Preoperative radiation improved T-cell infiltration (TCI) in patients with hormone receptor (HR)-positive, HER2-negative breast cancer when administered in combination with pembrolizumab (Keytruda) and chemotherapy and led to improved treatment responses prior to surgery, according to the results of the phase II P-RAD clinical trial presented at the San Antonio Breast Cancer Symposium (SABCS), held December 9-12, 2025.
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