Expressão da E-caderina em carcinoma de células escamosas e no tumor de células basais de cães

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Vulvar carcinoma in young patients and its relationship with genital warts

We report the occurrence of aggressive vulvar carcinoma associated with condyloma acuminata in three patients: under 33 years old. Discussion of the role of the human papilloma virus (HPV) in the development of vulvar cancer is also presented. Three patients with condyloma associated with aggressive vulvar squamous cell carcinoma, in situ (1 case) and invasive (2 cases), documented by biopsy and/or vulvectomy are presented. In situ hybridization (ISH) was used to characterize the subtypes of HPV. One patient with erythematous systemic lupus developed in situ carcinoma after 5 years. The other two cases also developed aggressive multicentric, invasive squamous cell carcinoma after 10 years of diagnosis of condyloma. In all cases HPV cytological abnormalities were seen throughout the pathological examination. HPV 16 and 18 were present in cells of invasive squamous cell carcinoma in cases 2 and 3. HPV 6 and 11 were detected only in the condyloma area in case 2. HPV 30 was seen only in the condyloma area in case 3. This report emphasizes the need for biopsies of all unusually persistent or treatment-resistant condylomas, particularly in young and/or immunoisuppressed patients.

Genomic instability in non-neoplastic oral mucosa cells can predict risk during 4-nitroquinoline 1-oxide-induced rat tongue carcinogenesis

4-Nitroquinotine 1-oxide (4NQO)-induced rat tongue carcinogenesis is a useful model for studying oral squamous cell carcinoma. The aim of this study was to investigate the level of DNA damage induced by 4NQO in oral mucosa cells by the single cell get (comet) assay. Mate Wistar rats were distributed into three groups of 10 animals each and treated with 50 ppm 4NQO solution by drinking water for 4, 12 or 20 weeks. Ten animals were used as negative control. Statistically significant increase of DNA damage was observed in non-neoplastic oral cells at four weeks of 4NQO administration when compared with control (P < 0.05). The level of DNA damage was directly associated with the severity of histological changes. The results suggest that histologically normal tissue is able to harbor genetically unstable cells contributing to the initiation of oral carcinogenesis. Genomic instability appears to be associated with the risk and progression of oral cancer. (C) 2004 Elsevier Ltd. All rights reserved.

Genomic instability in blood cells is able to predict the oral cancer risk: an experimental study in rats

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Expression of apoptotic and cell proliferation regulatory proteins in keratoacanthomas and squamous cell carcinomas of the skin

The aim of this study was to investigate the expression of p53, caspase-3, bcl-2, MIB-1, and PCNA to validate more objective methods to differentiate squamous cell carcinoma and keratoacanthoma, as well as to understand their pathogenesis with accuracy. A total of 52 cases of histopathologically diagnosed keratoacanthoma in the proliferative stage and 56 cases of well-differentiated squamous cell carcinoma were selected in this study. The expression was evaluated by means of immunohistochemistry. Bcl-2 immunoreactivity was weak or absent in the majority of cases, either in squamous cell carcinoma or in keratoacanthoma. PCNA-positive cells did not show differences between two lesions evaluated. on the other hand, MIB-1 was statistically significant (p<0.05) between squamous cell carcinomas and keratoacanthomas. Moreover, p53 and caspase-3 were overexpressed in squamous cell carcinomas. Together, these results suggest that the biological behavior of the well-differentiated squanous cell carcinomas of the skin may be associated with cellular proliferation and/or deregulation of cell death, indicated by increased expression of the MIB-1 and apoptotic proteins p53 and caspase-3, respectively. (C) 2007 Elsevier GrnbH. All rights reserved.

