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Proportion recurrence-free, by year of surgery, (a) for 6 treatment periods, (b) for 2 treatment periods, (c) for breast-conserving surgery alone over 2 treatment periods, (d) for breast-conserving surgery with radiation over 2 treatment periods.
†p-value for difference compared to 1978–1990
‡p-value for difference compared to 1978–1998
HR, hazard ratio
