Expressão dos filamentos intermediários no diagnóstico dos tumores mamários de cadelas

Immunohistochemical evaluation was performed to study the histogenesis of canine mammary tumors and to contribute to a better understanding of their classification. Monoclonal antibodies specific for different types of intermediate filaments (cytokeratins, vimentin, α-actin) were used. Epithelial cells stained positively for cytokeratins and their expression was lost as the malignant transformation occurs. Myoepithelial cells stained positively for vimentin and α-actin. In contrast to vimentin, α-actin lost the expression as the cartilaginous or osseous metaplasia occurs. Immunohistochemical evaluation with monoclonal antibodies proved to be efficient for identification of tumor histogenesis.

Missing association between telomerase activity and clinicopathological features in patients with early stage carcinoma of the cervix

Objectives: This study was undertaken to evaluate the association between the telomerase activity in the tumor and clinicopathological findings in patients with stage IB-IIA (FIGO) carcinoma of the cervix. Methods: Thirty-eight patients with carcinoma of the cervix submitted to radical hysterectomy were prospectively from January 1998 to November 2001. Samples from the tumor were taken and analyzed by the telomerase PCR-TRAP-ELISA kit. Clinicopathological characteristics such as age, stage, tumor size, grade of differentiation, lymphatic vascular space invasion (LVSI), parametrial involvement and status of pelvic lymph nodes were also recorded. Results: Patient's mean age was 49.3 ± 1.99 years (29-76 years). The clinical stage (FIGO) was IB in 35 patients (92.1%) and IIA in 3 patients (7.9%). The histological classification identified squamous cell carcinoma in 33 patients (86.8%) and adenocarcinoma in 5 patients (13.2%). There was no association between age, clinical stage, histological classification, tumor size, grade of differentiation and presence of LVSI with tumoral telomerase activity. The telomerase activity was not associated with the presence of vaginal involvement (P = 0.349), parametrium involvement (P = 0.916), pelvic lymph node metastasis (P = 0.988) or tumoral recurrence (P = 0.328) in patients with carcinoma of the cervix. Conclusions: Telomerase activity in the tumor is not associated with clinicopathological findings or tumor recurrence in patients with early stage cervical carcinoma. © 2006 Springer-Verlag.

Overexpression of ANXA1 in Penile Carcinomas Positive for High-Risk HPVs

The incidence of penile cancer varies between populations but is rare in developed nations. Penile cancer is associated with a number of established risk factors and associated diseases including phimosis with chronic inflammation, human papillomavirus (HPV) infection, poor hygiene and smoking. The objective of this study was to identify genes related to this type of cancer. The detection of HPV was analyzed in 47 penile squamous cell carcinoma samples. HPV DNA was detected in 48.9% of penile squamous cell carcinoma cases. High-risk HPV were present in 42.5% of cases and low-risk HPV were detected in 10.6% of penile squamous cell carcinomas. The RaSH approach identified differential expression of Annexin A1 (ANXA1), p16, RPL6, PBEF1 and KIAA1033 in high-risk HPV positive penile carcinoma; ANXA1 and p16 were overexpressed in penile squamous cells positive for high-risk HPVs compared to normal penile samples by qPCR. ANXA1 and p16 proteins were significantly more expressed in the cells from high-risk HPV-positive penile carcinoma as compared to HPV-negative tumors (p<0.0001) independently of the subtype of the carcinoma. Overexpression of ANXA1 might be mediated by HPV E6 in penile squamous cell carcinoma of patients with high-risk HPVs, suggesting that this gene plays an important role in penile cancer. © 2013 Calmon et al.

Preditores Clínicos e Histopatológicos de Tumor Trofoblástico Gestacional pós-Mola Hidatiforme Completa

