Expressão proteica das enzimas metabolizadoras de drogas no carcinoma de células escamosas de boca em pacientes jovens

• Ano de defesa: 2014
• Autor(a) principal: Caris, Adriana Rocha de [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Carcinoma de células escamosas; Aldeidos; Pacientes; Carcinoma, Squamous Cell
• Link de acesso: http://hdl.handle.net/11449/127610; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/01-09-2015/000843177.pdf

The oral squamous cell carcinoma (SCC) mainly affects smokers and chronic alcoholics between the fifth and sixth decades of life and it's relatively rare in young patients (≤ 40 years old). In the literature, there is no report regarding the protein expression of drug metabolizing enzymes in oral SCC in this age group. The induction of expression of these enzymes results in the acceleration of detoxification of toxic substances as well as in the increase of metabolites of xenobiotics and more risk of damage to AND consequently. The aim of this study was to evaluate the protein expression of enzymes involved in the biotransformation of tobacco (CYP1A1 and CYP1B1) and alcohol (ALDH1 and ALDH2) between test group (young ≤ 40 years) and control group(≥ 50 years) by the immunohistochemistry technique on tissue microarray and to correlate the results with the clinicopathologic features and prognosis of patients. Forty-one primary oral SCC were evaluated in young patients, collected in the period 1970-2007, in the Department of Head and Neck Surgery and Otorhinolaryngology, AC Camargo Hospital, Sao Paulo. These cases were compared with 59 controls with tumors in clinical stages and similar topographies. Variables between groups were compared using the x2 test. The expression of the markers was compared between groups by the Mann-Whitney test. In the analysis of overall survival, disease-specific and disease-free, the expressions of the markers were dichotomized according to the median. Kaplan-Meier graphs were constructed and the log rank test was used. The confidence level adopted was 5%. The results revealed that there was a predominance of male patients, leucoderma, smoker and drinker, with tumors located in the tongue, rather differentiated and advanced stage, without difference between the groups. In immunohistochemical analysis it was found that there was a statistical difference...