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http://dx.doi.org/10.1056/NEJMc2416491 | DOI Listing |
N Engl J Med
March 2025
Natera, San Carlos, CA.
N Engl J Med
March 2025
KU Leuven, Leuven, Belgium.
Breast Cancer Res
March 2025
Centre for Experimental Cancer Medicine, Barts Cancer Institute, London, UK.
Background: The multicohort, open-label, phase 1b KEYNOTE-173 study was conducted to investigate pembrolizumab plus chemotherapy as neoadjuvant therapy for triple-negative breast cancer (TNBC). This exploratory analysis evaluated features of the tumor microenvironment that might be predictive of response.
Methods: Cell fractions from 20 paired samples collected at baseline and after one cycle of neoadjuvant pembrolizumab prior to chemotherapy initiation were analyzed by spatial localization (tumor compartment, stromal compartment, or sum of tumor and stromal compartments [total tumor]) using three six-plex immunohistochemistry panels with T-cell, myeloid cell, and natural killer cell components.
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