RESUMO Introdução: Diferentes técnicas cirúrgicas foram desenvolvidas para a redução do volume glandular e para a correção da ptose mamária com o objetivo de obter resultados eficientes e de qualidade com o menor número de complicações possível. Este artigo descreve a técnica de mastopexia idealizada pelo Dr. Roberto Antonio Barjaz Millan e a avaliação do nível de satisfação das mulheres após o procedimento. Métodos: Trata-se de um estudo transversal, observacional e analítico desenvolvido a partir da análise da técnica de mastopexia na redução mamária e na correção de ptose mamária padronizada pelo Dr. Millan, realizado no Setor de Cirurgia Plástica do Centro Universitário Saúde ABC. Participaram do estudo 20 mulheres com ptose mamária grau II e III, segundo classificação de Regnault, ou hipertrofia mamária, definida pelos critérios de Sacchini et al. e de Franco & Rebello, ainda não submetidas a cirurgia e 20 mulheres previamente submetidas a mastopexia pela técnica de Millan, com idades entre 18 e 60 anos. Para análise do nível de satisfação após o procedimento, foi aplicado o questionário BREAST-Q®. Resultados: Não houve diferenças significantes das mulheres que fizeram a cirurgia (grupo pós-cirúrgico) quando comparadas às que não fizeram cirurgia (grupo controle) em relação às variáveis idade (p=0,357), Índice de Massa Corporal (p=0,695), grau de hipertrofia (p=0,799) e grau de ptose mamária (p=0,391). Em relação às variáveis de satisfação com mamas, psicossocial, sexual, físico, todas as pacientes submetidas a cirurgia apresentaram valores maiores comparados aos valores obtidos nas pacientes do grupo sem cirurgia (p<0,009). Conclusão: A técnica de mastopexia idealizada pelo Dr. Millan apresenta resultados que foram considerados satisfatórios pelas pacientes avaliadas.

ABSTRACT Introduction: Different surgical techniques were developed to reduce glandular volume and correct breast ptosis, with the objective of efficient and quality results for the patients and with the fewest possible complications. This study describes the treatment technique standardized by Dr. Roberto Millan and the level of women’s satisfaction after performing the procedure. Methods: This is a cross-sectional, observational and analytical study carried out from the analysis of the breast treatment technique standardized by Dr. Millan performed at the Plastic Surgery Sector of Centro Universitário Saúde ABC. The study included 20 women with grade II and III breast ptosis, according to Regnault’s classification, or breast hypertrophy, defined by the criteria of Sacchini et al. and by Franco & Rebello; and 20 women previously submitted to mastopexy or reduction mammoplasty using the Millan technique, aged between 18 and 60 years. The BREAST-Q® questionnaire was applied to analyze the level of satisfaction after the procedure. Results: It is observed that there were no significant differences between women who underwent the surgery Mass group (post-surgical group) when compared to those who did not undergo surgery (control group) concerning age (p=357), (p=0.695), degree of hypertrophy (p=0.799) and degree of breast ptosis (p=0.391). Regarding breast satisfaction, psychosocial, sexual, and physical variables all presented higher values in women with surgery than those without surgery (p<0.009). Conclusion: The breast treatment technique standardized by Dr. Millan presents results that led to patient satisfaction.

ABSTRACT Objective: To assess the trend in motorcyclist mortality rate from traffic accidents in the state of São Paulo, Brazil, from 2015 to 2020. Methods: This is an ecological time series study with secondary data from the Traffic Accident Management Information System of the State of São Paulo (INFOSIGA), referring to motorcyclists’ deaths due to road traffic injuries in the state of São Paulo, Brazil, from 2015 to 2020. The Annual Percent Change was calculated according to the Prais-Winsten regression model, using the Stata 14.0 software. Results: A total of 11,343 deaths of motorcyclists due to road traffic injuries were reported. The highest proportion of deaths occurred among men (88.1%), aged between 18 and 24 years (27.9%), in the two most populous and urbanized regions of the state. The distribution of mortality showed minimal variation in the analyzed period, from 4.22 to 4.42 deaths/100 thousand inhabitants. Among the analyzed sociodemographic variables, the mortality trend of motorcyclists was mostly stationary. Conclusion: The analysis of the mortality of motorcyclists due to road traffic injuries in the state of São Paulo showed a stationary trend.

