Expressão tumoral da glutationa S-transferase Pi e sobrevida global e livre de doença em mulheres com carcinoma de mama / Glutathione S-transferase Pi expression in invasive breast cancer and clinical outcome

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Introduction: The glutathione S-transferase is an enzymatic system located in the cytosol of the cells and it is responsible for the elimination of toxins. ?In vitro? studies showed that the presence of this enzymatic system in breast carcinoma cells can accelerate the elimination of the drug used in the chemotherapy. This would decrease the efficacy of this kind of treatment in women with GST Pi -positive breast cancer cells. Objectives: The scope of the present study was to evaluate the association between GST Pi-positive breast cancer and overall and disease free-survival in women with breast carcinoma submitted to chemotherapy. Methods: Between January, 1995 and July, 1997, 554 patients were undergone to breast cancer surgical treatment at CAISM-UNICAMP. Out of 554 patients, 160 were between 18 and 70 years old in the diagnosis, did not have metastatic disease, were submitted to quadrantectomy/mastectomy with free surgical margins and axillary dissection followed by adjuvant chemotherapy and had complete follow-up until August, 2006. The paraffin blocks were available for 95 of these patients. The immunohistochemical reactions were done and the GST Pi expression was correlated with the clinical data obtained from their respective medical records. Results: Of the 95 cases studied, 36 (38%) were positive for the GST Pi expression and 59 (62%) did not express the enzymatic system. The expression of GST Pi in breast cancer cells showed no relation with age, histological type, stage of disease and estrogen and progesterone receptor status. The GST Pi-positive breast cancers showed a significant relation with lower histological grade tumors and with negativity of the expression of HER-2. Also, the expression of GST Pi had no relation with overall and disease free survival after a median follow-up of 10.68 years. Conclusions: The findings of this study indicate that patients with GST Pi-positive tumors have the same prognosis as patients with GST Pi-negative tumors after chemotherapy

ASSUNTO(S)

imunohistoquimica glutathione transferase breast glutationa tansferase sobrevida immunohistochemistry survival mamas - cancer

ACESSO AO ARTIGO

Documentos Relacionados