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Numerous factors have been studied to establish more secure prognostic criteria in breast cancer patients. This study estimates five-year survival rates and principal prognostic factors related to tumor characteristics in women with invasive breast cancer and submitted to surgery at the National Cancer Institute, Rio de Janeiro, Brazil, from May 1995 to July 1996. Study variables were: lymph node status, tumor size, aggressiveness grade, and presence of estrogen and progesterone receptors. Survival functions were calculated according to the Kaplan-Meyer method. The Cox proportional hazards model was used to evaluate prognostic factors. Five-year survival was 75% for all women and 64% for those with node involvement. Multivariate analyses identified node involvement as the strongest predictor of outcome; a positive estrogen receptor test was associated with a better prognosis. These findings highlight the need for studies to assess new variables to be added to known factors in order to better orient therapy for breast cancer.

Características tumorais e sobrevida de cinco anos em pacientes com câncer de mama admitidas no Instituto Nacional de Câncer, Rio de Janeiro, Brasil