a strong trendP = 0.08
Letrozole also demonstrated a strong trend, despite the crossover, for improved OS (303 letrozole vs. 343 tamoxifen events; HR = 0.87; 95% CI, 0.75–1.02; P = 0.08).
Letrozole also demonstrated a strong trend, despite the crossover, for improved OS (303 letrozole vs. 343 tamoxifen events; HR = 0.87; 95% CI, 0.75–1.02; P = 0.08).
OS did not reach statistical significance at this early follow-up (HR = 0.86; P = 0.16; 166 letrozole vs. 192 tamoxifen events; Table 1 ) [ 11 ].
The highly significant DFS, DDFS, and OS benefit led to unblinding of the trial approximately 1 year earlier than planned, when 66% of patients receiving placebo chose to switch to letrozole, while 34% elected no further treatment [ 62 ].