Post-surgery radiation in early breast cancer: survival analysis of registry data.
Radiother Oncol
; 64(3): 281-90, 2002 Sep.
Article
em En
| MEDLINE
| ID: mdl-12242116
BACKGROUND AND PURPOSE: Overviews of randomized trials have shown a small survival advantage with post-surgery radiation in early breast cancer. The present study attempts to extend this observation through a systematic analysis of population data. MATERIALS AND METHODS: This retrospective cohort study used the Surveillance, Epidemiology, and End Results (SEER) data on 83,776 women with breast cancer diagnosed between 1988 and 1997, stage T1-T2, node negative or node positive. The analysis was performed using the proportional hazard models. RESULTS: Radiation was associated with a reduced mortality after breast-conserving surgery in node negative patients (hazard ratio 0.757; 95% confidence interval 0.709-0.809; using total mastectomy without radiation as reference) and in node positive patients (hazard ratio 0.777; 0.717-0.842), and after total mastectomy in node positive patients (hazard ratio 0.885; 0.815-0.961). Radiation was associated with an increased hazard ratio of 1.271 (1.080-1.496) after total mastectomy in node negative patients. Without radiation, breast-conserving surgery in node negative patients was associated with an increased hazard ratio (1.167; 1.036-1.314); a similar increase was not observed in node positive patients (hazard ratio 1.011; 0.884-1.155). In all cases, the best survival rates were found with combined breast-conserving surgery and radiation. CONCLUSION: The available data indicate that post-surgery radiation provides a survival advantage irrespective of the type of surgery in node positive patients. Likewise, survival advantage was observed with post-surgery radiation and breast-conserving procedure in node negative patients.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Mama
/
Sistema de Registros
Tipo de estudo:
Etiology_studies
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Incidence_studies
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Adult
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Aged
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Female
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Humans
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Middle aged
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article