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Int J Oncol ; 28(4): 995-1002, 2006 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-16525651

RESUMO

p53 wild-type is a tumor suppressor gene involved in DNA gene transcription or DNA repair mechanisms. When damage to DNA is unrepairable, p53 induces programmed cell death (apoptosis). The mutant p53 gene is the most frequent molecular alteration in human cancer, including breast cancer. Here, we analyzed the genetic alterations in p53 oncogene expression in 55 patients with breast cancer at different stages and in 8 normal women. We measured by ELISA assay the serum levels of p53 mutant protein and p53 antibodies. Immunohistochemistry and RT-PCR using specific p53 primers as well as mutation detection by DNA sequencing were also evaluated in breast tumor tissue. Serological p53 antibody analysis detected 0/8 (0%), 0/4 (0%) and 9/55 (16.36%) positive cases in normal women, in patients with benign breast disease and in breast carcinoma, respectively. We found positive p53 mutant in the sera of 0/8 (0.0%) normal women, 0/4 (0%) with benign breast disease and 29/55 (52.72%) with breast carcinoma. Immunohistochemistry evaluation was positive in 29/55 (52.73%) with mammary carcinoma and 0/4 (0%) with benign breast disease. A very good correlation between p53 mutant protein detected in serum and p53 accumulation by immunohistochemistry (83.3% positive in both assays) was found in this study. These data suggest that detection of mutated p53 could be a useful serological marker for diagnostic purposes.


Assuntos
Biomarcadores Tumorais/genética , Neoplasias da Mama/patologia , Mutação , Proteína Supressora de Tumor p53/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Autoanticorpos/sangue , Biomarcadores Tumorais/sangue , Biomarcadores Tumorais/imunologia , Neoplasias da Mama/sangue , Neoplasias da Mama/genética , Carcinoma in Situ/sangue , Carcinoma in Situ/genética , Carcinoma in Situ/patologia , Carcinoma Ductal de Mama/sangue , Carcinoma Ductal de Mama/genética , Carcinoma Ductal de Mama/patologia , Ensaio de Imunoadsorção Enzimática , Feminino , Humanos , Imuno-Histoquímica/métodos , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Proteína Supressora de Tumor p53/sangue , Proteína Supressora de Tumor p53/imunologia
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