The 5-year event-free survival EFS) rate was 81.3% with neoadjuvant pembrolizumab/chemotherapy followed by adjuvant pembrolizumab compared with 72.3% in those who received placebo/chemotherapy plus placebo.
Neoadjuvant pembrolizumab combined with chemotherapy followed by adjuvant pembrolizumab compared with placebo plus chemotherapy continued to show a clinically meaningful improvement in event-free survival in patients with high-risk, early-stage triple-negative breast cancer.
The addition of pembrolizumab to neoadjuvant chemotherapy followed by adjuvant pembrolizumab plus endocrine therapy improved pathologic complete responses in key subsets of patients with early-stage, high-risk, estrogen receptor–positive/HER2-negative breast cancer enrolled in the phase 3 KEYNOTE-756 trial.
Neoadjuvant pembrolizumab plus chemotherapy followed by adjuvant pembrolizumab plus endocrine therapy generated a statistically significant increase in pathologic complete response vs neoadjuvant placebo plus chemotherapy followed by adjuvant pembrolizumab and endocrine therapy in patients with high-risk, early-stage, estrogen receptor–positive, HER2-negative breast cancer.