Comparação entre dois métodos de detecção de DNA de papilomavírus humano em carcinoma epidermoide de lábio

Introdução: Recentemente o papilomavírus humano (HPV) tem sido associado à carcinogênese oral. A metodologia empregada na detecção do vírus é uma das maiores causas observadas da grande variabilidade nas taxas de detecção do HPV. Objetivo: Este estudo comparou a sensibilidade de detecção do DNA do HPV em casos de carcinoma epidermoide de lábio utilizando a amplificação do DNA viral por reação em cadeia da polimerase (PCR) ou nPCR. Material e método: Foram utilizadas 33 amostras provenientes de casos de carcinoma epidermoide de lábio. Para as extrações do DNA utilizou-se o sistema QIAamp DNA Mini Kit. Como controle interno utilizou-se o gene da b-globina. Das 33 amostras iniciais, 30 foram positivas para o gene b-globina, sendo utilizadas para detectar o DNA viral. Comparou-se a amplificação do DNA viral pelos métodos da PCR com os oligonucleotídeos MY09/MY11 e nPCR, empregando-se os pares de oligonucleotídeos iniciadores MY09/MY11 e, na segunda etapa, o par GP5+/GP6+. O controle positivo para a presença do DNA do HPV utilizado foi a linhagem de células HeLa e, como controle negativo, a mistura de amplificação sem DNA. A análise dos produtos de PCR e nPCR para HPV foi realizada por eletroforese em gel de poliacrilamida a 8%. Resultados: Utilizando-se o método da PCR, a amplificação do DNA do HPV foi constatada em dois casos. Com a nPCR foi verificada presença de DNA viral em 13 das 30 amostras. Conclusão: Com a utilização da nPCR, a detecção do HPV nos casos estudados aumentou mais de seis vezes.

Implication of RNA-Binding Protein La in Proliferation, Migration and Invasion of Lymph Node-Metastasized Hypopharyngeal SCC Cells

The 5-year survival rate for oral cavity cancer is poorer than for breast, colon or prostate cancer, and has improved only slightly in the last three decades. Hence, new therapeutic strategies are urgently needed. Here we demonstrate by tissue micro array analysis for the first time that RNA-binding protein La is significantly overexpressed in oral squamous cell carcinoma (SCC). Within this study we therefore addressed the question whether siRNA-mediated depletion of the La protein may interfere with known tumor-promoting characteristics of head and neck SCC cells. Our studies demonstrate that the La protein promotes cell proliferation, migration and invasion of lymph node-metastasized hypopharyngeal SCC cells. We also reveal that La is required for the expression of beta-catenin as well as matrix metalloproteinase type 2 (MMP-2) within these cells. Taken together these data suggest a so far unknown function of the RNA-binding protein La in promoting tumor progression of head and neck SCC.

Carcinoma basalóide escamoso: uma forma rara e agressiva de câncer do esôfago e revisão da literatura

RACIONAL: O carcinoma basalóide escamoso ocorre com maior freqüência no trato aerodigestivo superior e raramente acomete o esôfago. OBJETIVO: Apresentar os aspectos clínico-patológicos e os atributos imunoistoquímicos de um paciente com carcinoma basalóide escamoso do esôfago. RELATO do CASO: Dos 134 pacientes com câncer do esôfago atendidos no Hospital Universitário de Botucatu-Unesp, São Paulo, de 1990 a 1999, somente um paciente (0,74%) apresentou carcinoma basalóide escamoso do esôfago. Tratava-se de paciente masculino, 41 anos, branco, lavrador com disfagia, regurgitação e emagrecimento há três meses. Referia tabagismo e etilismo há muitos anos. O esofagograma e o exame endoscópico revelaram lesão vegetante no terço distal do esôfago. A biópsia demonstrou neoplasia intraepitelial de alto grau associada a blocos de células basalóides que infiltravam o cório da mucosa, caracterizando o carcinoma basalóide escamoso. Os marcadores imunoistoquímicos foram positivos para o antígeno carcinoembriônico e para citoceratinas de alto peso molecular. A tomografia computadorizada revelou múltiplas metástases nos pulmões, fígado, e nódulos linfáticos regionais, documentando a fase avançada de evolução da doença. O tratamento consistiu apenas na realização de gastrostomia. O paciente apresentou queda acentuada do estado geral e evoluiu para óbito com quadro de melena quatro meses após o diagnóstico. CONCLUSÃO: O carcinoma basalóide escamoso é uma forma rara e agressiva de câncer do esôfago e o prognóstico depende do estadiamento da lesão e das condições clínicas do paciente no momento do diagnóstico.

