Browsing by Author "Esteves, J"
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- O C-erb-B2/HER2 no Cancro Gástrico: Importância Fisiopatológica em Época de Novas TerapêuticasPublication . Fradique, AC; Cabrita, F; Pupo, A; Quaresma, A; Silva, G; Silva, G; Costa, L; Esteves, J; Marques, M; Pina, F; Oliveira, M; Gomes, D
- Esofagite EosinofílicaPublication . Santos, L; Sousa, MI; Simões, JC; Esteves, J; Rio-Tinto, R
- Esophageal Cancer: Results of the Trimodal Approach in a Medium-Volume Multidisciplinary UnitPublication . Carrola Gomes, D; Caldeira Fradique, A; Costa, L; Quaresma, L; Gualdino Silva, J; Vasconcelos, V; Sacadura, J; Oliveira, M; Esteves, J; Mateus Marques, R; Fernandez, G; Guedes da Silva
- Gastric MANECs: a Casuistic of a Portuguese CentrePublication . Aguiar, C; Caldeira Fradique, A; Quaresma, L; Matias, R; Gualdino Silva, J; Vasconcelos, V; Sacadura, J; Oliveira, M; Cabrita, F; Mateus Marques, R; Esteves, J; Costa, L; Fernandez, G; Guedes da Silva
- HCV Infection in Patients with Hereditary Bleeding DisordersPublication . Caiado, A; Antunes, M; Santos, AL; Esteves, J; Diniz, MJIntroduction: Hepatitis C virus (HCV) infection in patients with hereditary bleeding disorders (HBDs), as a consequence of treatment with transfusion of human bloodderived components between the late 1970s and 1980s, represents a major health concern. Objectives: Assessment and evaluation of the burden of HCV infection, its complications, and treatment in a population of patients with HBDs. Methods: Analysis of a series of 161 patients with HBDs treated in the Immunohemotherapy Service of the Centro Hospitalar de Lisboa Central (Lisboa, Portugal), consultation and systematic review of the patients clinical processes, elaboration of a database comprising the information gathered; and statistical study of its variables: age, gender, degree of severity of the bleeding disorder, treatment modality, and major and minor complications of HCV infection. Results: Sixty-five (40%) of the 161 patients have HCV infection. Among the patients with hemophilia A, 36% are severe and 62% of those have HCV infection; 9% moderate with 57%; 25% mild with 20%. In the hemophilia B group, 8% are severe with 23% infected and 6% moderate or mild with 10%. Concerning the patients with von Willebrand disease, 12% have type 2 with 16% infected and 4% have type 3 with 86%. Conclusions: HCV infection represents a very significant complication of the treatment employed in the past in the studied population. Considering that most of these patients were infected in the late 1970s and early 1980s, and the natural evolution of HCV infection in patients without bleeding disorders, it is expected that the prevalence of major complications will rise significantly in the coming years. Prophylactic measures should be implemented to enhance the follow-up protocols and prevent further development of liver damage in these patients.
- Índice Proliferativo Ki-67 no Cancro GástricoPublication . Nabais, C; Fradique, AC; Costa, L; Cabrita, F; Pupo, A; Quaresma, L; Silva, G; Mateus Marques, R; Esteves, J; Guedes da Silva, J; Oliveira, M; Pina, FIntrodução: O cancro gástrico representa ainda uma das principais causas de mortalidade por doença oncológica a nível mundial, apesar da evolução substancial no seu tratamento. Diversos marcadores biológicos têm sido introduzidos com intuito prognóstico da doença. A proteína Ki-67 através de técnicas imunocitoquímicas tem sido utilizada como um indicador da actividade proliferativa tumoral. No cancro gástrico o seu valor prognóstico ainda não foi estabelecido, sendo os resultados na literatura controversos. Este estudo pretende avaliar o significado biológico do índice proliferativo Ki-67 no cancro gástrico. Métodos: Foram estudados 50 doentes com cancro gástrico submetidos a cirurgia ressectiva. A proteína Ki-67 foi analisada por imunocitoquímica nas peças operatórias. O índice proliferativo Ki-67 foi definido como a percentagem de células tumorais positivas para a proteína. Resultados: Dos 50 casos estudados foi obtido um índice proliferativo Ki-67 de 68.9 ± 24.1%. Foram correlacionadas as variáveis sexo, idade, localização e dimensão tumoral, classificação TNM, estadio e tipo histológico de Lauren. Apenas esta última revelou diferenças estatisticamente significativas entre os respectivos tipos (P = 0.004). Conclusão: Os achados encontrados não permitem definir inequivocamente o valor prognóstico do índice proliferativo Ki-67. Será importante prosseguir o estudo com uma amostra populacional superior, para que conclusões estatisticamente significativas possam ser elaboradas.
