Figure 3.

Kaplan-Meier disease-free interval (DFI) curves among HER2-negative white women by estrogen receptor (ER) category in Carolina Breast Cancer Study phase III. Included ER-positive case patients who received endocrine therapy (ET) and ER-negative case patients who did not receive ET. Pairwise two-sided log-rank tests were performed with Bonferroni correction for multiple comparisons. ER-negative and ER-positive case patients had statistically significantly different DFI (P < .001). All other pairwise comparisons were not statistically significant.