Human papillomavirus and Epstein-Barr virus infection, p53 expression, and cellular proliferation in laryngeal carcinoma

Laryngeal carcinomas are aggressive neoplasms with controversial association with the human papillomavirus (HPV) and Epstein-Barr virus (EBV). So far, the impairment of p53 protein function and its impact on cellular proliferation has not been studied adequately in these tumors. In this work, molecular biologic techniques were used to assess the frequency of HPV and EBV in 110 squamous cell carcinomas of the larynx. In addition, accumulation of p53 and Ki-67 cell proliferation antigen expression in malignant cells was assessed by immunohistochemical analysis. High-grade HPV was found in 37.3% of cases, and none had demonstrable EBV infection. Accumulation of p53 was found in 78.2% of the cases, and it was related to a high Ki-67 labeling index and higher histologic grade. The results demonstrate association of HPV with more than one third of laryngeal carcinomas studied, mainly glottic tumors. Tumors with increased cell proliferation were more frequently high grade, with p53 accumulation and lymph node metastasis. © American Society for Clinical Pathology.

Comparative study of the behavior of p53 immunoexpression in smoking associated lesions: Reinke's edema and laryngeal carcinoma

Objective: To assess the behavior of the immunoexpression of protein p53 in Reinke's edema and laryngeal squamous cell carcinoma. Study design: retrospective. Methods: we recovered the histological paraffin blocks of patients who were subjected to Reinke's edema and laryngeal squamous cell carcinoma surgery in 2000-2011. The paraffin blocks were cut into 3-μm sections; the specimens were prepared in silanized slides (one slide for each paraffin block) and subjected to immunohistochemical reaction according to the Avidin Biotin Peroxidase method. Monoclonal primary anti-p53 antibodies were used at 1:50 dilution. Slides were examined under a light microscope at different magnitudes and results were interpreted based on the degree of brown staining in the nuclei of epithelial cells and in the extent of the fragment by using a semi-quantitative score from 0 to 3. Results: 67 slides of Reinke's edema and 60 slides of laryngeal squamous cell carcinoma were included. Scores 2 and 3 for staining of the nuclei of epithelial cells were recorded for 46 slides of Reinke's edema (68.65%) and for 57 slides of laryngeal squamous cell carcinoma (95%). As to the extent of the fragment, scores 2 and 3 were recorded for 74% slides of Reinke's edema and for 95% slides of carcinomas. Conclusion: the positive immunoexpression for protein p53, positive in 95% carcinomas and 74% Reinke's edemas, makes us aware of the possible preneoplastic condition of the latter lesion. Further studies are needed to identify and reveal the genetic changes that lead to these results. © 2013 Informa Healthcare USA, Inc.

Proliferação celular e expressão da cicloxigenase-2 como parâmetros prognósticos na ceratose actínica e no carcinoma de células escamosas cutâneo em cães

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Expressão da e-caderina e do fator de crescimento do endotélio vascular no carcinoma de células escamosas e no tumor de células basais de cães

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Detecção das proteínas p53, p63 e puma no carcinoma de células escamosas corneal de cães: Lucas Bahdour Cossi. -

Pós-graduação em Ciência Animal - FMVA

Estudo imunoistoquímico da queilite actínica, carcinoma epidermóide de lábio e carcinoma epidermóide intrabucal

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise clínica e histoquímica comparativa computadorizada pelo método da AgNOR de carcinoma espinocelular de diferentes regiões da boca de humanos

Pós-graduação em Odontologia - FOA