RESUMO Objetivo: Avaliar a tendência da taxa de mortalidade de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo, Brasil, nos anos de 2015 a 2020. Métodos: Estudo ecológico de delineamento de série temporal com dados secundários provenientes do Sistema de Informações Gerenciais de Acidentes de Trânsito do Estado de São Paulo (INFOSIGA), referentes aos óbitos de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo, de 2015 a 2020. A variação percentual anual foi calculada pelo modelo de regressão de Prais-Winsten, utilizando o programa STATA 14.0. Resultados: Foram notificados 11.343 óbitos de motociclistas resultantes de lesões por acidentes de trânsito. A maior proporção de óbitos ocorreu entre indivíduos do sexo masculino (88,1%), entre 18 e 24 anos de idade (27,9%), nas duas regiões mais populosas e urbanizadas do estado. A distribuição da taxa de mortalidade apresentou mínima variação no período analisado, de 4,22 a 4,42 óbitos/100 mil habitantes. Entre as variáveis sociodemográficas analisadas, a tendência da mortalidade de motociclistas foi estacionária em sua maioria. Conclusão: A análise da taxa de mortalidade de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo apresentou tendência estacionária.

RESUMO Objetivo: Avaliar a tendência da taxa de mortalidade de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo, Brasil, nos anos de 2015 a 2020. Métodos: Estudo ecológico de delineamento de série temporal com dados secundários provenientes do Sistema de Informações Gerenciais de Acidentes de Trânsito do Estado de São Paulo (INFOSIGA), referentes aos óbitos de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo, de 2015 a 2020. A variação percentual anual foi calculada pelo modelo de regressão de Prais-Winsten, utilizando o programa STATA 14.0. Resultados: Foram notificados 11.343 óbitos de motociclistas resultantes de lesões por acidentes de trânsito. A maior proporção de óbitos ocorreu entre indivíduos do sexo masculino (88,1%), entre 18 e 24 anos de idade (27,9%), nas duas regiões mais populosas e urbanizadas do estado. A distribuição da taxa de mortalidade apresentou mínima variação no período analisado, de 4,22 a 4,42 óbitos/100 mil habitantes. Entre as variáveis sociodemográficas analisadas, a tendência da mortalidade de motociclistas foi estacionária em sua maioria. Conclusão: A análise da taxa de mortalidade de motociclistas decorrentes de lesões por acidentes de trânsito no estado de São Paulo apresentou tendência estacionária.

ABSTRACT Objective: To assess the trend in motorcyclist mortality rate from traffic accidents in the state of São Paulo, Brazil, from 2015 to 2020. Methods: This is an ecological time series study with secondary data from the Traffic Accident Management Information System of the State of São Paulo (INFOSIGA), referring to motorcyclists’ deaths due to road traffic injuries in the state of São Paulo, Brazil, from 2015 to 2020. The Annual Percent Change was calculated according to the Prais-Winsten regression model, using the Stata 14.0 software. Results: A total of 11,343 deaths of motorcyclists due to road traffic injuries were reported. The highest proportion of deaths occurred among men (88.1%), aged between 18 and 24 years (27.9%), in the two most populous and urbanized regions of the state. The distribution of mortality showed minimal variation in the analyzed period, from 4.22 to 4.42 deaths/100 thousand inhabitants. Among the analyzed sociodemographic variables, the mortality trend of motorcyclists was mostly stationary. Conclusion: The analysis of the mortality of motorcyclists due to road traffic injuries in the state of São Paulo showed a stationary trend.

SUMMARY OBJECTIVE The aim of this study was to assess cardiac autonomic modulation in postmenopausal women with and without dry eye syndrome (DES) and to identify associations between clinical and socioeconomic factors. METHODS A cross-sectional study was carried out at the Institute of Ocular Surgery of the Northeast (ICONE), Brazil. Convenience sample of postmenopausal women, over 40 years old, who were divided into two groups: with and without DES. Clinical, sociodemographic, and ophthalmological characteristics of these women were assessed. Capture of RR intervals was performed using a cardio frequency meter. Differences between the groups were analyzed using the Chi-square test, the Student’s t test, and the Mann-Whitney test. RESULTS Women with DES were present in 60.4% (n=58), highest median age (63.5 years, 95%CI 62.0–67.9; p<0.001), median length of time menopause (19 years old, 95%CI 10.4–24.0; p<0.001). There was a difference in the standard deviation of all normal-to-normal index between the groups. However, when the differences were adjusted to the clinical model, no association was found between DES and heart rate variability (HRV). CONCLUSIONS The analysis of cardiac autonomic modulation in postmenopausal women is similar in the presence or absence of DES. Clinical factors, time of menopause, and intensity of symptoms were not associated with HRV indices.

