This summary table contains detailed information about research studies. Summary tables offer an informative look at the science behind many breast cancer guidelines and recommendations. However, they should be viewed with some caution. In order to read and interpret research tables successfully, it is important to understand some key concepts. Learn how to read a research table.
Introduction: Chemotherapy after breast surgery (adjuvant chemotherapy) improves survival in women with breast cancer.
A pooled analysis of data from 60 randomized clinical trials (that together included 28,764 women) showed women of all ages and different types of breast cancer can benefit from adjuvant chemotherapy. Women younger than 50 showed the most improvement in 15-year overall survival.
The benefit of adjuvant chemotherapy depends on a person’s prognosis. People with the poorest prognosis get the most survival improvement, while those with the best prognosis get the smallest benefit.
Learn more about chemotherapy.
Learn about the strengths and weaknesses of different types of studies.
Study selection criteria: Early Breast Cancer Trialists' Collaborative pooled analysis.
Early Breast Cancer Trialists' Collaborative GroupPooled Analysis
Age and Prognosis
15-Year Overall Survival
Absolute Improvement in Survival with Chemotherapy
By age at diagnosis
Younger than 40
70 or older
Among women younger than 50 at diagnosis
Among women 50-69 at diagnosis
1. Early Breast Cancer Trialists' Collaborative Group. Effects of chemotherapy and hormonal therapy for early breast cancer on recurrence and 15-year survival: an overview of the randomised trials. Lancet. 365(9472):1687-717, 2005.
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