Figure 1. Cumulative Risk of Mastectomy.
(a) All patients who would be eligible for CALGB 9343; (b) patients with clinical N0 disease; (c) patients with pathologic N0 disease. Error bars represent the 95% confidence intervals for risk of mastectomy at 5 and 10 years. P-value is from the log-rank test. Abbreviations: RT, Radiation therapy.