Objetivo: definir os preditores clínicos e histopatológicos mais eficientes da evolução da mola hidatiforme completa (MHC) para tumor trofoblástico gestacional (TTG). Métodos: estudo prospectivo clínico e histopatológico de todas as portadoras de MHC, atendidas entre 1990 e 1998 no Hospital das Clínicas de Botucatu -- UNESP. A avaliação clínica pré-esvaziamento molar classificou a gravidez molar em: MHC de alto risco e MHC de baixo risco. Foram analisados os preditores clínicos para TTG, estabelecidos por Goldstein et al.¹ e por outros autores2--10. A avaliação histopatológica incluiu a determinação do diagnóstico de MHC, segundo os critérios de Szulman e Surti11, e o reconhecimento dos fatores de risco para TTG, de Ayhan et al.8. Os preditores clínicos e histopatológicos foram correlacionados com o desenvolvimento de TTG pós-molar. Resultados: em 65 portadoras de MHC, cistos do ovário maiores que 6 cm e tamanho uterino maior que 16 cm foram os preditores clínicos mais eficientes de TTG. A proliferação trofoblástica, a atipia nuclear, a necrose/hemorragia, a maturação trofoblástica e a relação cito/sinciciotrofoblasto não foram preditores significativos para TTG. A correlação entre preditor clínico e histopatológico para o desenvolvimento de TTG não foi possível porque nenhum parâmetro histopatológico foi significativo. Conclusões: mais estudos são necessários para avaliar possíveis preditores de persistência (TTG) e sua aplicação no contexto clínico das MHC. Enquanto isso, a determinação seriada de hCG sérico permanece o único indicador prognóstico seguro para TTG pós-MHC.

Proliferating cell nuclear antigen (PCNA) in non-Hodgkin's lymphomas: Correlation with working formulation and Kiel classification in formalin-fixed paraffin-embedded material

PCNA is a 36-KD proliferating cell nuclear antigen associated with the cell cycle. The immunocytochemical detection of PCNA represents a useful tool for the study of tumor proliferation activity. This study documents the detection of PCNA, using antibody PC 10 in formalin-fixed, paraffin-embedded tissue, and correlates the proliferative activity of the non-Hodgkin's lymphomas (NHL) with histological grading assessed by the International Working Formulation (WF) and Kiel classification. In 92 cases of NHLs we found a strong correlation between the PCNA index and lymphoma grading. Statistically significant differences were also found between the proliferative index (PI) in low and high grade lymphomas according to the Kiel classification (t = 9.519; p < 0.001) and between low, intermediate and high grade lymphomas according to the WF classification (F = 79.01; p < 0.001). In the Kiel classification the mean of low grade lymphomas was 39.5% and of high grade 75.7%. In the WF the average of low grade lymphomas was 29.7%, intermediate 53.1% and high 75.1%. Although the differences among the groups had been significant, we found variations inside each histological subgroup in both classifications. The intermediate lymphomas were the most heterogeneous group, with PI inside the same histologic subtypes coincident with low and high grade lymphomas. Since PCNA may be used as a marker of cell proliferation in clinical studies to estimate the biological aggressiveness of lymphomas, its determination in intermediate grade NHL could be very useful to evaluate individual cases in this group and determine prognosis and probably the appropriate therapy.

Análise mutacional da região dos exons 5 a 8 do gene supressor de tumor p53 em neoplasias mamárias caninas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise multifatorial de segundo tumor primário em pacientes com carcinoma espinocelular primário de boca: estudo retrospectivo de 848 casos

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

Análise mutacional do gene supressor de tumor TP53 e imunorreatividade da p53 em linfomas caninos

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

Tumor venéreo transmissível canino: critérios citológicos de malignidade e caracterização citomorfológica correlacionada a imunocitoquímica e lesões de DNA

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização do infiltrado inflamatório e avaliação dos marcadores de prognóstico Ki-67, p53, receptor de estrógeno e progesterona no tumor mamário maligno de cadelas

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

Development of a CAD system for automatic classification of microcalcifications based on FPGA

This paper presents a Computer Aided Diagnosis (CAD) system that automatically classifies microcalcifications detected on digital mammograms into one of the five types proposed by Michele Le Gal, a classification scheme that allows radiologists to determine whether a breast tumor is malignant or not without the need for surgeries. The developed system uses a combination of wavelets and Artificial Neural Networks (ANN) and is executed on an Altera DE2-115 Development Kit, a kit containing a Field-Programmable Gate Array (FPGA) that allows the system to be smaller, cheaper and more energy efficient. Results have shown that the system was able to correctly classify 96.67% of test samples, which can be used as a second opinion by radiologists in breast cancer early diagnosis. (C) 2013 The Authors. Published by Elsevier B.V.

Classificação morfológica e imunostoquímica em microarranjo de tecido (TMA) de linfomas não-Hodgkin em cães conforme os critérios da Histological Classification od Hematopoietic Tumors of Domestic Animals (WHO)

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

Evaluation of argyrophilic nucleolar organizer regions in oral tumor progression

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