Melatonin, a hormone released by the pineal gland, demonstrates several effects on the cardiovascular system. Herein, we performed a systematic review and meta-analysis to verify the effects of melatonin in an experimental model of myocardial infarction. We performed a systematic review according to PRISMA recommendations and reviewed MEDLINE, Embase, and Cochrane databases. Only articles in English were considered. A systematic review of the literature published between November 2008 and June 2019 was performed. The meta-analysis was conducted using the RevMan 5.3 program provided by the Cochrane Collaboration. In total, 858 articles were identified, of which 13 were included in this review. The main results of this study revealed that melatonin benefits the cardiovascular system by reducing infarct size, improving cardiac function according to echocardiographic and hemodynamic analyses, affords antioxidant effects, improves the rate of apoptosis, decreases lactate dehydrogenase activity, enhances biometric analyses, and improves protein levels, as analyzed by western blotting and quantitative PCR. In the meta-analysis, we observed a statistically significant decrease in infarct size (mean difference [MD], -20.37 [-23.56, -17.18]), no statistical difference in systolic pressure (MD, -1.75 [-5.47, 1.97]), a statistically significant decrease in lactate dehydrogenase in animals in the melatonin group (MD, -4.61 [-6.83, -2.40]), and a statistically significant improvement in the cardiac ejection fraction (MD, -8.12 [-9.56, -6.69]). On analyzing potential bias, we observed that most studies presented a low risk of bias; two parameters were not included in the analysis, and one parameter had a high risk of bias. Melatonin exerts several effects on the cardiovascular system and could be a useful therapeutic target to combat various cardiovascular diseases.

RESUMO OBJETIVO Analisar o nível de conhecimento e aceitabilidade da vacina contra o HPV entre adolescentes vacinados e não vacinados na Amazônia Ocidental. MÉTODOS Estudo transversal com adolescentes de 10 a 19 anos. O instrumento usado para coletar dados contém informações demográficas e socioeconômicas e 27 perguntas que avaliam o conhecimento e a aceitabilidade da vacina contra o HPV. Para comparar a prevalência de adolescentes vacinados com as respostas corretas para perguntas sobre conhecimento, aceitabilidade e vacinação contra o HPV, o modelo de regressão de Poisson de variância robusta foi utilizado no software Stata 13.0. Resultados: Participaram do estudo 190 adolescentes, 60,5% (n=115) na faixa etária de vacinação recomendada pelo governo brasileiro; dentre eles, 53,9% (n=62) relataram não ter sido vacinados (p<0,001). A proporção de resultados corretos entre os adolescentes foi de 78,9% (n=150), que reconheceram o HPV como vírus; 63,7% (n=121) relataram o HPV como causa de câncer do colo do útero. Os participantes que sabem que o HPV é um fator causal no câncer do colo do útero têm 1,94 (IC 1,18-3,18; p=0,009) vez mais chances de terem sido vacinados do que aqueles que não sabem. Entre os entrevistados, as principais fontes de conhecimento sobre a vacina foram escolas (51,6%) e profissionais de saúde (22,6%). CONCLUSÃO Adolescentes não vacinados apresentam lacunas de conhecimento sobre o HPV e sua vacina quando comparados aos vacinados. Nossos resultados enfatizam a necessidade de campanhas eficazes para fornecer informações adequadas sobre o HPV e sua vacina a adolescentes, pais e profissionais de saúde.

SUMMARY PURPOSE To analyze the level of knowledge about and the acceptability of the HPV vaccine among vaccinated and unvaccinated adolescents in the Western Amazon. METHODS A cross-sectional study on adolescents aged 10 to 19 years. The instrument used to collect data contains demographic and socioeconomic information and 27 questions that assess the knowledge and acceptability of the HPV vaccine. To compare the prevalence of vaccinated adolescents with the correct answers to questions about HPV and acceptability and vaccination, the robust variance Poisson regression model was used in the Stata 13.0 software. FINDINGS A total of 190 adolescents participated in the study, 60.5% in the age group of vaccination recommended by the Brazilian government, among them, 53.9% reported not having been vaccinated (p <0.001). A total of 150 (78.9%) adolescents correctly recognized HPV as a virus; 121 (63.7%) recognized HPV as a cause of cervical cancer. Participants who know HPV is a causative factor for cervical cancer are 1.94 times more likely to have been vaccinated than those who do not. Among the interviewees, the main sources of knowledge about the vaccine were schools (51.6%) and health professionals (22.6%). CONCLUSION Unvaccinated adolescents have knowledge gaps about HPV and its vaccine when compared to those vaccinated. Our results emphasize the need for effective campaigns to deliver adequate information about HPV and its vaccine to adolescents, their parents, and health professionals.

