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The patient achieved a partial response, and the progression-free survival (PFS) was more than 21 months. Case 2 involved a patient with breast cancer with multiple bone metastases. After failure of combined radiotherapy and chemotherapy, the patient received tamoxifen combined with pembrolizumab based on the patient's preference and clinical biomarkers of a positive differentiation cluster of eight tumor-infiltrating lymphocytes and a high TCR repertoire (high Shannon index and clonality) in the tumor. The patient's bone pain and biomar