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Subgroup analysis of disease-free survival according to estrogen-receptor (ER) status of isolated locoregional recurrence (ILRR) and ER status of primary breast cancer tissue among 143 patients with known primary ER status. The size of the boxes is proportional to the number of events. The x-axis is on a log scale. CT, assigned to chemotherapy; no CT, not assigned to chemotherapy. (*) 143 of the 162 randomly assigned patients.