RESUMO INTRODUÇÃO A associação entre diagnósticos ginecológicos e sua distribuição nos setores de saúde proporciona benefícios no campo da promoção de saúde e na identificação de temas para educação continuada na assistência. OBJETIVO Identificar os diagnósticos em saúde e o fluxo de encaminhamento de mulheres no climatério. MÉTODO Trata-se de estudo transversal realizado no Ambulatório de Saúde da Mulher do Hospital Universitário da Universidade de São Paulo, de referência em ginecologia e de treinamento para residentes de Medicina de Família e Comunidade, entre 2017-2018. A casuística foi realizada a partir de 274 prontuários de mulheres atendidas e foram processados informações sociodemográficas e clínicas, diagnósticos ginecológicos e distribuição dos serviços de saúde (primário, secundário e terciário). O teste qui-quadrado e razão de chance foram utilizados para estatística. RESULTADOS O tabagismo (OR=2,27, IC95% 1,05;4,89, p=0,035) foi associado ao encaminhamento de mulheres no climatério para a maior complexidade. Em relação aos tipos de diagnóstico, a chance de serem encaminhadas para a média e alta complexidade foi de 135% (OR=1,69, IC95% 0,93;3,08) nos transtornos não inflamatórios do trato genital feminino, 200% (OR=0,98, IC95% 0,23;4,02) nas doenças da mama, 300% (OR=1,51, IC95% 0,47;4,83) nos transtornos inflamatórios do trato genital feminino, sem predomínio entre os diagnósticos. CONCLUSÃO As mulheres climatéricas e na pós-menopausa acima de 50 anos e tabagistas com diagnósticos de transtornos não inflamatórios do trato genital feminino e inflamatórios, bem como doenças da mama, foram as mais direcionadas para ambulatório cirúrgico na média e alta complexidade.

SUMMARY OBJECTIVE The association between gynecological diagnoses and their distribution across healthcare sectors benefits health promotion and the identification of topics for continued education of gynecological care. This study aimed to identify healthcare diagnoses and referral flow in climacteric women. METHODS This is a cross-sectional study conducted at the Women’s Health Clinic of the University Hospital, University of São Paulo, with a reference to gynecology and training for Residents of Family and Community Medicine, between 2017 and 2018. The medical records of 242 women whose sociodemographic and clinical information, gynecological diagnoses, and distribution of healthcare services (primary, secondary, and tertiary) had been processed were collected. Statistical analysis included the chi-square test and odds ratio. RESULTS Smoking (OR = 2.27, 95% CI 1.05–4.89; p = 0.035) was associated with the referral of climacteric women to higher complexity services. Considering the distribution of non-oncological diagnoses in climacteric patients, the chance of women being referred to medium- and high-complexity health services presented a 2-fold increase in cases of breast diseases, a 2.35-fold increase in cases of noninflammatory disorders of the female genital tract, and a 3-fold increase in cases of inflammatory diseases of the pelvic organs. CONCLUSION Climacteric women aged over 55 years, postmenopausal women, and smoking women were most frequently referred to medium- and high-complexity outpatient surgery.

Abstract Background: The aim of this study was to evaluate the QoL of patients undergoing heart valve replacement using the SF-36 questionnaire, compare it between patients with mechanical prosthesis and patients with bioprosthesis, and correlate the results with sociodemographic variables. Objective: To assess the QoL of patients undergoing heart valve replacement and compare it between patients with bioprosthetic valves and patients with mechanical prosthetic valves. Methods: We included 36 consecutive patients (16 men) with a mean age of 51 years and six months, who underwent mitral or aortic valve replacement from September 2007 to December 2011. The study was conducted between March and May 2012 and involved the application of the SF-36 survey and a sociodemographic questionnaire. Statistical tests were performed, and data are expressed as absolute frequency and percentile, and median and interquartile range (P25 and P75) (Mann-Whitney test), considering a significance of 95%. Results: The average time of surgery was 32.5 months (8-61 months). Participants were asked about the practice of physical activity, and 41.7% were physically active. For the SF-36 domains, the highest scores were observed for the social domain whereas the lowest scores were found for mental health, with a mean of 89.25 and 54.44, respectively. In the statistical analysis, we found statistically higher values in emotional functional for patients with mechanical valve prosthesis (p = 0.0084). Conclusion: The QoL of the patients undergoing heart valve replacement improves considerably after the surgery, except for the mental health domain, probably due to the low practice of physical activity. The type of prosthesis seems not to influence the QoL or the patients in the late postoperative period.

