Results: 20

Radiotherapy modulates expression of EGFR, ERCC1 and p53 in cervical cancer

Braz. j. med. biol. res; 51 (1), 2018
Cervical cancer is a public health problem and the molecular mechanisms underlying radioresistance are still poorly understood. Here, we evaluated the modulation of key molecules involved in cell proliferation, cell cycle and DNA repair in cervical cancer cell lines (CASKI and C33A) and in malignant tiss...

Regulação da expressão das DNA metiltransferases pelas proteínas p53 e Sp1 em carcinoma epidermóide de esôfago

O câncer de esôfago (CE) é um tumor altamente frequente e letal, correspondendo ao oitavo lugar em incidência e sexto em letalidade, dentro todos os tipos de tumores. O subtipo histopatológico mais frequente de CE é o carcinoma epidermóide de esôfago (CEE) que corresponde a aproximadamente 80% do...

Polymorphisms in methylenetetrahydrofolate reductase and cystathionine beta-synthase in oral cancer - a case-control study in southeastern Brazilians

ABSTRACT INTRODUCTION: Oral squamous cell carcinoma (OSCC) is a serious public health problem, due to its high mortality rate and worldwide rising incidence. OSCC susceptibility is mediated by interactions between genetic and environmental factors. Studies suggest that genetic variants encoding enzymes ...

Integrated analyses of copy number variations and gene differential expression in lung squamous-cell carcinoma

Biol. Res; 48 (), 2015
BACKGROUND: Although numerous efforts have been made, the pathogenesis underlying lung squamous-cell carcinoma (SCC) remains unclear. This study aimed to identify the CNV-driven genes by an integrated analysis of both the gene differential expression and copy number variation (CNV). RESULTS: A higher bur...

Genetic polymorphisms in the Cytochrome P450 family and squamous cell carcinoma of the oral cavity, pharynx and larynx

Rev. Col. Bras. Cir; 41 (5), 2014
Objective: To analyze the genetic polymorphisms of the cytochrome P450 family and their relationship with squamous cell carcinoma of the oral cavity, pharynx and larynx. Methods: We present a narrative literature review, conducted in Pubmed, Lilacs and Cochrane Databases of articles published in the last...

Expression of TRF2 and its prognostic relevance in advanced stage cervical cancer patients

Biol. Res; 47 (), 2014
BACKGROUND: Telomeres are protective caps consisted of specific tandem repeats (5'-TTAGGG-3'). Shortening of telomeres at each cell division is known as "mitotic clock" of the cells, which renders telomeres as important regulators of lifespan. TRF2 is one of the critical members of shelterin complex, whi...

Frecuencia de los polimorfismos CYP1A1*2A y deleción del gen GSTM1 en pacientes con carcinoma de células escamosas de laringe en relación al hábito tabáquico: estudio piloto en Chile

Introducción: Entre los factores de riesgo para cáncer laríngeo (CL) son relevantes el consumo de tabaco y alcohol. Estos xenobióticos son metabolizados por un grupo de enzimas, entre las cuales están CYP1A1 y GSTM1, cuyas variantes polimórficas se postulan como factores de riesgo para esta enferme...

Interacting signaling pathways in the pathogenesis of squamous cell carcinoma

Medicina (B.Aires); 60 (5 Pt 2), 2000

Genetic alterations in Ki-ras and Ha-ras genes in juvenile nasopharyngeal angiofibromas and head and neck cancer

Säo Paulo med. j; 117 (3), 1999
Context: Ras gene mutations have been associated to a wide range of human solid tumors. Members of the ras gene family (Ki-ras, Ha-ras and N-ras) are structurally related and code for a protein (p21) known to play an important role in the regulation of normal signal transduction and cell growth. The freq...

P53 overexpression in epidermoid carcinoma of the head and neck

Säo Paulo med. j; 115 (1), 1997
The theory of field cancerization in tumors of the head and neck reflects the complex oncogenesis that occurs in this region. The mechanisms that control cell proliferation at the molecular level in epidermoid carcinomas (ECs) of the upper aerodigestive tract are still unclear. Mutations in p53 are the g...