- Ki-67 Proliferation Index in Gastric Cancer - Biologic SignificancePublication . Nabais, C; Caldeira Fradique, A; Oliveira, M; Quaresma, L; Gualdino Silva, J; Vasconcelos, V; Sacadura, J; Costa, L; Cabrita, F; Mateus Marques, R; Esteves, J; Fernandez, G; Guedes da SilvaObjectives/Introdution: Ki-67 protein has been used as an indicator of proliferation activity in tumor cells. In gastric cancer the prognostic value has not been fully understood. This study was designed to assess the biologic significance of Ki-67 proliferation index (PI) in gastric cancer. Material/Methods: Seventy-two patients with gastric cancer were evaluated. These patients underwent gastric resection, and the tumor tissue was stained immunohistochemically. Ki-67 PI was defined as the percentage of tumor cells positive for Ki-67. Ki-67 PI was correlated with clinicopathological characteristics and patient survival. Results: A low Ki-67 PI (less than or equal to 50%) was associated with poorly differentiated histology - diffuse type (p=0.009) and signet ring cells (p=0.004) - and younger age (p=0.022). A worse prognosis in patients with low Ki-67 PI was also found (a mean survival of 41.8 vs 63 months for high Ki-67 PI group), but not statistically significant (p=0.623, log rank test). Discussion/Conclusion: We found an inversely correlation between Ki-67 PI and histological differentiation grade. Patients in group with low Ki-67 PI are younger, with poorly differentiated histology and have a lower mean survival. Like other studies already suggested, we may have two different tumors phenotypes - highly invasive with low proliferative capability, and less invasive potential with higher proliferative ability. However, in this sample, no significant prognostic value was achieved between both.
- MRI of Gastric Cancer: T and N Staging with Pathologic CorrelationPublication . Marques, R; Leal, C; Carvalho, R; Mendonça, P; Cordeiro, AR; Costa, L; Cabrita, F; Esteves, J; Fradique, AC
- Neuroendocrine Carcinoma of the Esophagus: Single-Center Experience of 5 CasesPublication . Corado, S; Caldeira Fradique, A; Figueiredo, J; Quaresma, L; Pupo, A; Sacadura, J; Vasconcelos, V; Gualdino Silva, J; Fernandez, G; Costa, L; Mateus Marques, R; Oliveira, M; Esteves, J; Guedes da Silva; Barroso, E
- Next-Generation Sequencing of Hereditary Hemochromatosis-Related Genes: Novel Likely Pathogenic Variants Found in the Portuguese PopulationPublication . Faria, R; Silva, B; Silva, C; Loureiro, P; Queiroz, A; Fraga, S; Esteves, J; Mendes, D; Fleming, R; Vieira, L; Gonçalves, J; Faustino, PHereditary hemochromatosis (HH) is an autosomal recessive disorder characterized by excessive iron absorption resulting in pathologically increased body iron stores. It is typically associated with common HFE gene mutation (p.Cys282Tyr and p.His63Asp). However, in Southern European populations up to one third of HH patients do not carry the risk genotypes. This study aimed to explore the use of next-generation sequencing (NGS) technology to analyse a panel of iron metabolism-related genes (HFE, TFR2, HJV, HAMP, SLC40A1, and FTL) in 87 non-classic HH Portuguese patients. A total of 1241 genetic alterations were detected corresponding to 53 different variants, 13 of which were not described in the available public databases. Among them, five were predicted to be potentially pathogenic: three novel mutations in TFR2 [two missense (p.Leu750Pro and p.Ala777Val) and one intronic splicing mutation (c.967-1G>C)], one missense mutation in HFE (p.Tyr230Cys), and one mutation in the 5'-UTR of HAMP gene (c.-25G>A). The results reported here illustrate the usefulness of NGS for targeted iron metabolism-related gene panels, as a likely cost-effective approach for molecular genetics diagnosis of non-classic HH patients. Simultaneously, it has contributed to the knowledge of the pathophysiology of those rare iron metabolism-related disorders.