RESUMO Objetivo: Analisar a associação da anemia com a vulnerabilidade socioeconômica de pré-escolares de creches públicas da cidade de Taubaté, SP, Brasil. Métodos: Trata-se de um estudo transversal com amostra probabilística que analisou 363 crianças assistidas em creches públicas de regiões de baixa e alta renda de Taubaté. A concentração de hemoglobina (Hb), variável dependente, foi obtida por meio de punção digital, considerando anêmicas as crianças com concentração de Hb<11,0 g/dL. As variáveis independentes como condições socioeconômicas e demográficas foram coletadas por questionário semiestruturado. Resultados: A prevalência de anemia por deficiência de ferro foi de 19,3% entre os pré-escolares. As crianças das creches de elevada vulnerabilidade socioeconômica apresentaram concentração de Hb estatisticamente menor do que aquelas de região não vulnerável (p<0,05). Conclusões: A menor concentração de Hb em pré-escolares está associada à localização das creches em região de vulnerabilidade socioeconômica, uma vez que as crianças que frequentam tais creches enfrentam condições adversas familiares, como baixa renda, mães que trabalham e com baixa escolaridade, embora recebam benefício social e acompanhamento pelos serviços públicos de saúde.

ABSTRACT Objective: To analyze the association of anemia with the socioeconomic vulnerability of preschoolers in public day care centers, in the city of Taubaté, SP, Brazil. Methods: This is a cross-sectional study with a probabilistic sample that analyzed 363 children assisted in public day care centres in low-income and high-income areas of Taubaté, SP, Brazil. The hemoglobin concentration (Hb), dependent variable, was obtained by digital puncture, considering anemic children with Hb concentration <11.0 g/dL. The independent variables such as socioeconomic and demographic conditions were collected by a semi-structured questionnaire. Results: The prevalence of iron deficiency anemia was 19.3% among preschoolers. Children from day care centers with high socioeconomic vulnerability had lower Hb concentration than those from a non-vulnerable area (p<0.05). Conclusions: The lower concentration of hemoglobin in preschoolers is associated with the location of day care centers in an area of socioeconomic vulnerability. Children attending these day care centers face adverse family conditions such as low income, working mothers, and mothers with low schooling, though they receive social benefits and monitoring by public health services.

Resumo Objetivo Investigar a ação da testosterona (T) isolada ou associada ao benzoato de estradiol (EB) na proliferação e apoptose de mamas de ratas ovariectomizadas. Métodos Um total de 48 ratas Wistar castradas foram divididas em 6 grupos, e cada um foi submetido a um dos seguintes tratamentos durante 5 semanas: 1) controle; 2) BE 50 mcg/dia + T 50mcg/dia; 3) T 50 mcg/dia; 4) BE 50 mcg + T 300mcg/dia; e) T 300 mcg/dia; e f) BE 50 mcg/dia. Após o tratamento, o tecido mamário foi submetido a análise histológica e avaliação de imunoexpressão de marcadores de proliferação (antígeno nuclear de células proliferantes, PCNA) e apoptose (caspase-3). Resultados Houve diferença estatisticamente significante entre os grupos com relação às microcalcificações e à atividade secretora, com maior prevalência nos grupos tratados com BE. Não houve diferença entre os grupos quanto à atrofia, mas houve maior prevalência de atrofia nos grupos que receberam T versus os que receberam BE+ T. Houve diferença entre os grupos quanto ao ANCP (p= 0,028), com maior expressão no grupo BE+ T 300 mcg/dia. Com relação à caspase-3, não houve diferença entre os grupos, mas, no grupo BE+ T 300 mcg/dia, a expressão foi maior do que no grupo de T isolada. Conclusão A T isolada não apresentou efeito proliferativo do tecido mamário, contrariamente ao EB. A T em associação ao EB pode diminuir ou não a proliferação, a depender da dose de T.

