicated in various neuropsychiatric disorders, we evaluated the distribution of rs11030100, rs11030099 and rs6265 both in a control and schizophrenic group, but no significant difference in allele frequencies emerged. In conclusion, in the present study we identified two novel miRNAs regulating BDNF expression and the first BDNF 3′UTR functional variants altering miRNAs-BDNF binding

Lymph node fine needle cytology in the diagnosis of infectious diseases and instrumental guides: ultrasound and computed tomography

Imaging techniques, such as ultrasound imaging (US), computed tomography (CT), positron emission tomography-CT (PET-CT) or PET-magnetic resonance imaging (MRI), are highly accurate procedure in the lymph node enlargement detection, but none of them has the same sensitivity in the biological definition and in the cause of enlargement identification. Therefore, a direct evaluation of corresponding lymph nodes is necessary in much of the cases and Fine Needle Cytology (FNC) is one of the most frequently used technique for this purpose. The same imaging procedures are often used to perform targeted biopsies including FNC. This study discusses procedures, indications, advantages and limitations of imaging techniques as a support to FNC

Perfil de utilização de medicamentos em idosos da zona urbana de Santa Rosa, Rio Grande do Sul, Brasil Use of medicines by the elderly in Santa Rosa, Rio Grande do Sul State, Brazil

Os medicamentos representam um dos itens mais importantes da atenção à saúde do idoso. Estes particularmente utilizam múltiplos medicamentos apresentando mais reações adversas. O estudo objetivou avaliar o perfil do consumo de medicamentos por idosos. Desenvolveu-se um estudo epidemiológico transversal mediante entrevistas domiciliares, numa amostra aleatória de 294 idosos, residentes em Santa Rosa, Rio Grande do Sul, Brasil. Os idosos representam 9% da população. Os resultados evidenciaram consumo médio de 2,79 medicamentos por idoso. O coeficiente de prevalência do uso de medicamentos na última semana foi de 82%, dos 827 medicamentos utilizados pelos idosos 794 (96%), foram prescritos. As classes farmacológicas mais utilizadas foram os anti-hipertensivos (21,3%) e diuréticos (11,3%). A prevalência do uso de medicamentos foi comparável ao encontrado em outros estudos, confirmando a importância dos medicamentos na atenção à saúde do idoso. A porcentagem de medicamentos utilizados sem prescrição médica foi baixa. Os medicamentos e forma de apresentação mais freqüentemente relatados foram os usualmente prescritos e dispensados gratuitamente na rede básica de saúde do município que está estruturada há mais de 10 anos com quase 100% de cobertura.<br>Medicines are one of the most important health care items for the elderly, who are particularly prone to use multiple drugs with a higher number of adverse reactions. The current study aimed to assess the profile of pharmaceutical consumption by the elderly. A cross-sectional epidemiological study used household interviews in a random sample of 294 elderly living in Santa Rosa, Rio Grande do Sul State, Brazil. The elderly represent 9% of the local population. The results showed a mean consumption of 2.79 medicines per individual. The prevalence rate for use of medicines in the previous week was 82%, and of the 827 medicines used by the elderly, 794 (96%) had been prescribed. The most widely used pharmacological classes were anti-hypertensives (21.3%) and diuretics (11.3%). Prevalence of pharmaceutical use was comparable to the results from other studies, thus confirming the importance of medicines in the health of the elderly. The percentage of medicines used without a medical prescription was low. The most frequently reported medicines and formulations were those usually prescribed and dispensed free of cost in the municipal basic health care system, which has been organized for more than 10 years, with coverage of nearly 100%

Automedicação em idosos residentes em Campinas, São Paulo, Brasil: prevalência e fatores associados Self-medication in the elderly population of Campinas, São Paulo State, Brazil: prevalence and associated factors

O objetivo foi avaliar a prevalência e fatores associados à automedicação em idosos e identificar os principais fármacos consumidos sem prescrição. Estudo transversal de base populacional, com amostra estratificada por conglomerados e em dois estágios realizado em Campinas, São Paulo, Brasil, em 2008-2009. Dos 1.515 idosos, 80,4% referiram uso de ao menos um medicamento nos três dias anteriores à pesquisa. Desses, 91,1% relataram consumo exclusivo de medicamentos prescritos e o restante (8,9%), uso simultâneo de prescritos e não prescritos. Após ajuste, idade > 80 anos, hipertensão arterial, presença de doenças crônicas, uso de serviços de saúde, realização de consultas odontológicas e filiação a plano médico de saúde estiveram associadas negativamente, e renda per capita, positivamente à automedicação. Os fármacos sem prescrição mais consumidos foram dipirona, AAS, diclofenaco, Ginkgo biloba, paracetamol e homeopáticos. Sobretudo entre idosos, a assistência farmacêutica deve ser priorizada para evitar o uso incorreto de medicamentos e garantir o acesso aos fármacos necessários ao tratamento.<br>The aim of this study was to evaluate the prevalence and causative factors associated with self-medication in the elderly and identify the main drugs consumed without prescription. A cross-sectional population-based study with stratified clustered two-stage sampling was performed in Campinas, São Paulo, Brazil in 2008 and 2009. Of the 1,515 elderly studied, 80.4% reported using at least one drug duringthe three days preceding the survey. Of these, 91.1% reported the use of prescription drugs only and the remainder (8.9%) reported simultaneous use of prescribed and non prescribed drugs. After adjustment, a negative association between age > 80 years, hypertension, chronic diseases, use of health services, dental consultations and adherence to a medical plan,and self-medication was found, whereas a positive association was found with per capita income. Dipyrone, acetylsalicylic acid, diclofenac, Ginkgo biloba, paracetamol and homeopathic medicines were among the most used non-prescribed drugs. Pharmaceutical assistance should be provided as a priority tothe elderly, to avoid the misuse of medicines and ensure access to the correct drugs