Journal article

Patterns of recurrence of early breast cancer according to estrogen receptor status: a therapeutic target for a quarter of a century

Olivia Pagani, Karen N Price, Richard D Gelber, Monica Castiglione-Gertsch, Stig B Holmberg, Jurij Lindtner, Beat Thuerlimann, John Collins, Martin F Fey, Alan S Coates, Aron Goldhirsch



The current therapeutic strategy in breast cancer is to identify a target, such as estrogen receptor (ER) status, for tailoring treatments. We investigated the patterns of recurrence with respect to ER status for patients treated in two randomized trials with 25 years' median follow-up. In the ER-negative subpopulations most breast cancer events occurred within the first 5-7 years after randomization, while in the ER-positive subpopulations breast cancer events were spread through 10 years. In the ER-positive subpopulation, 1 year endocrine treatment alone significantly prolonged disease-free survival (DFS) with no additional benefit observed by adding 1 year of chemotherapy. In the small ER..

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Awarded by US-National Cancer Institute

Funding Acknowledgements

We thank the patients, physicians, nurses, and data managers who participate in the International Breast Cancer Study Group trials. We thank Rita Hinkle for data management and IBCSG patients and participants who have submitted yearly trial patient data for 30 years: West Swedish Breast Cancer Group; Institute of Oncology, Ljubljana, Slovenia; Swiss Group for Clinical Cancer Research (SAKK); Australian New Zealand Breast Cancer Trials Group (ANZ BCTG); Groote Shuur Hospital, Cape Town, South Africa. Funding (in addition to above) provided by: Ludwig Institute for Cancer Research, Swedish Cancer Society, The Cancer Council Australia, National Health Medical Research Council of Australia, Frontier Science and Technology Research Foundation, US-National Cancer Institute (CA-75362), Cancer Association of South Africa (CANSA), and Foundation of Clinical Cancer Research of Eastern Switzerland (OSKK).