Author/Authors :
Bica، نويسنده , , Claudia Giuliano and de Moura da Silva، نويسنده , , Leonardo Leiria and Toscani، نويسنده , , Nadima Vieira and Zettler، نويسنده , , Clلudio Galleano and do Valle Gottlieb، نويسنده , , Maria Gabriela and Alexandre، نويسنده , , Clلudio Osmar Pereira and Graudenz، نويسنده , , Mلrcia Silveira and Mânica da Cruz، نويسنده , , Ivana Beatr، نويسنده ,
Abstract :
We studied the possible association between Ala16Val manganese-dependent superoxide dismutase (MnSOD) gene genotypes and breast cancer lymph node status because previous investigations suggested an association between the AA genotype and breast cancer. We included 281 women (188 controls and 93 cases of invasive breast cancer with axillary lymph node metastasis (LN+) and without lymph node metastasis (LN–). DNA was extracted from paraffin-embedded tumor tissue or peripheral blood leukocytes, and MnSOD polymorphism was determined by polymerase chain reaction—restriction fragment length polymorphism techniques. In addition, the immunohistochemical profile (p53, Ki-67 and estrogen/progesterone receptors) was also compared between invasive breast cancer groups and different MnSOD genotypes. The frequency of the VV genotype was higher in the LN+ group than in the control and LN– groups (χ2 = 5.081, P = 0.02). Subjects with LN+ breast cancer (LN+ group) showed a higher incidence of VV genotype carriers associated with positive Ki-67 marker. Subjects with LN+ breast cancer (LN+ group) showed a higher incidence of VV genotype carriers associated with negative p53 marker. Despite the fact that the AA genotype is well established as being associated with an increased risk of breast cancer, the VV genotype may be associated with a higher metastatic potential, suggesting that MnSOD imbalance is the condition associated with carcinogenesis.
