Figure 1.

 Patient disposition (completion or discontinuation). ^aThe date of surgery was used to define the end of the neoadjuvant period, as detailed in the statistical analysis plan. ^bTwelve patients who received randomized tamoxifen before unblinding opted to switch to receive open‐label anastrozole. No patients who received randomized anastrozole before unblinding opted to switch to receive open‐label tamoxifen.