CONTEXT AND OBJECTIVE: Recently, breast-conserving surgery (BCS) has been replacing mastectomy for breast cancer treatment. The aim of this study was to evaluate the changes in mastectomy and BCS rates and the factors relating to these shifts. A shift from mastectomy towards BCS was observed (P < 0.001). In multivariate analysis, earlier year of surgery (P < 0.001), larger tumor size (P < 0.001), having at least one positive axillary lymph node (P < 0.001) and patients' age greater than 68 years (P = 0.007) were predictors of mastectomy. CONCLUSIONS: There was a shift from mastectomy towards BCS in our institution over the years. This may reflect consolidation of BCS (plus radiotherapy) as an equivalent treatment to mastectomy in terms of survival and a shift to earlier diagnosis for the disease.RESUMO CONTEXTO E OBJETIVO: Recentemente, a cirurgia conservadora tem substituído a mastectomia para tratamento cirúrgico do câncer de mama. O objetivo deste estudo é avaliar as mudanças nas taxas de mastectomia e cirurgia conservadora e os fatores relacionados a essas mudanças. correspondentes a cirurgia conservadora. A cirurgia conservadora se tornou mais frequente ao longo dos anos (P < 0,001). Em análise multivariada, ano mais precoce da cirurgia (P < 0,001), maior tamanho tumoral (P < 0,001), ter ao menos um linfonodo axilar positivo (P < 0,001) e idade maior de 68 anos (P = 0,007) foram preditores de mastectomia. CONCLUSÕES: As cirurgias conservadoras se tornaram mais frequentes em relação às mastectomias ao longo dos anos. Isso pode refletir a consolidação da cirurgia conservadora (associada a radioterapia) como equivalente à mastectomia em termos de sobrevida, bem como diagnóstico mais precoce da doença.I MD, PhD Student. General Surgeon,
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