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Local Failure Is Responsible for the Decrease in Survival for Patients With Breast Cancer Treated With Conservative Surgery and Postoperative Radiotherapy

From the Department of Radiation Oncology, Hôtel-Dieu de Québec Hospital, Université Laval, Québec, Canada.

Address reprint requests to Dr André Fortin, Radiation-Oncology, Hôtel-Dieu de Québec, Pavillon Carlton-Auger, 25 rue Charlevoix, Québec GIR 5C3, Canada.

PURPOSE: The aim of the present study was to evaluate the role of local failure (LF) in the survival of patients treated with lumpectomy and postoperative radiotherapy and to investigate whether LF is not only a marker for distant metastasis (DM) but also a cause.

METHODS: Charts of patients treated with breast conservative surgery between 1969 and 1991 were reviewed retrospectively. There were 2,030 patients available for analysis. The median duration of follow-up was 6 years. A Cox regression multivariate analysis was performed using LF as a time-dependent covariate.

RESULTS: Local control (LC) was 87% at 10 years. Local failure led to poorer survival at 10 years than local control (55% v 75%, P < .00). In a Cox model, local failure was a powerful predictor of mortality. The relative risk associated with LF was 3.6 for mortality and 5.1 for DM (P < .00). In patients with LF, the rate of DM peaked at 5 to 6 years, whereas it peaked at 2 years for patients with LC. The mean time between surgery and DM was 1,050 days for patients without LF and 1,650 days for patients with LF (P < .00).

CONCLUSION: Our results show that local failure is associated with an increase in mortality. The difference in the time distribution of distant metastasis for LF and LC could imply distinct mechanisms of dissemination. Local failure should be considered not only as a marker of occult circulating distant metastases but also as a source for new distant metastases and subsequent mortality.

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