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Imaging, Diagnosis, Prognosis |
Authors' Affiliations: 1 Department of Medical Oncology, Sunnybrook Health Sciences Center and University of Toronto; 2 Women's College Research Institute, Women's College Hospital and University of Toronto, Toronto, Ontario, Canada
Requests for reprints: Steven A. Narod, Women's College Research Institute, 790 Bay Street, 7th Floor, Toronto, Ontario, Canada M5G 1N8. Phone: 416-351-3765; Fax: 416-351-3767; E-mail: steven.narod{at}wchospital.ca.
Purpose: To compare the clinical features, natural history, and outcomes for women with "triple-negative" breast cancer with women with other types of breast cancer.
Experimental Design: We studied a cohort of 1,601 patients with breast cancer, diagnosed between January 1987 and December 1997 at Women's College Hospital in Toronto. Triple-negative breast cancers were defined as those that were estrogen receptor negative, progesterone receptor negative, and HER2neu negative. The prognostic significance of triple-negative breast cancer was explored.
Results: The median follow-up time of the 1,601 women was 8.1 years. One hundred and eighty of 1,601 patients (11.2%) had triple-negative breast cancer. Compared with other women with breast cancer, those with triple-negative breast cancer had an increased likelihood of distant recurrence (hazard ratio, 2.6; 95% confidence interval, 2.0-3.5; P < 0.0001) and death (hazard ratio, 3.2; 95% confidence interval, 2.3-4.5; P < 0.001) within 5 years of diagnosis but not thereafter. The pattern of recurrence was also qualitatively different; among the triple-negative group, the risk of distant recurrence peaked at 
3 years and declined rapidly thereafter. Among the "other" group, the recurrence risk seemed to be constant over the period of follow-up.
Conclusions: Triple-negative breast cancers have a more aggressive clinical course than other forms of breast cancer, but the adverse effect is transient.
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