Abstract Objective To investigate the action of testosterone (T), isolated or associated with estradiol benzoate (EB), on the proliferation markers and apoptosis of breasts of ovariectomized rats. Methods A total of 48 castrated female Wistar rats were divided into 6 groups, and each of them were submitted to one of the following treatments for 5 weeks: 1) control; 2) EB 50 mcg/day + T 50 mcg/day; 3) T 50mcg/day; 4) EB 50 mcg +T 300 mcg/day; 5) T 300 mcg/day; and 6) EB 50 mcg/day. After the treatment, the mammary tissue was submitted to a histological analysis and immunoexpression evaluation of proliferation markers (proliferating cell nuclear antigen, PCNA) and apoptosis (caspase-3). Results There was a statistically significant difference among the groups regarding microcalcifications and secretory activity, with higher prevalence in the groups treated with EB. There was no difference among the groups regarding atrophy, but a higher prevalence of atrophy was found in the groups that received T versus those that received EB +T. There was a difference among the groups regarding the PCNA (p = 0.028), with higher expression in the group submitted to EB +T 300 mcg/day. Regarding caspase-3, there was no difference among the groups; however, in the group submitted to EB +T 300 mcg/day, the expression was higher than in the isolated T group. Conclusion Isolated T did not have a proliferative effect on the mammary tissue, contrary to EB. Testosterone in combination with EB may or may not decrease the proliferation, depending on the dose of T.

Abstract We present a case of a female adolescent with severe acute Chagas myocarditis, acquired by oral transmission in an endemic area in the Brazilian western Amazon, who had electrocardiographic changes normalized after empirical treatment with the antiparasitic drug benznidazole combined with conventional treatment for severe heart failure.

RESUMO O câncer de mama é comum em mulheres, mas sua etiologia ainda não é totalmente compreendida. Vários fatores podem contribuir para sua gênese, genética, estilo de vida e meio ambiente. A melatonina pode estar envolvida no processo de câncer de mama. Portanto, o objetivo deste estudo é avaliar a influência dos níveis de melatonina no câncer de mama por meio de uma revisão sistemática e meta-análise. Realizamos uma revisão sistemática de acordo com as recomendações do Prisma. Os principais bancos de dados, Medline, Embase e Cochrane, foram consultados. Não houve restrição quanto ao ano de publicação e idioma. Os dados de revisão sistemática obtidos de abril de 2017 a setembro a 2017 foram analisados. A meta-análise foi conduzida pelo programa RevMan 5.3 fornecido pela Cochrane Collaboration. De um total de 570 artigos, nove foram incluídos nesta revisão. As análises foram conduzidas em mulheres com câncer de mama e pacientes controle, dos quais 10% e 90% estavam no período reprodutivo e após a menopausa, respectivamente. O nível mais baixo de melatonina foi encontrado em aproximadamente 55% dos estudos com câncer de mama na pós-menopausa. As meta-análises de estudos demonstraram os baixos níveis de melatonina em doentes com câncer da mama (n=963), em comparação com os pacientes de controle (n=1.332), sendo a diferença de médias entre os estudos da −3,54 (CI −6,01, −1,06). Outra diferença é demonstrada nas comparações entre pacientes fumantes, sendo a diferença da média entre 1,80 [0,97-2,63]. Nossos dados sugerem que baixos níveis de melatonina podem ser um fator de risco para câncer de mama.

SUMMARY Breast Cancer is common in women, but its etiology is not yet fully understood. Several factors may contribute to its genesis, such as genetics, lifestyle, and the environment. Melatonin may be involved in the process of breast cancer. Therefore, the aim of this study is to evaluate the influence of the levels of melatonin on breast cancer through a systematic review and meta-analysis. We performed a systematic review according to PRISMA recommendations. The primary databases MEDLINE, Embase, and Cochrane were consulted. There was no restriction on the year of publication and language. Data of systematic reviews from April 2017 to September to 2017 were analyzed. The meta-analysis was conducted using RevMan 5.3 software provided by the Cochrane Collaboration. From a total of 570 articles, 9 manuscripts were included in this review. They analy onzed women with breast cancer and control patients, of which 10% and 90% were in the reproductive period and after menopause, respectively. The lowest level of melatonin was found in approximately 55% of studies with breast cancer in post-menopause. The metanalyses of the studies demonstrated low levels of melatonin in breast cancer patients (n=963) compared with control patients (n= 1332), with a mean difference between the studies of −3.54 (CI −6.01, −1.06). Another difference found was in the comparison between smoking patients, with an average difference between 1.80 [0.97-2.63]. Our data suggest that low levels of melatonin might be a risk factor for breast cancer.