Pembrolizumab was also tested as a neoadjuvant therapy for locally advanced TNBC in the phase Ib KEYNOTE-173 study. There is also evidence supporting its use for Triple Negative Breast Cancer. The pembrolizumab along with chemotherapy offered better progression-free survival than chemotherapy alone as the first treatment for metastatic triple-negative breast cancer or recurrent triple-negative breast cancer. Keytruda and specificity for triple-negative cancer.
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M. Myashita et al, Review Article on Neoadjuvant/adjuvant Treatment for Early Breast Cancer CCO Vol 9, No 3 (June 2020)
Schmid P, Park YH, Muñoz-Couselo E, et al. Pembrolizumab 1 chemotherapy as neoadjuvant treatment for triple negative breast cancer (TNBC): preliminary results from KEYNOTE-173. J Clin Oncol 2017;35:556